diff --git a/.php_cs.dist b/.php_cs.dist
index c0011033990d..a531438b1e97 100644
--- a/.php_cs.dist
+++ b/.php_cs.dist
@@ -11,7 +11,10 @@ return PhpCsFixer\Config::create()
         '@PHPUnit48Migration:risky' => true,
         'php_unit_no_expectation_annotation' => false, // part of `PHPUnitXYMigration:risky` ruleset, to be enabled when PHPUnit 4.x support will be dropped, as we don't want to rewrite exceptions handling twice
         'array_syntax' => array('syntax' => 'long'),
+        'ordered_imports' => true,
         'protected_to_private' => false,
+        // Part of @Symfony:risky in PHP-CS-Fixer 2.13.0. To be removed from the config file once upgrading
+        'native_function_invocation' => array('include' => array('@compiler_optimized'), 'scope' => 'namespaced'),
     ))
     ->setRiskyAllowed(true)
     ->setFinder(
@@ -24,12 +27,17 @@ return PhpCsFixer\Config::create()
                 'Symfony/Component/Routing/Tests/Fixtures/dumper',
                 // fixture templates
                 'Symfony/Component/Templating/Tests/Fixtures/templates',
+                'Symfony/Bundle/FrameworkBundle/Tests/Fixtures/TemplatePathsCache',
                 'Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/Resources/Custom',
                 // generated fixtures
                 'Symfony/Component/VarDumper/Tests/Fixtures',
                 // resource templates
                 'Symfony/Bundle/FrameworkBundle/Resources/views/Form',
+                // explicit trigger_error tests
+                'Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/',
             ))
+            // Support for older PHPunit version
+            ->notPath('Symfony/Bridge/PhpUnit/SymfonyTestsListener.php')
             // file content autogenerated by `var_export`
             ->notPath('Symfony/Component/Translation/Tests/fixtures/resources.php')
             // test template
@@ -37,8 +45,6 @@ return PhpCsFixer\Config::create()
             // explicit heredoc test
             ->notPath('Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/views/translation.html.php')
             // explicit trigger_error tests
-            ->notPath('Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/default.phpt')
-            ->notPath('Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/weak.phpt')
             ->notPath('Symfony/Component/Debug/Tests/DebugClassLoaderTest.php')
     )
 ;
diff --git a/CHANGELOG-4.0.md b/CHANGELOG-4.0.md
index 2afe811abce7..cba2e57482bb 100644
--- a/CHANGELOG-4.0.md
+++ b/CHANGELOG-4.0.md
@@ -7,6 +7,16 @@ in 4.0 minor versions.
 To get the diff for a specific change, go to https://github.com/symfony/symfony/commit/XXX where XXX is the change hash
 To get the diff between two versions, go to https://github.com/symfony/symfony/compare/v4.0.0...v4.0.1
 
+* 4.0.14 (2018-08-01)
+
+ * security #cve-2018-14774 [HttpKernel] fix trusted headers management in HttpCache and InlineFragmentRenderer (nicolas-grekas)
+ * security #cve-2018-14773 [HttpFoundation] Remove support for legacy and risky HTTP headers (nicolas-grekas)
+ * bug #28003 [HttpKernel] Fixes invalid REMOTE_ADDR in inline subrequest when configuring trusted proxy with subnet (netiul)
+ * bug #28007 [FrameworkBundle] fixed guard event names for transitions (destillat)
+ * bug #28045 [HttpFoundation] Fix Cookie::isCleared (ro0NL)
+ * bug #28080 [HttpFoundation] fixed using _method parameter with invalid type (Phobetor)
+ * bug #28052 [HttpKernel] Fix merging bindings for controllers' locators (nicolas-grekas)
+
 * 4.0.13 (2018-07-23)
 
  * bug #28005 [HttpKernel] Fixed templateExists on parse error of the template name (yceruto)
diff --git a/src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php b/src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php
index 9ba6912e0fae..20aaae85a1e4 100644
--- a/src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php
+++ b/src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php
@@ -54,7 +54,7 @@ public function dispatchEvent($eventName, EventArgs $eventArgs = null)
             $initialized = isset($this->initialized[$eventName]);
 
             foreach ($this->listeners[$eventName] as $hash => $listener) {
-                if (!$initialized && is_string($listener)) {
+                if (!$initialized && \is_string($listener)) {
                     $this->listeners[$eventName][$hash] = $listener = $this->container->get($listener);
                 }
 
@@ -98,7 +98,7 @@ public function hasListeners($event)
      */
     public function addEventListener($events, $listener)
     {
-        if (is_string($listener)) {
+        if (\is_string($listener)) {
             if ($this->initialized) {
                 throw new \RuntimeException('Adding lazy-loading listeners after construction is not supported.');
             }
@@ -124,7 +124,7 @@ public function addEventListener($events, $listener)
      */
     public function removeEventListener($events, $listener)
     {
-        if (is_string($listener)) {
+        if (\is_string($listener)) {
             $hash = '_service_'.$listener;
         } else {
             // Picks the hash code related to that listener
diff --git a/src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php b/src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php
index e605c057e353..51577de0f5b2 100644
--- a/src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php
+++ b/src/Symfony/Bridge/Doctrine/DataCollector/DoctrineDataCollector.php
@@ -14,9 +14,9 @@
 use Doctrine\Common\Persistence\ManagerRegistry;
 use Doctrine\DBAL\Logging\DebugStack;
 use Doctrine\DBAL\Types\Type;
-use Symfony\Component\HttpKernel\DataCollector\DataCollector;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\DataCollector;
 
 /**
  * DoctrineDataCollector.
@@ -134,14 +134,14 @@ private function sanitizeQuery($connectionName, $query)
         if (null === $query['params']) {
             $query['params'] = array();
         }
-        if (!is_array($query['params'])) {
+        if (!\is_array($query['params'])) {
             $query['params'] = array($query['params']);
         }
         foreach ($query['params'] as $j => $param) {
             if (isset($query['types'][$j])) {
                 // Transform the param according to the type
                 $type = $query['types'][$j];
-                if (is_string($type)) {
+                if (\is_string($type)) {
                     $type = Type::getType($type);
                 }
                 if ($type instanceof Type) {
@@ -168,15 +168,15 @@ private function sanitizeQuery($connectionName, $query)
      */
     private function sanitizeParam($var): array
     {
-        if (is_object($var)) {
-            $className = get_class($var);
+        if (\is_object($var)) {
+            $className = \get_class($var);
 
             return method_exists($var, '__toString') ?
                 array(sprintf('Object(%s): "%s"', $className, $var->__toString()), false) :
                 array(sprintf('Object(%s)', $className), false);
         }
 
-        if (is_array($var)) {
+        if (\is_array($var)) {
             $a = array();
             $original = true;
             foreach ($var as $k => $v) {
@@ -188,7 +188,7 @@ private function sanitizeParam($var): array
             return array($a, $original);
         }
 
-        if (is_resource($var)) {
+        if (\is_resource($var)) {
             return array(sprintf('Resource(%s)', get_resource_type($var)), false);
         }
 
diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
index 2850ab47cd3e..b8064e435f04 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\DependencyInjection;
 
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 /**
  * This abstract classes groups common code that Doctrine Object Manager extensions (ORM, MongoDB, CouchDB) need.
@@ -141,7 +141,7 @@ protected function setMappingDriverConfig(array $mappingConfig, $mappingName)
      */
     protected function getMappingDriverBundleConfigDefaults(array $bundleConfig, \ReflectionClass $bundle, ContainerBuilder $container)
     {
-        $bundleDir = dirname($bundle->getFileName());
+        $bundleDir = \dirname($bundle->getFileName());
 
         if (!$bundleConfig['type']) {
             $bundleConfig['type'] = $this->detectMetadataDriver($bundleDir, $container);
@@ -153,7 +153,7 @@ protected function getMappingDriverBundleConfigDefaults(array $bundleConfig, \Re
         }
 
         if (!$bundleConfig['dir']) {
-            if (in_array($bundleConfig['type'], array('annotation', 'staticphp'))) {
+            if (\in_array($bundleConfig['type'], array('annotation', 'staticphp'))) {
                 $bundleConfig['dir'] = $bundleDir.'/'.$this->getMappingObjectDefaultName();
             } else {
                 $bundleConfig['dir'] = $bundleDir.'/'.$this->getMappingResourceConfigDirectory();
@@ -240,7 +240,7 @@ protected function assertValidMappingConfiguration(array $mappingConfig, $object
             throw new \InvalidArgumentException(sprintf('Specified non-existing directory "%s" as Doctrine mapping source.', $mappingConfig['dir']));
         }
 
-        if (!in_array($mappingConfig['type'], array('xml', 'yml', 'annotation', 'php', 'staticphp'))) {
+        if (!\in_array($mappingConfig['type'], array('xml', 'yml', 'annotation', 'php', 'staticphp'))) {
             throw new \InvalidArgumentException(sprintf('Can only configure "xml", "yml", "annotation", "php" or '.
                 '"staticphp" through the DoctrineBundle. Use your own bundle to configure other metadata drivers. '.
                 'You can register them by adding a new driver to the '.
@@ -272,7 +272,7 @@ protected function detectMetadataDriver($dir, ContainerBuilder $container)
             // add the closest existing directory as a resource
             $resource = $dir.'/'.$configPath;
             while (!is_dir($resource)) {
-                $resource = dirname($resource);
+                $resource = \dirname($resource);
             }
             $container->fileExists($resource, false);
 
diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/DoctrineValidationPass.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/DoctrineValidationPass.php
index 5f74ecfbcc5a..b0db71c92936 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/DoctrineValidationPass.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/DoctrineValidationPass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\DependencyInjection\CompilerPass;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * Registers additional validators.
@@ -52,7 +52,7 @@ private function updateValidatorMappingFiles(ContainerBuilder $container, string
 
         foreach ($container->getParameter('kernel.bundles') as $bundle) {
             $reflection = new \ReflectionClass($bundle);
-            if ($container->fileExists($file = dirname($reflection->getFileName()).'/'.$validationPath)) {
+            if ($container->fileExists($file = \dirname($reflection->getFileName()).'/'.$validationPath)) {
                 $files[] = $file;
             }
         }
diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php
index d856b2c8db79..92a7b673e27d 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php
@@ -141,7 +141,7 @@ private function findAndSortTags($tagName, ContainerBuilder $container)
 
         if ($sortedTags) {
             krsort($sortedTags);
-            $sortedTags = call_user_func_array('array_merge', $sortedTags);
+            $sortedTags = \call_user_func_array('array_merge', $sortedTags);
         }
 
         return $sortedTags;
diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterMappingsPass.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterMappingsPass.php
index 4f140f81edd0..44ad1562196b 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterMappingsPass.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/CompilerPass/RegisterMappingsPass.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\DependencyInjection\CompilerPass;
 
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Base class for the doctrine bundles to provide a compiler pass class that
@@ -124,7 +124,7 @@ public function __construct($driver, array $namespaces, array $managerParameters
         $this->managerParameters = $managerParameters;
         $this->driverPattern = $driverPattern;
         $this->enabledParameter = $enabledParameter;
-        if (count($aliasMap) && (!$configurationPattern || !$registerAliasMethodName)) {
+        if (\count($aliasMap) && (!$configurationPattern || !$registerAliasMethodName)) {
             throw new \InvalidArgumentException('configurationPattern and registerAliasMethodName are required to register namespace alias');
         }
         $this->configurationPattern = $configurationPattern;
@@ -149,7 +149,7 @@ public function process(ContainerBuilder $container)
             $chainDriverDef->addMethodCall('addDriver', array($mappingDriverDef, $namespace));
         }
 
-        if (!count($this->aliasMap)) {
+        if (!\count($this->aliasMap)) {
             return;
         }
 
diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/Security/UserProvider/EntityFactory.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/Security/UserProvider/EntityFactory.php
index 1f946266a095..352bf79bfbc7 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/Security/UserProvider/EntityFactory.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/Security/UserProvider/EntityFactory.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\DependencyInjection\Security\UserProvider;
 
-use Symfony\Component\Config\Definition\Builder\NodeDefinition;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\UserProvider\UserProviderFactoryInterface;
+use Symfony\Component\Config\Definition\Builder\NodeDefinition;
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
diff --git a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
index a5a08b13ea42..7df0c37a4ecd 100644
--- a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
+++ b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
@@ -83,7 +83,7 @@ public function loadValuesForChoices(array $choices, $value = null)
 
         // Optimize performance for single-field identifiers. We already
         // know that the IDs are used as values
-        $optimize = null === $value || is_array($value) && $value[0] === $this->idReader;
+        $optimize = null === $value || \is_array($value) && $value[0] === $this->idReader;
 
         // Attention: This optimization does not check choices for existence
         if ($optimize && !$this->choiceList && $this->idReader->isSingleId()) {
@@ -120,7 +120,7 @@ public function loadChoicesForValues(array $values, $value = null)
 
         // Optimize performance in case we have an object loader and
         // a single-field identifier
-        $optimize = null === $value || is_array($value) && $this->idReader === $value[0];
+        $optimize = null === $value || \is_array($value) && $this->idReader === $value[0];
 
         if ($optimize && !$this->choiceList && $this->objectLoader && $this->idReader->isSingleId()) {
             $unorderedObjects = $this->objectLoader->getEntitiesByIds($this->idReader->getIdField(), $values);
diff --git a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/IdReader.php b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/IdReader.php
index 3f3a5c8ac40f..381d02fcbe04 100644
--- a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/IdReader.php
+++ b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/IdReader.php
@@ -42,8 +42,8 @@ public function __construct(ObjectManager $om, ClassMetadata $classMetadata)
 
         $this->om = $om;
         $this->classMetadata = $classMetadata;
-        $this->singleId = 1 === count($ids);
-        $this->intId = $this->singleId && in_array($idType, array('integer', 'smallint', 'bigint'));
+        $this->singleId = 1 === \count($ids);
+        $this->intId = $this->singleId && \in_array($idType, array('integer', 'smallint', 'bigint'));
         $this->idField = current($ids);
 
         // single field association are resolved, since the schema column could be an int
@@ -95,7 +95,7 @@ public function getIdValue($object)
         }
 
         if (!$this->om->contains($object)) {
-            throw new RuntimeException(sprintf('Entity of type "%s" passed to the choice field must be managed. Maybe you forget to persist it in the entity manager?', get_class($object)));
+            throw new RuntimeException(sprintf('Entity of type "%s" passed to the choice field must be managed. Maybe you forget to persist it in the entity manager?', \get_class($object)));
         }
 
         $this->om->initializeObject($object);
diff --git a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php
index 540fd0e03116..a2f1fa7ae8b7 100644
--- a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php
+++ b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bridge\Doctrine\Form\ChoiceList;
 
-use Doctrine\ORM\QueryBuilder;
 use Doctrine\DBAL\Connection;
+use Doctrine\ORM\QueryBuilder;
 
 /**
  * Loads entities using a {@link QueryBuilder} instance.
@@ -64,7 +64,7 @@ public function getEntitiesByIds($identifier, array $values)
         // Guess type
         $entity = current($qb->getRootEntities());
         $metadata = $qb->getEntityManager()->getClassMetadata($entity);
-        if (in_array($metadata->getTypeOfField($identifier), array('integer', 'bigint', 'smallint'))) {
+        if (\in_array($metadata->getTypeOfField($identifier), array('integer', 'bigint', 'smallint'))) {
             $parameterType = Connection::PARAM_INT_ARRAY;
 
             // Filter out non-integer values (e.g. ""). If we don't, some
@@ -72,7 +72,7 @@ public function getEntitiesByIds($identifier, array $values)
             $values = array_values(array_filter($values, function ($v) {
                 return (string) $v === (string) (int) $v || ctype_digit($v);
             }));
-        } elseif (in_array($metadata->getTypeOfField($identifier), array('uuid', 'guid'))) {
+        } elseif (\in_array($metadata->getTypeOfField($identifier), array('uuid', 'guid'))) {
             $parameterType = Connection::PARAM_STR_ARRAY;
 
             // Like above, but we just filter out empty strings.
diff --git a/src/Symfony/Bridge/Doctrine/Form/DataTransformer/CollectionToArrayTransformer.php b/src/Symfony/Bridge/Doctrine/Form/DataTransformer/CollectionToArrayTransformer.php
index 307361a52a3e..4010512ba9c4 100644
--- a/src/Symfony/Bridge/Doctrine/Form/DataTransformer/CollectionToArrayTransformer.php
+++ b/src/Symfony/Bridge/Doctrine/Form/DataTransformer/CollectionToArrayTransformer.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Bridge\Doctrine\Form\DataTransformer;
 
-use Symfony\Component\Form\Exception\TransformationFailedException;
-use Symfony\Component\Form\DataTransformerInterface;
-use Doctrine\Common\Collections\Collection;
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\TransformationFailedException;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -36,7 +36,7 @@ public function transform($collection)
 
         // For cases when the collection getter returns $collection->toArray()
         // in order to prevent modifications of the returned collection
-        if (is_array($collection)) {
+        if (\is_array($collection)) {
             return $collection;
         }
 
diff --git a/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php b/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php
index 3d6fe3364f94..8b49f0662134 100644
--- a/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php
+++ b/src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php
@@ -13,6 +13,7 @@
 
 use Doctrine\Common\Persistence\ManagerRegistry;
 use Doctrine\Common\Persistence\Mapping\MappingException;
+use Doctrine\Common\Util\ClassUtils;
 use Doctrine\DBAL\Types\Type;
 use Doctrine\ORM\Mapping\ClassMetadataInfo;
 use Doctrine\ORM\Mapping\MappingException as LegacyMappingException;
@@ -20,7 +21,6 @@
 use Symfony\Component\Form\Guess\Guess;
 use Symfony\Component\Form\Guess\TypeGuess;
 use Symfony\Component\Form\Guess\ValueGuess;
-use Doctrine\Common\Util\ClassUtils;
 
 class DoctrineOrmTypeGuesser implements FormTypeGuesserInterface
 {
@@ -133,7 +133,7 @@ public function guessMaxLength($class, $property)
                 return new ValueGuess($mapping['length'], Guess::HIGH_CONFIDENCE);
             }
 
-            if (in_array($ret[0]->getTypeOfField($property), array(Type::DECIMAL, Type::FLOAT))) {
+            if (\in_array($ret[0]->getTypeOfField($property), array(Type::DECIMAL, Type::FLOAT))) {
                 return new ValueGuess(null, Guess::MEDIUM_CONFIDENCE);
             }
         }
@@ -146,7 +146,7 @@ public function guessPattern($class, $property)
     {
         $ret = $this->getMetadata($class);
         if ($ret && isset($ret[0]->fieldMappings[$property]) && !$ret[0]->hasAssociation($property)) {
-            if (in_array($ret[0]->getTypeOfField($property), array(Type::DECIMAL, Type::FLOAT))) {
+            if (\in_array($ret[0]->getTypeOfField($property), array(Type::DECIMAL, Type::FLOAT))) {
                 return new ValueGuess(null, Guess::MEDIUM_CONFIDENCE);
             }
         }
diff --git a/src/Symfony/Bridge/Doctrine/Form/EventListener/MergeDoctrineCollectionListener.php b/src/Symfony/Bridge/Doctrine/Form/EventListener/MergeDoctrineCollectionListener.php
index 487523dd5dfe..22517181f759 100644
--- a/src/Symfony/Bridge/Doctrine/Form/EventListener/MergeDoctrineCollectionListener.php
+++ b/src/Symfony/Bridge/Doctrine/Form/EventListener/MergeDoctrineCollectionListener.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bridge\Doctrine\Form\EventListener;
 
 use Doctrine\Common\Collections\Collection;
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 
 /**
  * Merge changes from the request to a Doctrine\Common\Collections\Collection instance.
@@ -45,7 +45,7 @@ public function onSubmit(FormEvent $event)
 
         // If all items were removed, call clear which has a higher
         // performance on persistent collections
-        if ($collection instanceof Collection && 0 === count($data)) {
+        if ($collection instanceof Collection && 0 === \count($data)) {
             $collection->clear();
         }
     }
diff --git a/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php b/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
index 25b0aefecfe8..59cdc3b418eb 100644
--- a/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
+++ b/src/Symfony/Bridge/Doctrine/Form/Type/DoctrineType.php
@@ -215,8 +215,8 @@ public function configureOptions(OptionsResolver $resolver)
         // Invoke the query builder closure so that we can cache choice lists
         // for equal query builders
         $queryBuilderNormalizer = function (Options $options, $queryBuilder) {
-            if (is_callable($queryBuilder)) {
-                $queryBuilder = call_user_func($queryBuilder, $options['em']->getRepository($options['class']));
+            if (\is_callable($queryBuilder)) {
+                $queryBuilder = \call_user_func($queryBuilder, $options['em']->getRepository($options['class']));
             }
 
             return $queryBuilder;
diff --git a/src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php b/src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php
index 4b07e83652c6..fa4176ee18f3 100644
--- a/src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php
+++ b/src/Symfony/Bridge/Doctrine/Form/Type/EntityType.php
@@ -28,8 +28,8 @@ public function configureOptions(OptionsResolver $resolver)
         // Invoke the query builder closure so that we can cache choice lists
         // for equal query builders
         $queryBuilderNormalizer = function (Options $options, $queryBuilder) {
-            if (is_callable($queryBuilder)) {
-                $queryBuilder = call_user_func($queryBuilder, $options['em']->getRepository($options['class']));
+            if (\is_callable($queryBuilder)) {
+                $queryBuilder = \call_user_func($queryBuilder, $options['em']->getRepository($options['class']));
 
                 if (null !== $queryBuilder && !$queryBuilder instanceof QueryBuilder) {
                     throw new UnexpectedTypeException($queryBuilder, 'Doctrine\ORM\QueryBuilder');
diff --git a/src/Symfony/Bridge/Doctrine/Logger/DbalLogger.php b/src/Symfony/Bridge/Doctrine/Logger/DbalLogger.php
index 42574edcade5..0200c2657a0e 100644
--- a/src/Symfony/Bridge/Doctrine/Logger/DbalLogger.php
+++ b/src/Symfony/Bridge/Doctrine/Logger/DbalLogger.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Logger;
 
+use Doctrine\DBAL\Logging\SQLLogger;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\Stopwatch\Stopwatch;
-use Doctrine\DBAL\Logging\SQLLogger;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
@@ -71,12 +71,12 @@ private function normalizeParams(array $params)
     {
         foreach ($params as $index => $param) {
             // normalize recursively
-            if (is_array($param)) {
+            if (\is_array($param)) {
                 $params[$index] = $this->normalizeParams($param);
                 continue;
             }
 
-            if (!is_string($params[$index])) {
+            if (!\is_string($params[$index])) {
                 continue;
             }
 
diff --git a/src/Symfony/Bridge/Doctrine/ManagerRegistry.php b/src/Symfony/Bridge/Doctrine/ManagerRegistry.php
index c019c31a9ac0..bf73c0036d03 100644
--- a/src/Symfony/Bridge/Doctrine/ManagerRegistry.php
+++ b/src/Symfony/Bridge/Doctrine/ManagerRegistry.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine;
 
+use Doctrine\Common\Persistence\AbstractManagerRegistry;
 use ProxyManager\Proxy\LazyLoadingInterface;
 use Symfony\Component\DependencyInjection\Container;
-use Doctrine\Common\Persistence\AbstractManagerRegistry;
 
 /**
  * References Doctrine connections and entity/document managers.
diff --git a/src/Symfony/Bridge/Doctrine/Security/RememberMe/DoctrineTokenProvider.php b/src/Symfony/Bridge/Doctrine/Security/RememberMe/DoctrineTokenProvider.php
index f35984068f93..e0dcaae6c2f6 100644
--- a/src/Symfony/Bridge/Doctrine/Security/RememberMe/DoctrineTokenProvider.php
+++ b/src/Symfony/Bridge/Doctrine/Security/RememberMe/DoctrineTokenProvider.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Bridge\Doctrine\Security\RememberMe;
 
-use Symfony\Component\Security\Core\Authentication\RememberMe\TokenProviderInterface;
-use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentTokenInterface;
-use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentToken;
-use Symfony\Component\Security\Core\Exception\TokenNotFoundException;
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\Types\Type as DoctrineType;
+use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentToken;
+use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentTokenInterface;
+use Symfony\Component\Security\Core\Authentication\RememberMe\TokenProviderInterface;
+use Symfony\Component\Security\Core\Exception\TokenNotFoundException;
 
 /**
  * This class provides storage for the tokens that is set in "remember me"
diff --git a/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php b/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
index ea2793d471e3..726548e1744e 100644
--- a/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
+++ b/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
@@ -14,8 +14,8 @@
 use Doctrine\Common\Persistence\ManagerRegistry;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
-use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Security\Core\User\UserProviderInterface;
 
 /**
  * Wrapper around a Doctrine ObjectManager.
@@ -51,7 +51,7 @@ public function loadUserByUsername($username)
             $user = $repository->findOneBy(array($this->property => $username));
         } else {
             if (!$repository instanceof UserLoaderInterface) {
-                throw new \InvalidArgumentException(sprintf('You must either make the "%s" entity Doctrine Repository ("%s") implement "Symfony\Bridge\Doctrine\Security\User\UserLoaderInterface" or set the "property" option in the corresponding entity provider configuration.', $this->classOrAlias, get_class($repository)));
+                throw new \InvalidArgumentException(sprintf('You must either make the "%s" entity Doctrine Repository ("%s") implement "Symfony\Bridge\Doctrine\Security\User\UserLoaderInterface" or set the "property" option in the corresponding entity provider configuration.', $this->classOrAlias, \get_class($repository)));
             }
 
             $user = $repository->loadUserByUsername($username);
@@ -71,7 +71,7 @@ public function refreshUser(UserInterface $user)
     {
         $class = $this->getClass();
         if (!$user instanceof $class) {
-            throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', get_class($user)));
+            throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', \get_class($user)));
         }
 
         $repository = $this->getRepository();
diff --git a/src/Symfony/Bridge/Doctrine/Test/DoctrineTestHelper.php b/src/Symfony/Bridge/Doctrine/Test/DoctrineTestHelper.php
index ee1e36859ed1..06dc628475e9 100644
--- a/src/Symfony/Bridge/Doctrine/Test/DoctrineTestHelper.php
+++ b/src/Symfony/Bridge/Doctrine/Test/DoctrineTestHelper.php
@@ -14,8 +14,8 @@
 use Doctrine\Common\Annotations\AnnotationReader;
 use Doctrine\Common\Cache\ArrayCache;
 use Doctrine\ORM\Configuration;
-use Doctrine\ORM\Mapping\Driver\AnnotationDriver;
 use Doctrine\ORM\EntityManager;
+use Doctrine\ORM\Mapping\Driver\AnnotationDriver;
 use PHPUnit\Framework\TestCase;
 
 /**
@@ -34,7 +34,7 @@ class DoctrineTestHelper
      */
     public static function createTestEntityManager(Configuration $config = null)
     {
-        if (!extension_loaded('pdo_sqlite')) {
+        if (!\extension_loaded('pdo_sqlite')) {
             TestCase::markTestSkipped('Extension pdo_sqlite is required.');
         }
 
diff --git a/src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/CompilerPass/RegisterMappingsPassTest.php b/src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/CompilerPass/RegisterMappingsPassTest.php
index 692ee89e4bed..90dd1455921b 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/CompilerPass/RegisterMappingsPassTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/CompilerPass/RegisterMappingsPassTest.php
@@ -4,8 +4,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\DependencyInjection\CompilerPass\RegisterMappingsPass;
-use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
 
 class RegisterMappingsPassTest extends TestCase
 {
diff --git a/src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/DoctrineExtensionTest.php b/src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/DoctrineExtensionTest.php
index 9770e031a109..008cbd987d1e 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/DoctrineExtensionTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/DoctrineExtensionTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bridge\Doctrine\Tests\DependencyInjection;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 
 /**
@@ -68,7 +68,7 @@ public function testFixManagersAutoMappingsWithTwoAutomappings()
             'SecondBundle' => 'My\SecondBundle',
         );
 
-        $reflection = new \ReflectionClass(get_class($this->extension));
+        $reflection = new \ReflectionClass(\get_class($this->extension));
         $method = $reflection->getMethod('fixManagersAutoMappings');
         $method->setAccessible(true);
 
@@ -157,7 +157,7 @@ public function testFixManagersAutoMappings(array $originalEm1, array $originalE
             'SecondBundle' => 'My\SecondBundle',
         );
 
-        $reflection = new \ReflectionClass(get_class($this->extension));
+        $reflection = new \ReflectionClass(\get_class($this->extension));
         $method = $reflection->getMethod('fixManagersAutoMappings');
         $method->setAccessible(true);
 
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/CompositeIntIdEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/CompositeIntIdEntity.php
index 740a4f55f49c..8a9b00ddc73e 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/CompositeIntIdEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/CompositeIntIdEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class CompositeIntIdEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/CompositeStringIdEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/CompositeStringIdEntity.php
index 10e083a8f429..0755a89e6a92 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/CompositeStringIdEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/CompositeStringIdEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class CompositeStringIdEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/ContainerAwareFixture.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/ContainerAwareFixture.php
index 5141e1669c9f..6c3f880eaacf 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/ContainerAwareFixture.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/ContainerAwareFixture.php
@@ -13,8 +13,8 @@
 
 use Doctrine\Common\DataFixtures\FixtureInterface;
 use Doctrine\Common\Persistence\ObjectManager;
-use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 class ContainerAwareFixture implements FixtureInterface, ContainerAwareInterface
 {
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/DoubleNameEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/DoubleNameEntity.php
index cfb8e8b6664f..3559568787bc 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/DoubleNameEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/DoubleNameEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class DoubleNameEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/DoubleNullableNameEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/DoubleNullableNameEntity.php
index 29b247b9b1c3..20ef14fd1b57 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/DoubleNullableNameEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/DoubleNullableNameEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class DoubleNullableNameEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/GroupableEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/GroupableEntity.php
index 2e36204bdfda..730a9b2b1dbf 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/GroupableEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/GroupableEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class GroupableEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/GuidIdEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/GuidIdEntity.php
index 517f57495169..0d447ffc1e62 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/GuidIdEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/GuidIdEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class GuidIdEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/Person.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/Person.php
index 19a5d8b9569f..6e383394bee4 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/Person.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/Person.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
+use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\DiscriminatorColumn;
 use Doctrine\ORM\Mapping\DiscriminatorMap;
-use Doctrine\ORM\Mapping\Id;
-use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\InheritanceType;
 
 /**
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleAssociationToIntIdEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleAssociationToIntIdEntity.php
index 954de338d3ca..5cd6d407962a 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleAssociationToIntIdEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleAssociationToIntIdEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\OneToOne;
 
 /** @Entity */
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdEntity.php
index 6ee360e6a10a..d98b0ef93a60 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class SingleIntIdEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdNoToStringEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdNoToStringEntity.php
index bcbe7a5f7bde..c94815ca02ca 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdNoToStringEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdNoToStringEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class SingleIntIdNoToStringEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdStringWrapperNameEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdStringWrapperNameEntity.php
index d69d3de4b6f3..a06f4432a761 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdStringWrapperNameEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleIntIdStringWrapperNameEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\Type\StringWrapper;
 
 /** @Entity */
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleStringIdEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleStringIdEntity.php
index 258c5a65158e..3e25e2aea52b 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleStringIdEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleStringIdEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class SingleStringIdEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/User.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/User.php
index e59e32c27e82..c2ad425b61ea 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/User.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/User.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 use Symfony\Component\Security\Core\User\UserInterface;
 
 /** @Entity */
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/UuidIdEntity.php b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/UuidIdEntity.php
index 4998f7d7c545..46084ab292d4 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Fixtures/UuidIdEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Fixtures/UuidIdEntity.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Fixtures;
 
-use Doctrine\ORM\Mapping\Id;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
 
 /** @Entity */
 class UuidIdEntity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/ORMQueryBuilderLoaderTest.php b/src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/ORMQueryBuilderLoaderTest.php
index 22a421ccefbd..211cb12e4df2 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/ORMQueryBuilderLoaderTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Form/ChoiceList/ORMQueryBuilderLoaderTest.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Form\ChoiceList;
 
+use Doctrine\DBAL\Connection;
+use Doctrine\ORM\Version;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Doctrine\Form\ChoiceList\ORMQueryBuilderLoader;
 use Symfony\Bridge\Doctrine\Test\DoctrineTestHelper;
-use Doctrine\DBAL\Connection;
-use Doctrine\ORM\Version;
 
 class ORMQueryBuilderLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php b/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php
index ac96ea21c531..f4f7effa61c2 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Form\Type;
 
-use Symfony\Component\Form\Test\FormPerformanceTestCase;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
 use Doctrine\ORM\Tools\SchemaTool;
+use Symfony\Bridge\Doctrine\Form\DoctrineOrmExtension;
 use Symfony\Bridge\Doctrine\Test\DoctrineTestHelper;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
 use Symfony\Component\Form\Extension\Core\CoreExtension;
-use Symfony\Bridge\Doctrine\Form\DoctrineOrmExtension;
+use Symfony\Component\Form\Test\FormPerformanceTestCase;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -72,7 +72,7 @@ protected function setUp()
         $ids = range(1, 300);
 
         foreach ($ids as $id) {
-            $name = 65 + (int) chr($id % 57);
+            $name = 65 + (int) \chr($id % 57);
             $this->em->persist(new SingleIntIdEntity($id, $name));
         }
 
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php b/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php
index 021371439732..c0061dabc540 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php
@@ -23,7 +23,9 @@
 use Symfony\Bridge\Doctrine\Tests\Fixtures\CompositeIntIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\CompositeStringIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\GroupableEntity;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleAssociationToIntIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdNoToStringEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleStringCastableIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleStringIdEntity;
 use Symfony\Component\Form\ChoiceList\View\ChoiceGroupView;
@@ -31,8 +33,6 @@
 use Symfony\Component\Form\Forms;
 use Symfony\Component\Form\Tests\Extension\Core\Type\BaseTypeTest;
 use Symfony\Component\Form\Tests\Extension\Core\Type\FormTypeTest;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleAssociationToIntIdEntity;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdNoToStringEntity;
 
 class EntityTypeTest extends BaseTypeTest
 {
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Logger/DbalLoggerTest.php b/src/Symfony/Bridge/Doctrine/Tests/Logger/DbalLoggerTest.php
index 1e3e6ca6ec80..38bbed12945f 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Logger/DbalLoggerTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Logger/DbalLoggerTest.php
@@ -145,7 +145,7 @@ public function testLogUTF8LongString()
         ;
 
         $testStringArray = array('é', 'á', 'ű', 'ő', 'ú', 'ö', 'ü', 'ó', 'í');
-        $testStringCount = count($testStringArray);
+        $testStringCount = \count($testStringArray);
 
         $shortString = '';
         $longString = '';
diff --git a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
index f212ab25e6b8..dcb52718b117 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
@@ -30,7 +30,7 @@ class DoctrineExtractorTest extends TestCase
 
     protected function setUp()
     {
-        $config = Setup::createAnnotationMetadataConfiguration(array(__DIR__.DIRECTORY_SEPARATOR.'Fixtures'), true);
+        $config = Setup::createAnnotationMetadataConfiguration(array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures'), true);
         $entityManager = EntityManager::create(array('driver' => 'pdo_sqlite'), $config);
 
         if (!DBALType::hasType('foo')) {
diff --git a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
index 9517f6cc40d3..d02deb15bb7b 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
@@ -14,9 +14,9 @@
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
 use Doctrine\ORM\Mapping\Id;
-use Doctrine\ORM\Mapping\OneToMany;
 use Doctrine\ORM\Mapping\ManyToMany;
 use Doctrine\ORM\Mapping\ManyToOne;
+use Doctrine\ORM\Mapping\OneToMany;
 
 /**
  * @Entity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineFooType.php b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineFooType.php
index 394eaebdefc6..8d0a9381143d 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineFooType.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineFooType.php
@@ -50,7 +50,7 @@ public function convertToDatabaseValue($value, AbstractPlatform $platform)
             return;
         }
         if (!$value instanceof Foo) {
-            throw new ConversionException(sprintf('Expected %s, got %s', 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\Foo', gettype($value)));
+            throw new ConversionException(sprintf('Expected %s, got %s', 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\Foo', \gettype($value)));
         }
 
         return $foo->bar;
@@ -64,7 +64,7 @@ public function convertToPHPValue($value, AbstractPlatform $platform)
         if (null === $value) {
             return;
         }
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             throw ConversionException::conversionFailed($value, self::NAME);
         }
 
diff --git a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineWithEmbedded.php b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineWithEmbedded.php
index a1e011338f0b..aace866128b0 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineWithEmbedded.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineWithEmbedded.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures;
 
 use Doctrine\ORM\Mapping\Column;
+use Doctrine\ORM\Mapping\Embedded;
 use Doctrine\ORM\Mapping\Entity;
 use Doctrine\ORM\Mapping\Id;
-use Doctrine\ORM\Mapping\Embedded;
 
 /**
  * @Entity
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Security/User/EntityUserProviderTest.php b/src/Symfony/Bridge/Doctrine/Tests/Security/User/EntityUserProviderTest.php
index 78a2cdb6f33b..9d0f79948ba6 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Security/User/EntityUserProviderTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Security/User/EntityUserProviderTest.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bridge\Doctrine\Tests\Security\User;
 
+use Doctrine\ORM\Tools\SchemaTool;
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\Doctrine\Security\User\EntityUserProvider;
 use Symfony\Bridge\Doctrine\Test\DoctrineTestHelper;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\User;
-use Symfony\Bridge\Doctrine\Security\User\EntityUserProvider;
-use Doctrine\ORM\Tools\SchemaTool;
 
 class EntityUserProviderTest extends TestCase
 {
@@ -146,7 +146,7 @@ public function testSupportProxy()
         $provider = new EntityUserProvider($this->getManager($em), 'Symfony\Bridge\Doctrine\Tests\Fixtures\User', 'name');
 
         $user2 = $em->getReference('Symfony\Bridge\Doctrine\Tests\Fixtures\User', array('id1' => 1, 'id2' => 1));
-        $this->assertTrue($provider->supportsClass(get_class($user2)));
+        $this->assertTrue($provider->supportsClass(\get_class($user2)));
     }
 
     public function testLoadUserByUserNameShouldLoadUserWhenProperInterfaceProvided()
diff --git a/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php b/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
index efc611859a2b..a26ce98107f6 100644
--- a/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
+++ b/src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
@@ -16,23 +16,23 @@
 use Doctrine\Common\Persistence\ObjectManager;
 use Doctrine\Common\Persistence\ObjectRepository;
 use Doctrine\DBAL\Types\Type;
+use Doctrine\ORM\Tools\SchemaTool;
 use Symfony\Bridge\Doctrine\Test\DoctrineTestHelper;
 use Symfony\Bridge\Doctrine\Test\TestRepositoryFactory;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\Employee;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\Person;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\AssociationEntity;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\AssociationEntity2;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\CompositeObjectNoToStringIdEntity;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\DoubleNameEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\DoubleNullableNameEntity;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\AssociationEntity;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\AssociationEntity2;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\Employee;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\Person;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdNoToStringEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdStringWrapperNameEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\Type\StringWrapper;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntityValidator;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
-use Doctrine\ORM\Tools\SchemaTool;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
diff --git a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
index 004de6f67e5a..2015e7fb3acc 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
@@ -15,9 +15,9 @@
 use Doctrine\Common\Persistence\Mapping\ClassMetadata;
 use Doctrine\Common\Persistence\ObjectManager;
 use Symfony\Component\Validator\Constraint;
-use Symfony\Component\Validator\Exception\UnexpectedTypeException;
-use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
 use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 
 /**
  * Unique Entity Validator checks if one or a set of fields contain unique values.
@@ -46,17 +46,17 @@ public function validate($entity, Constraint $constraint)
             throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\UniqueEntity');
         }
 
-        if (!is_array($constraint->fields) && !is_string($constraint->fields)) {
+        if (!\is_array($constraint->fields) && !\is_string($constraint->fields)) {
             throw new UnexpectedTypeException($constraint->fields, 'array');
         }
 
-        if (null !== $constraint->errorPath && !is_string($constraint->errorPath)) {
+        if (null !== $constraint->errorPath && !\is_string($constraint->errorPath)) {
             throw new UnexpectedTypeException($constraint->errorPath, 'string or null');
         }
 
         $fields = (array) $constraint->fields;
 
-        if (0 === count($fields)) {
+        if (0 === \count($fields)) {
             throw new ConstraintDefinitionException('At least one field has to be specified.');
         }
 
@@ -71,14 +71,14 @@ public function validate($entity, Constraint $constraint)
                 throw new ConstraintDefinitionException(sprintf('Object manager "%s" does not exist.', $constraint->em));
             }
         } else {
-            $em = $this->registry->getManagerForClass(get_class($entity));
+            $em = $this->registry->getManagerForClass(\get_class($entity));
 
             if (!$em) {
-                throw new ConstraintDefinitionException(sprintf('Unable to find the object manager associated with an entity of class "%s".', get_class($entity)));
+                throw new ConstraintDefinitionException(sprintf('Unable to find the object manager associated with an entity of class "%s".', \get_class($entity)));
             }
         }
 
-        $class = $em->getClassMetadata(get_class($entity));
+        $class = $em->getClassMetadata(\get_class($entity));
         /* @var $class \Doctrine\Common\Persistence\Mapping\ClassMetadata */
 
         $criteria = array();
@@ -133,7 +133,7 @@ public function validate($entity, Constraint $constraint)
                 throw new ConstraintDefinitionException(sprintf('The "%s" entity repository does not support the "%s" entity. The entity should be an instance of or extend "%s".', $constraint->entityClass, $class->getName(), $supportedClass));
             }
         } else {
-            $repository = $em->getRepository(get_class($entity));
+            $repository = $em->getRepository(\get_class($entity));
         }
 
         $result = $repository->{$constraint->repositoryMethod}($criteria);
@@ -182,11 +182,11 @@ public function validate($entity, Constraint $constraint)
 
     private function formatWithIdentifiers(ObjectManager $em, ClassMetadata $class, $value)
     {
-        if (!is_object($value) || $value instanceof \DateTimeInterface) {
+        if (!\is_object($value) || $value instanceof \DateTimeInterface) {
             return $this->formatValue($value, self::PRETTY_DATE);
         }
 
-        if ($class->getName() !== $idClass = get_class($value)) {
+        if ($class->getName() !== $idClass = \get_class($value)) {
             // non unique value might be a composite PK that consists of other entity objects
             if ($em->getMetadataFactory()->hasMetadataFor($idClass)) {
                 $identifiers = $em->getClassMetadata($idClass)->getIdentifierValues($value);
@@ -204,10 +204,10 @@ private function formatWithIdentifiers(ObjectManager $em, ClassMetadata $class,
         }
 
         array_walk($identifiers, function (&$id, $field) {
-            if (!is_object($id) || $id instanceof \DateTimeInterface) {
+            if (!\is_object($id) || $id instanceof \DateTimeInterface) {
                 $idAsString = $this->formatValue($id, self::PRETTY_DATE);
             } else {
-                $idAsString = sprintf('object("%s")', get_class($id));
+                $idAsString = sprintf('object("%s")', \get_class($id));
             }
 
             $id = sprintf('%s => %s', $field, $idAsString);
diff --git a/src/Symfony/Bridge/Doctrine/Validator/DoctrineInitializer.php b/src/Symfony/Bridge/Doctrine/Validator/DoctrineInitializer.php
index 42cafdd12947..010c051581e7 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/DoctrineInitializer.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/DoctrineInitializer.php
@@ -30,7 +30,7 @@ public function __construct(ManagerRegistry $registry)
 
     public function initialize($object)
     {
-        $manager = $this->registry->getManagerForClass(get_class($object));
+        $manager = $this->registry->getManagerForClass(\get_class($object));
         if (null !== $manager) {
             $manager->initializeObject($object);
         }
diff --git a/src/Symfony/Bridge/Monolog/Handler/FingersCrossed/NotFoundActivationStrategy.php b/src/Symfony/Bridge/Monolog/Handler/FingersCrossed/NotFoundActivationStrategy.php
index 596fcdd84d2c..ed41929a2cef 100644
--- a/src/Symfony/Bridge/Monolog/Handler/FingersCrossed/NotFoundActivationStrategy.php
+++ b/src/Symfony/Bridge/Monolog/Handler/FingersCrossed/NotFoundActivationStrategy.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bridge\Monolog\Handler\FingersCrossed;
 
 use Monolog\Handler\FingersCrossed\ErrorLevelActivationStrategy;
-use Symfony\Component\HttpKernel\Exception\HttpException;
 use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpKernel\Exception\HttpException;
 
 /**
  * Activation strategy that ignores 404s for certain URLs.
diff --git a/src/Symfony/Bridge/Monolog/Handler/FirePHPHandler.php b/src/Symfony/Bridge/Monolog/Handler/FirePHPHandler.php
index 966a7baf8307..9956edad386d 100644
--- a/src/Symfony/Bridge/Monolog/Handler/FirePHPHandler.php
+++ b/src/Symfony/Bridge/Monolog/Handler/FirePHPHandler.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bridge\Monolog\Handler;
 
 use Monolog\Handler\FirePHPHandler as BaseFirePHPHandler;
-use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 
 /**
  * FirePHPHandler.
diff --git a/src/Symfony/Bridge/Monolog/Handler/ServerLogHandler.php b/src/Symfony/Bridge/Monolog/Handler/ServerLogHandler.php
index 99979c5a80ba..6c21a335f085 100644
--- a/src/Symfony/Bridge/Monolog/Handler/ServerLogHandler.php
+++ b/src/Symfony/Bridge/Monolog/Handler/ServerLogHandler.php
@@ -102,7 +102,7 @@ private function formatRecord(array $record)
     {
         if ($this->processors) {
             foreach ($this->processors as $processor) {
-                $record = call_user_func($processor, $record);
+                $record = \call_user_func($processor, $record);
             }
         }
 
diff --git a/src/Symfony/Bridge/Monolog/Tests/Handler/ConsoleHandlerTest.php b/src/Symfony/Bridge/Monolog/Tests/Handler/ConsoleHandlerTest.php
index 63b5a8f07b6d..92b319f13a98 100644
--- a/src/Symfony/Bridge/Monolog/Tests/Handler/ConsoleHandlerTest.php
+++ b/src/Symfony/Bridge/Monolog/Tests/Handler/ConsoleHandlerTest.php
@@ -14,13 +14,13 @@
 use Monolog\Logger;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Monolog\Handler\ConsoleHandler;
+use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\ConsoleEvents;
 use Symfony\Component\Console\Event\ConsoleCommandEvent;
 use Symfony\Component\Console\Event\ConsoleTerminateEvent;
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\EventDispatcher\EventDispatcher;
-use Symfony\Component\Console\Command\Command;
 
 /**
  * Tests the ConsoleHandler and also the ConsoleFormatter.
diff --git a/src/Symfony/Bridge/Monolog/Tests/LoggerTest.php b/src/Symfony/Bridge/Monolog/Tests/LoggerTest.php
index aeb3b55fdc49..f3c54fdde50b 100644
--- a/src/Symfony/Bridge/Monolog/Tests/LoggerTest.php
+++ b/src/Symfony/Bridge/Monolog/Tests/LoggerTest.php
@@ -13,8 +13,8 @@
 
 use Monolog\Handler\TestHandler;
 use PHPUnit\Framework\TestCase;
-use Symfony\Bridge\Monolog\Processor\DebugProcessor;
 use Symfony\Bridge\Monolog\Logger;
+use Symfony\Bridge\Monolog\Processor\DebugProcessor;
 
 class LoggerTest extends TestCase
 {
diff --git a/src/Symfony/Bridge/PhpUnit/ClockMock.php b/src/Symfony/Bridge/PhpUnit/ClockMock.php
index 40ed8ecc0e45..9ab2c779b33d 100644
--- a/src/Symfony/Bridge/PhpUnit/ClockMock.php
+++ b/src/Symfony/Bridge/PhpUnit/ClockMock.php
@@ -71,7 +71,7 @@ public static function microtime($asFloat = false)
 
     public static function register($class)
     {
-        $self = get_called_class();
+        $self = \get_called_class();
 
         $mockedNs = array(substr($class, 0, strrpos($class, '\\')));
         if (0 < strpos($class, '\\Tests\\')) {
@@ -81,7 +81,7 @@ public static function register($class)
             $mockedNs[] = substr($class, 6, strrpos($class, '\\') - 6);
         }
         foreach ($mockedNs as $ns) {
-            if (function_exists($ns.'\time')) {
+            if (\function_exists($ns.'\time')) {
                 continue;
             }
             eval(<<<EOPHP
diff --git a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
index a2528db303fb..e016b4097364 100644
--- a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
+++ b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
@@ -68,7 +68,7 @@ public static function register($mode = 0)
                 foreach (get_declared_classes() as $class) {
                     if ('C' === $class[0] && 0 === strpos($class, 'ComposerAutoloaderInit')) {
                         $r = new \ReflectionClass($class);
-                        $v = dirname(dirname($r->getFileName()));
+                        $v = \dirname(\dirname($r->getFileName()));
                         if (file_exists($v.'/composer/installed.json')) {
                             $vendors[] = $v;
                         }
@@ -80,7 +80,7 @@ public static function register($mode = 0)
                 return true;
             }
             foreach ($vendors as $vendor) {
-                if (0 === strpos($realPath, $vendor) && false !== strpbrk(substr($realPath, strlen($vendor), 1), '/'.DIRECTORY_SEPARATOR)) {
+                if (0 === strpos($realPath, $vendor) && false !== strpbrk(substr($realPath, \strlen($vendor), 1), '/'.\DIRECTORY_SEPARATOR)) {
                     return true;
                 }
             }
@@ -112,7 +112,7 @@ public static function register($mode = 0)
             $group = 'other';
             $isVendor = DeprecationErrorHandler::MODE_WEAK_VENDORS === $mode && $inVendors($file);
 
-            $i = count($trace);
+            $i = \count($trace);
             while (1 < $i && (!isset($trace[--$i]['class']) || ('ReflectionMethod' === $trace[$i]['class'] || 0 === strpos($trace[$i]['class'], 'PHPUnit_') || 0 === strpos($trace[$i]['class'], 'PHPUnit\\')))) {
                 // No-op
             }
@@ -129,7 +129,7 @@ public static function register($mode = 0)
                     // if the error has been triggered from vendor code.
                     $isVendor = DeprecationErrorHandler::MODE_WEAK_VENDORS === $mode && isset($parsedMsg['triggering_file']) && $inVendors($parsedMsg['triggering_file']);
                 } else {
-                    $class = isset($trace[$i]['object']) ? get_class($trace[$i]['object']) : $trace[$i]['class'];
+                    $class = isset($trace[$i]['object']) ? \get_class($trace[$i]['object']) : $trace[$i]['class'];
                     $method = $trace[$i]['function'];
                 }
 
@@ -141,7 +141,7 @@ public static function register($mode = 0)
                     || 0 === strpos($method, 'provideLegacy')
                     || 0 === strpos($method, 'getLegacy')
                     || strpos($class, '\Legacy')
-                    || in_array('legacy', $Test::getGroups($class, $method), true)
+                    || \in_array('legacy', $Test::getGroups($class, $method), true)
                 ) {
                     $group = 'legacy';
                 } elseif ($isVendor) {
@@ -154,12 +154,12 @@ public static function register($mode = 0)
                     $e = new \Exception($msg);
                     $r = new \ReflectionProperty($e, 'trace');
                     $r->setAccessible(true);
-                    $r->setValue($e, array_slice($trace, 1, $i));
+                    $r->setValue($e, \array_slice($trace, 1, $i));
 
                     echo "\n".ucfirst($group).' deprecation triggered by '.$class.'::'.$method.':';
                     echo "\n".$msg;
                     echo "\nStack trace:";
-                    echo "\n".str_replace(' '.getcwd().DIRECTORY_SEPARATOR, ' ', $e->getTraceAsString());
+                    echo "\n".str_replace(' '.getcwd().\DIRECTORY_SEPARATOR, ' ', $e->getTraceAsString());
                     echo "\n";
 
                     exit(1);
@@ -255,12 +255,12 @@ public static function register($mode = 0)
 
                 // reset deprecations array
                 foreach ($deprecations as $group => $arrayOrInt) {
-                    $deprecations[$group] = is_int($arrayOrInt) ? 0 : array();
+                    $deprecations[$group] = \is_int($arrayOrInt) ? 0 : array();
                 }
 
                 register_shutdown_function(function () use (&$deprecations, $isFailing, $displayDeprecations, $mode) {
                     foreach ($deprecations as $group => $arrayOrInt) {
-                        if (0 < (is_int($arrayOrInt) ? $arrayOrInt : count($arrayOrInt))) {
+                        if (0 < (\is_int($arrayOrInt) ? $arrayOrInt : \count($arrayOrInt))) {
                             echo "Shutdown-time deprecations:\n";
                             break;
                         }
@@ -307,7 +307,7 @@ public static function collectDeprecations($outputFile)
      */
     private static function hasColorSupport()
     {
-        if (!defined('STDOUT')) {
+        if (!\defined('STDOUT')) {
             return false;
         }
 
@@ -315,19 +315,19 @@ private static function hasColorSupport()
             return true;
         }
 
-        if (DIRECTORY_SEPARATOR === '\\') {
-            return (function_exists('sapi_windows_vt100_support')
+        if (\DIRECTORY_SEPARATOR === '\\') {
+            return (\function_exists('sapi_windows_vt100_support')
                 && sapi_windows_vt100_support(STDOUT))
                 || false !== getenv('ANSICON')
                 || 'ON' === getenv('ConEmuANSI')
                 || 'xterm' === getenv('TERM');
         }
 
-        if (function_exists('stream_isatty')) {
+        if (\function_exists('stream_isatty')) {
             return stream_isatty(STDOUT);
         }
 
-        if (function_exists('posix_isatty')) {
+        if (\function_exists('posix_isatty')) {
             return posix_isatty(STDOUT);
         }
 
diff --git a/src/Symfony/Bridge/PhpUnit/DnsMock.php b/src/Symfony/Bridge/PhpUnit/DnsMock.php
index a85ec977c71d..790cfa91af5c 100644
--- a/src/Symfony/Bridge/PhpUnit/DnsMock.php
+++ b/src/Symfony/Bridge/PhpUnit/DnsMock.php
@@ -163,7 +163,7 @@ public static function dns_get_record($hostname, $type = DNS_ANY, &$authns = nul
 
     public static function register($class)
     {
-        $self = get_called_class();
+        $self = \get_called_class();
 
         $mockedNs = array(substr($class, 0, strrpos($class, '\\')));
         if (0 < strpos($class, '\\Tests\\')) {
@@ -173,7 +173,7 @@ public static function register($class)
             $mockedNs[] = substr($class, 6, strrpos($class, '\\') - 6);
         }
         foreach ($mockedNs as $ns) {
-            if (function_exists($ns.'\checkdnsrr')) {
+            if (\function_exists($ns.'\checkdnsrr')) {
                 continue;
             }
             eval(<<<EOPHP
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php b/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
index ab1cda6702be..8e9bdbe92ed4 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
@@ -58,7 +58,7 @@ public function startTest($test)
                 if (method_exists($test->getTestResultObject(), 'addWarning') && class_exists(Warning::class)) {
                     $test->getTestResultObject()->addWarning($test, new Warning($message), 0);
                 } else {
-                    $this->warnings[] = sprintf("%s::%s\n%s", get_class($test), $test->getName(), $message);
+                    $this->warnings[] = sprintf("%s::%s\n%s", \get_class($test), $test->getName(), $message);
                 }
             }
 
@@ -75,7 +75,7 @@ public function startTest($test)
 
         $cache = $r->getValue();
         $cache = array_replace_recursive($cache, array(
-            get_class($test) => array(
+            \get_class($test) => array(
                 'covers' => array($sutFqcn),
             ),
         ));
@@ -90,7 +90,7 @@ private function findSutFqcn($test)
             return $resolver($test);
         }
 
-        $class = get_class($test);
+        $class = \get_class($test);
 
         $sutFqcn = str_replace('\\Tests\\', '\\', $class);
         $sutFqcn = preg_replace('{Test$}', '', $sutFqcn);
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
index 7ded32a78246..d072e7e91ffa 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
@@ -53,7 +53,7 @@ public function __construct(array $mockedNamespaces = array())
         }
 
         foreach ($mockedNamespaces as $type => $namespaces) {
-            if (!is_array($namespaces)) {
+            if (!\is_array($namespaces)) {
                 $namespaces = array($namespaces);
             }
             if ('time-sensitive' === $type) {
@@ -98,10 +98,10 @@ public function startTestSuite($suite)
         $this->testsWithWarnings = array();
 
         foreach ($suite->tests() as $test) {
-            if (!($test instanceof \PHPUnit_Framework_TestCase || $test instanceof TestCase)) {
+            if (!($test instanceof \PHPUnit\Framework\TestCase || $test instanceof TestCase)) {
                 continue;
             }
-            if (null === $Test::getPreserveGlobalStateSettings(get_class($test), $test->getName(false))) {
+            if (null === $Test::getPreserveGlobalStateSettings(\get_class($test), $test->getName(false))) {
                 $test->setPreserveGlobalState(false);
             }
         }
@@ -139,10 +139,10 @@ public function startTestSuite($suite)
                             continue;
                         }
                         $groups = $Test::getGroups($test->getName());
-                        if (in_array('time-sensitive', $groups, true)) {
+                        if (\in_array('time-sensitive', $groups, true)) {
                             ClockMock::register($test->getName());
                         }
-                        if (in_array('dns-sensitive', $groups, true)) {
+                        if (\in_array('dns-sensitive', $groups, true)) {
                             DnsMock::register($test->getName());
                         }
                     }
@@ -151,7 +151,7 @@ public function startTestSuite($suite)
         } elseif (2 === $this->state) {
             $skipped = array();
             foreach ($suite->tests() as $test) {
-                if (!($test instanceof \PHPUnit_Framework_TestCase || $test instanceof TestCase)
+                if (!($test instanceof \PHPUnit\Framework\TestCase || $test instanceof TestCase)
                     || isset($this->wasSkipped[$suiteName]['*'])
                     || isset($this->wasSkipped[$suiteName][$test->getName()])) {
                     $skipped[] = $test;
@@ -164,8 +164,8 @@ public function startTestSuite($suite)
     public function addSkippedTest($test, \Exception $e, $time)
     {
         if (0 < $this->state) {
-            if ($test instanceof \PHPUnit_Framework_TestCase || $test instanceof TestCase) {
-                $class = get_class($test);
+            if ($test instanceof \PHPUnit\Framework\TestCase || $test instanceof TestCase) {
+                $class = \get_class($test);
                 $method = $test->getName();
             } else {
                 $class = $test->getName();
@@ -178,7 +178,7 @@ public function addSkippedTest($test, \Exception $e, $time)
 
     public function startTest($test)
     {
-        if (-2 < $this->state && ($test instanceof \PHPUnit_Framework_TestCase || $test instanceof TestCase)) {
+        if (-2 < $this->state && ($test instanceof \PHPUnit\Framework\TestCase || $test instanceof TestCase)) {
             if (null !== $test->getTestResultObject()) {
                 $this->reportUselessTests = $test->getTestResultObject()->isStrictAboutTestsThatDoNotTestAnything();
             }
@@ -196,25 +196,25 @@ public function startTest($test)
                 $Test = 'PHPUnit\Util\Test';
                 $AssertionFailedError = 'PHPUnit\Framework\AssertionFailedError';
             }
-            $groups = $Test::getGroups(get_class($test), $test->getName(false));
+            $groups = $Test::getGroups(\get_class($test), $test->getName(false));
 
             if (!$this->runsInSeparateProcess) {
-                if (in_array('time-sensitive', $groups, true)) {
-                    ClockMock::register(get_class($test));
+                if (\in_array('time-sensitive', $groups, true)) {
+                    ClockMock::register(\get_class($test));
                     ClockMock::withClockMock(true);
                 }
-                if (in_array('dns-sensitive', $groups, true)) {
-                    DnsMock::register(get_class($test));
+                if (\in_array('dns-sensitive', $groups, true)) {
+                    DnsMock::register(\get_class($test));
                 }
             }
 
-            $annotations = $Test::parseTestMethodAnnotations(get_class($test), $test->getName(false));
+            $annotations = $Test::parseTestMethodAnnotations(\get_class($test), $test->getName(false));
 
             if (isset($annotations['class']['expectedDeprecation'])) {
                 $test->getTestResultObject()->addError($test, new $AssertionFailedError('`@expectedDeprecation` annotations are not allowed at the class level.'), 0);
             }
             if (isset($annotations['method']['expectedDeprecation'])) {
-                if (!in_array('legacy', $groups, true)) {
+                if (!\in_array('legacy', $groups, true)) {
                     $this->error = new $AssertionFailedError('Only tests with the `@group legacy` annotation can have `@expectedDeprecation`.');
                 }
 
@@ -228,7 +228,7 @@ public function startTest($test)
 
     public function addWarning($test, $e, $time)
     {
-        if ($test instanceof \PHPUnit_Framework_TestCase || $test instanceof TestCase) {
+        if ($test instanceof \PHPUnit\Framework\TestCase || $test instanceof TestCase) {
             $this->testsWithWarnings[$test->getName()] = true;
         }
     }
@@ -244,7 +244,7 @@ public function endTest($test, $time)
             $BaseTestRunner = 'PHPUnit\Runner\BaseTestRunner';
             $Warning = 'PHPUnit\Framework\Warning';
         }
-        $className = get_class($test);
+        $className = \get_class($test);
         $classGroups = $Test::getGroups($className);
         $groups = $Test::getGroups($className, $test->getName(false));
 
@@ -265,7 +265,7 @@ public function endTest($test, $time)
             foreach ($deprecations ? unserialize($deprecations) : array() as $deprecation) {
                 $error = serialize(array('deprecation' => $deprecation[1], 'class' => $className, 'method' => $test->getName(false), 'triggering_file' => isset($deprecation[2]) ? $deprecation[2] : null));
                 if ($deprecation[0]) {
-                    trigger_error($error, E_USER_DEPRECATED);
+                    @trigger_error($error, E_USER_DEPRECATED);
                 } else {
                     @trigger_error($error, E_USER_DEPRECATED);
                 }
@@ -274,13 +274,13 @@ public function endTest($test, $time)
         }
 
         if ($this->expectedDeprecations) {
-            if (!in_array($test->getStatus(), array($BaseTestRunner::STATUS_SKIPPED, $BaseTestRunner::STATUS_INCOMPLETE), true)) {
-                $test->addToAssertionCount(count($this->expectedDeprecations));
+            if (!\in_array($test->getStatus(), array($BaseTestRunner::STATUS_SKIPPED, $BaseTestRunner::STATUS_INCOMPLETE), true)) {
+                $test->addToAssertionCount(\count($this->expectedDeprecations));
             }
 
             restore_error_handler();
 
-            if (!$errored && !in_array($test->getStatus(), array($BaseTestRunner::STATUS_SKIPPED, $BaseTestRunner::STATUS_INCOMPLETE, $BaseTestRunner::STATUS_FAILURE, $BaseTestRunner::STATUS_ERROR), true)) {
+            if (!$errored && !\in_array($test->getStatus(), array($BaseTestRunner::STATUS_SKIPPED, $BaseTestRunner::STATUS_INCOMPLETE, $BaseTestRunner::STATUS_FAILURE, $BaseTestRunner::STATUS_ERROR), true)) {
                 try {
                     $prefix = "@expectedDeprecation:\n";
                     $test->assertStringMatchesFormat($prefix.'%A  '.implode("\n%A  ", $this->expectedDeprecations)."\n%A", $prefix.'  '.implode("\n  ", $this->gatheredDeprecations)."\n");
@@ -294,11 +294,11 @@ public function endTest($test, $time)
             $this->expectedDeprecations = $this->gatheredDeprecations = array();
             $this->previousErrorHandler = null;
         }
-        if (!$this->runsInSeparateProcess && -2 < $this->state && ($test instanceof \PHPUnit_Framework_TestCase || $test instanceof TestCase)) {
-            if (in_array('time-sensitive', $groups, true)) {
+        if (!$this->runsInSeparateProcess && -2 < $this->state && ($test instanceof \PHPUnit\Framework\TestCase || $test instanceof TestCase)) {
+            if (\in_array('time-sensitive', $groups, true)) {
                 ClockMock::withClockMock(false);
             }
-            if (in_array('dns-sensitive', $groups, true)) {
+            if (\in_array('dns-sensitive', $groups, true)) {
                 DnsMock::withMockedHosts(array());
             }
         }
@@ -314,7 +314,7 @@ public function handleError($type, $msg, $file, $line, $context = array())
         // If the message is serialized we need to extract the message. This occurs when the error is triggered by
         // by the isolated test path in \Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerTrait::endTest().
         $parsedMsg = @unserialize($msg);
-        if (is_array($parsedMsg)) {
+        if (\is_array($parsedMsg)) {
             $msg = $parsedMsg['deprecation'];
         }
         if (error_reporting()) {
diff --git a/src/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/LazyLoadingValueHolderFactoryV2.php b/src/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/LazyLoadingValueHolderFactoryV2.php
index f41fc20b5d52..a643f33710dd 100644
--- a/src/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/LazyLoadingValueHolderFactoryV2.php
+++ b/src/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/LazyLoadingValueHolderFactoryV2.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bridge\ProxyManager\LazyProxy\Instantiator;
 
-use ProxyManager\ProxyGenerator\ProxyGeneratorInterface;
 use ProxyManager\Factory\LazyLoadingValueHolderFactory as BaseFactory;
+use ProxyManager\ProxyGenerator\ProxyGeneratorInterface;
 use Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\LazyLoadingValueHolderGenerator;
 
 /**
diff --git a/src/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/RuntimeInstantiator.php b/src/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/RuntimeInstantiator.php
index 33fc49e1012d..7d083a6981e2 100644
--- a/src/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/RuntimeInstantiator.php
+++ b/src/Symfony/Bridge/ProxyManager/LazyProxy/Instantiator/RuntimeInstantiator.php
@@ -51,7 +51,7 @@ public function instantiateProxy(ContainerInterface $container, Definition $defi
         return $this->factory->createProxy(
             $definition->getClass(),
             function (&$wrappedInstance, LazyLoadingInterface $proxy) use ($realInstantiator) {
-                $wrappedInstance = call_user_func($realInstantiator);
+                $wrappedInstance = \call_user_func($realInstantiator);
 
                 $proxy->setProxyInitializer(null);
 
diff --git a/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php b/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
index 0871c4ce9d70..18da9118a222 100644
--- a/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
+++ b/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
@@ -114,7 +114,7 @@ private static function getProxyManagerVersion(): string
             return '0.0.1';
         }
 
-        return defined(Version::class.'::VERSION') ? Version::VERSION : Version::getVersion();
+        return \defined(Version::class.'::VERSION') ? Version::VERSION : Version::getVersion();
     }
 
     /**
diff --git a/src/Symfony/Bridge/Twig/AppVariable.php b/src/Symfony/Bridge/Twig/AppVariable.php
index 54a785c0a433..702edcbceaa7 100644
--- a/src/Symfony/Bridge/Twig/AppVariable.php
+++ b/src/Symfony/Bridge/Twig/AppVariable.php
@@ -83,7 +83,7 @@ public function getUser()
         }
 
         $user = $token->getUser();
-        if (is_object($user)) {
+        if (\is_object($user)) {
             return $user;
         }
     }
@@ -169,7 +169,7 @@ public function getFlashes($types = null)
             return $session->getFlashBag()->all();
         }
 
-        if (is_string($types)) {
+        if (\is_string($types)) {
             return $session->getFlashBag()->get($types);
         }
 
diff --git a/src/Symfony/Bridge/Twig/Command/DebugCommand.php b/src/Symfony/Bridge/Twig/Command/DebugCommand.php
index 902dbb317d25..74e83919cfda 100644
--- a/src/Symfony/Bridge/Twig/Command/DebugCommand.php
+++ b/src/Symfony/Bridge/Twig/Command/DebugCommand.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Twig\Environment;
@@ -111,15 +111,15 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $firstNamespace = true;
         $prevHasSeparator = false;
         foreach ($this->getLoaderPaths() as $namespace => $paths) {
-            if (!$firstNamespace && !$prevHasSeparator && count($paths) > 1) {
+            if (!$firstNamespace && !$prevHasSeparator && \count($paths) > 1) {
                 $rows[] = array('', '');
             }
             $firstNamespace = false;
             foreach ($paths as $path) {
-                $rows[] = array($namespace, $path.DIRECTORY_SEPARATOR);
+                $rows[] = array($namespace, $path.\DIRECTORY_SEPARATOR);
                 $namespace = '';
             }
-            if (count($paths) > 1) {
+            if (\count($paths) > 1) {
                 $rows[] = array('', '');
                 $prevHasSeparator = true;
             } else {
@@ -145,7 +145,7 @@ private function getLoaderPaths()
         foreach ($loader->getNamespaces() as $namespace) {
             $paths = array_map(function ($path) {
                 if (null !== $this->projectDir && 0 === strpos($path, $this->projectDir)) {
-                    $path = ltrim(substr($path, strlen($this->projectDir)), DIRECTORY_SEPARATOR);
+                    $path = ltrim(substr($path, \strlen($this->projectDir)), \DIRECTORY_SEPARATOR);
                 }
 
                 return $path;
@@ -176,16 +176,16 @@ private function getMetadata($type, $entity)
             if (null === $cb) {
                 return;
             }
-            if (is_array($cb)) {
+            if (\is_array($cb)) {
                 if (!method_exists($cb[0], $cb[1])) {
                     return;
                 }
                 $refl = new \ReflectionMethod($cb[0], $cb[1]);
-            } elseif (is_object($cb) && method_exists($cb, '__invoke')) {
+            } elseif (\is_object($cb) && method_exists($cb, '__invoke')) {
                 $refl = new \ReflectionMethod($cb, '__invoke');
-            } elseif (function_exists($cb)) {
+            } elseif (\function_exists($cb)) {
                 $refl = new \ReflectionFunction($cb);
-            } elseif (is_string($cb) && preg_match('{^(.+)::(.+)$}', $cb, $m) && method_exists($m[1], $m[2])) {
+            } elseif (\is_string($cb) && preg_match('{^(.+)::(.+)$}', $cb, $m) && method_exists($m[1], $m[2])) {
                 $refl = new \ReflectionMethod($m[1], $m[2]);
             } else {
                 throw new \UnexpectedValueException('Unsupported callback type');
@@ -235,8 +235,8 @@ private function getPrettyMetadata($type, $entity)
         }
 
         if ('globals' === $type) {
-            if (is_object($meta)) {
-                return ' = object('.get_class($meta).')';
+            if (\is_object($meta)) {
+                return ' = object('.\get_class($meta).')';
             }
 
             return ' = '.substr(@json_encode($meta), 0, 50);
diff --git a/src/Symfony/Bridge/Twig/Command/LintCommand.php b/src/Symfony/Bridge/Twig/Command/LintCommand.php
index 84a62ae93395..68eebf123cf8 100644
--- a/src/Symfony/Bridge/Twig/Command/LintCommand.php
+++ b/src/Symfony/Bridge/Twig/Command/LintCommand.php
@@ -77,7 +77,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $io = new SymfonyStyle($input, $output);
         $filenames = $input->getArgument('filename');
 
-        if (0 === count($filenames)) {
+        if (0 === \count($filenames)) {
             if (0 !== ftell(STDIN)) {
                 throw new RuntimeException('Please provide a filename or pipe template content to STDIN.');
             }
@@ -162,9 +162,9 @@ private function displayTxt(OutputInterface $output, SymfonyStyle $io, $filesInf
         }
 
         if (0 === $errors) {
-            $io->success(sprintf('All %d Twig files contain valid syntax.', count($filesInfo)));
+            $io->success(sprintf('All %d Twig files contain valid syntax.', \count($filesInfo)));
         } else {
-            $io->warning(sprintf('%d Twig files have valid syntax and %d contain errors.', count($filesInfo) - $errors, $errors));
+            $io->warning(sprintf('%d Twig files have valid syntax and %d contain errors.', \count($filesInfo) - $errors, $errors));
         }
 
         return min($errors, 1);
@@ -217,7 +217,7 @@ private function getContext($template, $line, $context = 3)
         $lines = explode("\n", $template);
 
         $position = max(0, $line - $context);
-        $max = min(count($lines), $line - 1 + $context);
+        $max = min(\count($lines), $line - 1 + $context);
 
         $result = array();
         while ($position < $max) {
diff --git a/src/Symfony/Bridge/Twig/DataCollector/TwigDataCollector.php b/src/Symfony/Bridge/Twig/DataCollector/TwigDataCollector.php
index 8d9f58e64c1d..9e214fc73101 100644
--- a/src/Symfony/Bridge/Twig/DataCollector/TwigDataCollector.php
+++ b/src/Symfony/Bridge/Twig/DataCollector/TwigDataCollector.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Bridge\Twig\DataCollector;
 
-use Symfony\Component\HttpKernel\DataCollector\DataCollector;
-use Symfony\Component\HttpKernel\DataCollector\LateDataCollectorInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\DataCollector;
+use Symfony\Component\HttpKernel\DataCollector\LateDataCollectorInterface;
 use Twig\Environment;
 use Twig\Markup;
 use Twig\Profiler\Dumper\HtmlDumper;
diff --git a/src/Symfony/Bridge/Twig/Extension/CodeExtension.php b/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
index c0982fab00a2..f84eaeb7e72e 100644
--- a/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
@@ -34,7 +34,7 @@ class CodeExtension extends AbstractExtension
     public function __construct($fileLinkFormat, string $rootDir, string $charset)
     {
         $this->fileLinkFormat = $fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
-        $this->rootDir = str_replace('/', DIRECTORY_SEPARATOR, dirname($rootDir)).DIRECTORY_SEPARATOR;
+        $this->rootDir = str_replace('/', \DIRECTORY_SEPARATOR, \dirname($rootDir)).\DIRECTORY_SEPARATOR;
         $this->charset = $charset;
     }
 
@@ -94,7 +94,7 @@ public function formatArgs($args)
                 $short = array_pop($parts);
                 $formattedValue = sprintf('<em>object</em>(<abbr title="%s">%s</abbr>)', $item[1], $short);
             } elseif ('array' === $item[0]) {
-                $formattedValue = sprintf('<em>array</em>(%s)', is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
+                $formattedValue = sprintf('<em>array</em>(%s)', \is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
             } elseif ('null' === $item[0]) {
                 $formattedValue = '<em>null</em>';
             } elseif ('boolean' === $item[0]) {
@@ -105,7 +105,7 @@ public function formatArgs($args)
                 $formattedValue = str_replace("\n", '', htmlspecialchars(var_export($item[1], true), ENT_COMPAT | ENT_SUBSTITUTE, $this->charset));
             }
 
-            $result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", $key, $formattedValue);
+            $result[] = \is_int($key) ? $formattedValue : sprintf("'%s' => %s", $key, $formattedValue);
         }
 
         return implode(', ', $result);
@@ -148,10 +148,10 @@ public function fileExcerpt($file, $line, $srcContext = 3)
 
             $lines = array();
             if (0 > $srcContext) {
-                $srcContext = count($content);
+                $srcContext = \count($content);
             }
 
-            for ($i = max($line - $srcContext, 1), $max = min($line + $srcContext, count($content)); $i <= $max; ++$i) {
+            for ($i = max($line - $srcContext, 1), $max = min($line + $srcContext, \count($content)); $i <= $max; ++$i) {
                 $lines[] = '<li'.($i == $line ? ' class="selected"' : '').'><a class="anchor" name="line'.$i.'"></a><code>'.self::fixCodeMarkup($content[$i - 1]).'</code></li>';
             }
 
@@ -173,11 +173,11 @@ public function formatFile($file, $line, $text = null)
         $file = trim($file);
 
         if (null === $text) {
-            $text = str_replace('/', DIRECTORY_SEPARATOR, $file);
+            $text = str_replace('/', \DIRECTORY_SEPARATOR, $file);
             if (0 === strpos($text, $this->rootDir)) {
-                $text = substr($text, strlen($this->rootDir));
-                $text = explode(DIRECTORY_SEPARATOR, $text, 2);
-                $text = sprintf('<abbr title="%s%2$s">%s</abbr>%s', $this->rootDir, $text[0], isset($text[1]) ? DIRECTORY_SEPARATOR.$text[1] : '');
+                $text = substr($text, \strlen($this->rootDir));
+                $text = explode(\DIRECTORY_SEPARATOR, $text, 2);
+                $text = sprintf('<abbr title="%s%2$s">%s</abbr>%s', $this->rootDir, $text[0], isset($text[1]) ? \DIRECTORY_SEPARATOR.$text[1] : '');
             }
         }
 
@@ -203,7 +203,7 @@ public function formatFile($file, $line, $text = null)
     public function getFileLink($file, $line)
     {
         if ($fmt = $this->fileLinkFormat) {
-            return is_string($fmt) ? strtr($fmt, array('%f' => $file, '%l' => $line)) : $fmt->format($file, $line);
+            return \is_string($fmt) ? strtr($fmt, array('%f' => $file, '%l' => $line)) : $fmt->format($file, $line);
         }
 
         return false;
diff --git a/src/Symfony/Bridge/Twig/Extension/DumpExtension.php b/src/Symfony/Bridge/Twig/Extension/DumpExtension.php
index 2cc3f1a4b044..3d4c6841f201 100644
--- a/src/Symfony/Bridge/Twig/Extension/DumpExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/DumpExtension.php
@@ -58,7 +58,7 @@ public function dump(Environment $env, $context)
             return;
         }
 
-        if (2 === func_num_args()) {
+        if (2 === \func_num_args()) {
             $vars = array();
             foreach ($context as $key => $value) {
                 if (!$value instanceof Template) {
@@ -68,7 +68,7 @@ public function dump(Environment $env, $context)
 
             $vars = array($vars);
         } else {
-            $vars = func_get_args();
+            $vars = \func_get_args();
             unset($vars[0], $vars[1]);
         }
 
diff --git a/src/Symfony/Bridge/Twig/Extension/FormExtension.php b/src/Symfony/Bridge/Twig/Extension/FormExtension.php
index 834fbf096ef7..4f50215637dd 100644
--- a/src/Symfony/Bridge/Twig/Extension/FormExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/FormExtension.php
@@ -100,8 +100,8 @@ public function getName()
  */
 function twig_is_selected_choice(ChoiceView $choice, $selectedValue)
 {
-    if (is_array($selectedValue)) {
-        return in_array($choice->value, $selectedValue, true);
+    if (\is_array($selectedValue)) {
+        return \in_array($choice->value, $selectedValue, true);
     }
 
     return $choice->value === $selectedValue;
diff --git a/src/Symfony/Bridge/Twig/Extension/HttpFoundationExtension.php b/src/Symfony/Bridge/Twig/Extension/HttpFoundationExtension.php
index 0dad40cfa0a3..fe2778393cfd 100644
--- a/src/Symfony/Bridge/Twig/Extension/HttpFoundationExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/HttpFoundationExtension.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bridge\Twig\Extension;
 
-use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\Routing\RequestContext;
 use Twig\Extension\AbstractExtension;
 use Twig\TwigFunction;
@@ -97,7 +97,7 @@ public function generateAbsoluteUrl($path)
 
         if (!$path || '/' !== $path[0]) {
             $prefix = $request->getPathInfo();
-            $last = strlen($prefix) - 1;
+            $last = \strlen($prefix) - 1;
             if ($last !== $pos = strrpos($prefix, '/')) {
                 $prefix = substr($prefix, 0, $pos).'/';
             }
diff --git a/src/Symfony/Bridge/Twig/Extension/HttpKernelRuntime.php b/src/Symfony/Bridge/Twig/Extension/HttpKernelRuntime.php
index 3c1f1a015e10..6eea673e25fa 100644
--- a/src/Symfony/Bridge/Twig/Extension/HttpKernelRuntime.php
+++ b/src/Symfony/Bridge/Twig/Extension/HttpKernelRuntime.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bridge\Twig\Extension;
 
-use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
+use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
 
 /**
  * Provides integration with the HttpKernel component.
diff --git a/src/Symfony/Bridge/Twig/Extension/RoutingExtension.php b/src/Symfony/Bridge/Twig/Extension/RoutingExtension.php
index 57e8902dce98..a23a62bb28ae 100644
--- a/src/Symfony/Bridge/Twig/Extension/RoutingExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/RoutingExtension.php
@@ -100,7 +100,7 @@ public function isUrlGenerationSafe(Node $argsNode)
             $argsNode->hasNode(1) ? $argsNode->getNode(1) : null
         );
 
-        if (null === $paramsNode || $paramsNode instanceof ArrayExpression && count($paramsNode) <= 2 &&
+        if (null === $paramsNode || $paramsNode instanceof ArrayExpression && \count($paramsNode) <= 2 &&
             (!$paramsNode->hasNode(1) || $paramsNode->getNode(1) instanceof ConstantExpression)
         ) {
             return array('html');
diff --git a/src/Symfony/Bridge/Twig/Extension/StopwatchExtension.php b/src/Symfony/Bridge/Twig/Extension/StopwatchExtension.php
index 1afbea5f363a..20b0471d53b2 100644
--- a/src/Symfony/Bridge/Twig/Extension/StopwatchExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/StopwatchExtension.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bridge\Twig\Extension;
 
-use Symfony\Component\Stopwatch\Stopwatch;
 use Symfony\Bridge\Twig\TokenParser\StopwatchTokenParser;
+use Symfony\Component\Stopwatch\Stopwatch;
 use Twig\Extension\AbstractExtension;
 
 /**
diff --git a/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php b/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
index f1131c52df61..fe1adc4a7dd0 100644
--- a/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Bridge\Twig\Extension;
 
-use Symfony\Bridge\Twig\TokenParser\TransTokenParser;
+use Symfony\Bridge\Twig\NodeVisitor\TranslationDefaultDomainNodeVisitor;
+use Symfony\Bridge\Twig\NodeVisitor\TranslationNodeVisitor;
 use Symfony\Bridge\Twig\TokenParser\TransChoiceTokenParser;
 use Symfony\Bridge\Twig\TokenParser\TransDefaultDomainTokenParser;
+use Symfony\Bridge\Twig\TokenParser\TransTokenParser;
 use Symfony\Component\Translation\TranslatorInterface;
-use Symfony\Bridge\Twig\NodeVisitor\TranslationNodeVisitor;
-use Symfony\Bridge\Twig\NodeVisitor\TranslationDefaultDomainNodeVisitor;
 use Twig\Extension\AbstractExtension;
 use Twig\NodeVisitor\NodeVisitorInterface;
 use Twig\TokenParser\AbstractTokenParser;
diff --git a/src/Symfony/Bridge/Twig/Extension/YamlExtension.php b/src/Symfony/Bridge/Twig/Extension/YamlExtension.php
index 81f1d32446ab..88b29d7c2312 100644
--- a/src/Symfony/Bridge/Twig/Extension/YamlExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/YamlExtension.php
@@ -42,7 +42,7 @@ public function encode($input, $inline = 0, $dumpObjects = 0)
             $dumper = new YamlDumper();
         }
 
-        if (defined('Symfony\Component\Yaml\Yaml::DUMP_OBJECT')) {
+        if (\defined('Symfony\Component\Yaml\Yaml::DUMP_OBJECT')) {
             return $dumper->dump($input, $inline, 0, $dumpObjects);
         }
 
@@ -51,12 +51,12 @@ public function encode($input, $inline = 0, $dumpObjects = 0)
 
     public function dump($value, $inline = 0, $dumpObjects = false)
     {
-        if (is_resource($value)) {
+        if (\is_resource($value)) {
             return '%Resource%';
         }
 
-        if (is_array($value) || is_object($value)) {
-            return '%'.gettype($value).'% '.$this->encode($value, $inline, $dumpObjects);
+        if (\is_array($value) || \is_object($value)) {
+            return '%'.\gettype($value).'% '.$this->encode($value, $inline, $dumpObjects);
         }
 
         return $this->encode($value, $inline, $dumpObjects);
diff --git a/src/Symfony/Bridge/Twig/Form/TwigRendererEngine.php b/src/Symfony/Bridge/Twig/Form/TwigRendererEngine.php
index 51abce710435..bf97e52ad346 100644
--- a/src/Symfony/Bridge/Twig/Form/TwigRendererEngine.php
+++ b/src/Symfony/Bridge/Twig/Form/TwigRendererEngine.php
@@ -98,7 +98,7 @@ protected function loadResourceForBlockName($cacheKey, FormView $view, $blockNam
 
         // Check each theme whether it contains the searched block
         if (isset($this->themes[$cacheKey])) {
-            for ($i = count($this->themes[$cacheKey]) - 1; $i >= 0; --$i) {
+            for ($i = \count($this->themes[$cacheKey]) - 1; $i >= 0; --$i) {
                 $this->loadResourcesFromTheme($cacheKey, $this->themes[$cacheKey][$i]);
                 // CONTINUE LOADING (see doc comment)
             }
@@ -107,7 +107,7 @@ protected function loadResourceForBlockName($cacheKey, FormView $view, $blockNam
         // Check the default themes once we reach the root view without success
         if (!$view->parent) {
             if (!isset($this->useDefaultThemes[$cacheKey]) || $this->useDefaultThemes[$cacheKey]) {
-                for ($i = count($this->defaultThemes) - 1; $i >= 0; --$i) {
+                for ($i = \count($this->defaultThemes) - 1; $i >= 0; --$i) {
                     $this->loadResourcesFromTheme($cacheKey, $this->defaultThemes[$i]);
                     // CONTINUE LOADING (see doc comment)
                 }
diff --git a/src/Symfony/Bridge/Twig/NodeVisitor/TranslationDefaultDomainNodeVisitor.php b/src/Symfony/Bridge/Twig/NodeVisitor/TranslationDefaultDomainNodeVisitor.php
index 1a60e67a2f94..6a34a037e48f 100644
--- a/src/Symfony/Bridge/Twig/NodeVisitor/TranslationDefaultDomainNodeVisitor.php
+++ b/src/Symfony/Bridge/Twig/NodeVisitor/TranslationDefaultDomainNodeVisitor.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bridge\Twig\NodeVisitor;
 
-use Symfony\Bridge\Twig\Node\TransNode;
 use Symfony\Bridge\Twig\Node\TransDefaultDomainNode;
+use Symfony\Bridge\Twig\Node\TransNode;
 use Twig\Environment;
 use Twig\Node\BlockNode;
 use Twig\Node\Expression\ArrayExpression;
@@ -64,7 +64,7 @@ protected function doEnterNode(Node $node, Environment $env)
             return $node;
         }
 
-        if ($node instanceof FilterExpression && in_array($node->getNode('filter')->getAttribute('value'), array('trans', 'transchoice'))) {
+        if ($node instanceof FilterExpression && \in_array($node->getNode('filter')->getAttribute('value'), array('trans', 'transchoice'))) {
             $arguments = $node->getNode('arguments');
             $ind = 'trans' === $node->getNode('filter')->getAttribute('value') ? 1 : 2;
             if ($this->isNamedArguments($arguments)) {
@@ -119,7 +119,7 @@ public function getPriority()
     private function isNamedArguments($arguments)
     {
         foreach ($arguments as $name => $node) {
-            if (!is_int($name)) {
+            if (!\is_int($name)) {
                 return true;
             }
         }
diff --git a/src/Symfony/Bridge/Twig/Tests/Command/DebugCommandTest.php b/src/Symfony/Bridge/Twig/Tests/Command/DebugCommandTest.php
index 77d522f5230a..39b0d0df5a2b 100644
--- a/src/Symfony/Bridge/Twig/Tests/Command/DebugCommandTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Command/DebugCommandTest.php
@@ -15,8 +15,8 @@
 use Symfony\Bridge\Twig\Command\DebugCommand;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
-use Twig\Loader\FilesystemLoader;
 use Twig\Environment;
+use Twig\Loader\FilesystemLoader;
 
 class DebugCommandTest extends TestCase
 {
@@ -39,7 +39,7 @@ public function testLineSeparatorInLoaderPaths()
             FilesystemLoader::MAIN_NAMESPACE => array('extractor', 'extractor'),
         ));
         $ret = $tester->execute(array(), array('decorated' => false));
-        $ds = DIRECTORY_SEPARATOR;
+        $ds = \DIRECTORY_SEPARATOR;
         $loaderPaths = <<<TXT
 Loader Paths
 ------------
@@ -64,7 +64,7 @@ public function testLineSeparatorInLoaderPaths()
 
     private function createCommandTester(array $paths = array())
     {
-        $filesystemLoader = new FilesystemLoader(array(), dirname(__DIR__).'/Fixtures');
+        $filesystemLoader = new FilesystemLoader(array(), \dirname(__DIR__).'/Fixtures');
         foreach ($paths as $namespace => $relDirs) {
             foreach ($relDirs as $relDir) {
                 $filesystemLoader->addPath($relDir, $namespace);
diff --git a/src/Symfony/Bridge/Twig/Tests/Command/LintCommandTest.php b/src/Symfony/Bridge/Twig/Tests/Command/LintCommandTest.php
index ce7175ab1adf..535a12f3576f 100644
--- a/src/Symfony/Bridge/Twig/Tests/Command/LintCommandTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Command/LintCommandTest.php
@@ -16,8 +16,8 @@
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Tester\CommandTester;
-use Twig\Loader\FilesystemLoader;
 use Twig\Environment;
+use Twig\Loader\FilesystemLoader;
 
 class LintCommandTest extends TestCase
 {
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php
index ce80418c83ba..1522928a6c41 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Twig\Extension\DumpExtension;
+use Symfony\Component\VarDumper\Cloner\VarCloner;
 use Symfony\Component\VarDumper\Dumper\HtmlDumper;
 use Symfony\Component\VarDumper\VarDumper;
-use Symfony\Component\VarDumper\Cloner\VarCloner;
 use Twig\Environment;
 use Twig\Loader\ArrayLoader;
 
@@ -76,7 +76,7 @@ public function testDump($context, $args, $expectedOutput, $debug = true)
         array_unshift($args, $context);
         array_unshift($args, $twig);
 
-        $dump = call_user_func_array(array($extension, 'dump'), $args);
+        $dump = \call_user_func_array(array($extension, 'dump'), $args);
 
         if ($debug) {
             $this->assertStringStartsWith('<script>', $dump);
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
index 309b2df80b16..56690a7e9bf5 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Bridge\Twig\Extension\FormExtension;
-use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
-use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
+use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
+use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
 use Twig\Environment;
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
index 99002c6f1bbb..5a36f6e4fd1b 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Bridge\Twig\Extension\FormExtension;
-use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
-use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
+use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
+use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
 use Twig\Environment;
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
index 1a563d76a26c..27415924e7d1 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Bridge\Twig\Extension\FormExtension;
-use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
-use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
+use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
+use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
 use Twig\Environment;
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
index d93bd3925feb..9c41610d1c73 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Bridge\Twig\Extension\FormExtension;
-use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
-use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
+use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
+use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
 use Twig\Environment;
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
index d2ea4e4a1a35..314f9055c22e 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Bridge\Twig\Extension\FormExtension;
-use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
-use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
+use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
+use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Component\Form\ChoiceList\View\ChoiceView;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
index 5119480d90e4..7f2b900f11d6 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Bridge\Twig\Tests\Extension;
 
-use Symfony\Component\Form\FormRenderer;
-use Symfony\Component\Form\FormView;
-use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Extension\FormExtension;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
-use Symfony\Component\Form\Tests\AbstractTableLayoutTest;
-use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
+use Symfony\Bridge\Twig\Form\TwigRendererEngine;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
+use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
+use Symfony\Component\Form\FormRenderer;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\Form\Tests\AbstractTableLayoutTest;
 use Twig\Environment;
 
 class FormExtensionTableLayoutTest extends AbstractTableLayoutTest
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/HttpFoundationExtensionTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/HttpFoundationExtensionTest.php
index fcff0c0e1b93..dcabc5739be5 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/HttpFoundationExtensionTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/HttpFoundationExtensionTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Twig\Extension\HttpFoundationExtension;
-use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\Routing\RequestContext;
 
 class HttpFoundationExtensionTest extends TestCase
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/StopwatchExtensionTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/StopwatchExtensionTest.php
index 25b2e029ee75..901425b1b94c 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/StopwatchExtensionTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/StopwatchExtensionTest.php
@@ -56,7 +56,7 @@ public function getTimingTemplates()
 
     protected function getStopwatch($events = array())
     {
-        $events = is_array($events) ? $events : array($events);
+        $events = \is_array($events) ? $events : array($events);
         $stopwatch = $this->getMockBuilder('Symfony\Component\Stopwatch\Stopwatch')->getMock();
 
         $i = -1;
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
index 88a39b1ea960..feba2b2b6b0d 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Twig\Extension\TranslationExtension;
-use Symfony\Component\Translation\Translator;
 use Symfony\Component\Translation\Loader\ArrayLoader;
+use Symfony\Component\Translation\Translator;
 use Twig\Environment;
 use Twig\Loader\ArrayLoader as TwigArrayLoader;
 
@@ -206,7 +206,7 @@ protected function getTemplate($template, $translator = null)
             $translator = new Translator('en');
         }
 
-        if (is_array($template)) {
+        if (\is_array($template)) {
             $loader = new TwigArrayLoader($template);
         } else {
             $loader = new TwigArrayLoader(array('index' => $template));
diff --git a/src/Symfony/Bridge/Twig/Tests/TokenParser/FormThemeTokenParserTest.php b/src/Symfony/Bridge/Twig/Tests/TokenParser/FormThemeTokenParserTest.php
index cd9a34cab67b..fc7af4f94de8 100644
--- a/src/Symfony/Bridge/Twig/Tests/TokenParser/FormThemeTokenParserTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/TokenParser/FormThemeTokenParserTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bridge\Twig\Tests\TokenParser;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Bridge\Twig\TokenParser\FormThemeTokenParser;
 use Symfony\Bridge\Twig\Node\FormThemeNode;
+use Symfony\Bridge\Twig\TokenParser\FormThemeTokenParser;
 use Twig\Environment;
 use Twig\Node\Expression\ArrayExpression;
 use Twig\Node\Expression\ConstantExpression;
diff --git a/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php b/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php
index 013598a40b17..8e5c84bbc987 100644
--- a/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php
@@ -90,7 +90,7 @@ public function testExtractSyntaxError($resources)
             $extractor->extract($resources, new MessageCatalogue('en'));
         } catch (Error $e) {
             if (method_exists($e, 'getSourceContext')) {
-                $this->assertSame(dirname(__DIR__).strtr('/Fixtures/extractor/syntax_error.twig', '/', DIRECTORY_SEPARATOR), $e->getFile());
+                $this->assertSame(\dirname(__DIR__).strtr('/Fixtures/extractor/syntax_error.twig', '/', \DIRECTORY_SEPARATOR), $e->getFile());
                 $this->assertSame(1, $e->getLine());
                 $this->assertSame('Unclosed "block".', $e->getMessage());
             } else {
diff --git a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TemplateFinder.php b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TemplateFinder.php
index c8a887ca5c73..eaad0f18941f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TemplateFinder.php
+++ b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TemplateFinder.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bundle\FrameworkBundle\CacheWarmer;
 
-use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\Finder\Finder;
+use Symfony\Component\HttpKernel\Bundle\BundleInterface;
+use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\Templating\TemplateNameParserInterface;
 use Symfony\Component\Templating\TemplateReferenceInterface;
-use Symfony\Component\HttpKernel\Bundle\BundleInterface;
 
 /**
  * Finds all the templates.
diff --git a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TemplatePathsCacheWarmer.php b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TemplatePathsCacheWarmer.php
index 434b883e96dd..523d7ecce0af 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TemplatePathsCacheWarmer.php
+++ b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TemplatePathsCacheWarmer.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\CacheWarmer;
 
+use Symfony\Bundle\FrameworkBundle\Templating\Loader\TemplateLocator;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmer;
-use Symfony\Bundle\FrameworkBundle\Templating\Loader\TemplateLocator;
 
 /**
  * Computes the association between template names and their paths on the disk.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Client.php b/src/Symfony/Bundle/FrameworkBundle/Client.php
index bc76ce28f0cd..899a2f40a514 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Client.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Client.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Bundle\FrameworkBundle;
 
+use Symfony\Component\BrowserKit\CookieJar;
+use Symfony\Component\BrowserKit\History;
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Symfony\Component\HttpKernel\KernelInterface;
-use Symfony\Component\HttpKernel\Client as BaseClient;
-use Symfony\Component\HttpKernel\Profiler\Profile as HttpProfile;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\BrowserKit\History;
-use Symfony\Component\BrowserKit\CookieJar;
+use Symfony\Component\HttpKernel\Client as BaseClient;
+use Symfony\Component\HttpKernel\KernelInterface;
+use Symfony\Component\HttpKernel\Profiler\Profile as HttpProfile;
 
 /**
  * Client simulates a browser and makes requests to a Kernel object.
@@ -169,7 +169,7 @@ protected function getScript($request)
         foreach (get_declared_classes() as $class) {
             if (0 === strpos($class, 'ComposerAutoloaderInit')) {
                 $r = new \ReflectionClass($class);
-                $file = dirname(dirname($r->getFileName())).'/autoload.php';
+                $file = \dirname(\dirname($r->getFileName())).'/autoload.php';
                 if (file_exists($file)) {
                     $requires .= "require_once '".str_replace("'", "\\'", $file)."';\n";
                 }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php
index b6860a24ec03..930de24466b9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php
@@ -70,7 +70,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             new TableSeparator(),
             array('<info>Kernel</>'),
             new TableSeparator(),
-            array('Type', get_class($kernel)),
+            array('Type', \get_class($kernel)),
             array('Name', $kernel->getName()),
             array('Environment', $kernel->getEnvironment()),
             array('Debug', $kernel->isDebug() ? 'true' : 'false'),
@@ -85,9 +85,9 @@ protected function execute(InputInterface $input, OutputInterface $output)
             array('Architecture', (PHP_INT_SIZE * 8).' bits'),
             array('Intl locale', class_exists('Locale', false) && \Locale::getDefault() ? \Locale::getDefault() : 'n/a'),
             array('Timezone', date_default_timezone_get().' (<comment>'.(new \DateTime())->format(\DateTime::W3C).'</>)'),
-            array('OPcache', extension_loaded('Zend OPcache') && ini_get('opcache.enable') ? 'true' : 'false'),
-            array('APCu', extension_loaded('apcu') && ini_get('apc.enabled') ? 'true' : 'false'),
-            array('Xdebug', extension_loaded('xdebug') ? 'true' : 'false'),
+            array('OPcache', \extension_loaded('Zend OPcache') && ini_get('opcache.enable') ? 'true' : 'false'),
+            array('APCu', \extension_loaded('apcu') && ini_get('apc.enabled') ? 'true' : 'false'),
+            array('Xdebug', \extension_loaded('xdebug') ? 'true' : 'false'),
         );
 
         if ($dotenv = self::getDotenvVars()) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php
index edd3e6455662..6d8960cd031e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php
@@ -109,7 +109,7 @@ public function validateConfiguration(ExtensionInterface $extension, $configurat
         }
 
         if (!$configuration instanceof ConfigurationInterface) {
-            throw new \LogicException(sprintf('Configuration class "%s" should implement ConfigurationInterface in order to be dumpable', get_class($configuration)));
+            throw new \LogicException(sprintf('Configuration class "%s" should implement ConfigurationInterface in order to be dumpable', \get_class($configuration)));
         }
     }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/AssetsInstallCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/AssetsInstallCommand.php
index 9bd9d03c9571..fe574e0ea5c2 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/AssetsInstallCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/AssetsInstallCommand.php
@@ -153,13 +153,13 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 }
 
                 if ($method === $expectedMethod) {
-                    $rows[] = array(sprintf('<fg=green;options=bold>%s</>', '\\' === DIRECTORY_SEPARATOR ? 'OK' : "\xE2\x9C\x94" /* HEAVY CHECK MARK (U+2714) */), $message, $method);
+                    $rows[] = array(sprintf('<fg=green;options=bold>%s</>', '\\' === \DIRECTORY_SEPARATOR ? 'OK' : "\xE2\x9C\x94" /* HEAVY CHECK MARK (U+2714) */), $message, $method);
                 } else {
-                    $rows[] = array(sprintf('<fg=yellow;options=bold>%s</>', '\\' === DIRECTORY_SEPARATOR ? 'WARNING' : '!'), $message, $method);
+                    $rows[] = array(sprintf('<fg=yellow;options=bold>%s</>', '\\' === \DIRECTORY_SEPARATOR ? 'WARNING' : '!'), $message, $method);
                 }
             } catch (\Exception $e) {
                 $exitCode = 1;
-                $rows[] = array(sprintf('<fg=red;options=bold>%s</>', '\\' === DIRECTORY_SEPARATOR ? 'ERROR' : "\xE2\x9C\x98" /* HEAVY BALLOT X (U+2718) */), $message, $e->getMessage());
+                $rows[] = array(sprintf('<fg=red;options=bold>%s</>', '\\' === \DIRECTORY_SEPARATOR ? 'ERROR' : "\xE2\x9C\x98" /* HEAVY BALLOT X (U+2718) */), $message, $e->getMessage());
             }
         }
         // remove the assets of the bundles that no longer exist
@@ -227,8 +227,8 @@ private function absoluteSymlinkWithFallback(string $originDir, string $targetDi
     private function symlink(string $originDir, string $targetDir, bool $relative = false)
     {
         if ($relative) {
-            $this->filesystem->mkdir(dirname($targetDir));
-            $originDir = $this->filesystem->makePathRelative($originDir, realpath(dirname($targetDir)));
+            $this->filesystem->mkdir(\dirname($targetDir));
+            $originDir = $this->filesystem->makePathRelative($originDir, realpath(\dirname($targetDir)));
         }
         $this->filesystem->symlink($originDir, $targetDir);
         if (!file_exists($targetDir)) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php
index 2dadb62116b8..2fd5e719d14a 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php
@@ -20,9 +20,9 @@
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\Filesystem\Exception\IOException;
 use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\Finder\Finder;
 use Symfony\Component\HttpKernel\CacheClearer\CacheClearerInterface;
 use Symfony\Component\HttpKernel\RebootableInterface;
-use Symfony\Component\Finder\Finder;
 
 /**
  * Clear and Warmup the cache.
@@ -95,7 +95,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $this->getApplication()->setDispatcher(new EventDispatcher());
 
         $containerDir = new \ReflectionObject($kernel->getContainer());
-        $containerDir = basename(dirname($containerDir->getFileName()));
+        $containerDir = basename(\dirname($containerDir->getFileName()));
 
         // the warmup cache dir name must have the same length as the real one
         // to avoid the many problems in serialized resources files
@@ -121,7 +121,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         if ('/' === \DIRECTORY_SEPARATOR && $mounts = @file('/proc/mounts')) {
             foreach ($mounts as $mount) {
-                $mount = array_slice(explode(' ', $mount), 1, -3);
+                $mount = \array_slice(explode(' ', $mount), 1, -3);
                 if (!\in_array(array_pop($mount), array('vboxsf', 'nfs'))) {
                     continue;
                 }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolClearCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolClearCommand.php
index a99457fee05f..e90bb65b3345 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolClearCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolClearCommand.php
@@ -14,8 +14,8 @@
 use Psr\Cache\CacheItemPoolInterface;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
-use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\HttpKernel\CacheClearer\Psr6CacheClearer;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php
index cfef89824296..7b41131b2c22 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php
@@ -12,11 +12,11 @@
 namespace Symfony\Bundle\FrameworkBundle\Command;
 
 use Symfony\Component\Config\Definition\Processor;
+use Symfony\Component\Console\Exception\LogicException;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
-use Symfony\Component\Console\Exception\LogicException;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\Yaml\Yaml;
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
index 2c6f7de2c1b2..96bcb51ba03b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Command;
 
-use Symfony\Component\Config\Definition\Dumper\YamlReferenceDumper;
 use Symfony\Component\Config\Definition\Dumper\XmlReferenceDumper;
+use Symfony\Component\Config\Definition\Dumper\YamlReferenceDumper;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerAwareCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerAwareCommand.php
index 218f816057df..2c84e7f72f39 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerAwareCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerAwareCommand.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\FrameworkBundle\Command;
 
 use Symfony\Component\Console\Command\Command;
-use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Command.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
index 9865d61e6e8e..2f3e316d183d 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
@@ -13,17 +13,17 @@
 
 use Symfony\Bundle\FrameworkBundle\Console\Helper\DescriptorHelper;
 use Symfony\Component\Config\ConfigCache;
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
-use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
-use Symfony\Component\Config\FileLocator;
 
 /**
  * A console command for retrieving information about services.
@@ -191,7 +191,7 @@ protected function getContainerBuilder()
         $kernel = $this->getApplication()->getKernel();
 
         if (!$kernel->isDebug() || !(new ConfigCache($kernel->getContainer()->getParameter('debug.container.dump'), true))->isFresh()) {
-            $buildContainer = \Closure::bind(function () { return $this->buildContainer(); }, $kernel, get_class($kernel));
+            $buildContainer = \Closure::bind(function () { return $this->buildContainer(); }, $kernel, \get_class($kernel));
             $container = $buildContainer();
             $container->getCompilerPassConfig()->setRemovingPasses(array());
             $container->compile();
@@ -213,7 +213,7 @@ private function findProperServiceName(InputInterface $input, SymfonyStyle $io,
             throw new InvalidArgumentException(sprintf('No services found that match "%s".', $name));
         }
 
-        $default = 1 === count($matchingServices) ? $matchingServices[0] : null;
+        $default = 1 === \count($matchingServices) ? $matchingServices[0] : null;
 
         return $io->choice('Select one of the following services to display its information', $matchingServices, $default);
     }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/EventDispatcherDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/EventDispatcherDebugCommand.php
index bc525f2e7342..8749f7a30f7f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/EventDispatcherDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/EventDispatcherDebugCommand.php
@@ -14,8 +14,8 @@
 use Symfony\Bundle\FrameworkBundle\Console\Helper\DescriptorHelper;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/RouterDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/RouterDebugCommand.php
index 15e27668094c..2e1b3126a681 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/RouterDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/RouterDebugCommand.php
@@ -21,8 +21,8 @@
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
-use Symfony\Component\Routing\RouterInterface;
 use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouterInterface;
 
 /**
  * A console command for retrieving information about routes.
@@ -129,7 +129,7 @@ private function extractCallable(Route $route)
         if (1 === substr_count($controller, ':')) {
             list($service, $method) = explode(':', $controller);
             try {
-                return sprintf('%s::%s', get_class($this->getApplication()->getKernel()->getContainer()->get($service)), $method);
+                return sprintf('%s::%s', \get_class($this->getApplication()->getKernel()->getContainer()->get($service)), $method);
             } catch (ServiceNotFoundException $e) {
             }
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php
index 83be4ceab81a..55d3dea128d1 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php
@@ -18,8 +18,8 @@
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
-use Symfony\Component\Routing\RouterInterface;
 use Symfony\Component\Routing\Matcher\TraceableUrlMatcher;
+use Symfony\Component\Routing\RouterInterface;
 
 /**
  * A console command to test route matching.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php
index 225269d7f18e..6172c5e0df1f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php
@@ -13,19 +13,19 @@
 
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
-use Symfony\Component\Console\Style\SymfonyStyle;
-use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\Translation\Catalogue\MergeOperation;
+use Symfony\Component\Translation\DataCollectorTranslator;
 use Symfony\Component\Translation\Extractor\ExtractorInterface;
+use Symfony\Component\Translation\LoggingTranslator;
 use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Reader\TranslationReaderInterface;
 use Symfony\Component\Translation\Translator;
-use Symfony\Component\Translation\DataCollectorTranslator;
-use Symfony\Component\Translation\LoggingTranslator;
 use Symfony\Component\Translation\TranslatorInterface;
 
 /**
@@ -219,8 +219,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
                     $states[] = self::MESSAGE_UNUSED;
                 }
 
-                if (!in_array(self::MESSAGE_UNUSED, $states) && true === $input->getOption('only-unused')
-                    || !in_array(self::MESSAGE_MISSING, $states) && true === $input->getOption('only-missing')) {
+                if (!\in_array(self::MESSAGE_UNUSED, $states) && true === $input->getOption('only-unused')
+                    || !\in_array(self::MESSAGE_MISSING, $states) && true === $input->getOption('only-missing')) {
                     continue;
                 }
 
@@ -284,7 +284,7 @@ private function sanitizeString(string $string, int $length = 40): string
             if (mb_strlen($string, $encoding) > $length) {
                 return mb_substr($string, 0, $length - 3, $encoding).'...';
             }
-        } elseif (strlen($string) > $length) {
+        } elseif (\strlen($string) > $length) {
             return substr($string, 0, $length - 3).'...';
         }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
index 3322d3230969..2802a9316c93 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
@@ -13,14 +13,14 @@
 
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\HttpKernel\KernelInterface;
-use Symfony\Component\Translation\Catalogue\TargetOperation;
 use Symfony\Component\Translation\Catalogue\MergeOperation;
-use Symfony\Component\Console\Input\InputInterface;
-use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Translation\Catalogue\TargetOperation;
 use Symfony\Component\Translation\Extractor\ExtractorInterface;
 use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Reader\TranslationReaderInterface;
@@ -111,7 +111,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         // check format
         $supportedFormats = $this->writer->getFormats();
-        if (!in_array($input->getOption('output-format'), $supportedFormats)) {
+        if (!\in_array($input->getOption('output-format'), $supportedFormats)) {
             $errorIo->error(array('Wrong output format', 'Supported formats are: '.implode(', ', $supportedFormats).'.'));
 
             return 1;
@@ -190,7 +190,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             : new MergeOperation($currentCatalogue, $extractedCatalogue);
 
         // Exit if no messages found.
-        if (!count($operation->getDomains())) {
+        if (!\count($operation->getDomains())) {
             $errorIo->warning('No translation messages were found.');
 
             return;
@@ -216,7 +216,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
                     }, array_keys($operation->getObsoleteMessages($domain)))
                 );
 
-                $domainMessagesCount = count($list);
+                $domainMessagesCount = \count($list);
 
                 $io->section(sprintf('Messages extracted for domain "<info>%s</info>" (%d message%s)', $domain, $domainMessagesCount, $domainMessagesCount > 1 ? 's' : ''));
                 $io->listing($list);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Application.php b/src/Symfony/Bundle/FrameworkBundle/Console/Application.php
index 2be849db17b1..10255a488673 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Application.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Application.php
@@ -11,18 +11,18 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Console;
 
-use Symfony\Component\Console\Output\ConsoleOutputInterface;
-use Symfony\Component\Console\Style\SymfonyStyle;
-use Symfony\Component\Debug\Exception\FatalThrowableError;
-use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\Console\Application as BaseApplication;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\ConsoleOutputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\HttpKernel\KernelInterface;
-use Symfony\Component\HttpKernel\Kernel;
+use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\Debug\Exception\FatalThrowableError;
+use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
+use Symfony\Component\HttpKernel\Kernel;
+use Symfony\Component\HttpKernel\KernelInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/Descriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/Descriptor.php
index 043b4fff6e07..be1ef79d205a 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/Descriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/Descriptor.php
@@ -71,11 +71,11 @@ public function describe(OutputInterface $output, $object, array $options = arra
             case $object instanceof EventDispatcherInterface:
                 $this->describeEventDispatcherListeners($object, $options);
                 break;
-            case is_callable($object):
+            case \is_callable($object):
                 $this->describeCallable($object, $options);
                 break;
             default:
-                throw new \InvalidArgumentException(sprintf('Object of type "%s" is not describable.', get_class($object)));
+                throw new \InvalidArgumentException(sprintf('Object of type "%s" is not describable.', \get_class($object)));
         }
     }
 
@@ -180,11 +180,11 @@ abstract protected function describeCallable($callable, array $options = array()
      */
     protected function formatValue($value)
     {
-        if (is_object($value)) {
-            return sprintf('object(%s)', get_class($value));
+        if (\is_object($value)) {
+            return sprintf('object(%s)', \get_class($value));
         }
 
-        if (is_string($value)) {
+        if (\is_string($value)) {
             return $value;
         }
 
@@ -200,7 +200,7 @@ protected function formatValue($value)
      */
     protected function formatParameter($value)
     {
-        if (is_bool($value) || is_array($value) || (null === $value)) {
+        if (\is_bool($value) || \is_array($value) || (null === $value)) {
             $jsonString = json_encode($value);
 
             if (preg_match('/^(.{60})./us', $jsonString, $matches)) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
index 7b87fcf8965c..64f2d42204f5 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/JsonDescriptor.php
@@ -90,7 +90,7 @@ protected function describeContainerService($service, array $options = array(),
         } elseif ($service instanceof Definition) {
             $this->writeData($this->getContainerDefinitionData($service, isset($options['omit_tags']) && $options['omit_tags'], isset($options['show_arguments']) && $options['show_arguments']), $options);
         } else {
-            $this->writeData(get_class($service), $options);
+            $this->writeData(\get_class($service), $options);
         }
     }
 
@@ -121,7 +121,7 @@ protected function describeContainerServices(ContainerBuilder $builder, array $o
                     $data['definitions'][$serviceId] = $this->getContainerDefinitionData($service, $omitTags, $showArguments);
                 }
             } else {
-                $data['services'][$serviceId] = get_class($service);
+                $data['services'][$serviceId] = \get_class($service);
             }
         }
 
@@ -200,7 +200,7 @@ protected function getRouteData(Route $route)
             'hostRegex' => '' !== $route->getHost() ? $route->compile()->getHostRegex() : '',
             'scheme' => $route->getSchemes() ? implode('|', $route->getSchemes()) : 'ANY',
             'method' => $route->getMethods() ? implode('|', $route->getMethods()) : 'ANY',
-            'class' => get_class($route),
+            'class' => \get_class($route),
             'defaults' => $route->getDefaults(),
             'requirements' => $route->getRequirements() ?: 'NO CUSTOM',
             'options' => $route->getOptions(),
@@ -227,7 +227,7 @@ private function getContainerDefinitionData(Definition $definition, bool $omitTa
         $data['file'] = $definition->getFile();
 
         if ($factory = $definition->getFactory()) {
-            if (is_array($factory)) {
+            if (\is_array($factory)) {
                 if ($factory[0] instanceof Reference) {
                     $data['factory_service'] = (string) $factory[0];
                 } elseif ($factory[0] instanceof Definition) {
@@ -242,7 +242,7 @@ private function getContainerDefinitionData(Definition $definition, bool $omitTa
         }
 
         $calls = $definition->getMethodCalls();
-        if (count($calls) > 0) {
+        if (\count($calls) > 0) {
             $data['calls'] = array();
             foreach ($calls as $callData) {
                 $data['calls'][] = $callData[0];
@@ -299,12 +299,12 @@ private function getCallableData($callable, array $options = array()): array
     {
         $data = array();
 
-        if (is_array($callable)) {
+        if (\is_array($callable)) {
             $data['type'] = 'function';
 
-            if (is_object($callable[0])) {
+            if (\is_object($callable[0])) {
                 $data['name'] = $callable[1];
-                $data['class'] = get_class($callable[0]);
+                $data['class'] = \get_class($callable[0]);
             } else {
                 if (0 !== strpos($callable[1], 'parent::')) {
                     $data['name'] = $callable[1];
@@ -321,7 +321,7 @@ private function getCallableData($callable, array $options = array()): array
             return $data;
         }
 
-        if (is_string($callable)) {
+        if (\is_string($callable)) {
             $data['type'] = 'function';
 
             if (false === strpos($callable, '::')) {
@@ -345,7 +345,7 @@ private function getCallableData($callable, array $options = array()): array
 
         if (method_exists($callable, '__invoke')) {
             $data['type'] = 'object';
-            $data['name'] = get_class($callable);
+            $data['name'] = \get_class($callable);
 
             return $data;
         }
@@ -355,7 +355,7 @@ private function getCallableData($callable, array $options = array()): array
 
     private function describeValue($value, $omitTags, $showArguments)
     {
-        if (is_array($value)) {
+        if (\is_array($value)) {
             $data = array();
             foreach ($value as $k => $v) {
                 $data[$k] = $this->describeValue($v, $omitTags, $showArguments);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/MarkdownDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/MarkdownDescriptor.php
index 8836cc234bfb..4e692ef763d6 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/MarkdownDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/MarkdownDescriptor.php
@@ -55,13 +55,13 @@ protected function describeRoute(Route $route, array $options = array())
             ."\n".'- Host Regex: '.('' !== $route->getHost() ? $route->compile()->getHostRegex() : '')
             ."\n".'- Scheme: '.($route->getSchemes() ? implode('|', $route->getSchemes()) : 'ANY')
             ."\n".'- Method: '.($route->getMethods() ? implode('|', $route->getMethods()) : 'ANY')
-            ."\n".'- Class: '.get_class($route)
+            ."\n".'- Class: '.\get_class($route)
             ."\n".'- Defaults: '.$this->formatRouterConfig($route->getDefaults())
             ."\n".'- Requirements: '.($route->getRequirements() ? $this->formatRouterConfig($route->getRequirements()) : 'NO CUSTOM')
             ."\n".'- Options: '.$this->formatRouterConfig($route->getOptions());
 
         $this->write(isset($options['name'])
-            ? $options['name']."\n".str_repeat('-', strlen($options['name']))."\n\n".$output
+            ? $options['name']."\n".str_repeat('-', \strlen($options['name']))."\n\n".$output
             : $output);
         $this->write("\n");
     }
@@ -86,7 +86,7 @@ protected function describeContainerTags(ContainerBuilder $builder, array $optio
         $this->write("Container tags\n==============");
 
         foreach ($this->findDefinitionsByTag($builder, $showPrivate) as $tag => $definitions) {
-            $this->write("\n\n".$tag."\n".str_repeat('-', strlen($tag)));
+            $this->write("\n\n".$tag."\n".str_repeat('-', \strlen($tag)));
             foreach ($definitions as $serviceId => $definition) {
                 $this->write("\n\n");
                 $this->describeContainerDefinition($definition, array('omit_tags' => true, 'id' => $serviceId));
@@ -110,7 +110,7 @@ protected function describeContainerService($service, array $options = array(),
         } elseif ($service instanceof Definition) {
             $this->describeContainerDefinition($service, $childOptions);
         } else {
-            $this->write(sprintf('**`%s`:** `%s`', $options['id'], get_class($service)));
+            $this->write(sprintf('**`%s`:** `%s`', $options['id'], \get_class($service)));
         }
     }
 
@@ -125,7 +125,7 @@ protected function describeContainerServices(ContainerBuilder $builder, array $o
         if (isset($options['tag'])) {
             $title .= ' with tag `'.$options['tag'].'`';
         }
-        $this->write($title."\n".str_repeat('=', strlen($title)));
+        $this->write($title."\n".str_repeat('=', \strlen($title)));
 
         $serviceIds = isset($options['tag']) && $options['tag'] ? array_keys($builder->findTaggedServiceIds($options['tag'])) : $builder->getServiceIds();
         $showArguments = isset($options['show_arguments']) && $options['show_arguments'];
@@ -171,7 +171,7 @@ protected function describeContainerServices(ContainerBuilder $builder, array $o
             $this->write("\n\nServices\n--------\n");
             foreach ($services['services'] as $id => $service) {
                 $this->write("\n");
-                $this->write(sprintf('- `%s`: `%s`', $id, get_class($service)));
+                $this->write(sprintf('- `%s`: `%s`', $id, \get_class($service)));
             }
         }
     }
@@ -200,7 +200,7 @@ protected function describeContainerDefinition(Definition $definition, array $op
         }
 
         if ($factory = $definition->getFactory()) {
-            if (is_array($factory)) {
+            if (\is_array($factory)) {
                 if ($factory[0] instanceof Reference) {
                     $output .= "\n".'- Factory Service: `'.$factory[0].'`';
                 } elseif ($factory[0] instanceof Definition) {
@@ -260,7 +260,7 @@ protected function describeContainerAlias(Alias $alias, array $options = array()
      */
     protected function describeContainerParameter($parameter, array $options = array())
     {
-        $this->write(isset($options['parameter']) ? sprintf("%s\n%s\n\n%s", $options['parameter'], str_repeat('=', strlen($options['parameter'])), $this->formatParameter($parameter)) : $parameter);
+        $this->write(isset($options['parameter']) ? sprintf("%s\n%s\n\n%s", $options['parameter'], str_repeat('=', \strlen($options['parameter'])), $this->formatParameter($parameter)) : $parameter);
     }
 
     /**
@@ -306,12 +306,12 @@ protected function describeCallable($callable, array $options = array())
     {
         $string = '';
 
-        if (is_array($callable)) {
+        if (\is_array($callable)) {
             $string .= "\n- Type: `function`";
 
-            if (is_object($callable[0])) {
+            if (\is_object($callable[0])) {
                 $string .= "\n".sprintf('- Name: `%s`', $callable[1]);
-                $string .= "\n".sprintf('- Class: `%s`', get_class($callable[0]));
+                $string .= "\n".sprintf('- Class: `%s`', \get_class($callable[0]));
             } else {
                 if (0 !== strpos($callable[1], 'parent::')) {
                     $string .= "\n".sprintf('- Name: `%s`', $callable[1]);
@@ -328,7 +328,7 @@ protected function describeCallable($callable, array $options = array())
             return $this->write($string."\n");
         }
 
-        if (is_string($callable)) {
+        if (\is_string($callable)) {
             $string .= "\n- Type: `function`";
 
             if (false === strpos($callable, '::')) {
@@ -352,7 +352,7 @@ protected function describeCallable($callable, array $options = array())
 
         if (method_exists($callable, '__invoke')) {
             $string .= "\n- Type: `object`";
-            $string .= "\n".sprintf('- Name: `%s`', get_class($callable));
+            $string .= "\n".sprintf('- Name: `%s`', \get_class($callable));
 
             return $this->write($string."\n");
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php
index 9d35151dd4d6..9498005deaf6 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php
@@ -58,8 +58,8 @@ protected function describeRouteCollection(RouteCollection $routes, array $optio
                 $controller = $route->getDefault('_controller');
                 if ($controller instanceof \Closure) {
                     $controller = 'Closure';
-                } elseif (is_object($controller)) {
-                    $controller = get_class($controller);
+                } elseif (\is_object($controller)) {
+                    $controller = \get_class($controller);
                 }
                 $row[] = $controller;
             }
@@ -91,7 +91,7 @@ protected function describeRoute(Route $route, array $options = array())
             array('Scheme', ($route->getSchemes() ? implode('|', $route->getSchemes()) : 'ANY')),
             array('Method', ($route->getMethods() ? implode('|', $route->getMethods()) : 'ANY')),
             array('Requirements', ($route->getRequirements() ? $this->formatRouterConfig($route->getRequirements()) : 'NO CUSTOM')),
-            array('Class', get_class($route)),
+            array('Class', \get_class($route)),
             array('Defaults', $this->formatRouterConfig($route->getDefaults())),
             array('Options', $this->formatRouterConfig($route->getOptions())),
         );
@@ -157,7 +157,7 @@ protected function describeContainerService($service, array $options = array(),
             $options['output']->table(
                 array('Service ID', 'Class'),
                 array(
-                    array(isset($options['id']) ? $options['id'] : '-', get_class($service)),
+                    array(isset($options['id']) ? $options['id'] : '-', \get_class($service)),
                 )
             );
         }
@@ -203,10 +203,10 @@ protected function describeContainerServices(ContainerBuilder $builder, array $o
                     foreach ($tags as $tag) {
                         foreach ($tag as $key => $value) {
                             if (!isset($maxTags[$key])) {
-                                $maxTags[$key] = strlen($key);
+                                $maxTags[$key] = \strlen($key);
                             }
-                            if (strlen($value) > $maxTags[$key]) {
-                                $maxTags[$key] = strlen($value);
+                            if (\strlen($value) > $maxTags[$key]) {
+                                $maxTags[$key] = \strlen($value);
                             }
                         }
                     }
@@ -219,7 +219,7 @@ protected function describeContainerServices(ContainerBuilder $builder, array $o
             }
         }
 
-        $tagsCount = count($maxTags);
+        $tagsCount = \count($maxTags);
         $tagsNames = array_keys($maxTags);
 
         $tableHeaders = array_merge(array('Service ID'), $tagsNames, array('Class name'));
@@ -249,7 +249,7 @@ protected function describeContainerServices(ContainerBuilder $builder, array $o
                 $alias = $definition;
                 $tableRows[] = array_merge(array($styledServiceId, sprintf('alias for "%s"', $alias)), $tagsCount ? array_fill(0, $tagsCount, '') : array());
             } else {
-                $tableRows[] = array_merge(array($styledServiceId, get_class($definition)), $tagsCount ? array_fill(0, $tagsCount, '') : array());
+                $tableRows[] = array_merge(array($styledServiceId, \get_class($definition)), $tagsCount ? array_fill(0, $tagsCount, '') : array());
             }
         }
 
@@ -294,7 +294,7 @@ protected function describeContainerDefinition(Definition $definition, array $op
         $tableRows[] = array('Tags', $tagInformation);
 
         $calls = $definition->getMethodCalls();
-        if (count($calls) > 0) {
+        if (\count($calls) > 0) {
             $callInformation = array();
             foreach ($calls as $call) {
                 $callInformation[] = $call[0];
@@ -315,7 +315,7 @@ protected function describeContainerDefinition(Definition $definition, array $op
         }
 
         if ($factory = $definition->getFactory()) {
-            if (is_array($factory)) {
+            if (\is_array($factory)) {
                 if ($factory[0] instanceof Reference) {
                     $tableRows[] = array('Factory Service', $factory[0]);
                 } elseif ($factory[0] instanceof Definition) {
@@ -339,11 +339,11 @@ protected function describeContainerDefinition(Definition $definition, array $op
                 if ($argument instanceof Reference) {
                     $argumentsInformation[] = sprintf('Service(%s)', (string) $argument);
                 } elseif ($argument instanceof IteratorArgument) {
-                    $argumentsInformation[] = sprintf('Iterator (%d element(s))', count($argument->getValues()));
+                    $argumentsInformation[] = sprintf('Iterator (%d element(s))', \count($argument->getValues()));
                 } elseif ($argument instanceof Definition) {
                     $argumentsInformation[] = 'Inlined Service';
                 } else {
-                    $argumentsInformation[] = is_array($argument) ? sprintf('Array (%d element(s))', count($argument)) : $argument;
+                    $argumentsInformation[] = \is_array($argument) ? sprintf('Array (%d element(s))', \count($argument)) : $argument;
                 }
             }
 
@@ -446,15 +446,15 @@ private function formatRouterConfig(array $config): string
 
     private function formatCallable($callable): string
     {
-        if (is_array($callable)) {
-            if (is_object($callable[0])) {
-                return sprintf('%s::%s()', get_class($callable[0]), $callable[1]);
+        if (\is_array($callable)) {
+            if (\is_object($callable[0])) {
+                return sprintf('%s::%s()', \get_class($callable[0]), $callable[1]);
             }
 
             return sprintf('%s::%s()', $callable[0], $callable[1]);
         }
 
-        if (is_string($callable)) {
+        if (\is_string($callable)) {
             return sprintf('%s()', $callable);
         }
 
@@ -463,7 +463,7 @@ private function formatCallable($callable): string
         }
 
         if (method_exists($callable, '__invoke')) {
-            return sprintf('%s::__invoke()', get_class($callable));
+            return sprintf('%s::__invoke()', \get_class($callable));
         }
 
         throw new \InvalidArgumentException('Callable is not describable.');
diff --git a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/XmlDescriptor.php b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/XmlDescriptor.php
index 1e3148db9a69..f30028c3614b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/XmlDescriptor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/XmlDescriptor.php
@@ -163,7 +163,7 @@ private function getRouteDocument(Route $route, string $name = null): \DOMDocume
             $routeXML->setAttribute('name', $name);
         }
 
-        $routeXML->setAttribute('class', get_class($route));
+        $routeXML->setAttribute('class', \get_class($route));
 
         $routeXML->appendChild($pathXML = $dom->createElement('path'));
         $pathXML->setAttribute('regex', $route->compile()->getRegex());
@@ -263,7 +263,7 @@ private function getContainerServiceDocument($service, string $id, ContainerBuil
         } else {
             $dom->appendChild($serviceXML = $dom->createElement('service'));
             $serviceXML->setAttribute('id', $id);
-            $serviceXML->setAttribute('class', get_class($service));
+            $serviceXML->setAttribute('class', \get_class($service));
         }
 
         return $dom;
@@ -308,7 +308,7 @@ private function getContainerDefinitionDocument(Definition $definition, string $
         if ($factory = $definition->getFactory()) {
             $serviceXML->appendChild($factoryXML = $dom->createElement('factory'));
 
-            if (is_array($factory)) {
+            if (\is_array($factory)) {
                 if ($factory[0] instanceof Reference) {
                     $factoryXML->setAttribute('service', (string) $factory[0]);
                 } elseif ($factory[0] instanceof Definition) {
@@ -332,7 +332,7 @@ private function getContainerDefinitionDocument(Definition $definition, string $
         $serviceXML->setAttribute('file', $definition->getFile());
 
         $calls = $definition->getMethodCalls();
-        if (count($calls) > 0) {
+        if (\count($calls) > 0) {
             $serviceXML->appendChild($callsXML = $dom->createElement('calls'));
             foreach ($calls as $callData) {
                 $callsXML->appendChild($callXML = $dom->createElement('call'));
@@ -376,7 +376,7 @@ private function getArgumentNodes(array $arguments, \DOMDocument $dom)
         foreach ($arguments as $argumentKey => $argument) {
             $argumentXML = $dom->createElement('argument');
 
-            if (is_string($argumentKey)) {
+            if (\is_string($argumentKey)) {
                 $argumentXML->setAttribute('key', $argumentKey);
             }
 
@@ -395,7 +395,7 @@ private function getArgumentNodes(array $arguments, \DOMDocument $dom)
                 }
             } elseif ($argument instanceof Definition) {
                 $argumentXML->appendChild($dom->importNode($this->getContainerDefinitionDocument($argument, null, false, true)->childNodes->item(0), true));
-            } elseif (is_array($argument)) {
+            } elseif (\is_array($argument)) {
                 $argumentXML->setAttribute('type', 'collection');
 
                 foreach ($this->getArgumentNodes($argument, $dom) as $childArgumenXML) {
@@ -477,12 +477,12 @@ private function getCallableDocument($callable): \DOMDocument
         $dom = new \DOMDocument('1.0', 'UTF-8');
         $dom->appendChild($callableXML = $dom->createElement('callable'));
 
-        if (is_array($callable)) {
+        if (\is_array($callable)) {
             $callableXML->setAttribute('type', 'function');
 
-            if (is_object($callable[0])) {
+            if (\is_object($callable[0])) {
                 $callableXML->setAttribute('name', $callable[1]);
-                $callableXML->setAttribute('class', get_class($callable[0]));
+                $callableXML->setAttribute('class', \get_class($callable[0]));
             } else {
                 if (0 !== strpos($callable[1], 'parent::')) {
                     $callableXML->setAttribute('name', $callable[1]);
@@ -499,7 +499,7 @@ private function getCallableDocument($callable): \DOMDocument
             return $dom;
         }
 
-        if (is_string($callable)) {
+        if (\is_string($callable)) {
             $callableXML->setAttribute('type', 'function');
 
             if (false === strpos($callable, '::')) {
@@ -523,7 +523,7 @@ private function getCallableDocument($callable): \DOMDocument
 
         if (method_exists($callable, '__invoke')) {
             $callableXML->setAttribute('type', 'object');
-            $callableXML->setAttribute('name', get_class($callable));
+            $callableXML->setAttribute('name', \get_class($callable));
 
             return $dom;
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php b/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php
index 3ba3b8471edc..b2c72fa6f599 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Controller;
 
-use Psr\Container\ContainerInterface;
 use Doctrine\Common\Persistence\ManagerRegistry;
+use Psr\Container\ContainerInterface;
 use Symfony\Component\DependencyInjection\ServiceSubscriberInterface;
 use Symfony\Component\Form\FormFactoryInterface;
 use Symfony\Component\HttpFoundation\RequestStack;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerNameParser.php b/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerNameParser.php
index 21b13f91e8cc..64b6b61c92e0 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerNameParser.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerNameParser.php
@@ -42,7 +42,7 @@ public function __construct(KernelInterface $kernel)
     public function parse($controller)
     {
         $parts = explode(':', $controller);
-        if (3 !== count($parts) || in_array('', $parts, true)) {
+        if (3 !== \count($parts) || \in_array('', $parts, true)) {
             throw new \InvalidArgumentException(sprintf('The "%s" controller is not a valid "a:b:c" controller string.', $controller));
         }
 
@@ -122,7 +122,7 @@ private function findAlternative(string $nonExistentBundleName): ?string
             }
 
             $lev = levenshtein($nonExistentBundleName, $bundleName);
-            if ($lev <= strlen($nonExistentBundleName) / 3 && (null === $alternative || $lev < $shortest)) {
+            if ($lev <= \strlen($nonExistentBundleName) / 3 && (null === $alternative || $lev < $shortest)) {
                 $alternative = $bundleName;
                 $shortest = $lev;
             }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerResolver.php b/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerResolver.php
index f0ac2a248fae..e7ba82c71d60 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerResolver.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerResolver.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\FrameworkBundle\Controller;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpKernel\Controller\ContainerControllerResolver;
 
 /**
@@ -42,7 +42,7 @@ protected function createController($controller)
 
         $resolvedController = parent::createController($controller);
 
-        if (1 === substr_count($controller, ':') && is_array($resolvedController)) {
+        if (1 === substr_count($controller, ':') && \is_array($resolvedController)) {
             $resolvedController[0] = $this->configureController($resolvedController[0]);
         }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerTrait.php b/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerTrait.php
index 69639f65d65a..ae308da03489 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerTrait.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerTrait.php
@@ -13,20 +13,20 @@
 
 use Doctrine\Common\Persistence\ManagerRegistry;
 use Psr\Container\ContainerInterface;
+use Symfony\Component\Form\Extension\Core\Type\FormType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormInterface;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\JsonResponse;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\ResponseHeaderBag;
 use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\Component\Security\Core\Exception\AccessDeniedException;
 use Symfony\Component\Security\Csrf\CsrfToken;
-use Symfony\Component\Form\Extension\Core\Type\FormType;
-use Symfony\Component\Form\FormInterface;
-use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 
 /**
  * Common features needed in controllers.
@@ -359,7 +359,7 @@ protected function getUser()
             return;
         }
 
-        if (!is_object($user = $token->getUser())) {
+        if (!\is_object($user = $token->getUser())) {
             // e.g. anonymous authentication
             return;
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Controller/RedirectController.php b/src/Symfony/Bundle/FrameworkBundle/Controller/RedirectController.php
index 37430d6ef7ce..e4a17470b81d 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Controller/RedirectController.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Controller/RedirectController.php
@@ -60,7 +60,7 @@ public function redirectAction(Request $request, string $route, bool $permanent
         }
 
         $attributes = array();
-        if (false === $ignoreAttributes || is_array($ignoreAttributes)) {
+        if (false === $ignoreAttributes || \is_array($ignoreAttributes)) {
             $attributes = $request->attributes->get('_route_params');
             unset($attributes['route'], $attributes['permanent'], $attributes['ignoreAttributes']);
             if ($ignoreAttributes) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/DataCollector/RequestDataCollector.php b/src/Symfony/Bundle/FrameworkBundle/DataCollector/RequestDataCollector.php
index 55355bdee705..f71fc83941bf 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DataCollector/RequestDataCollector.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DataCollector/RequestDataCollector.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Bundle\FrameworkBundle\DataCollector;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\ParameterBag;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\DataCollector\RequestDataCollector as BaseRequestCollector;
 use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * RequestDataCollector.
diff --git a/src/Symfony/Bundle/FrameworkBundle/DataCollector/RouterDataCollector.php b/src/Symfony/Bundle/FrameworkBundle/DataCollector/RouterDataCollector.php
index b7289e793dc0..90a88ca10e31 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DataCollector/RouterDataCollector.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DataCollector/RouterDataCollector.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\DataCollector;
 
-use Symfony\Component\HttpKernel\DataCollector\RouterDataCollector as BaseRouterDataCollector;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Bundle\FrameworkBundle\Controller\RedirectController;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\DataCollector\RouterDataCollector as BaseRouterDataCollector;
 
 /**
  * RouterDataCollector.
@@ -24,7 +24,7 @@ class RouterDataCollector extends BaseRouterDataCollector
 {
     public function guessRoute(Request $request, $controller)
     {
-        if (is_array($controller)) {
+        if (\is_array($controller)) {
             $controller = $controller[0];
         }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddDebugLogProcessorPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddDebugLogProcessorPass.php
index 4d8e5175c673..69038cf92f97 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddDebugLogProcessorPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddDebugLogProcessorPass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 
 class AddDebugLogProcessorPass implements CompilerPassInterface
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddExpressionLanguageProvidersPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddExpressionLanguageProvidersPass.php
index bceacd21ea91..a5bdfd626fae 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddExpressionLanguageProvidersPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/AddExpressionLanguageProvidersPass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 
 /**
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/CachePoolPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/CachePoolPass.php
index ae8415cb4efb..e4c55a904586 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/CachePoolPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/CachePoolPass.php
@@ -17,8 +17,8 @@
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * @author Nicolas Grekas <p@tchwork.com>
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/CachePoolPrunerPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/CachePoolPrunerPass.php
index aa80b69d6971..66d42f54e984 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/CachePoolPrunerPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/CachePoolPrunerPass.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Cache\PruneableInterface;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Reference;
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ContainerBuilderDebugDumpPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ContainerBuilderDebugDumpPass.php
index e08fda22134f..0df5420c769e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ContainerBuilderDebugDumpPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ContainerBuilderDebugDumpPass.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler;
 
 use Symfony\Component\Config\ConfigCache;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Dumper\XmlDumper;
-use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 
 /**
  * Dumps the ContainerBuilder to a cache file so that it can be used by
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/LoggingTranslatorPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/LoggingTranslatorPass.php
index ed0e811e0a7f..4945e1c12e6c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/LoggingTranslatorPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/LoggingTranslatorPass.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
-use Symfony\Component\Translation\TranslatorInterface;
 use Symfony\Component\Translation\TranslatorBagInterface;
+use Symfony\Component\Translation\TranslatorInterface;
 
 /**
  * @author Abdellatif Ait boudad <a.aitboudad@gmail.com>
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ProfilerPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ProfilerPass.php
index 28cc83dfd300..8e15979a90e3 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ProfilerPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ProfilerPass.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Adds tagged data_collector services to profiler service.
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/TemplatingPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/TemplatingPass.php
index b916a27a6d61..8de51211d379 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/TemplatingPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/TemplatingPass.php
@@ -13,8 +13,8 @@
 
 use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface as FrameworkBundleEngineInterface;
 use Symfony\Component\DependencyInjection\Alias;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\Templating\EngineInterface as ComponentEngineInterface;
 
@@ -41,7 +41,7 @@ public function process(ContainerBuilder $container)
                 }
             }
 
-            if (count($helpers) > 0) {
+            if (\count($helpers) > 0) {
                 $definition = $container->getDefinition('templating.engine.php');
                 $definition->addMethodCall('setHelpers', array($helpers));
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
index cb3366a49942..264bde0564f2 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
@@ -63,7 +63,7 @@ public function process(ContainerBuilder $container)
 
         foreach ($container->findUnusedTags() as $tag) {
             // skip whitelisted tags
-            if (in_array($tag, $this->whitelist)) {
+            if (\in_array($tag, $this->whitelist)) {
                 continue;
             }
 
@@ -74,7 +74,7 @@ public function process(ContainerBuilder $container)
                     continue;
                 }
 
-                if (false !== strpos($definedTag, $tag) || levenshtein($tag, $definedTag) <= strlen($tag) / 3) {
+                if (false !== strpos($definedTag, $tag) || levenshtein($tag, $definedTag) <= \strlen($tag) / 3) {
                     $candidates[] = $definedTag;
                 }
             }
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index cb1a86bc5007..89e66d1152de 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -216,7 +216,7 @@ private function addWorkflowSection(ArrayNodeDefinition $rootNode)
                                 $workflows = $v;
                                 unset($workflows['enabled']);
 
-                                if (1 === count($workflows) && isset($workflows[0]['enabled'])) {
+                                if (1 === \count($workflows) && isset($workflows[0]['enabled'])) {
                                     $workflows = array();
                                 }
 
@@ -455,11 +455,11 @@ private function addRequestSection(ArrayNodeDefinition $rootNode)
                             ->useAttributeAsKey('name')
                             ->prototype('array')
                                 ->beforeNormalization()
-                                    ->ifTrue(function ($v) { return is_array($v) && isset($v['mime_type']); })
+                                    ->ifTrue(function ($v) { return \is_array($v) && isset($v['mime_type']); })
                                     ->then(function ($v) { return $v['mime_type']; })
                                 ->end()
                                 ->beforeNormalization()
-                                    ->ifTrue(function ($v) { return !is_array($v); })
+                                    ->ifTrue(function ($v) { return !\is_array($v); })
                                     ->then(function ($v) { return array($v); })
                                 ->end()
                                 ->prototype('scalar')->end()
@@ -479,7 +479,7 @@ private function addTemplatingSection(ArrayNodeDefinition $rootNode)
                     ->info('templating configuration')
                     ->canBeEnabled()
                     ->beforeNormalization()
-                        ->ifTrue(function ($v) { return false === $v || is_array($v) && false === $v['enabled']; })
+                        ->ifTrue(function ($v) { return false === $v || \is_array($v) && false === $v['enabled']; })
                         ->then(function () { return array('enabled' => false, 'engines' => false); })
                     ->end()
                     ->children()
@@ -493,7 +493,7 @@ private function addTemplatingSection(ArrayNodeDefinition $rootNode)
                                     ->addDefaultChildrenIfNoneSet()
                                     ->prototype('scalar')->defaultValue('FrameworkBundle:Form')->end()
                                     ->validate()
-                                        ->ifTrue(function ($v) {return !in_array('FrameworkBundle:Form', $v); })
+                                        ->ifTrue(function ($v) {return !\in_array('FrameworkBundle:Form', $v); })
                                         ->then(function ($v) {
                                             return array_merge(array('FrameworkBundle:Form'), $v);
                                         })
@@ -510,7 +510,7 @@ private function addTemplatingSection(ArrayNodeDefinition $rootNode)
                             ->requiresAtLeastOneElement()
                             ->canBeUnset()
                             ->beforeNormalization()
-                                ->ifTrue(function ($v) { return !is_array($v) && false !== $v; })
+                                ->ifTrue(function ($v) { return !\is_array($v) && false !== $v; })
                                 ->then(function ($v) { return array($v); })
                             ->end()
                             ->prototype('scalar')->end()
@@ -520,7 +520,7 @@ private function addTemplatingSection(ArrayNodeDefinition $rootNode)
                     ->children()
                         ->arrayNode('loaders')
                             ->beforeNormalization()
-                                ->ifTrue(function ($v) { return !is_array($v); })
+                                ->ifTrue(function ($v) { return !\is_array($v); })
                                 ->then(function ($v) { return array($v); })
                              ->end()
                             ->prototype('scalar')->end()
@@ -548,7 +548,7 @@ private function addAssetsSection(ArrayNodeDefinition $rootNode)
                         ->arrayNode('base_urls')
                             ->requiresAtLeastOneElement()
                             ->beforeNormalization()
-                                ->ifTrue(function ($v) { return !is_array($v); })
+                                ->ifTrue(function ($v) { return !\is_array($v); })
                                 ->then(function ($v) { return array($v); })
                             ->end()
                             ->prototype('scalar')->end()
@@ -592,7 +592,7 @@ private function addAssetsSection(ArrayNodeDefinition $rootNode)
                                     ->arrayNode('base_urls')
                                         ->requiresAtLeastOneElement()
                                         ->beforeNormalization()
-                                            ->ifTrue(function ($v) { return !is_array($v); })
+                                            ->ifTrue(function ($v) { return !\is_array($v); })
                                             ->then(function ($v) { return array($v); })
                                         ->end()
                                         ->prototype('scalar')->end()
@@ -669,7 +669,7 @@ private function addValidationSection(ArrayNodeDefinition $rootNode)
                             ->prototype('scalar')->end()
                             ->treatFalseLike(array())
                             ->validate()
-                                ->ifTrue(function ($v) { return !is_array($v); })
+                                ->ifTrue(function ($v) { return !\is_array($v); })
                                 ->then(function ($v) { return (array) $v; })
                             ->end()
                         ->end()
@@ -846,7 +846,7 @@ private function addLockSection(ArrayNodeDefinition $rootNode)
                         ->ifString()->then(function ($v) { return array('enabled' => true, 'resources' => $v); })
                     ->end()
                     ->beforeNormalization()
-                        ->ifTrue(function ($v) { return is_array($v) && !isset($v['resources']); })
+                        ->ifTrue(function ($v) { return \is_array($v) && !isset($v['resources']); })
                         ->then(function ($v) {
                             $e = $v['enabled'];
                             unset($v['enabled']);
@@ -864,7 +864,7 @@ private function addLockSection(ArrayNodeDefinition $rootNode)
                                 ->ifString()->then(function ($v) { return array('default' => $v); })
                             ->end()
                             ->beforeNormalization()
-                                ->ifTrue(function ($v) { return is_array($v) && array_keys($v) === range(0, count($v) - 1); })
+                                ->ifTrue(function ($v) { return \is_array($v) && array_keys($v) === range(0, \count($v) - 1); })
                                 ->then(function ($v) { return array('default' => $v); })
                             ->end()
                             ->prototype('array')
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index 43e75ceef2f4..6ec5ea3fa4ee 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\DependencyInjection;
 
-use Doctrine\Common\Annotations\Reader;
 use Doctrine\Common\Annotations\AnnotationRegistry;
+use Doctrine\Common\Annotations\Reader;
 use Symfony\Bridge\Monolog\Processor\DebugProcessor;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Bundle\FrameworkBundle\Controller\Controller;
@@ -104,7 +104,7 @@ class FrameworkExtension extends Extension
      */
     public function load(array $configs, ContainerBuilder $container)
     {
-        $loader = new XmlFileLoader($container, new FileLocator(dirname(__DIR__).'/Resources/config'));
+        $loader = new XmlFileLoader($container, new FileLocator(\dirname(__DIR__).'/Resources/config'));
 
         $loader->load('web.xml');
         $loader->load('services.xml');
@@ -525,7 +525,9 @@ private function registerWorkflowConfiguration(array $config, ContainerBuilder $
             $guard = new Definition(Workflow\EventListener\GuardListener::class);
             $guard->setPrivate(true);
             $configuration = array();
-            foreach ($workflow['transitions'] as $transitionName => $config) {
+            foreach ($workflow['transitions'] as $config) {
+                $transitionName = $config['name'];
+
                 if (!isset($config['guard'])) {
                     continue;
                 }
@@ -711,7 +713,7 @@ private function registerTemplatingConfiguration(array $config, ContainerBuilder
             $loaders = array_map(function ($loader) { return new Reference($loader); }, $config['loaders']);
 
             // Use a delegation unless only a single loader was registered
-            if (1 === count($loaders)) {
+            if (1 === \count($loaders)) {
                 $container->setAlias('templating.loader', (string) reset($loaders))->setPrivate(true);
             } else {
                 $container->getDefinition('templating.loader.chain')->addArgument($loaders);
@@ -733,7 +735,7 @@ private function registerTemplatingConfiguration(array $config, ContainerBuilder
         $engines = array_map(function ($engine) { return new Reference('templating.engine.'.$engine); }, $config['engines']);
 
         // Use a delegation unless only a single engine was registered
-        if (1 === count($engines)) {
+        if (1 === \count($engines)) {
             $container->setAlias('templating', (string) reset($engines))->setPublic(true);
         } else {
             $templateEngineDefinition = $container->getDefinition('templating.engine.delegating');
@@ -749,7 +751,7 @@ private function registerTemplatingConfiguration(array $config, ContainerBuilder
         ;
 
         // configure the PHP engine if needed
-        if (in_array('php', $config['engines'], true)) {
+        if (\in_array('php', $config['engines'], true)) {
             $loader->load('templating_php.xml');
 
             $container->setParameter('templating.helper.form.resources', $config['form']['resources']);
@@ -881,17 +883,17 @@ private function registerTranslatorConfiguration(array $config, ContainerBuilder
         if (class_exists('Symfony\Component\Validator\Validation')) {
             $r = new \ReflectionClass('Symfony\Component\Validator\Validation');
 
-            $dirs[] = dirname($r->getFileName()).'/Resources/translations';
+            $dirs[] = \dirname($r->getFileName()).'/Resources/translations';
         }
         if (class_exists('Symfony\Component\Form\Form')) {
             $r = new \ReflectionClass('Symfony\Component\Form\Form');
 
-            $dirs[] = dirname($r->getFileName()).'/Resources/translations';
+            $dirs[] = \dirname($r->getFileName()).'/Resources/translations';
         }
         if (class_exists('Symfony\Component\Security\Core\Exception\AuthenticationException')) {
             $r = new \ReflectionClass('Symfony\Component\Security\Core\Exception\AuthenticationException');
 
-            $dirs[] = dirname(dirname($r->getFileName())).'/Resources/translations';
+            $dirs[] = \dirname(\dirname($r->getFileName())).'/Resources/translations';
         }
         $defaultDir = $container->getParameterBag()->resolveValue($config['default_path']);
         $rootDir = $container->getParameter('kernel.root_dir');
@@ -1007,7 +1009,7 @@ private function registerValidatorMapping(ContainerBuilder $container, array $co
 
         if (interface_exists('Symfony\Component\Form\FormInterface')) {
             $reflClass = new \ReflectionClass('Symfony\Component\Form\FormInterface');
-            $fileRecorder('xml', dirname($reflClass->getFileName()).'/Resources/config/validation.xml');
+            $fileRecorder('xml', \dirname($reflClass->getFileName()).'/Resources/config/validation.xml');
         }
 
         foreach ($container->getParameter('kernel.bundles_metadata') as $bundle) {
@@ -1189,7 +1191,7 @@ private function registerSerializerConfiguration(array $config, ContainerBuilder
         }
 
         $fileRecorder = function ($extension, $path) use (&$serializerLoaders) {
-            $definition = new Definition(in_array($extension, array('yaml', 'yml')) ? 'Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader' : 'Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader', array($path));
+            $definition = new Definition(\in_array($extension, array('yaml', 'yml')) ? 'Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader' : 'Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader', array($path));
             $definition->setPublic(false);
             $serializerLoaders[] = $definition;
         };
@@ -1263,7 +1265,7 @@ private function registerLockConfiguration(array $config, ContainerBuilder $cont
         $loader->load('lock.xml');
 
         foreach ($config['resources'] as $resourceName => $resourceStores) {
-            if (0 === count($resourceStores)) {
+            if (0 === \count($resourceStores)) {
                 continue;
             }
 
@@ -1304,7 +1306,7 @@ private function registerLockConfiguration(array $config, ContainerBuilder $cont
             }
 
             // Wrap array of stores with CombinedStore
-            if (count($storeDefinitions) > 1) {
+            if (\count($storeDefinitions) > 1) {
                 $combinedDefinition = new ChildDefinition('lock.store.combined.abstract');
                 $combinedDefinition->replaceArgument(0, $storeDefinitions);
                 $container->setDefinition('lock.'.$resourceName.'.store', $combinedDefinition);
@@ -1393,7 +1395,7 @@ private function registerCacheConfiguration(array $config, ContainerBuilder $con
      */
     public function getXsdValidationBasePath()
     {
-        return dirname(__DIR__).'/Resources/config/schema';
+        return \dirname(__DIR__).'/Resources/config/schema';
     }
 
     public function getNamespace()
diff --git a/src/Symfony/Bundle/FrameworkBundle/EventListener/ResolveControllerNameSubscriber.php b/src/Symfony/Bundle/FrameworkBundle/EventListener/ResolveControllerNameSubscriber.php
index 6072061dbac0..5fb6c3b56fda 100644
--- a/src/Symfony/Bundle/FrameworkBundle/EventListener/ResolveControllerNameSubscriber.php
+++ b/src/Symfony/Bundle/FrameworkBundle/EventListener/ResolveControllerNameSubscriber.php
@@ -33,7 +33,7 @@ public function __construct(ControllerNameParser $parser)
     public function onKernelRequest(GetResponseEvent $event)
     {
         $controller = $event->getRequest()->attributes->get('_controller');
-        if (is_string($controller) && false === strpos($controller, '::') && 2 === substr_count($controller, ':')) {
+        if (\is_string($controller) && false === strpos($controller, '::') && 2 === substr_count($controller, ':')) {
             // controller in the a:b:c notation then
             $event->getRequest()->attributes->set('_controller', $this->parser->parse($controller));
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/FrameworkBundle.php b/src/Symfony/Bundle/FrameworkBundle/FrameworkBundle.php
index 12a5bedcec82..760dd25cb337 100644
--- a/src/Symfony/Bundle/FrameworkBundle/FrameworkBundle.php
+++ b/src/Symfony/Bundle/FrameworkBundle/FrameworkBundle.php
@@ -13,38 +13,38 @@
 
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddAnnotationsCachedReaderPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddDebugLogProcessorPass;
+use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddExpressionLanguageProvidersPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\CacheCollectorPass;
-use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\CachePoolPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\CachePoolClearerPass;
+use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\CachePoolPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\CachePoolPrunerPass;
+use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\ContainerBuilderDebugDumpPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\DataCollectorTranslatorPass;
-use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\TemplatingPass;
-use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\ProfilerPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\LoggingTranslatorPass;
-use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddExpressionLanguageProvidersPass;
-use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\ContainerBuilderDebugDumpPass;
+use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\ProfilerPass;
+use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\TemplatingPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\UnusedTagsPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\WorkflowGuardListenerPass;
+use Symfony\Component\Config\Resource\ClassExistenceResource;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\DependencyInjection\AddConsoleCommandPass;
+use Symfony\Component\Debug\ErrorHandler;
+use Symfony\Component\DependencyInjection\Compiler\PassConfig;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\EventDispatcher\DependencyInjection\RegisterListenersPass;
+use Symfony\Component\Form\DependencyInjection\FormPass;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Bundle\Bundle;
 use Symfony\Component\HttpKernel\DependencyInjection\ControllerArgumentValueResolverPass;
+use Symfony\Component\HttpKernel\DependencyInjection\FragmentRendererPass;
 use Symfony\Component\HttpKernel\DependencyInjection\LoggerPass;
 use Symfony\Component\HttpKernel\DependencyInjection\RegisterControllerArgumentLocatorsPass;
 use Symfony\Component\HttpKernel\DependencyInjection\RemoveEmptyControllerArgumentLocatorsPass;
 use Symfony\Component\HttpKernel\DependencyInjection\ResettableServicePass;
+use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\PropertyInfo\DependencyInjection\PropertyInfoPass;
 use Symfony\Component\Routing\DependencyInjection\RoutingResolverPass;
 use Symfony\Component\Serializer\DependencyInjection\SerializerPass;
-use Symfony\Component\Debug\ErrorHandler;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Compiler\PassConfig;
-use Symfony\Component\EventDispatcher\DependencyInjection\RegisterListenersPass;
-use Symfony\Component\HttpKernel\DependencyInjection\FragmentRendererPass;
-use Symfony\Component\Form\DependencyInjection\FormPass;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\Bundle\Bundle;
-use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\Config\Resource\ClassExistenceResource;
 use Symfony\Component\Translation\DependencyInjection\TranslationDumperPass;
 use Symfony\Component\Translation\DependencyInjection\TranslationExtractorPass;
 use Symfony\Component\Translation\DependencyInjection\TranslatorPass;
diff --git a/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php b/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
index 6f137537cdca..1d6fce9d414c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
+++ b/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Bundle\FrameworkBundle\HttpCache;
 
-use Symfony\Component\HttpKernel\KernelInterface;
-use Symfony\Component\HttpKernel\HttpCache\HttpCache as BaseHttpCache;
-use Symfony\Component\HttpKernel\HttpCache\Esi;
-use Symfony\Component\HttpKernel\HttpCache\Store;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpCache\Esi;
+use Symfony\Component\HttpKernel\HttpCache\HttpCache as BaseHttpCache;
+use Symfony\Component\HttpKernel\HttpCache\Store;
+use Symfony\Component\HttpKernel\KernelInterface;
 
 /**
  * Manages HTTP cache objects in a Container.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php b/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
index 61944c1a5ad5..cf94ffee97d5 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
@@ -73,7 +73,7 @@ public function load($resource, $type = null)
         }
 
         foreach ($collection->all() as $route) {
-            if (!is_string($controller = $route->getDefault('_controller')) || !$controller) {
+            if (!\is_string($controller = $route->getDefault('_controller')) || !$controller) {
                 continue;
             }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
index 0148dbf73d86..f8075022b715 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
@@ -13,14 +13,14 @@
 
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\Config\ContainerParametersResource;
-use Symfony\Component\DependencyInjection\ServiceSubscriberInterface;
-use Symfony\Component\Routing\Router as BaseRouter;
-use Symfony\Component\Routing\RequestContext;
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\HttpKernel\CacheWarmer\WarmableInterface;
 use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\ServiceSubscriberInterface;
+use Symfony\Component\HttpKernel\CacheWarmer\WarmableInterface;
+use Symfony\Component\Routing\RequestContext;
+use Symfony\Component\Routing\RouteCollection;
+use Symfony\Component\Routing\Router as BaseRouter;
 
 /**
  * This Router creates the Loader only when the cache is empty.
@@ -127,7 +127,7 @@ private function resolveParameters(RouteCollection $collection)
      */
     private function resolve($value)
     {
-        if (is_array($value)) {
+        if (\is_array($value)) {
             foreach ($value as $key => $val) {
                 $value[$key] = $this->resolve($val);
             }
@@ -135,7 +135,7 @@ private function resolve($value)
             return $value;
         }
 
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             return $value;
         }
 
@@ -153,7 +153,7 @@ private function resolve($value)
 
             $resolved = $container->getParameter($match[1]);
 
-            if (is_string($resolved) || is_numeric($resolved)) {
+            if (\is_string($resolved) || is_numeric($resolved)) {
                 $this->collectedParameters[$match[1]] = $resolved;
 
                 return (string) $resolved;
@@ -164,7 +164,7 @@ private function resolve($value)
                 'must be a string or numeric, but it is of type %s.',
                 $match[1],
                 $value,
-                gettype($resolved)
+                \gettype($resolved)
                 )
             );
         }, $value);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/DelegatingEngine.php b/src/Symfony/Bundle/FrameworkBundle/Templating/DelegatingEngine.php
index 81658ffa7bac..07bf39f5b450 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/DelegatingEngine.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/DelegatingEngine.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\FrameworkBundle\Templating;
 
 use Psr\Container\ContainerInterface;
-use Symfony\Component\Templating\DelegatingEngine as BaseDelegatingEngine;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Templating\DelegatingEngine as BaseDelegatingEngine;
 
 /**
  * DelegatingEngine selects an engine for a given template.
@@ -66,7 +66,7 @@ public function renderResponse($view, array $parameters = array(), Response $res
     private function resolveEngines()
     {
         foreach ($this->engines as $i => $engine) {
-            if (is_string($engine)) {
+            if (\is_string($engine)) {
                 $this->engines[$i] = $this->container->get($engine);
             }
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/EngineInterface.php b/src/Symfony/Bundle/FrameworkBundle/Templating/EngineInterface.php
index dcf58975176b..cc0d573ee26d 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/EngineInterface.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/EngineInterface.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Templating;
 
-use Symfony\Component\Templating\EngineInterface as BaseEngineInterface;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Templating\EngineInterface as BaseEngineInterface;
 
 /**
  * EngineInterface is the interface each engine must implement.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/GlobalVariables.php b/src/Symfony/Bundle/FrameworkBundle/Templating/GlobalVariables.php
index d1daf760dc79..4e07b9b5b8be 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/GlobalVariables.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/GlobalVariables.php
@@ -49,7 +49,7 @@ public function getUser()
         }
 
         $user = $token->getUser();
-        if (!is_object($user)) {
+        if (!\is_object($user)) {
             return;
         }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/ActionsHelper.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/ActionsHelper.php
index c0879c97f059..76a6046d9b0b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/ActionsHelper.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/ActionsHelper.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Templating\Helper;
 
-use Symfony\Component\Templating\Helper\Helper;
-use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
+use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
+use Symfony\Component\Templating\Helper\Helper;
 
 /**
  * ActionsHelper manages action inclusions.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/CodeHelper.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/CodeHelper.php
index 209c77fa54fc..a1cddf2808b9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/CodeHelper.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/CodeHelper.php
@@ -85,7 +85,7 @@ public function formatArgs(array $args)
                 $short = array_pop($parts);
                 $formattedValue = sprintf('<em>object</em>(<abbr title="%s">%s</abbr>)', $item[1], $short);
             } elseif ('array' === $item[0]) {
-                $formattedValue = sprintf('<em>array</em>(%s)', is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
+                $formattedValue = sprintf('<em>array</em>(%s)', \is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
             } elseif ('string' === $item[0]) {
                 $formattedValue = sprintf("'%s'", htmlspecialchars($item[1], ENT_QUOTES, $this->getCharset()));
             } elseif ('null' === $item[0]) {
@@ -98,7 +98,7 @@ public function formatArgs(array $args)
                 $formattedValue = str_replace("\n", '', var_export(htmlspecialchars((string) $item[1], ENT_QUOTES, $this->getCharset()), true));
             }
 
-            $result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", $key, $formattedValue);
+            $result[] = \is_int($key) ? $formattedValue : sprintf("'%s' => %s", $key, $formattedValue);
         }
 
         return implode(', ', $result);
@@ -115,7 +115,7 @@ public function formatArgs(array $args)
     public function fileExcerpt($file, $line)
     {
         if (is_readable($file)) {
-            if (extension_loaded('fileinfo')) {
+            if (\extension_loaded('fileinfo')) {
                 $finfo = new \finfo();
 
                 // Check if the file is an application/octet-stream (eg. Phar file) because highlight_file cannot parse these files
@@ -132,7 +132,7 @@ public function fileExcerpt($file, $line)
             $content = explode('<br />', $code);
 
             $lines = array();
-            for ($i = max($line - 3, 1), $max = min($line + 3, count($content)); $i <= $max; ++$i) {
+            for ($i = max($line - 3, 1), $max = min($line + 3, \count($content)); $i <= $max; ++$i) {
                 $lines[] = '<li'.($i == $line ? ' class="selected"' : '').'><code>'.self::fixCodeMarkup($content[$i - 1]).'</code></li>';
             }
 
@@ -183,7 +183,7 @@ public function formatFile($file, $line, $text = null)
     public function getFileLink($file, $line)
     {
         if ($fmt = $this->fileLinkFormat) {
-            return is_string($fmt) ? strtr($fmt, array('%f' => $file, '%l' => $line)) : $fmt->format($file, $line);
+            return \is_string($fmt) ? strtr($fmt, array('%f' => $file, '%l' => $line)) : $fmt->format($file, $line);
         }
 
         return false;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/FormHelper.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/FormHelper.php
index fdaf5eef5324..4850fae1109f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/FormHelper.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/FormHelper.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Templating\Helper;
 
-use Symfony\Component\Templating\Helper\Helper;
 use Symfony\Component\Form\FormRendererInterface;
 use Symfony\Component\Form\FormView;
+use Symfony\Component\Templating\Helper\Helper;
 
 /**
  * FormHelper provides helpers to help display forms.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/RequestHelper.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/RequestHelper.php
index 694e375fb27d..3beaaada2ace 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/RequestHelper.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/RequestHelper.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Templating\Helper;
 
-use Symfony\Component\Templating\Helper\Helper;
 use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\Templating\Helper\Helper;
 
 /**
  * RequestHelper provides access to the current request parameters.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/RouterHelper.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/RouterHelper.php
index 8e4adfee1b74..683efd5974be 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/RouterHelper.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/RouterHelper.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Templating\Helper;
 
-use Symfony\Component\Templating\Helper\Helper;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Templating\Helper\Helper;
 
 /**
  * RouterHelper manages links between pages in a template context.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/SessionHelper.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/SessionHelper.php
index 15ec1a9cd176..4de6e7eec07c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/SessionHelper.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/SessionHelper.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Templating\Helper;
 
-use Symfony\Component\Templating\Helper\Helper;
 use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\Templating\Helper\Helper;
 
 /**
  * SessionHelper provides read-only access to the session attributes.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/StopwatchHelper.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/StopwatchHelper.php
index 47a9cf80ebcb..72269ec69d13 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/StopwatchHelper.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/StopwatchHelper.php
@@ -37,7 +37,7 @@ public function __call($method, $arguments = array())
     {
         if (null !== $this->stopwatch) {
             if (method_exists($this->stopwatch, $method)) {
-                return call_user_func_array(array($this->stopwatch, $method), $arguments);
+                return \call_user_func_array(array($this->stopwatch, $method), $arguments);
             }
 
             throw new \BadMethodCallException(sprintf('Method "%s" of Stopwatch does not exist', $method));
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Loader/FilesystemLoader.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Loader/FilesystemLoader.php
index 29031d03db31..4edceed8ab7e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Loader/FilesystemLoader.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Loader/FilesystemLoader.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Templating\Loader;
 
-use Symfony\Component\Templating\Storage\FileStorage;
-use Symfony\Component\Templating\Loader\LoaderInterface;
 use Symfony\Component\Config\FileLocatorInterface;
+use Symfony\Component\Templating\Loader\LoaderInterface;
+use Symfony\Component\Templating\Storage\FileStorage;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
 /**
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/PhpEngine.php b/src/Symfony/Bundle/FrameworkBundle/Templating/PhpEngine.php
index 4f1c7563cdc4..bad7c1793162 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/PhpEngine.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/PhpEngine.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bundle\FrameworkBundle\Templating;
 
 use Psr\Container\ContainerInterface;
-use Symfony\Component\Templating\PhpEngine as BasePhpEngine;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Templating\Loader\LoaderInterface;
+use Symfony\Component\Templating\PhpEngine as BasePhpEngine;
 use Symfony\Component\Templating\TemplateNameParserInterface;
-use Symfony\Component\HttpFoundation\Response;
 
 /**
  * This engine knows how to render Symfony templates.
@@ -46,7 +46,7 @@ public function get($name)
             throw new \InvalidArgumentException(sprintf('The helper "%s" is not defined.', $name));
         }
 
-        if (is_string($this->helpers[$name])) {
+        if (\is_string($this->helpers[$name])) {
             $this->helpers[$name] = $this->container->get($this->helpers[$name]);
             $this->helpers[$name]->setCharset($this->charset);
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateFilenameParser.php b/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateFilenameParser.php
index df3ab19c4d2e..b6870334c6e3 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateFilenameParser.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateFilenameParser.php
@@ -34,7 +34,7 @@ public function parse($name)
         $parts = explode('/', str_replace('\\', '/', $name));
 
         $elements = explode('.', array_pop($parts));
-        if (3 > count($elements)) {
+        if (3 > \count($elements)) {
             return false;
         }
         $engine = array_pop($elements);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateNameParser.php b/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateNameParser.php
index 9e614ca39acf..726c2a2a3043 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateNameParser.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/TemplateNameParser.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Templating;
 
-use Symfony\Component\Templating\TemplateReferenceInterface;
 use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\Templating\TemplateNameParser as BaseTemplateNameParser;
+use Symfony\Component\Templating\TemplateReferenceInterface;
 
 /**
  * TemplateNameParser converts template names from the short notation
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/TimedPhpEngine.php b/src/Symfony/Bundle/FrameworkBundle/Templating/TimedPhpEngine.php
index ec6a393ef5ad..3263ea24d0be 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/TimedPhpEngine.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/TimedPhpEngine.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\FrameworkBundle\Templating;
 
 use Psr\Container\ContainerInterface;
-use Symfony\Component\Templating\TemplateNameParserInterface;
 use Symfony\Component\Stopwatch\Stopwatch;
 use Symfony\Component\Templating\Loader\LoaderInterface;
+use Symfony\Component\Templating\TemplateNameParserInterface;
 
 /**
  * Times the time spent to render a template.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/SerializerCacheWarmerTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/SerializerCacheWarmerTest.php
index 86aee6e0cc35..fdd40d48d6fd 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/SerializerCacheWarmerTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/SerializerCacheWarmerTest.php
@@ -39,7 +39,7 @@ public function testWarmUp()
         $fallbackPool = new ArrayAdapter();
 
         $warmer = new SerializerCacheWarmer($loaders, $file, $fallbackPool);
-        $warmer->warmUp(dirname($file));
+        $warmer->warmUp(\dirname($file));
 
         $this->assertFileExists($file);
 
@@ -68,7 +68,7 @@ public function testWarmUpWithoutLoader()
         $fallbackPool = new ArrayAdapter();
 
         $warmer = new SerializerCacheWarmer(array(), $file, $fallbackPool);
-        $warmer->warmUp(dirname($file));
+        $warmer->warmUp(\dirname($file));
 
         $this->assertFileExists($file);
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/TemplateFinderTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/TemplateFinderTest.php
index a417cdae3dd9..5da592c356a6 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/TemplateFinderTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/TemplateFinderTest.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\CacheWarmer;
 
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
-use Symfony\Bundle\FrameworkBundle\Templating\TemplateFilenameParser;
 use Symfony\Bundle\FrameworkBundle\CacheWarmer\TemplateFinder;
+use Symfony\Bundle\FrameworkBundle\Templating\TemplateFilenameParser;
 use Symfony\Bundle\FrameworkBundle\Tests\Fixtures\BaseBundle\BaseBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 
 class TemplateFinderTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/TemplatePathsCacheWarmerTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/TemplatePathsCacheWarmerTest.php
index 74a33f3b4313..75d5934c7906 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/TemplatePathsCacheWarmerTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/TemplatePathsCacheWarmerTest.php
@@ -50,7 +50,7 @@ protected function setUp()
 
         $this->templateLocator = new TemplateLocator($this->fileLocator);
 
-        $this->tmpDir = sys_get_temp_dir().DIRECTORY_SEPARATOR.uniqid('cache_template_paths_', true);
+        $this->tmpDir = sys_get_temp_dir().\DIRECTORY_SEPARATOR.uniqid('cache_template_paths_', true);
 
         $this->filesystem = new Filesystem();
         $this->filesystem->mkdir($this->tmpDir);
@@ -74,7 +74,7 @@ public function testWarmUp()
             ->expects($this->once())
             ->method('locate')
             ->with($template->getPath())
-            ->will($this->returnValue(dirname($this->tmpDir).'/path/to/template.html.twig'));
+            ->will($this->returnValue(\dirname($this->tmpDir).'/path/to/template.html.twig'));
 
         $warmer = new TemplatePathsCacheWarmer($this->templateFinder, $this->templateLocator);
         $warmer->warmUp($this->tmpDir);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/ValidatorCacheWarmerTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/ValidatorCacheWarmerTest.php
index f8d3710c6d1c..47c88f1a206a 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/ValidatorCacheWarmerTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/ValidatorCacheWarmerTest.php
@@ -35,7 +35,7 @@ public function testWarmUp()
         $fallbackPool = new ArrayAdapter();
 
         $warmer = new ValidatorCacheWarmer($validatorBuilder, $file, $fallbackPool);
-        $warmer->warmUp(dirname($file));
+        $warmer->warmUp(\dirname($file));
 
         $this->assertFileExists($file);
 
@@ -64,7 +64,7 @@ public function testWarmUpWithAnnotations()
         $fallbackPool = new ArrayAdapter();
 
         $warmer = new ValidatorCacheWarmer($validatorBuilder, $file, $fallbackPool);
-        $warmer->warmUp(dirname($file));
+        $warmer->warmUp(\dirname($file));
 
         $this->assertFileExists($file);
 
@@ -93,7 +93,7 @@ public function testWarmUpWithoutLoader()
         $fallbackPool = new ArrayAdapter();
 
         $warmer = new ValidatorCacheWarmer($validatorBuilder, $file, $fallbackPool);
-        $warmer->warmUp(dirname($file));
+        $warmer->warmUp(\dirname($file));
 
         $this->assertFileExists($file);
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/CacheClearCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/CacheClearCommandTest.php
index 6ebdb1a1b4ad..1b376e51b43b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/CacheClearCommandTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/CacheClearCommandTest.php
@@ -33,7 +33,7 @@ protected function setUp()
     {
         $this->fs = new Filesystem();
         $this->kernel = new TestAppKernel('test', true);
-        $this->rootDir = sys_get_temp_dir().DIRECTORY_SEPARATOR.uniqid('sf2_cache_', true);
+        $this->rootDir = sys_get_temp_dir().\DIRECTORY_SEPARATOR.uniqid('sf2_cache_', true);
         $this->kernel->setRootDir($this->rootDir);
         $this->fs->mkdir($this->rootDir);
     }
@@ -67,7 +67,7 @@ public function testCacheIsFreshAfterCacheClearedWithWarmup()
         // check that app kernel file present in meta file of container's cache
         $containerClass = $this->kernel->getContainer()->getParameter('kernel.container_class');
         $containerRef = new \ReflectionClass($containerClass);
-        $containerFile = dirname(dirname($containerRef->getFileName())).'/'.$containerClass.'.php';
+        $containerFile = \dirname(\dirname($containerRef->getFileName())).'/'.$containerClass.'.php';
         $containerMetaFile = $containerFile.'.meta';
         $kernelRef = new \ReflectionObject($this->kernel);
         $kernelFile = $kernelRef->getFileName();
@@ -83,7 +83,7 @@ public function testCacheIsFreshAfterCacheClearedWithWarmup()
         $this->assertTrue($found, 'Kernel file should present as resource');
 
         $containerRef = new \ReflectionClass(require $containerFile);
-        $containerFile = str_replace('tes_'.DIRECTORY_SEPARATOR, 'test'.DIRECTORY_SEPARATOR, $containerRef->getFileName());
+        $containerFile = str_replace('tes_'.\DIRECTORY_SEPARATOR, 'test'.\DIRECTORY_SEPARATOR, $containerRef->getFileName());
         $this->assertRegExp(sprintf('/\'kernel.container_class\'\s*=>\s*\'%s\'/', $containerClass), file_get_contents($containerFile), 'kernel.container_class is properly set on the dumped container');
     }
 }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/Fixture/TestAppKernel.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/Fixture/TestAppKernel.php
index 18ea12ee30e2..213d75ecc6dc 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/Fixture/TestAppKernel.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/CacheClearCommand/Fixture/TestAppKernel.php
@@ -33,7 +33,7 @@ public function setRootDir($rootDir)
 
     public function registerContainerConfiguration(LoaderInterface $loader)
     {
-        $loader->load(__DIR__.DIRECTORY_SEPARATOR.'config.yml');
+        $loader->load(__DIR__.\DIRECTORY_SEPARATOR.'config.yml');
     }
 
     protected function build(ContainerBuilder $container)
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/RouterDebugCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/RouterDebugCommandTest.php
index 54fb8db8c6be..f4f7334c5ff4 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/RouterDebugCommandTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/RouterDebugCommandTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Command\RouterDebugCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
-use Symfony\Bundle\FrameworkBundle\Command\RouterDebugCommand;
 use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/RouterMatchCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/RouterMatchCommandTest.php
index 7baa874355df..2506b7102234 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/RouterMatchCommandTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/RouterMatchCommandTest.php
@@ -12,14 +12,14 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Command\RouterDebugCommand;
+use Symfony\Bundle\FrameworkBundle\Command\RouterMatchCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
-use Symfony\Bundle\FrameworkBundle\Command\RouterMatchCommand;
-use Symfony\Bundle\FrameworkBundle\Command\RouterDebugCommand;
 use Symfony\Component\HttpKernel\KernelInterface;
+use Symfony\Component\Routing\RequestContext;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\RequestContext;
 
 class RouterMatchCommandTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationDebugCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationDebugCommandTest.php
index 01e6df156a8e..1cbf574d8121 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationDebugCommandTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationDebugCommandTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Command\TranslationDebugCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
-use Symfony\Bundle\FrameworkBundle\Command\TranslationDebugCommand;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpKernel;
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationUpdateCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationUpdateCommandTest.php
index 9232b7b027e0..65b7b0d6eb49 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationUpdateCommandTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/TranslationUpdateCommandTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Command\TranslationUpdateCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Tester\CommandTester;
-use Symfony\Bundle\FrameworkBundle\Command\TranslationUpdateCommand;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpKernel;
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/YamlLintCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/YamlLintCommandTest.php
index de57b816eb4b..2daa2e322831 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Command/YamlLintCommandTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Command/YamlLintCommandTest.php
@@ -15,10 +15,10 @@
 use Symfony\Bundle\FrameworkBundle\Command\YamlLintCommand;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Component\Console\Application as BaseApplication;
-use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Tester\CommandTester;
 use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Input\InputDefinition;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Tester\CommandTester;
 use Symfony\Component\HttpKernel\KernelInterface;
 
 /**
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/ObjectsProvider.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/ObjectsProvider.php
index ce5cc7880b27..3025c6bb9e1b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/ObjectsProvider.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/ObjectsProvider.php
@@ -18,8 +18,8 @@
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\EventDispatcher\EventDispatcher;
-use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\CompiledRoute;
+use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
 
 class ObjectsProvider
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerNameParserTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerNameParserTest.php
index 0dfed269ec20..950a7fbca23e 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerNameParserTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerNameParserTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Controller;
 
 use Composer\Autoload\ClassLoader;
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Bundle\FrameworkBundle\Controller\ControllerNameParser;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\HttpKernel\Kernel;
 
 class ControllerNameParserTest extends TestCase
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerTraitTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerTraitTest.php
index a208775cf23d..f30e024b0c72 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerTraitTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerTraitTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Controller;
 
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Bundle\FrameworkBundle\Controller\ControllerTrait;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\File\File;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/RedirectControllerTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/RedirectControllerTest.php
index 4a5beeb5b8f7..48a6036b1c25 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/RedirectControllerTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Controller/RedirectControllerTest.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Controller;
 
-use Symfony\Component\HttpFoundation\Response;
+use Symfony\Bundle\FrameworkBundle\Controller\RedirectController;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\HttpFoundation\ParameterBag;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Exception\HttpException;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
-use Symfony\Bundle\FrameworkBundle\Controller\RedirectController;
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 
 /**
  * @author Marcin Sikon <marcin.sikon@gmail.com>
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddExpressionLanguageProvidersPassTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddExpressionLanguageProvidersPassTest.php
index 89ba5ff73076..7f9724bddbec 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddExpressionLanguageProvidersPassTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/AddExpressionLanguageProvidersPassTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddExpressionLanguageProvidersPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddExpressionLanguageProvidersPass;
 
 class AddExpressionLanguageProvidersPassTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/CachePoolPrunerPassTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/CachePoolPrunerPassTest.php
index ec7e6200649d..df9a49b428e7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/CachePoolPrunerPassTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/CachePoolPrunerPassTest.php
@@ -45,8 +45,8 @@ public function testCompilePassIsIgnoredIfCommandDoesNotExist()
     {
         $container = new ContainerBuilder();
 
-        $definitionsBefore = count($container->getDefinitions());
-        $aliasesBefore = count($container->getAliases());
+        $definitionsBefore = \count($container->getDefinitions());
+        $aliasesBefore = \count($container->getAliases());
 
         $pass = new CachePoolPrunerPass();
         $pass->process($container);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/LoggingTranslatorPassTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/LoggingTranslatorPassTest.php
index 2a9b3329142c..7788df0c7b4b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/LoggingTranslatorPassTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/LoggingTranslatorPassTest.php
@@ -51,8 +51,8 @@ public function testThatCompilerPassIsIgnoredIfThereIsNotLoggerDefinition()
         $container->register('identity_translator');
         $container->setAlias('translator', 'identity_translator');
 
-        $definitionsBefore = count($container->getDefinitions());
-        $aliasesBefore = count($container->getAliases());
+        $definitionsBefore = \count($container->getDefinitions());
+        $aliasesBefore = \count($container->getAliases());
 
         $pass = new LoggingTranslatorPass();
         $pass->process($container);
@@ -68,8 +68,8 @@ public function testThatCompilerPassIsIgnoredIfThereIsNotTranslatorDefinition()
         $container->register('monolog.logger');
         $container->setAlias('logger', 'monolog.logger');
 
-        $definitionsBefore = count($container->getDefinitions());
-        $aliasesBefore = count($container->getAliases());
+        $definitionsBefore = \count($container->getDefinitions());
+        $aliasesBefore = \count($container->getAliases());
 
         $pass = new LoggingTranslatorPass();
         $pass->process($container);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/ProfilerPassTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/ProfilerPassTest.php
index 9fcae720b20b..f46779ada1c1 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/ProfilerPassTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/ProfilerPassTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\ProfilerPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class ProfilerPassTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
index 8f0bd34f5b6a..9532e2ef1866 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection;
 
 use Doctrine\Common\Annotations\Annotation;
-use Symfony\Bundle\FullStack;
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddAnnotationsCachedReaderPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\FrameworkExtension;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
+use Symfony\Bundle\FullStack;
 use Symfony\Component\Cache\Adapter\AdapterInterface;
 use Symfony\Component\Cache\Adapter\ApcuAdapter;
 use Symfony\Component\Cache\Adapter\ArrayAdapter;
@@ -35,13 +35,13 @@
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\PropertyAccess\PropertyAccessor;
 use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
-use Symfony\Component\Serializer\Normalizer\DateIntervalNormalizer;
-use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader;
 use Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader;
 use Symfony\Component\Serializer\Normalizer\DataUriNormalizer;
+use Symfony\Component\Serializer\Normalizer\DateIntervalNormalizer;
 use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;
 use Symfony\Component\Serializer\Normalizer\JsonSerializableNormalizer;
+use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Translation\DependencyInjection\TranslatorPass;
 use Symfony\Component\Validator\DependencyInjection\AddConstraintValidatorsPass;
 use Symfony\Component\Workflow\Registry;
@@ -243,7 +243,7 @@ public function testWorkflows()
 
         $this->assertTrue($container->hasDefinition('workflow.registry'), 'Workflow registry is registered as a service');
         $registryDefinition = $container->getDefinition('workflow.registry');
-        $this->assertGreaterThan(0, count($registryDefinition->getMethodCalls()));
+        $this->assertGreaterThan(0, \count($registryDefinition->getMethodCalls()));
     }
 
     /**
@@ -494,29 +494,29 @@ public function testTranslator()
         $files = array_map('realpath', $options['resource_files']['en']);
         $ref = new \ReflectionClass('Symfony\Component\Validator\Validation');
         $this->assertContains(
-            strtr(dirname($ref->getFileName()).'/Resources/translations/validators.en.xlf', '/', DIRECTORY_SEPARATOR),
+            strtr(\dirname($ref->getFileName()).'/Resources/translations/validators.en.xlf', '/', \DIRECTORY_SEPARATOR),
             $files,
             '->registerTranslatorConfiguration() finds Validator translation resources'
         );
         $ref = new \ReflectionClass('Symfony\Component\Form\Form');
         $this->assertContains(
-            strtr(dirname($ref->getFileName()).'/Resources/translations/validators.en.xlf', '/', DIRECTORY_SEPARATOR),
+            strtr(\dirname($ref->getFileName()).'/Resources/translations/validators.en.xlf', '/', \DIRECTORY_SEPARATOR),
             $files,
             '->registerTranslatorConfiguration() finds Form translation resources'
         );
         $ref = new \ReflectionClass('Symfony\Component\Security\Core\Security');
         $this->assertContains(
-            strtr(dirname($ref->getFileName()).'/Resources/translations/security.en.xlf', '/', DIRECTORY_SEPARATOR),
+            strtr(\dirname($ref->getFileName()).'/Resources/translations/security.en.xlf', '/', \DIRECTORY_SEPARATOR),
             $files,
             '->registerTranslatorConfiguration() finds Security translation resources'
         );
         $this->assertContains(
-            strtr(__DIR__.'/Fixtures/translations/test_paths.en.yml', '/', DIRECTORY_SEPARATOR),
+            strtr(__DIR__.'/Fixtures/translations/test_paths.en.yml', '/', \DIRECTORY_SEPARATOR),
             $files,
             '->registerTranslatorConfiguration() finds translation resources in custom paths'
         );
         $this->assertContains(
-            strtr(__DIR__.'/translations/test_default.en.xlf', '/', DIRECTORY_SEPARATOR),
+            strtr(__DIR__.'/translations/test_default.en.xlf', '/', \DIRECTORY_SEPARATOR),
             $files,
             '->registerTranslatorConfiguration() finds translation resources in default path'
         );
@@ -564,8 +564,8 @@ public function testValidation()
 
         $ref = new \ReflectionClass('Symfony\Component\Form\Form');
         $xmlMappings = array(
-            dirname($ref->getFileName()).'/Resources/config/validation.xml',
-            strtr($projectDir.'/config/validator/foo.xml', '/', DIRECTORY_SEPARATOR),
+            \dirname($ref->getFileName()).'/Resources/config/validation.xml',
+            strtr($projectDir.'/config/validator/foo.xml', '/', \DIRECTORY_SEPARATOR),
         );
 
         $calls = $container->getDefinition('validator.builder')->getMethodCalls();
@@ -659,10 +659,10 @@ public function testValidationPaths()
         $this->assertCount(3, $xmlMappings);
         try {
             // Testing symfony/symfony
-            $this->assertStringEndsWith('Component'.DIRECTORY_SEPARATOR.'Form/Resources/config/validation.xml', $xmlMappings[0]);
+            $this->assertStringEndsWith('Component'.\DIRECTORY_SEPARATOR.'Form/Resources/config/validation.xml', $xmlMappings[0]);
         } catch (\Exception $e) {
             // Testing symfony/framework-bundle with deps=high
-            $this->assertStringEndsWith('symfony'.DIRECTORY_SEPARATOR.'form/Resources/config/validation.xml', $xmlMappings[0]);
+            $this->assertStringEndsWith('symfony'.\DIRECTORY_SEPARATOR.'form/Resources/config/validation.xml', $xmlMappings[0]);
         }
         $this->assertStringEndsWith('TestBundle/Resources/config/validation.xml', $xmlMappings[1]);
 
@@ -686,10 +686,10 @@ public function testValidationPathsUsingCustomBundlePath()
 
         try {
             // Testing symfony/symfony
-            $this->assertStringEndsWith('Component'.DIRECTORY_SEPARATOR.'Form/Resources/config/validation.xml', $xmlMappings[0]);
+            $this->assertStringEndsWith('Component'.\DIRECTORY_SEPARATOR.'Form/Resources/config/validation.xml', $xmlMappings[0]);
         } catch (\Exception $e) {
             // Testing symfony/framework-bundle with deps=high
-            $this->assertStringEndsWith('symfony'.DIRECTORY_SEPARATOR.'form/Resources/config/validation.xml', $xmlMappings[0]);
+            $this->assertStringEndsWith('symfony'.\DIRECTORY_SEPARATOR.'form/Resources/config/validation.xml', $xmlMappings[0]);
         }
         $this->assertStringEndsWith('CustomPathBundle/Resources/config/validation.xml', $xmlMappings[1]);
 
@@ -899,7 +899,7 @@ public function testSerializerMapping()
 
         foreach ($expectedLoaders as $definition) {
             if (is_file($arg = $definition->getArgument(0))) {
-                $definition->replaceArgument(0, strtr($arg, '/', DIRECTORY_SEPARATOR));
+                $definition->replaceArgument(0, strtr($arg, '/', \DIRECTORY_SEPARATOR));
             }
             $definition->setPublic(false);
         }
@@ -907,7 +907,7 @@ public function testSerializerMapping()
         $loaders = $container->getDefinition('serializer.mapping.chain_loader')->getArgument(0);
         foreach ($loaders as $loader) {
             if (is_file($arg = $loader->getArgument(0))) {
-                $loader->replaceArgument(0, strtr($arg, '/', DIRECTORY_SEPARATOR));
+                $loader->replaceArgument(0, strtr($arg, '/', \DIRECTORY_SEPARATOR));
             }
         }
         $this->assertEquals($expectedLoaders, $loaders);
@@ -1052,7 +1052,7 @@ protected function createContainer(array $data = array())
 
     protected function createContainerFromFile($file, $data = array(), $resetCompilerPasses = true, $compile = true)
     {
-        $cacheKey = md5(get_class($this).$file.serialize($data));
+        $cacheKey = md5(\get_class($this).$file.serialize($data));
         if ($compile && isset(self::$containerCache[$cacheKey])) {
             return self::$containerCache[$cacheKey];
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/PhpFrameworkExtensionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/PhpFrameworkExtensionTest.php
index b077e80dc43e..c554532c7a09 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/PhpFrameworkExtensionTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/PhpFrameworkExtensionTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection;
 
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class PhpFrameworkExtensionTest extends FrameworkExtensionTest
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/XmlFrameworkExtensionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/XmlFrameworkExtensionTest.php
index 03401e248294..ac1ba24313f8 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/XmlFrameworkExtensionTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/XmlFrameworkExtensionTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection;
 
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class XmlFrameworkExtensionTest extends FrameworkExtensionTest
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/YamlFrameworkExtensionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/YamlFrameworkExtensionTest.php
index 43070c00c983..457467aa11d7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/YamlFrameworkExtensionTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/YamlFrameworkExtensionTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection;
 
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class YamlFrameworkExtensionTest extends FrameworkExtensionTest
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/AutowiringTypesTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/AutowiringTypesTest.php
index 0a7d2391d55e..21554635c0bc 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/AutowiringTypesTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/AutowiringTypesTest.php
@@ -13,11 +13,11 @@
 
 use Doctrine\Common\Annotations\AnnotationReader;
 use Doctrine\Common\Annotations\CachedReader;
+use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface as FrameworkBundleEngineInterface;
 use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 use Symfony\Component\EventDispatcher\EventDispatcher;
-use Symfony\Component\Templating\EngineInterface as ComponentEngineInterface;
 use Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher;
-use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface as FrameworkBundleEngineInterface;
+use Symfony\Component\Templating\EngineInterface as ComponentEngineInterface;
 
 class AutowiringTypesTest extends WebTestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/AutowiringTypes/AutowiredServices.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/AutowiringTypes/AutowiredServices.php
index 7168e4902c53..a62cdf64dfa0 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/AutowiringTypes/AutowiredServices.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/AutowiringTypes/AutowiredServices.php
@@ -14,8 +14,8 @@
 use Doctrine\Common\Annotations\Reader;
 use Psr\Cache\CacheItemPoolInterface;
 use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface as FrameworkBundleEngineInterface;
-use Symfony\Component\Templating\EngineInterface;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Templating\EngineInterface;
 
 class AutowiredServices
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/AnnotatedController.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/AnnotatedController.php
index 98a3ace982e3..96543ce10f6b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/AnnotatedController.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/AnnotatedController.php
@@ -22,7 +22,7 @@ class AnnotatedController
      */
     public function requestDefaultNullAction(Request $request = null)
     {
-        return new Response($request ? get_class($request) : null);
+        return new Response($request ? \get_class($request) : null);
     }
 
     /**
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/SessionController.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/SessionController.php
index 0c82d8cc73eb..e4d856083598 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/SessionController.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/SessionController.php
@@ -13,9 +13,9 @@
 
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
+use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\RedirectResponse;
 
 class SessionController implements ContainerAwareInterface
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/TestBundle.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/TestBundle.php
index 193442ff956c..83dd4dc78191 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/TestBundle.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/TestBundle.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle;
 
-use Symfony\Component\HttpKernel\Bundle\Bundle;
-use Symfony\Component\DependencyInjection\Compiler\PassConfig;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\DependencyInjection\AnnotationReaderPass;
 use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\DependencyInjection\Config\CustomConfig;
+use Symfony\Component\DependencyInjection\Compiler\PassConfig;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\Bundle\Bundle;
 
 class TestBundle extends Bundle
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/WebTestCase.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/WebTestCase.php
index a1c50e59fdb9..b25ab8e5a61c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/WebTestCase.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/WebTestCase.php
@@ -68,6 +68,6 @@ protected static function createKernel(array $options = array())
 
     protected static function getVarDir()
     {
-        return 'FB'.substr(strrchr(get_called_class(), '\\'), 1);
+        return 'FB'.substr(strrchr(\get_called_class(), '\\'), 1);
     }
 }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AnnotatedController/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AnnotatedController/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AnnotatedController/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AnnotatedController/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AutowiringTypes/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AutowiringTypes/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AutowiringTypes/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AutowiringTypes/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/CachePoolClear/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/CachePoolClear/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/CachePoolClear/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/CachePoolClear/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/CachePools/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/CachePools/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/CachePools/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/CachePools/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ConfigDump/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ConfigDump/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ConfigDump/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ConfigDump/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDebug/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDebug/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDebug/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDebug/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDump/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDump/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDump/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ContainerDump/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ControllerServiceResolution/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ControllerServiceResolution/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ControllerServiceResolution/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/ControllerServiceResolution/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Fragment/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Fragment/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Fragment/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Fragment/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Profiler/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Profiler/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Profiler/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Profiler/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Session/bundles.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Session/bundles.php
index a73987bcc986..422ffc917fc9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Session/bundles.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Session/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\TestBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Kernel/ConcreteMicroKernel.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Kernel/ConcreteMicroKernel.php
index 1994778095d1..3c80e70220f7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Kernel/ConcreteMicroKernel.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Kernel/ConcreteMicroKernel.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Kernel;
 
 use Psr\Log\NullLogger;
-use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RedirectableUrlMatcherTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RedirectableUrlMatcherTest.php
index 438ca2538df8..b5f7a3bd4833 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RedirectableUrlMatcherTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RedirectableUrlMatcherTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Routing;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Routing\Route;
-use Symfony\Component\Routing\RouteCollection;
 use Symfony\Bundle\FrameworkBundle\Routing\RedirectableUrlMatcher;
 use Symfony\Component\Routing\RequestContext;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
 
 class RedirectableUrlMatcherTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/FormHelperDivLayoutTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/FormHelperDivLayoutTest.php
index f630ba0b45ad..e655250dbfd7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/FormHelperDivLayoutTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/FormHelperDivLayoutTest.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating\Helper;
 
-use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Extension\Templating\TemplatingExtension;
-use Symfony\Component\Form\Tests\AbstractDivLayoutTest;
+use Symfony\Bundle\FrameworkBundle\Templating\Helper\TranslatorHelper;
 use Symfony\Bundle\FrameworkBundle\Tests\Templating\Helper\Fixtures\StubTemplateNameParser;
 use Symfony\Bundle\FrameworkBundle\Tests\Templating\Helper\Fixtures\StubTranslator;
-use Symfony\Component\Templating\PhpEngine;
+use Symfony\Component\Form\Extension\Templating\TemplatingExtension;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\Form\Tests\AbstractDivLayoutTest;
 use Symfony\Component\Templating\Loader\FilesystemLoader;
-use Symfony\Bundle\FrameworkBundle\Templating\Helper\TranslatorHelper;
+use Symfony\Component\Templating\PhpEngine;
 
 class FormHelperDivLayoutTest extends AbstractDivLayoutTest
 {
@@ -32,7 +32,7 @@ protected function getExtensions()
         // should be moved to the Form component once absolute file paths are supported
         // by the default name parser in the Templating component
         $reflClass = new \ReflectionClass('Symfony\Bundle\FrameworkBundle\FrameworkBundle');
-        $root = realpath(dirname($reflClass->getFileName()).'/Resources/views');
+        $root = realpath(\dirname($reflClass->getFileName()).'/Resources/views');
         $rootTheme = realpath(__DIR__.'/Resources');
         $templateNameParser = new StubTemplateNameParser($root, $rootTheme);
         $loader = new FilesystemLoader(array());
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/FormHelperTableLayoutTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/FormHelperTableLayoutTest.php
index 8dd6fffa79f4..46c20110c7f0 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/FormHelperTableLayoutTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/FormHelperTableLayoutTest.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating\Helper;
 
-use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Extension\Templating\TemplatingExtension;
-use Symfony\Component\Form\Tests\AbstractTableLayoutTest;
+use Symfony\Bundle\FrameworkBundle\Templating\Helper\TranslatorHelper;
 use Symfony\Bundle\FrameworkBundle\Tests\Templating\Helper\Fixtures\StubTemplateNameParser;
 use Symfony\Bundle\FrameworkBundle\Tests\Templating\Helper\Fixtures\StubTranslator;
-use Symfony\Component\Templating\PhpEngine;
+use Symfony\Component\Form\Extension\Templating\TemplatingExtension;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\Form\Tests\AbstractTableLayoutTest;
 use Symfony\Component\Templating\Loader\FilesystemLoader;
-use Symfony\Bundle\FrameworkBundle\Templating\Helper\TranslatorHelper;
+use Symfony\Component\Templating\PhpEngine;
 
 class FormHelperTableLayoutTest extends AbstractTableLayoutTest
 {
@@ -56,7 +56,7 @@ protected function getExtensions()
         // should be moved to the Form component once absolute file paths are supported
         // by the default name parser in the Templating component
         $reflClass = new \ReflectionClass('Symfony\Bundle\FrameworkBundle\FrameworkBundle');
-        $root = realpath(dirname($reflClass->getFileName()).'/Resources/views');
+        $root = realpath(\dirname($reflClass->getFileName()).'/Resources/views');
         $rootTheme = realpath(__DIR__.'/Resources');
         $templateNameParser = new StubTemplateNameParser($root, $rootTheme);
         $loader = new FilesystemLoader(array());
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/RequestHelperTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/RequestHelperTest.php
index 4ece72e47e12..6795bc1a598f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/RequestHelperTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/RequestHelperTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating\Helper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Templating\Helper\RequestHelper;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
-use Symfony\Bundle\FrameworkBundle\Templating\Helper\RequestHelper;
 
 class RequestHelperTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/SessionHelperTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/SessionHelperTest.php
index f664a49b12ee..c0fc0ba0bbc6 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/SessionHelperTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/SessionHelperTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating\Helper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Templating\Helper\SessionHelper;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
-use Symfony\Bundle\FrameworkBundle\Templating\Helper\SessionHelper;
 
 class SessionHelperTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/PhpEngineTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/PhpEngineTest.php
index 2cf3d4a18d1b..9628828afaec 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/PhpEngineTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/PhpEngineTest.php
@@ -11,15 +11,15 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating;
 
+use Symfony\Bundle\FrameworkBundle\Templating\GlobalVariables;
 use Symfony\Bundle\FrameworkBundle\Templating\PhpEngine;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
 use Symfony\Component\Templating\TemplateNameParser;
-use Symfony\Bundle\FrameworkBundle\Templating\GlobalVariables;
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 
 class PhpEngineTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateFilenameParserTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateFilenameParserTest.php
index 8cdc26ecfe29..eedbcd27df3a 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateFilenameParserTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateFilenameParserTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating;
 
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Bundle\FrameworkBundle\Templating\TemplateFilenameParser;
 use Symfony\Bundle\FrameworkBundle\Templating\TemplateReference;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 
 class TemplateFilenameParserTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateNameParserTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateNameParserTest.php
index 7f7829b9c0f9..dc9dfd71a597 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateNameParserTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateNameParserTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating;
 
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Bundle\FrameworkBundle\Templating\TemplateNameParser;
 use Symfony\Bundle\FrameworkBundle\Templating\TemplateReference;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\Templating\TemplateReference as BaseTemplateReference;
 
 class TemplateNameParserTest extends TestCase
@@ -27,7 +27,7 @@ protected function setUp()
             ->expects($this->any())
             ->method('getBundle')
             ->will($this->returnCallback(function ($bundle) {
-                if (in_array($bundle, array('SensioFooBundle', 'SensioCmsFooBundle', 'FooBundle'))) {
+                if (\in_array($bundle, array('SensioFooBundle', 'SensioCmsFooBundle', 'FooBundle'))) {
                     return true;
                 }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateReferenceTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateReferenceTest.php
index 5ee2a8e8511c..35561bf52b55 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateReferenceTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateReferenceTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating;
 
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Bundle\FrameworkBundle\Templating\TemplateReference;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 
 class TemplateReferenceTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateTest.php
index 1f6f51dd3351..0321d0532f12 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TemplateTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating;
 
-use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Bundle\FrameworkBundle\Templating\TemplateReference;
+use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 
 class TemplateTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php
index ef01f0e3b815..bd02809dc017 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Templating;
 
-use Symfony\Bundle\FrameworkBundle\Templating\TimedPhpEngine;
-use Symfony\Component\DependencyInjection\Container;
 use Symfony\Bundle\FrameworkBundle\Templating\GlobalVariables;
+use Symfony\Bundle\FrameworkBundle\Templating\TimedPhpEngine;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
+use Symfony\Component\DependencyInjection\Container;
 
 class TimedPhpEngineTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
index ab65635d69e6..eeb4e0daa48d 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
@@ -14,9 +14,9 @@
 use PHPUnit\Framework\TestCase;
 use Psr\Container\ContainerInterface;
 use Symfony\Bundle\FrameworkBundle\Translation\Translator;
+use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\Translation\Formatter\MessageFormatter;
 use Symfony\Component\Translation\MessageCatalogue;
-use Symfony\Component\Filesystem\Filesystem;
 
 class TranslatorTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
index 14cb2adecfe5..bd9e92e0bf27 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
@@ -13,9 +13,9 @@
 
 use Psr\Container\ContainerInterface;
 use Symfony\Component\HttpKernel\CacheWarmer\WarmableInterface;
-use Symfony\Component\Translation\Translator as BaseTranslator;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
 use Symfony\Component\Translation\Formatter\MessageFormatterInterface;
+use Symfony\Component\Translation\Translator as BaseTranslator;
 
 /**
  * Translator.
diff --git a/src/Symfony/Bundle/SecurityBundle/Command/UserPasswordEncoderCommand.php b/src/Symfony/Bundle/SecurityBundle/Command/UserPasswordEncoderCommand.php
index 0b36054fd067..b3dccfd06522 100644
--- a/src/Symfony/Bundle/SecurityBundle/Command/UserPasswordEncoderCommand.php
+++ b/src/Symfony/Bundle/SecurityBundle/Command/UserPasswordEncoderCommand.php
@@ -147,7 +147,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $encodedPassword = $encoder->encodePassword($password, $salt);
 
         $rows = array(
-            array('Encoder used', get_class($encoder)),
+            array('Encoder used', \get_class($encoder)),
             array('Encoded password', $encodedPassword),
         );
         if (!$emptySalt) {
@@ -156,7 +156,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $io->table(array('Key', 'Value'), $rows);
 
         if (!$emptySalt) {
-            $errorIo->note(sprintf('Make sure that your salt storage field fits the salt length: %s chars', strlen($salt)));
+            $errorIo->note(sprintf('Make sure that your salt storage field fits the salt length: %s chars', \strlen($salt)));
         } elseif ($saltlessWithoutEmptySalt) {
             $errorIo->note('Self-salting encoder used: the encoder generated its own built-in salt.');
         }
@@ -195,7 +195,7 @@ private function getUserClass(InputInterface $input, SymfonyStyle $io)
             throw new RuntimeException('There are no configured encoders for the "security" extension.');
         }
 
-        if (!$input->isInteractive() || 1 === count($this->userClasses)) {
+        if (!$input->isInteractive() || 1 === \count($this->userClasses)) {
             return reset($this->userClasses);
         }
 
diff --git a/src/Symfony/Bundle/SecurityBundle/DataCollector/SecurityDataCollector.php b/src/Symfony/Bundle/SecurityBundle/DataCollector/SecurityDataCollector.php
index 2e3a085a92cf..bf7ff93327f5 100644
--- a/src/Symfony/Bundle/SecurityBundle/DataCollector/SecurityDataCollector.php
+++ b/src/Symfony/Bundle/SecurityBundle/DataCollector/SecurityDataCollector.php
@@ -12,22 +12,22 @@
 namespace Symfony\Bundle\SecurityBundle\DataCollector;
 
 use Symfony\Bundle\SecurityBundle\Debug\TraceableFirewallListener;
-use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
-use Symfony\Component\Security\Core\Role\Role;
-use Symfony\Component\Security\Core\Role\RoleHierarchyInterface;
+use Symfony\Bundle\SecurityBundle\Security\FirewallMap;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\DataCollector\DataCollector;
 use Symfony\Component\HttpKernel\DataCollector\LateDataCollectorInterface;
+use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
+use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
+use Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager;
+use Symfony\Component\Security\Core\Role\Role;
+use Symfony\Component\Security\Core\Role\RoleHierarchyInterface;
 use Symfony\Component\Security\Core\Role\SwitchUserRole;
 use Symfony\Component\Security\Http\Firewall\SwitchUserListener;
+use Symfony\Component\Security\Http\FirewallMapInterface;
 use Symfony\Component\Security\Http\Logout\LogoutUrlGenerator;
-use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
-use Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager;
 use Symfony\Component\VarDumper\Caster\ClassStub;
 use Symfony\Component\VarDumper\Cloner\Data;
-use Symfony\Component\Security\Http\FirewallMapInterface;
-use Symfony\Bundle\SecurityBundle\Security\FirewallMap;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
@@ -103,7 +103,7 @@ public function collect(Request $request, Response $response, \Exception $except
             if (null !== $this->roleHierarchy) {
                 $allRoles = $this->roleHierarchy->getReachableRoles($assignedRoles);
                 foreach ($allRoles as $role) {
-                    if (!in_array($role, $assignedRoles, true)) {
+                    if (!\in_array($role, $assignedRoles, true)) {
                         $inheritedRoles[] = $role;
                     }
                 }
@@ -125,7 +125,7 @@ public function collect(Request $request, Response $response, \Exception $except
                 'impersonator_user' => $impersonatorUser,
                 'impersonation_exit_path' => null,
                 'token' => $token,
-                'token_class' => $this->hasVarDumper ? new ClassStub(get_class($token)) : get_class($token),
+                'token_class' => $this->hasVarDumper ? new ClassStub(\get_class($token)) : \get_class($token),
                 'logout_url' => $logoutUrl,
                 'user' => $token->getUsername(),
                 'roles' => array_map(function (Role $role) { return $role->getRole(); }, $assignedRoles),
@@ -140,7 +140,7 @@ public function collect(Request $request, Response $response, \Exception $except
             $this->data['voter_strategy'] = $this->accessDecisionManager->getStrategy();
 
             foreach ($this->accessDecisionManager->getVoters() as $voter) {
-                $this->data['voters'][] = $this->hasVarDumper ? new ClassStub(get_class($voter)) : get_class($voter);
+                $this->data['voters'][] = $this->hasVarDumper ? new ClassStub(\get_class($voter)) : \get_class($voter);
             }
         } else {
             $this->data['access_decision_log'] = array();
diff --git a/src/Symfony/Bundle/SecurityBundle/Debug/WrappedListener.php b/src/Symfony/Bundle/SecurityBundle/Debug/WrappedListener.php
index 85878e219388..1715fbf1170b 100644
--- a/src/Symfony/Bundle/SecurityBundle/Debug/WrappedListener.php
+++ b/src/Symfony/Bundle/SecurityBundle/Debug/WrappedListener.php
@@ -53,7 +53,7 @@ public function handle(GetResponseEvent $event)
      */
     public function __call($method, $arguments)
     {
-        return call_user_func_array(array($this->listener, $method), $arguments);
+        return \call_user_func_array(array($this->listener, $method), $arguments);
     }
 
     public function getWrappedListener(): ListenerInterface
@@ -64,7 +64,7 @@ public function getWrappedListener(): ListenerInterface
     public function getInfo(): array
     {
         if (null === $this->stub) {
-            $this->stub = self::$hasVarDumper ? new ClassStub(get_class($this->listener)) : get_class($this->listener);
+            $this->stub = self::$hasVarDumper ? new ClassStub(\get_class($this->listener)) : \get_class($this->listener);
         }
 
         return array(
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSecurityVotersPass.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSecurityVotersPass.php
index b605879b1a43..19d88ca4370a 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSecurityVotersPass.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSecurityVotersPass.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\SecurityBundle\DependencyInjection\Compiler;
 
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\PriorityTaggedServiceTrait;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\LogicException;
 use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
 
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSessionDomainConstraintPass.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSessionDomainConstraintPass.php
index 3dd18944de9f..27098f8b1933 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSessionDomainConstraintPass.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSessionDomainConstraintPass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\SecurityBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * Uses the session domain to restrict allowed redirection targets.
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
index 74673f134147..6430193a05e9 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bundle\SecurityBundle\DependencyInjection;
 
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\AbstractFactory;
-use Symfony\Component\Security\Core\Authorization\AccessDecisionManager;
-use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
+use Symfony\Component\Security\Core\Authorization\AccessDecisionManager;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategy;
 
 /**
@@ -112,7 +112,7 @@ private function addRoleHierarchySection(ArrayNodeDefinition $rootNode)
                         ->performNoDeepMerging()
                         ->beforeNormalization()->ifString()->then(function ($v) { return array('value' => $v); })->end()
                         ->beforeNormalization()
-                            ->ifTrue(function ($v) { return is_array($v) && isset($v['value']); })
+                            ->ifTrue(function ($v) { return \is_array($v) && isset($v['value']); })
                             ->then(function ($v) { return preg_split('/\s*,\s*/', $v['value']); })
                         ->end()
                         ->prototype('scalar')->end()
@@ -217,7 +217,7 @@ private function addFirewallsSection(ArrayNodeDefinition $rootNode, array $facto
                 ->children()
                     ->arrayNode('delete_cookies')
                         ->beforeNormalization()
-                            ->ifTrue(function ($v) { return is_array($v) && is_int(key($v)); })
+                            ->ifTrue(function ($v) { return \is_array($v) && \is_int(key($v)); })
                             ->then(function ($v) { return array_map(function ($v) { return array('name' => $v); }, $v); })
                         ->end()
                         ->useAttributeAsKey('name')
@@ -343,11 +343,11 @@ private function addProvidersSection(ArrayNodeDefinition $rootNode)
 
         $providerNodeBuilder
             ->validate()
-                ->ifTrue(function ($v) { return count($v) > 1; })
+                ->ifTrue(function ($v) { return \count($v) > 1; })
                 ->thenInvalid('You cannot set multiple provider types for the same provider')
             ->end()
             ->validate()
-                ->ifTrue(function ($v) { return 0 === count($v); })
+                ->ifTrue(function ($v) { return 0 === \count($v); })
                 ->thenInvalid('You must set a provider definition for the provider.')
             ->end()
         ;
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/AbstractFactory.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/AbstractFactory.php
index 26fa75572cd9..195ef4c23a4d 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/AbstractFactory.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/AbstractFactory.php
@@ -81,7 +81,7 @@ public function addConfiguration(NodeDefinition $node)
         ;
 
         foreach (array_merge($this->options, $this->defaultSuccessHandlerOptions, $this->defaultFailureHandlerOptions) as $name => $default) {
-            if (is_bool($default)) {
+            if (\is_bool($default)) {
                 $builder->booleanNode($name)->defaultValue($default);
             } else {
                 $builder->scalarNode($name)->defaultValue($default);
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/GuardAuthenticationFactory.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/GuardAuthenticationFactory.php
index d18d2a92f06f..643f5d2fc2e4 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/GuardAuthenticationFactory.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/GuardAuthenticationFactory.php
@@ -112,7 +112,7 @@ private function determineEntryPoint($defaultEntryPointId, array $config)
         }
 
         $authenticatorIds = $config['authenticators'];
-        if (1 == count($authenticatorIds)) {
+        if (1 == \count($authenticatorIds)) {
             // if there is only one authenticator, use that as the entry point
             return array_shift($authenticatorIds);
         }
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php
index 00adb6f1c611..89b428a27d40 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/RememberMeFactory.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Config\Definition\Builder\NodeDefinition;
 use Symfony\Component\DependencyInjection\ChildDefinition;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 
 class RememberMeFactory implements SecurityFactoryInterface
 {
@@ -94,7 +94,7 @@ public function create(ContainerBuilder $container, $id, $config, $userProvider,
                 $userProviders[] = new Reference('security.user.provider.concrete.'.$providerName);
             }
         }
-        if (0 === count($userProviders)) {
+        if (0 === \count($userProviders)) {
             throw new \RuntimeException('You must configure at least one remember-me aware listener (such as form-login) for each firewall that has remember-me enabled.');
         }
 
@@ -139,7 +139,7 @@ public function addConfiguration(NodeDefinition $node)
         ;
 
         foreach ($this->options as $name => $value) {
-            if (is_bool($value)) {
+            if (\is_bool($value)) {
                 $builder->booleanNode($name)->defaultValue($value);
             } else {
                 $builder->scalarNode($name)->defaultValue($value);
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
index 719e471f2122..b8274928950b 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
@@ -14,17 +14,17 @@
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\SecurityFactoryInterface;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\UserProvider\UserProviderFactoryInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Console\Application;
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
-use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Parameter;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\Config\FileLocator;
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\Security\Core\Authorization\ExpressionLanguage;
 use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
 use Symfony\Component\Security\Core\Encoder\Argon2iPasswordEncoder;
@@ -122,7 +122,7 @@ public function load(array $configs, ContainerBuilder $container)
 
     private function createRoleHierarchy(array $config, ContainerBuilder $container)
     {
-        if (!isset($config['role_hierarchy']) || 0 === count($config['role_hierarchy'])) {
+        if (!isset($config['role_hierarchy']) || 0 === \count($config['role_hierarchy'])) {
             $container->removeDefinition('security.access.role_hierarchy_voter');
 
             return;
@@ -254,7 +254,7 @@ private function createFirewall(ContainerBuilder $container, $id, $firewall, &$a
                 throw new InvalidConfigurationException(sprintf('Invalid firewall "%s": user provider "%s" not found.', $id, $firewall['provider']));
             }
             $defaultProvider = $providerIds[$normalizedName];
-        } elseif (1 === count($providerIds)) {
+        } elseif (1 === \count($providerIds)) {
             $defaultProvider = reset($providerIds);
         }
 
@@ -317,7 +317,7 @@ private function createFirewall(ContainerBuilder $container, $id, $firewall, &$a
             }
 
             // add cookie logout handler
-            if (count($firewall['logout']['delete_cookies']) > 0) {
+            if (\count($firewall['logout']['delete_cookies']) > 0) {
                 $cookieHandlerId = 'security.logout.handler.cookie_clearing.'.$id;
                 $cookieHandler = $container->setDefinition($cookieHandlerId, new ChildDefinition('security.logout.handler.cookie_clearing'));
                 $cookieHandler->addArgument($firewall['logout']['delete_cookies']);
@@ -396,7 +396,7 @@ private function createContextListener($container, $contextKey)
             return $this->contextListeners[$contextKey];
         }
 
-        $listenerId = 'security.context_listener.'.count($this->contextListeners);
+        $listenerId = 'security.context_listener.'.\count($this->contextListeners);
         $listener = $container->setDefinition($listenerId, new ChildDefinition('security.context_listener'));
         $listener->replaceArgument(2, $contextKey);
 
@@ -659,7 +659,7 @@ private function createRequestMatcher($container, $path = null, $host = null, $m
 
         // only add arguments that are necessary
         $arguments = array($path, $host, $methods, $ip, $attributes);
-        while (count($arguments) > 0 && !end($arguments)) {
+        while (\count($arguments) > 0 && !end($arguments)) {
             array_pop($arguments);
         }
 
diff --git a/src/Symfony/Bundle/SecurityBundle/Security/FirewallConfig.php b/src/Symfony/Bundle/SecurityBundle/Security/FirewallConfig.php
index 308442810bba..795f5b3cc071 100644
--- a/src/Symfony/Bundle/SecurityBundle/Security/FirewallConfig.php
+++ b/src/Symfony/Bundle/SecurityBundle/Security/FirewallConfig.php
@@ -66,7 +66,7 @@ public function isSecurityEnabled(): bool
 
     public function allowsAnonymous(): bool
     {
-        return in_array('anonymous', $this->listeners, true);
+        return \in_array('anonymous', $this->listeners, true);
     }
 
     public function isStateless(): bool
diff --git a/src/Symfony/Bundle/SecurityBundle/Security/FirewallContext.php b/src/Symfony/Bundle/SecurityBundle/Security/FirewallContext.php
index a3b7f1540691..901d914c3113 100644
--- a/src/Symfony/Bundle/SecurityBundle/Security/FirewallContext.php
+++ b/src/Symfony/Bundle/SecurityBundle/Security/FirewallContext.php
@@ -40,7 +40,7 @@ public function __construct(iterable $listeners, ExceptionListener $exceptionLis
             $this->logoutListener = $logoutListener;
             $this->config = $config;
         } else {
-            throw new \InvalidArgumentException(sprintf('Argument 3 passed to %s() must be instance of %s or null, %s given.', __METHOD__, LogoutListener::class, is_object($logoutListener) ? get_class($logoutListener) : gettype($logoutListener)));
+            throw new \InvalidArgumentException(sprintf('Argument 3 passed to %s() must be instance of %s or null, %s given.', __METHOD__, LogoutListener::class, \is_object($logoutListener) ? \get_class($logoutListener) : \gettype($logoutListener)));
         }
     }
 
diff --git a/src/Symfony/Bundle/SecurityBundle/Security/FirewallMap.php b/src/Symfony/Bundle/SecurityBundle/Security/FirewallMap.php
index e11d5dc0f586..92539413f153 100644
--- a/src/Symfony/Bundle/SecurityBundle/Security/FirewallMap.php
+++ b/src/Symfony/Bundle/SecurityBundle/Security/FirewallMap.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\SecurityBundle\Security;
 
 use Psr\Container\ContainerInterface;
-use Symfony\Component\Security\Http\FirewallMapInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Http\FirewallMapInterface;
 
 /**
  * This is a lazy-loading firewall map implementation.
diff --git a/src/Symfony/Bundle/SecurityBundle/SecurityBundle.php b/src/Symfony/Bundle/SecurityBundle/SecurityBundle.php
index dd6dd829d749..490908317316 100644
--- a/src/Symfony/Bundle/SecurityBundle/SecurityBundle.php
+++ b/src/Symfony/Bundle/SecurityBundle/SecurityBundle.php
@@ -11,26 +11,26 @@
 
 namespace Symfony\Bundle\SecurityBundle;
 
-use Symfony\Bundle\SecurityBundle\DependencyInjection\Compiler\RegisterCsrfTokenClearingLogoutHandlerPass;
-use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\JsonLoginFactory;
-use Symfony\Component\Console\Application;
-use Symfony\Component\HttpKernel\Bundle\Bundle;
-use Symfony\Component\DependencyInjection\Compiler\PassConfig;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Compiler\AddSecurityVotersPass;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Compiler\AddSessionDomainConstraintPass;
+use Symfony\Bundle\SecurityBundle\DependencyInjection\Compiler\RegisterCsrfTokenClearingLogoutHandlerPass;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\FormLoginFactory;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\FormLoginLdapFactory;
+use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\GuardAuthenticationFactory;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\HttpBasicFactory;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\HttpBasicLdapFactory;
+use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\JsonLoginFactory;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\RememberMeFactory;
-use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\X509Factory;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\RemoteUserFactory;
-use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\SimplePreAuthenticationFactory;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\SimpleFormFactory;
+use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\SimplePreAuthenticationFactory;
+use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\X509Factory;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\UserProvider\InMemoryFactory;
-use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\GuardAuthenticationFactory;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\UserProvider\LdapFactory;
+use Symfony\Component\Console\Application;
+use Symfony\Component\DependencyInjection\Compiler\PassConfig;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\Bundle\Bundle;
 
 /**
  * Bundle.
diff --git a/src/Symfony/Bundle/SecurityBundle/Templating/Helper/SecurityHelper.php b/src/Symfony/Bundle/SecurityBundle/Templating/Helper/SecurityHelper.php
index 7df8511f8a05..337748f41b0d 100644
--- a/src/Symfony/Bundle/SecurityBundle/Templating/Helper/SecurityHelper.php
+++ b/src/Symfony/Bundle/SecurityBundle/Templating/Helper/SecurityHelper.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\SecurityBundle\Templating\Helper;
 
 use Symfony\Component\Security\Acl\Voter\FieldVote;
-use Symfony\Component\Templating\Helper\Helper;
 use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
+use Symfony\Component\Templating\Helper\Helper;
 
 /**
  * SecurityHelper provides read-only access to the security checker.
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DataCollector/SecurityDataCollectorTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DataCollector/SecurityDataCollectorTest.php
index 548b1939fc25..5e71ac6d8ae2 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DataCollector/SecurityDataCollectorTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DataCollector/SecurityDataCollectorTest.php
@@ -23,8 +23,8 @@
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\Role\Role;
 use Symfony\Component\Security\Core\Role\RoleHierarchy;
-use Symfony\Component\Security\Http\Firewall\ListenerInterface;
 use Symfony\Component\Security\Core\Role\SwitchUserRole;
+use Symfony\Component\Security\Http\Firewall\ListenerInterface;
 use Symfony\Component\Security\Http\FirewallMapInterface;
 use Symfony\Component\Security\Http\Logout\LogoutUrlGenerator;
 
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Debug/TraceableFirewallListenerTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/Debug/TraceableFirewallListenerTest.php
index 287ba531f403..854391c235cc 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Debug/TraceableFirewallListenerTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Debug/TraceableFirewallListenerTest.php
@@ -60,6 +60,6 @@ public function testOnKernelRequestRecordsListeners()
         $this->assertCount(1, $listeners);
         $this->assertSame($response, $listeners[0]['response']);
         $this->assertInstanceOf(ClassStub::class, $listeners[0]['stub']);
-        $this->assertSame(get_class($listener), (string) $listeners[0]['stub']);
+        $this->assertSame(\get_class($listener), (string) $listeners[0]['stub']);
     }
 }
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/CompleteConfigurationTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/CompleteConfigurationTest.php
index 17561d6fac93..cb54a07af45a 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/CompleteConfigurationTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/CompleteConfigurationTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Bundle\SecurityBundle\Tests\DependencyInjection;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Bundle\SecurityBundle\SecurityBundle;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\SecurityExtension;
+use Symfony\Bundle\SecurityBundle\SecurityBundle;
+use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\Security\Core\Authorization\AccessDecisionManager;
 use Symfony\Component\Security\Core\Encoder\Argon2iPasswordEncoder;
 
@@ -257,7 +257,7 @@ public function testAccess()
             $this->assertArrayNotHasKey($matcherId, $matcherIds);
             $matcherIds[$matcherId] = true;
 
-            $i = count($matcherIds);
+            $i = \count($matcherIds);
             if (1 === $i) {
                 $this->assertEquals(array('ROLE_USER'), $attributes);
                 $this->assertEquals('https', $channel);
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/PhpCompleteConfigurationTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/PhpCompleteConfigurationTest.php
index 6495485d1bb8..846d01d5337c 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/PhpCompleteConfigurationTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/PhpCompleteConfigurationTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\SecurityBundle\Tests\DependencyInjection;
 
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class PhpCompleteConfigurationTest extends CompleteConfigurationTest
 {
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Security/Factory/AbstractFactoryTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Security/Factory/AbstractFactoryTest.php
index 846d76f770d5..a367a6768230 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Security/Factory/AbstractFactoryTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Security/Factory/AbstractFactoryTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\SecurityBundle\Tests\DependencyInjection\Security\Factory;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 
 class AbstractFactoryTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/XmlCompleteConfigurationTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/XmlCompleteConfigurationTest.php
index 2399f5ee460d..00006a756a2e 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/XmlCompleteConfigurationTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/XmlCompleteConfigurationTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\SecurityBundle\Tests\DependencyInjection;
 
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class XmlCompleteConfigurationTest extends CompleteConfigurationTest
 {
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/YamlCompleteConfigurationTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/YamlCompleteConfigurationTest.php
index d5d5e693abdc..8e3954a057da 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/YamlCompleteConfigurationTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/YamlCompleteConfigurationTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\SecurityBundle\Tests\DependencyInjection;
 
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class YamlCompleteConfigurationTest extends CompleteConfigurationTest
 {
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/CsrfFormLoginBundle/Form/UserLoginType.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/CsrfFormLoginBundle/Form/UserLoginType.php
index b82e1f827897..2f4f20df3a65 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/CsrfFormLoginBundle/Form/UserLoginType.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/CsrfFormLoginBundle/Form/UserLoginType.php
@@ -14,8 +14,8 @@
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormError;
-use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 use Symfony\Component\Security\Core\Security;
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/Controller/LocalizedController.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/Controller/LocalizedController.php
index f8b4d9068f7b..33d70ef7df06 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/Controller/LocalizedController.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/Controller/LocalizedController.php
@@ -13,9 +13,9 @@
 
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
-use Symfony\Component\Security\Core\Security;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Security;
 
 class LocalizedController implements ContainerAwareInterface
 {
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/Controller/LoginController.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/Controller/LoginController.php
index 658a3cd57c24..04fe49055bef 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/Controller/LoginController.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/Controller/LoginController.php
@@ -13,9 +13,9 @@
 
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
-use Symfony\Component\Security\Core\Exception\AccessDeniedException;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
 use Symfony\Component\Security\Core\Security;
 use Symfony\Component\Security\Core\User\UserInterface;
 
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/DependencyInjection/FormLoginExtension.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/DependencyInjection/FormLoginExtension.php
index 6d5715931e1f..7cd7ad446f25 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/DependencyInjection/FormLoginExtension.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/FormLoginBundle/DependencyInjection/FormLoginExtension.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\SecurityBundle\Tests\Functional\Bundle\FormLoginBundle\DependencyInjection;
 
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\Extension;
+use Symfony\Component\DependencyInjection\Reference;
 
 class FormLoginExtension extends Extension
 {
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/UserPasswordEncoderCommandTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/UserPasswordEncoderCommandTest.php
index 13d2922c779e..4245d07687db 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/UserPasswordEncoderCommandTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/UserPasswordEncoderCommandTest.php
@@ -231,7 +231,7 @@ public function testThrowsExceptionOnNoConfiguredEncoders()
 
     protected function setUp()
     {
-        putenv('COLUMNS='.(119 + strlen(PHP_EOL)));
+        putenv('COLUMNS='.(119 + \strlen(PHP_EOL)));
         $kernel = $this->createKernel(array('test_case' => 'PasswordEncode'));
         $kernel->boot();
 
@@ -249,7 +249,7 @@ protected function tearDown()
 
     private function setupArgon2i()
     {
-        putenv('COLUMNS='.(119 + strlen(PHP_EOL)));
+        putenv('COLUMNS='.(119 + \strlen(PHP_EOL)));
         $kernel = $this->createKernel(array('test_case' => 'PasswordEncode', 'root_config' => 'argon2i.yml'));
         $kernel->boot();
 
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/WebTestCase.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/WebTestCase.php
index bb98a2a065ca..03e2f3c72c22 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/WebTestCase.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/WebTestCase.php
@@ -68,6 +68,6 @@ protected static function createKernel(array $options = array())
 
     protected static function getVarDir()
     {
-        return 'SB'.substr(strrchr(get_called_class(), '\\'), 1);
+        return 'SB'.substr(strrchr(\get_called_class(), '\\'), 1);
     }
 }
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/LogoutWithoutSessionInvalidation/bundles.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/LogoutWithoutSessionInvalidation/bundles.php
index d90f774abde2..c934b52aee7c 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/LogoutWithoutSessionInvalidation/bundles.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/LogoutWithoutSessionInvalidation/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\SecurityBundle\SecurityBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\SecurityBundle\SecurityBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/RememberMeLogout/bundles.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/RememberMeLogout/bundles.php
index d90f774abde2..c934b52aee7c 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/RememberMeLogout/bundles.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/RememberMeLogout/bundles.php
@@ -9,8 +9,8 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\SecurityBundle\SecurityBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\SecurityBundle\SecurityBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/SecurityHelper/bundles.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/SecurityHelper/bundles.php
index 2a8e7a2ff88d..05df5ef6802f 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/SecurityHelper/bundles.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/SecurityHelper/bundles.php
@@ -9,9 +9,9 @@
  * file that was distributed with this source code.
  */
 
-use Symfony\Bundle\TwigBundle\TwigBundle;
-use Symfony\Bundle\SecurityBundle\SecurityBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\SecurityBundle\SecurityBundle;
+use Symfony\Bundle\TwigBundle\TwigBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/StandardFormLogin/bundles.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/StandardFormLogin/bundles.php
index d53ff3e7eb5d..3424c1eed1ab 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/StandardFormLogin/bundles.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/app/StandardFormLogin/bundles.php
@@ -9,10 +9,10 @@
  * file that was distributed with this source code.
  */
 
+use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\SecurityBundle\SecurityBundle;
 use Symfony\Bundle\SecurityBundle\Tests\Functional\Bundle\FormLoginBundle\FormLoginBundle;
 use Symfony\Bundle\TwigBundle\TwigBundle;
-use Symfony\Bundle\SecurityBundle\SecurityBundle;
-use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
 
 return array(
     new FrameworkBundle(),
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/SecurityUserValueResolverTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/SecurityUserValueResolverTest.php
index 0f9a0fe80b64..c479e62c2e36 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/SecurityUserValueResolverTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/SecurityUserValueResolverTest.php
@@ -40,7 +40,7 @@ public function testResolveNoUser()
         $tokenStorage->setToken($token);
 
         $resolver = new SecurityUserValueResolver($tokenStorage);
-        $metadata = new ArgumentMetadata('foo', get_class($mock), false, false, null);
+        $metadata = new ArgumentMetadata('foo', \get_class($mock), false, false, null);
 
         $this->assertFalse($resolver->supports(Request::create('/'), $metadata));
     }
diff --git a/src/Symfony/Bundle/TwigBundle/CacheWarmer/TemplateCacheCacheWarmer.php b/src/Symfony/Bundle/TwigBundle/CacheWarmer/TemplateCacheCacheWarmer.php
index 4aaa9d1349c7..00964322e95e 100644
--- a/src/Symfony/Bundle/TwigBundle/CacheWarmer/TemplateCacheCacheWarmer.php
+++ b/src/Symfony/Bundle/TwigBundle/CacheWarmer/TemplateCacheCacheWarmer.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bundle\TwigBundle\CacheWarmer;
 
 use Psr\Container\ContainerInterface;
+use Symfony\Bundle\FrameworkBundle\CacheWarmer\TemplateFinderInterface;
 use Symfony\Component\DependencyInjection\ServiceSubscriberInterface;
 use Symfony\Component\Finder\Finder;
 use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
-use Symfony\Bundle\FrameworkBundle\CacheWarmer\TemplateFinderInterface;
 use Symfony\Component\Templating\TemplateReference;
 use Twig\Environment;
 use Twig\Error\Error;
diff --git a/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php b/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
index e4ad1b0daaaa..8cd7fa18bcc9 100644
--- a/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
+++ b/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\TwigBundle\Controller;
 
 use Symfony\Component\Debug\Exception\FlattenException;
-use Symfony\Component\HttpKernel\Log\DebugLoggerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Log\DebugLoggerInterface;
 use Twig\Environment;
 use Twig\Error\LoaderError;
 use Twig\Loader\ExistsLoaderInterface;
diff --git a/src/Symfony/Bundle/TwigBundle/Controller/PreviewErrorController.php b/src/Symfony/Bundle/TwigBundle/Controller/PreviewErrorController.php
index a907ef0abe5b..a8b25adcf016 100644
--- a/src/Symfony/Bundle/TwigBundle/Controller/PreviewErrorController.php
+++ b/src/Symfony/Bundle/TwigBundle/Controller/PreviewErrorController.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\TwigBundle\Controller;
 
 use Symfony\Component\Debug\Exception\FlattenException;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * PreviewErrorController can be used to test error pages.
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExceptionListenerPass.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExceptionListenerPass.php
index b7ebb2a40651..6b6149ad57c5 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExceptionListenerPass.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExceptionListenerPass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\TwigBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * Registers the Twig exception listener if Twig is registered as a templating engine.
@@ -32,7 +32,7 @@ public function process(ContainerBuilder $container)
             $container->removeDefinition('twig.exception_listener');
         } elseif ($container->hasParameter('templating.engines')) {
             $engines = $container->getParameter('templating.engines');
-            if (!in_array('twig', $engines)) {
+            if (!\in_array('twig', $engines)) {
                 $container->removeDefinition('twig.exception_listener');
             }
         }
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExtensionPass.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExtensionPass.php
index 0ca55f298ee8..5a107a07c598 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExtensionPass.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExtensionPass.php
@@ -44,7 +44,7 @@ public function process(ContainerBuilder $container)
             $container->getDefinition('twig.extension.form')->addTag('twig.extension');
             $reflClass = new \ReflectionClass('Symfony\Bridge\Twig\Extension\FormExtension');
 
-            $coreThemePath = dirname(dirname($reflClass->getFileName())).'/Resources/views/Form';
+            $coreThemePath = \dirname(\dirname($reflClass->getFileName())).'/Resources/views/Form';
             $container->getDefinition('twig.loader.native_filesystem')->addMethodCall('addPath', array($coreThemePath));
 
             $paths = $container->getDefinition('twig.cache_warmer')->getArgument(2);
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/RuntimeLoaderPass.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/RuntimeLoaderPass.php
index a4defc51ff33..bd6393bc9cea 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/RuntimeLoaderPass.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/RuntimeLoaderPass.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\TwigBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 
 /**
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/TwigEnvironmentPass.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/TwigEnvironmentPass.php
index d5e6cb6c4acb..fc2c7b86722d 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/TwigEnvironmentPass.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/TwigEnvironmentPass.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\TwigBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Adds tagged twig.extension services to twig service.
@@ -41,7 +41,7 @@ public function process(ContainerBuilder $container)
             $methodCall = array('addExtension', array(new Reference($id)));
             $extensionClass = $container->getDefinition($id)->getClass();
 
-            if (is_string($extensionClass) && 0 === strpos($extensionClass, 'Symfony\Bridge\Twig\Extension')) {
+            if (\is_string($extensionClass) && 0 === strpos($extensionClass, 'Symfony\Bridge\Twig\Extension')) {
                 $twigBridgeExtensionsMethodCalls[] = $methodCall;
             } else {
                 $othersExtensionsMethodCalls[] = $methodCall;
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/TwigLoaderPass.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/TwigLoaderPass.php
index a35e8b762bb0..3fc2696904be 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/TwigLoaderPass.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/TwigLoaderPass.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Bundle\TwigBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Adds services tagged twig.loader as Twig loaders.
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
index f4488c0d5ccd..bfe4047b8368 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
@@ -56,7 +56,7 @@ private function addFormThemesSection(ArrayNodeDefinition $rootNode)
                     ->prototype('scalar')->defaultValue('form_div_layout.html.twig')->end()
                     ->example(array('MyBundle::form.html.twig'))
                     ->validate()
-                        ->ifTrue(function ($v) { return !in_array('form_div_layout.html.twig', $v); })
+                        ->ifTrue(function ($v) { return !\in_array('form_div_layout.html.twig', $v); })
                         ->then(function ($v) {
                             return array_merge(array('form_div_layout.html.twig'), $v);
                         })
@@ -77,7 +77,7 @@ private function addGlobalsSection(ArrayNodeDefinition $rootNode)
                     ->example(array('foo' => '"@bar"', 'pi' => 3.14))
                     ->prototype('array')
                         ->beforeNormalization()
-                            ->ifTrue(function ($v) { return is_string($v) && 0 === strpos($v, '@'); })
+                            ->ifTrue(function ($v) { return \is_string($v) && 0 === strpos($v, '@'); })
                             ->then(function ($v) {
                                 if (0 === strpos($v, '@@')) {
                                     return substr($v, 1);
@@ -88,7 +88,7 @@ private function addGlobalsSection(ArrayNodeDefinition $rootNode)
                         ->end()
                         ->beforeNormalization()
                             ->ifTrue(function ($v) {
-                                if (is_array($v)) {
+                                if (\is_array($v)) {
                                     $keys = array_keys($v);
                                     sort($keys);
 
@@ -142,7 +142,7 @@ private function addTwigOptions(ArrayNodeDefinition $rootNode)
                         ->then(function ($paths) {
                             $normalized = array();
                             foreach ($paths as $path => $namespace) {
-                                if (is_array($namespace)) {
+                                if (\is_array($namespace)) {
                                     // xml
                                     $path = $namespace['value'];
                                     $namespace = $namespace['namespace'];
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/TwigExtension.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/TwigExtension.php
index ee325ba75ac5..d3a24dfa479a 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/TwigExtension.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/TwigExtension.php
@@ -15,8 +15,8 @@
 use Symfony\Component\Config\Resource\FileExistenceResource;
 use Symfony\Component\Console\Application;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Twig\Extension\ExtensionInterface;
 use Twig\Extension\RuntimeExtensionInterface;
@@ -54,7 +54,7 @@ public function load(array $configs, ContainerBuilder $container)
         foreach ($configs as $key => $config) {
             if (isset($config['globals'])) {
                 foreach ($config['globals'] as $name => $value) {
-                    if (is_array($value) && isset($value['key'])) {
+                    if (\is_array($value) && isset($value['key'])) {
                         $configs[$key]['globals'][$name] = array(
                             'key' => $name,
                             'value' => $value,
diff --git a/src/Symfony/Bundle/TwigBundle/TemplateIterator.php b/src/Symfony/Bundle/TwigBundle/TemplateIterator.php
index 1b700a2d36b2..189a2e9563c3 100644
--- a/src/Symfony/Bundle/TwigBundle/TemplateIterator.php
+++ b/src/Symfony/Bundle/TwigBundle/TemplateIterator.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\TwigBundle;
 
-use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\Finder\Finder;
+use Symfony\Component\HttpKernel\KernelInterface;
 
 /**
  * Iterator for all templates in bundles and in the application Resources directory.
diff --git a/src/Symfony/Bundle/TwigBundle/Tests/Controller/ExceptionControllerTest.php b/src/Symfony/Bundle/TwigBundle/Tests/Controller/ExceptionControllerTest.php
index 5d779c68c2a5..c58cf686f0b0 100644
--- a/src/Symfony/Bundle/TwigBundle/Tests/Controller/ExceptionControllerTest.php
+++ b/src/Symfony/Bundle/TwigBundle/Tests/Controller/ExceptionControllerTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\TwigBundle\Tests\Controller;
 
-use Symfony\Bundle\TwigBundle\Tests\TestCase;
 use Symfony\Bundle\TwigBundle\Controller\ExceptionController;
+use Symfony\Bundle\TwigBundle\Tests\TestCase;
 use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\HttpFoundation\Request;
 use Twig\Environment;
diff --git a/src/Symfony/Bundle/TwigBundle/Tests/Controller/PreviewErrorControllerTest.php b/src/Symfony/Bundle/TwigBundle/Tests/Controller/PreviewErrorControllerTest.php
index 417c83cdecc4..1ca5015a49fc 100644
--- a/src/Symfony/Bundle/TwigBundle/Tests/Controller/PreviewErrorControllerTest.php
+++ b/src/Symfony/Bundle/TwigBundle/Tests/Controller/PreviewErrorControllerTest.php
@@ -14,8 +14,8 @@
 use Symfony\Bundle\TwigBundle\Controller\PreviewErrorController;
 use Symfony\Bundle\TwigBundle\Tests\TestCase;
 use Symfony\Component\Debug\Exception\FlattenException;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 class PreviewErrorControllerTest extends TestCase
diff --git a/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php b/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php
index b7870ac56c06..621967a596df 100644
--- a/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php
+++ b/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Compiler/TwigLoaderPassTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Bundle\TwigBundle\Tests\DependencyInjection\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigLoaderPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigLoaderPass;
 
 class TwigLoaderPassTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/TwigExtensionTest.php b/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/TwigExtensionTest.php
index fa4264f2e2cd..0980197b2342 100644
--- a/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/TwigExtensionTest.php
+++ b/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/TwigExtensionTest.php
@@ -17,11 +17,11 @@
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Compiler\PassConfig;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
+use Symfony\Component\DependencyInjection\Reference;
 
 class TwigExtensionTest extends TestCase
 {
@@ -72,7 +72,7 @@ public function testLoadFullConfiguration($format)
         $this->assertEquals(3.14, $calls[4][1][1], '->load() registers variables as Twig globals');
 
         // Yaml and Php specific configs
-        if (in_array($format, array('yml', 'php'))) {
+        if (\in_array($format, array('yml', 'php'))) {
             $this->assertEquals('bad', $calls[5][1][0], '->load() registers variables as Twig globals');
             $this->assertEquals(array('key' => 'foo'), $calls[5][1][1], '->load() registers variables as Twig globals');
         }
@@ -155,7 +155,7 @@ public function testGlobalsWithDifferentTypesAndValues()
         $this->compileContainer($container);
 
         $calls = $container->getDefinition('twig')->getMethodCalls();
-        foreach (array_slice($calls, 2) as $call) {
+        foreach (\array_slice($calls, 2) as $call) {
             $this->assertEquals(key($globals), $call[1][0]);
             $this->assertSame(current($globals), $call[1][1]);
 
diff --git a/src/Symfony/Bundle/TwigBundle/Tests/Functional/CacheWarmingTest.php b/src/Symfony/Bundle/TwigBundle/Tests/Functional/CacheWarmingTest.php
index a21c11adca16..067502edf12c 100644
--- a/src/Symfony/Bundle/TwigBundle/Tests/Functional/CacheWarmingTest.php
+++ b/src/Symfony/Bundle/TwigBundle/Tests/Functional/CacheWarmingTest.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Bundle\TwigBundle\Tests\Functional;
 
-use Symfony\Component\HttpKernel\Kernel;
-use Symfony\Component\Config\Loader\LoaderInterface;
-use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
 use Symfony\Bundle\TwigBundle\Tests\TestCase;
 use Symfony\Bundle\TwigBundle\TwigBundle;
+use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\HttpKernel\Kernel;
 
 class CacheWarmingTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/TwigBundle/Tests/Functional/NoTemplatingEntryTest.php b/src/Symfony/Bundle/TwigBundle/Tests/Functional/NoTemplatingEntryTest.php
index 952b5e6ae193..97e27fa40fc0 100644
--- a/src/Symfony/Bundle/TwigBundle/Tests/Functional/NoTemplatingEntryTest.php
+++ b/src/Symfony/Bundle/TwigBundle/Tests/Functional/NoTemplatingEntryTest.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Bundle\TwigBundle\Tests\Functional;
 
-use Symfony\Component\HttpKernel\Kernel;
-use Symfony\Component\Config\Loader\LoaderInterface;
-use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
 use Symfony\Bundle\TwigBundle\Tests\TestCase;
 use Symfony\Bundle\TwigBundle\TwigBundle;
+use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\HttpKernel\Kernel;
 
 class NoTemplatingEntryTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/TwigBundle/TwigBundle.php b/src/Symfony/Bundle/TwigBundle/TwigBundle.php
index 21a39a12373a..bd766c15219e 100644
--- a/src/Symfony/Bundle/TwigBundle/TwigBundle.php
+++ b/src/Symfony/Bundle/TwigBundle/TwigBundle.php
@@ -11,15 +11,15 @@
 
 namespace Symfony\Bundle\TwigBundle;
 
-use Symfony\Component\Console\Application;
-use Symfony\Component\HttpKernel\Bundle\Bundle;
-use Symfony\Component\DependencyInjection\Compiler\PassConfig;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigEnvironmentPass;
-use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigLoaderPass;
 use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\ExceptionListenerPass;
 use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\ExtensionPass;
 use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\RuntimeLoaderPass;
+use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigEnvironmentPass;
+use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\TwigLoaderPass;
+use Symfony\Component\Console\Application;
+use Symfony\Component\DependencyInjection\Compiler\PassConfig;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\Bundle\Bundle;
 
 /**
  * Bundle.
diff --git a/src/Symfony/Bundle/TwigBundle/TwigEngine.php b/src/Symfony/Bundle/TwigBundle/TwigEngine.php
index cc13c280b10f..1ac56a6f59ca 100644
--- a/src/Symfony/Bundle/TwigBundle/TwigEngine.php
+++ b/src/Symfony/Bundle/TwigBundle/TwigEngine.php
@@ -14,9 +14,9 @@
 use Symfony\Bridge\Twig\TwigEngine as BaseEngine;
 use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface;
 use Symfony\Bundle\FrameworkBundle\Templating\TemplateReference;
-use Symfony\Component\Templating\TemplateNameParserInterface;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Config\FileLocatorInterface;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Templating\TemplateNameParserInterface;
 use Twig\Environment;
 use Twig\Error\Error;
 
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php b/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
index dff6bb4b9861..47caadd01ff4 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Bundle\WebProfilerBundle\Controller;
 
-use Symfony\Component\HttpKernel\Debug\FileLinkFormatter;
-use Symfony\Component\HttpKernel\Profiler\Profiler;
 use Symfony\Component\Debug\ExceptionHandler;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Debug\FileLinkFormatter;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\HttpKernel\Profiler\Profiler;
 use Twig\Environment;
 use Twig\Error\LoaderError;
 use Twig\Loader\ExistsLoaderInterface;
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Controller/ProfilerController.php b/src/Symfony/Bundle/WebProfilerBundle/Controller/ProfilerController.php
index ee9e72f7a135..1e202594fe21 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Controller/ProfilerController.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Controller/ProfilerController.php
@@ -366,7 +366,7 @@ public function openAction(Request $request)
         $file = $request->query->get('file');
         $line = $request->query->get('line');
 
-        $filename = $this->baseDir.DIRECTORY_SEPARATOR.$file;
+        $filename = $this->baseDir.\DIRECTORY_SEPARATOR.$file;
 
         if (preg_match("'(^|[/\\\\])\.'", $file) || !is_readable($filename)) {
             throw new NotFoundHttpException(sprintf('The file "%s" cannot be opened.', $file));
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Controller/RouterController.php b/src/Symfony/Bundle/WebProfilerBundle/Controller/RouterController.php
index 685f08d18f38..14e33a110738 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Controller/RouterController.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Controller/RouterController.php
@@ -13,13 +13,13 @@
 
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
+use Symfony\Component\HttpKernel\DataCollector\RequestDataCollector;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\HttpKernel\Profiler\Profiler;
 use Symfony\Component\Routing\Matcher\TraceableUrlMatcher;
+use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
 use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Routing\RouterInterface;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\HttpKernel\Profiler\Profiler;
-use Symfony\Component\HttpKernel\DataCollector\RequestDataCollector;
 use Twig\Environment;
 
 /**
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Csp/ContentSecurityPolicyHandler.php b/src/Symfony/Bundle/WebProfilerBundle/Csp/ContentSecurityPolicyHandler.php
index 639ee5ca6bdf..df4458474b05 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Csp/ContentSecurityPolicyHandler.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Csp/ContentSecurityPolicyHandler.php
@@ -141,7 +141,7 @@ private function updateCspHeaders(Response $response, array $nonces = array())
                     }
                 }
                 $ruleIsSet = true;
-                if (!in_array('\'unsafe-inline\'', $headers[$header][$type], true)) {
+                if (!\in_array('\'unsafe-inline\'', $headers[$header][$type], true)) {
                     $headers[$header][$type][] = '\'unsafe-inline\'';
                 }
                 $headers[$header][$type][] = sprintf('\'nonce-%s\'', $nonces[$tokenName]);
@@ -196,7 +196,7 @@ private function parseDirectives($header)
 
         foreach (explode(';', $header) as $directive) {
             $parts = explode(' ', trim($directive));
-            if (count($parts) < 1) {
+            if (\count($parts) < 1) {
                 continue;
             }
             $name = array_shift($parts);
@@ -224,7 +224,7 @@ private function authorizesInline(array $directivesSet, $type)
             return false;
         }
 
-        return in_array('\'unsafe-inline\'', $directives, true) && !$this->hasHashOrNonce($directives);
+        return \in_array('\'unsafe-inline\'', $directives, true) && !$this->hasHashOrNonce($directives);
     }
 
     private function hasHashOrNonce(array $directives)
@@ -236,7 +236,7 @@ private function hasHashOrNonce(array $directives)
             if ('\'nonce-' === substr($directive, 0, 7)) {
                 return true;
             }
-            if (in_array(substr($directive, 0, 8), array('\'sha256-', '\'sha384-', '\'sha512-'), true)) {
+            if (\in_array(substr($directive, 0, 8), array('\'sha256-', '\'sha384-', '\'sha512-'), true)) {
                 return true;
             }
         }
diff --git a/src/Symfony/Bundle/WebProfilerBundle/DependencyInjection/WebProfilerExtension.php b/src/Symfony/Bundle/WebProfilerBundle/DependencyInjection/WebProfilerExtension.php
index c4c9e0a37bf8..594e7fa3a7b4 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/DependencyInjection/WebProfilerExtension.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/DependencyInjection/WebProfilerExtension.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Bundle\WebProfilerBundle\DependencyInjection;
 
+use Symfony\Bundle\WebProfilerBundle\EventListener\WebDebugToolbarListener;
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\Config\FileLocator;
 use Symfony\Component\HttpKernel\Kernel;
-use Symfony\Bundle\WebProfilerBundle\EventListener\WebDebugToolbarListener;
 
 /**
  * WebProfilerExtension.
diff --git a/src/Symfony/Bundle/WebProfilerBundle/EventListener/WebDebugToolbarListener.php b/src/Symfony/Bundle/WebProfilerBundle/EventListener/WebDebugToolbarListener.php
index 490e16382fe0..64bcb3fdf60f 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/EventListener/WebDebugToolbarListener.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/EventListener/WebDebugToolbarListener.php
@@ -12,12 +12,12 @@
 namespace Symfony\Bundle\WebProfilerBundle\EventListener;
 
 use Symfony\Bundle\WebProfilerBundle\Csp\ContentSecurityPolicyHandler;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Session\Flash\AutoExpireFlashBag;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Twig\Environment;
 
@@ -70,7 +70,7 @@ public function onKernelResponse(FilterResponseEvent $event)
                     $this->urlGenerator->generate('_profiler', array('token' => $response->headers->get('X-Debug-Token')), UrlGeneratorInterface::ABSOLUTE_URL)
                 );
             } catch (\Exception $e) {
-                $response->headers->set('X-Debug-Error', get_class($e).': '.preg_replace('/\s+/', ' ', $e->getMessage()));
+                $response->headers->set('X-Debug-Error', \get_class($e).': '.preg_replace('/\s+/', ' ', $e->getMessage()));
             }
         }
 
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Profiler/TemplateManager.php b/src/Symfony/Bundle/WebProfilerBundle/Profiler/TemplateManager.php
index 3bc642f428ff..0c6ca6591d37 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Profiler/TemplateManager.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Profiler/TemplateManager.php
@@ -12,8 +12,8 @@
 namespace Symfony\Bundle\WebProfilerBundle\Profiler;
 
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\HttpKernel\Profiler\Profiler;
 use Symfony\Component\HttpKernel\Profiler\Profile;
+use Symfony\Component\HttpKernel\Profiler\Profiler;
 use Twig\Environment;
 use Twig\Error\LoaderError;
 use Twig\Loader\ExistsLoaderInterface;
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Tests/Controller/ProfilerControllerTest.php b/src/Symfony/Bundle/WebProfilerBundle/Tests/Controller/ProfilerControllerTest.php
index 6b02ec292c05..f2dd79123075 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Tests/Controller/ProfilerControllerTest.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Tests/Controller/ProfilerControllerTest.php
@@ -14,9 +14,9 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\WebProfilerBundle\Controller\ProfilerController;
 use Symfony\Bundle\WebProfilerBundle\Csp\ContentSecurityPolicyHandler;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpKernel\Profiler\Profile;
-use Symfony\Component\HttpFoundation\Request;
 
 class ProfilerControllerTest extends TestCase
 {
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Tests/DependencyInjection/WebProfilerExtensionTest.php b/src/Symfony/Bundle/WebProfilerBundle/Tests/DependencyInjection/WebProfilerExtensionTest.php
index 43f33dc11ffa..0fb7f85eb5f5 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Tests/DependencyInjection/WebProfilerExtensionTest.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Tests/DependencyInjection/WebProfilerExtensionTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\WebProfilerBundle\Tests\DependencyInjection;
 
-use Symfony\Bundle\WebProfilerBundle\Tests\TestCase;
 use Symfony\Bundle\WebProfilerBundle\DependencyInjection\WebProfilerExtension;
+use Symfony\Bundle\WebProfilerBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
@@ -33,7 +33,7 @@ public static function assertSaneContainer(Container $container, $message = '',
         $errors = array();
         $knownPrivates[] = 'debug.file_link_formatter.url_format';
         foreach ($container->getServiceIds() as $id) {
-            if (in_array($id, $knownPrivates, true)) { // for BC with 3.4
+            if (\in_array($id, $knownPrivates, true)) { // for BC with 3.4
                 continue;
             }
             try {
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Tests/Profiler/TemplateManagerTest.php b/src/Symfony/Bundle/WebProfilerBundle/Tests/Profiler/TemplateManagerTest.php
index ee0ba44fa74d..6043be51aaa0 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Tests/Profiler/TemplateManagerTest.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Tests/Profiler/TemplateManagerTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Bundle\WebProfilerBundle\Tests\Profiler;
 
-use Symfony\Bundle\WebProfilerBundle\Tests\TestCase;
 use Symfony\Bundle\WebProfilerBundle\Profiler\TemplateManager;
+use Symfony\Bundle\WebProfilerBundle\Tests\TestCase;
 use Twig\Environment;
 
 /**
diff --git a/src/Symfony/Bundle/WebServerBundle/Command/ServerRunCommand.php b/src/Symfony/Bundle/WebServerBundle/Command/ServerRunCommand.php
index 07f66294e2c1..1c671bf6683f 100644
--- a/src/Symfony/Bundle/WebServerBundle/Command/ServerRunCommand.php
+++ b/src/Symfony/Bundle/WebServerBundle/Command/ServerRunCommand.php
@@ -15,10 +15,10 @@
 use Symfony\Bundle\WebServerBundle\WebServerConfig;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputInterface;
-use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\Process\Process;
 
diff --git a/src/Symfony/Bundle/WebServerBundle/Command/ServerStartCommand.php b/src/Symfony/Bundle/WebServerBundle/Command/ServerStartCommand.php
index 664bce114b64..daeada8ec073 100644
--- a/src/Symfony/Bundle/WebServerBundle/Command/ServerStartCommand.php
+++ b/src/Symfony/Bundle/WebServerBundle/Command/ServerStartCommand.php
@@ -17,8 +17,8 @@
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
@@ -90,7 +90,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
     {
         $io = new SymfonyStyle($input, $output instanceof ConsoleOutputInterface ? $output->getErrorOutput() : $output);
 
-        if (!extension_loaded('pcntl')) {
+        if (!\extension_loaded('pcntl')) {
             $io->error(array(
                 'This command needs the pcntl extension to run.',
                 'You can either install it or use the "server:run" command instead.',
diff --git a/src/Symfony/Bundle/WebServerBundle/Command/ServerStatusCommand.php b/src/Symfony/Bundle/WebServerBundle/Command/ServerStatusCommand.php
index 798095061d1d..5ee29905fdb3 100644
--- a/src/Symfony/Bundle/WebServerBundle/Command/ServerStatusCommand.php
+++ b/src/Symfony/Bundle/WebServerBundle/Command/ServerStatusCommand.php
@@ -16,8 +16,8 @@
 use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 
 /**
diff --git a/src/Symfony/Bundle/WebServerBundle/Command/ServerStopCommand.php b/src/Symfony/Bundle/WebServerBundle/Command/ServerStopCommand.php
index e63dce89d06d..a64bbcbb0522 100644
--- a/src/Symfony/Bundle/WebServerBundle/Command/ServerStopCommand.php
+++ b/src/Symfony/Bundle/WebServerBundle/Command/ServerStopCommand.php
@@ -14,9 +14,9 @@
 use Symfony\Bundle\WebServerBundle\WebServer;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputInterface;
-use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Output\ConsoleOutputInterface;
 use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 
 /**
diff --git a/src/Symfony/Bundle/WebServerBundle/DependencyInjection/WebServerExtension.php b/src/Symfony/Bundle/WebServerBundle/DependencyInjection/WebServerExtension.php
index 4285be0a9db0..3dc492dcd102 100644
--- a/src/Symfony/Bundle/WebServerBundle/DependencyInjection/WebServerExtension.php
+++ b/src/Symfony/Bundle/WebServerBundle/DependencyInjection/WebServerExtension.php
@@ -12,10 +12,10 @@
 namespace Symfony\Bundle\WebServerBundle\DependencyInjection;
 
 use Symfony\Bridge\Monolog\Formatter\ConsoleFormatter;
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\Config\FileLocator;
 
 /**
  * @author Robin Chalas <robin.chalas@gmail.com>
diff --git a/src/Symfony/Bundle/WebServerBundle/WebServer.php b/src/Symfony/Bundle/WebServerBundle/WebServer.php
index beb5190b727a..f727b3ed4e71 100644
--- a/src/Symfony/Bundle/WebServerBundle/WebServer.php
+++ b/src/Symfony/Bundle/WebServerBundle/WebServer.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Bundle\WebServerBundle;
 
+use Symfony\Component\Process\Exception\RuntimeException;
 use Symfony\Component\Process\PhpExecutableFinder;
 use Symfony\Component\Process\Process;
-use Symfony\Component\Process\Exception\RuntimeException;
 
 /**
  * Manages a local HTTP web server.
@@ -154,7 +154,7 @@ private function createServerProcess(WebServerConfig $config)
         $process->setWorkingDirectory($config->getDocumentRoot());
         $process->setTimeout(null);
 
-        if (in_array('APP_ENV', explode(',', getenv('SYMFONY_DOTENV_VARS')))) {
+        if (\in_array('APP_ENV', explode(',', getenv('SYMFONY_DOTENV_VARS')))) {
             $process->setEnv(array('APP_ENV' => false));
             $process->inheritEnvironmentVariables();
         }
diff --git a/src/Symfony/Component/Asset/Tests/PackageTest.php b/src/Symfony/Component/Asset/Tests/PackageTest.php
index 9a1719660462..a5da219b59b5 100644
--- a/src/Symfony/Component/Asset/Tests/PackageTest.php
+++ b/src/Symfony/Component/Asset/Tests/PackageTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Asset\Package;
-use Symfony\Component\Asset\VersionStrategy\StaticVersionStrategy;
 use Symfony\Component\Asset\VersionStrategy\EmptyVersionStrategy;
+use Symfony\Component\Asset\VersionStrategy\StaticVersionStrategy;
 
 class PackageTest extends TestCase
 {
diff --git a/src/Symfony/Component/Asset/Tests/UrlPackageTest.php b/src/Symfony/Component/Asset/Tests/UrlPackageTest.php
index 97e7a46d706d..d37ba0126c5a 100644
--- a/src/Symfony/Component/Asset/Tests/UrlPackageTest.php
+++ b/src/Symfony/Component/Asset/Tests/UrlPackageTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Asset\UrlPackage;
-use Symfony\Component\Asset\VersionStrategy\StaticVersionStrategy;
 use Symfony\Component\Asset\VersionStrategy\EmptyVersionStrategy;
+use Symfony\Component\Asset\VersionStrategy\StaticVersionStrategy;
 
 class UrlPackageTest extends TestCase
 {
diff --git a/src/Symfony/Component/Asset/UrlPackage.php b/src/Symfony/Component/Asset/UrlPackage.php
index 782b2ddfce93..77055e43db37 100644
--- a/src/Symfony/Component/Asset/UrlPackage.php
+++ b/src/Symfony/Component/Asset/UrlPackage.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Asset;
 
 use Symfony\Component\Asset\Context\ContextInterface;
-use Symfony\Component\Asset\VersionStrategy\VersionStrategyInterface;
 use Symfony\Component\Asset\Exception\InvalidArgumentException;
 use Symfony\Component\Asset\Exception\LogicException;
+use Symfony\Component\Asset\VersionStrategy\VersionStrategyInterface;
 
 /**
  * Package that adds a base URL to asset URLs in addition to a version.
@@ -47,7 +47,7 @@ public function __construct($baseUrls, VersionStrategyInterface $versionStrategy
     {
         parent::__construct($versionStrategy, $context);
 
-        if (!is_array($baseUrls)) {
+        if (!\is_array($baseUrls)) {
             $baseUrls = (array) $baseUrls;
         }
 
@@ -101,7 +101,7 @@ public function getUrl($path)
      */
     public function getBaseUrl($path)
     {
-        if (1 === count($this->baseUrls)) {
+        if (1 === \count($this->baseUrls)) {
             return $this->baseUrls[0];
         }
 
@@ -120,7 +120,7 @@ public function getBaseUrl($path)
      */
     protected function chooseBaseUrl($path)
     {
-        return (int) fmod(hexdec(substr(hash('sha256', $path), 0, 10)), count($this->baseUrls));
+        return (int) fmod(hexdec(substr(hash('sha256', $path), 0, 10)), \count($this->baseUrls));
     }
 
     private function getSslUrls($urls)
diff --git a/src/Symfony/Component/BrowserKit/Client.php b/src/Symfony/Component/BrowserKit/Client.php
index 2fa4fba947d1..6908c26000cf 100644
--- a/src/Symfony/Component/BrowserKit/Client.php
+++ b/src/Symfony/Component/BrowserKit/Client.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\BrowserKit;
 
 use Symfony\Component\DomCrawler\Crawler;
-use Symfony\Component\DomCrawler\Link;
 use Symfony\Component\DomCrawler\Form;
+use Symfony\Component\DomCrawler\Link;
 use Symfony\Component\Process\PhpProcess;
 
 /**
@@ -355,7 +355,7 @@ protected function doRequestInProcess($request)
             unlink($deprecationsFile);
             foreach ($deprecations ? unserialize($deprecations) : array() as $deprecation) {
                 if ($deprecation[0]) {
-                    trigger_error($deprecation[1], E_USER_DEPRECATED);
+                    @trigger_error($deprecation[1], E_USER_DEPRECATED);
                 } else {
                     @trigger_error($deprecation[1], E_USER_DEPRECATED);
                 }
@@ -497,7 +497,7 @@ public function followRedirect()
 
         $request = $this->internalRequest;
 
-        if (in_array($this->internalResponse->getStatus(), array(301, 302, 303))) {
+        if (\in_array($this->internalResponse->getStatus(), array(301, 302, 303))) {
             $method = 'GET';
             $files = array();
             $content = null;
diff --git a/src/Symfony/Component/BrowserKit/Cookie.php b/src/Symfony/Component/BrowserKit/Cookie.php
index 480f02b9482d..0fd530af8bfe 100644
--- a/src/Symfony/Component/BrowserKit/Cookie.php
+++ b/src/Symfony/Component/BrowserKit/Cookie.php
@@ -169,7 +169,7 @@ public static function fromString($cookie, $url = null)
                 continue;
             }
 
-            if (2 === count($elements = explode('=', $part, 2))) {
+            if (2 === \count($elements = explode('=', $part, 2))) {
                 if ('expires' === strtolower($elements[0])) {
                     $elements[1] = self::parseDate($elements[1]);
                 }
@@ -193,7 +193,7 @@ public static function fromString($cookie, $url = null)
     private static function parseDate($dateValue)
     {
         // trim single quotes around date if present
-        if (($length = strlen($dateValue)) > 1 && "'" === $dateValue[0] && "'" === $dateValue[$length - 1]) {
+        if (($length = \strlen($dateValue)) > 1 && "'" === $dateValue[0] && "'" === $dateValue[$length - 1]) {
             $dateValue = substr($dateValue, 1, -1);
         }
 
diff --git a/src/Symfony/Component/BrowserKit/CookieJar.php b/src/Symfony/Component/BrowserKit/CookieJar.php
index 7a4d64c10e5e..24eb9abeddbf 100644
--- a/src/Symfony/Component/BrowserKit/CookieJar.php
+++ b/src/Symfony/Component/BrowserKit/CookieJar.php
@@ -123,7 +123,7 @@ public function updateFromSetCookie(array $setCookies, $uri = null)
                 if (0 === $i || preg_match('/^(?P<token>\s*[0-9A-Za-z!#\$%\&\'\*\+\-\.^_`\|~]+)=/', $part)) {
                     $cookies[] = ltrim($part);
                 } else {
-                    $cookies[count($cookies) - 1] .= ','.$part;
+                    $cookies[\count($cookies) - 1] .= ','.$part;
                 }
             }
         }
@@ -186,13 +186,13 @@ public function allValues($uri, $returnsRawValue = false)
         foreach ($this->cookieJar as $domain => $pathCookies) {
             if ($domain) {
                 $domain = '.'.ltrim($domain, '.');
-                if ($domain != substr('.'.$parts['host'], -strlen($domain))) {
+                if ($domain != substr('.'.$parts['host'], -\strlen($domain))) {
                     continue;
                 }
             }
 
             foreach ($pathCookies as $path => $namedCookies) {
-                if ($path != substr($parts['path'], 0, strlen($path))) {
+                if ($path != substr($parts['path'], 0, \strlen($path))) {
                     continue;
                 }
 
diff --git a/src/Symfony/Component/BrowserKit/History.php b/src/Symfony/Component/BrowserKit/History.php
index aeca3277341c..beec17c6b4d9 100644
--- a/src/Symfony/Component/BrowserKit/History.php
+++ b/src/Symfony/Component/BrowserKit/History.php
@@ -35,9 +35,9 @@ public function clear()
      */
     public function add(Request $request)
     {
-        $this->stack = array_slice($this->stack, 0, $this->position + 1);
+        $this->stack = \array_slice($this->stack, 0, $this->position + 1);
         $this->stack[] = clone $request;
-        $this->position = count($this->stack) - 1;
+        $this->position = \count($this->stack) - 1;
     }
 
     /**
@@ -47,7 +47,7 @@ public function add(Request $request)
      */
     public function isEmpty()
     {
-        return 0 == count($this->stack);
+        return 0 == \count($this->stack);
     }
 
     /**
@@ -75,7 +75,7 @@ public function back()
      */
     public function forward()
     {
-        if ($this->position > count($this->stack) - 2) {
+        if ($this->position > \count($this->stack) - 2) {
             throw new \LogicException('You are already on the last page.');
         }
 
diff --git a/src/Symfony/Component/BrowserKit/Response.php b/src/Symfony/Component/BrowserKit/Response.php
index 16b2f5bcfe25..6c50aeee4336 100644
--- a/src/Symfony/Component/BrowserKit/Response.php
+++ b/src/Symfony/Component/BrowserKit/Response.php
@@ -44,7 +44,7 @@ public function __toString()
     {
         $headers = '';
         foreach ($this->headers as $name => $value) {
-            if (is_string($value)) {
+            if (\is_string($value)) {
                 $headers .= $this->buildHeader($name, $value);
             } else {
                 foreach ($value as $headerValue) {
@@ -113,10 +113,10 @@ public function getHeader($header, $first = true)
         foreach ($this->headers as $key => $value) {
             if (str_replace('-', '_', strtolower($key)) === $normalizedHeader) {
                 if ($first) {
-                    return is_array($value) ? (count($value) ? $value[0] : '') : $value;
+                    return \is_array($value) ? (\count($value) ? $value[0] : '') : $value;
                 }
 
-                return is_array($value) ? $value : array($value);
+                return \is_array($value) ? $value : array($value);
             }
         }
 
diff --git a/src/Symfony/Component/BrowserKit/Tests/ClientTest.php b/src/Symfony/Component/BrowserKit/Tests/ClientTest.php
index 9c7267e83b72..bbaceb0c3296 100644
--- a/src/Symfony/Component/BrowserKit/Tests/ClientTest.php
+++ b/src/Symfony/Component/BrowserKit/Tests/ClientTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\BrowserKit\Client;
-use Symfony\Component\BrowserKit\History;
 use Symfony\Component\BrowserKit\CookieJar;
+use Symfony\Component\BrowserKit\History;
 use Symfony\Component\BrowserKit\Response;
 
 class SpecialResponse extends Response
diff --git a/src/Symfony/Component/Cache/Adapter/AbstractAdapter.php b/src/Symfony/Component/Cache/Adapter/AbstractAdapter.php
index 3afc98208901..426d6e8a5743 100644
--- a/src/Symfony/Component/Cache/Adapter/AbstractAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/AbstractAdapter.php
@@ -36,8 +36,8 @@ abstract class AbstractAdapter implements AdapterInterface, LoggerAwareInterface
     protected function __construct(string $namespace = '', int $defaultLifetime = 0)
     {
         $this->namespace = '' === $namespace ? '' : CacheItem::validateKey($namespace).':';
-        if (null !== $this->maxIdLength && strlen($namespace) > $this->maxIdLength - 24) {
-            throw new InvalidArgumentException(sprintf('Namespace must be %d chars max, %d given ("%s")', $this->maxIdLength - 24, strlen($namespace), $namespace));
+        if (null !== $this->maxIdLength && \strlen($namespace) > $this->maxIdLength - 24) {
+            throw new InvalidArgumentException(sprintf('Namespace must be %d chars max, %d given ("%s")', $this->maxIdLength - 24, \strlen($namespace), $namespace));
         }
         $this->createCacheItem = \Closure::bind(
             function ($key, $value, $isHit) use ($defaultLifetime) {
@@ -124,8 +124,8 @@ public static function createSystemCache($namespace, $defaultLifetime, $version,
 
     public static function createConnection($dsn, array $options = array())
     {
-        if (!is_string($dsn)) {
-            throw new InvalidArgumentException(sprintf('The %s() method expect argument #1 to be string, %s given.', __METHOD__, gettype($dsn)));
+        if (!\is_string($dsn)) {
+            throw new InvalidArgumentException(sprintf('The %s() method expect argument #1 to be string, %s given.', __METHOD__, \gettype($dsn)));
         }
         if (0 === strpos($dsn, 'redis://')) {
             return RedisAdapter::createConnection($dsn, $options);
@@ -234,11 +234,11 @@ public function commit()
                 continue;
             }
             if (\is_array($e) || 1 === \count($values)) {
-                foreach (is_array($e) ? $e : array_keys($values) as $id) {
+                foreach (\is_array($e) ? $e : array_keys($values) as $id) {
                     $ok = false;
                     $v = $values[$id];
-                    $type = is_object($v) ? get_class($v) : gettype($v);
-                    CacheItem::log($this->logger, 'Failed to save key "{key}" ({type})', array('key' => substr($id, strlen($this->namespace)), 'type' => $type, 'exception' => $e instanceof \Exception ? $e : null));
+                    $type = \is_object($v) ? \get_class($v) : \gettype($v);
+                    CacheItem::log($this->logger, 'Failed to save key "{key}" ({type})', array('key' => substr($id, \strlen($this->namespace)), 'type' => $type, 'exception' => $e instanceof \Exception ? $e : null));
                 }
             } else {
                 foreach ($values as $id => $v) {
@@ -259,8 +259,8 @@ public function commit()
                     continue;
                 }
                 $ok = false;
-                $type = is_object($v) ? get_class($v) : gettype($v);
-                CacheItem::log($this->logger, 'Failed to save key "{key}" ({type})', array('key' => substr($id, strlen($this->namespace)), 'type' => $type, 'exception' => $e instanceof \Exception ? $e : null));
+                $type = \is_object($v) ? \get_class($v) : \gettype($v);
+                CacheItem::log($this->logger, 'Failed to save key "{key}" ({type})', array('key' => substr($id, \strlen($this->namespace)), 'type' => $type, 'exception' => $e instanceof \Exception ? $e : null));
             }
         }
 
diff --git a/src/Symfony/Component/Cache/Adapter/ArrayAdapter.php b/src/Symfony/Component/Cache/Adapter/ArrayAdapter.php
index fee7ed6d906d..830d6ddcede3 100644
--- a/src/Symfony/Component/Cache/Adapter/ArrayAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ArrayAdapter.php
@@ -121,7 +121,7 @@ public function save(CacheItemInterface $item)
             try {
                 $value = serialize($value);
             } catch (\Exception $e) {
-                $type = is_object($value) ? get_class($value) : gettype($value);
+                $type = \is_object($value) ? \get_class($value) : \gettype($value);
                 CacheItem::log($this->logger, 'Failed to save key "{key}" ({type})', array('key' => $key, 'type' => $type, 'exception' => $e));
 
                 return false;
diff --git a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
index 98b0cc24693b..db0da4fb5b21 100644
--- a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
@@ -44,7 +44,7 @@ public function __construct(array $adapters, int $defaultLifetime = 0)
 
         foreach ($adapters as $adapter) {
             if (!$adapter instanceof CacheItemPoolInterface) {
-                throw new InvalidArgumentException(sprintf('The class "%s" does not implement the "%s" interface.', get_class($adapter), CacheItemPoolInterface::class));
+                throw new InvalidArgumentException(sprintf('The class "%s" does not implement the "%s" interface.', \get_class($adapter), CacheItemPoolInterface::class));
             }
 
             if ($adapter instanceof AdapterInterface) {
@@ -53,7 +53,7 @@ public function __construct(array $adapters, int $defaultLifetime = 0)
                 $this->adapters[] = new ProxyAdapter($adapter);
             }
         }
-        $this->adapterCount = count($this->adapters);
+        $this->adapterCount = \count($this->adapters);
 
         $this->syncItem = \Closure::bind(
             function ($sourceItem, $item) use ($defaultLifetime) {
diff --git a/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php b/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
index 02b12b237114..f22f85301bc2 100644
--- a/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
@@ -83,7 +83,7 @@ public static function create($file, CacheItemPoolInterface $fallbackPool)
     public function getItem($key)
     {
         if (!\is_string($key)) {
-            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
         }
         if (null === $this->values) {
             $this->initialize();
@@ -118,7 +118,7 @@ public function getItems(array $keys = array())
     {
         foreach ($keys as $key) {
             if (!\is_string($key)) {
-                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
             }
         }
         if (null === $this->values) {
@@ -134,7 +134,7 @@ public function getItems(array $keys = array())
     public function hasItem($key)
     {
         if (!\is_string($key)) {
-            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
         }
         if (null === $this->values) {
             $this->initialize();
@@ -149,7 +149,7 @@ public function hasItem($key)
     public function deleteItem($key)
     {
         if (!\is_string($key)) {
-            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
         }
         if (null === $this->values) {
             $this->initialize();
@@ -168,7 +168,7 @@ public function deleteItems(array $keys)
 
         foreach ($keys as $key) {
             if (!\is_string($key)) {
-                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
             }
 
             if (isset($this->values[$key])) {
diff --git a/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php b/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
index da286dbf173f..0d4fcc472554 100644
--- a/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
@@ -35,7 +35,7 @@ public function __construct(CacheItemPoolInterface $pool, string $namespace = ''
         $this->pool = $pool;
         $this->poolHash = $poolHash = spl_object_hash($pool);
         $this->namespace = '' === $namespace ? '' : CacheItem::validateKey($namespace);
-        $this->namespaceLen = strlen($namespace);
+        $this->namespaceLen = \strlen($namespace);
         $this->createCacheItem = \Closure::bind(
             function ($key, $innerItem) use ($defaultLifetime, $poolHash) {
                 $item = new CacheItem();
diff --git a/src/Symfony/Component/Cache/CacheItem.php b/src/Symfony/Component/Cache/CacheItem.php
index cecaa126d912..58ecad82d2d4 100644
--- a/src/Symfony/Component/Cache/CacheItem.php
+++ b/src/Symfony/Component/Cache/CacheItem.php
@@ -74,7 +74,7 @@ public function expiresAt($expiration)
         } elseif ($expiration instanceof \DateTimeInterface) {
             $this->expiry = (int) $expiration->format('U');
         } else {
-            throw new InvalidArgumentException(sprintf('Expiration date must implement DateTimeInterface or be null, "%s" given', is_object($expiration) ? get_class($expiration) : gettype($expiration)));
+            throw new InvalidArgumentException(sprintf('Expiration date must implement DateTimeInterface or be null, "%s" given', \is_object($expiration) ? \get_class($expiration) : \gettype($expiration)));
         }
 
         return $this;
@@ -92,7 +92,7 @@ public function expiresAfter($time)
         } elseif (\is_int($time)) {
             $this->expiry = $time + time();
         } else {
-            throw new InvalidArgumentException(sprintf('Expiration date must be an integer, a DateInterval or null, "%s" given', is_object($time) ? get_class($time) : gettype($time)));
+            throw new InvalidArgumentException(sprintf('Expiration date must be an integer, a DateInterval or null, "%s" given', \is_object($time) ? \get_class($time) : \gettype($time)));
         }
 
         return $this;
@@ -114,7 +114,7 @@ public function tag($tags)
         }
         foreach ($tags as $tag) {
             if (!\is_string($tag)) {
-                throw new InvalidArgumentException(sprintf('Cache tag must be string, "%s" given', is_object($tag) ? get_class($tag) : gettype($tag)));
+                throw new InvalidArgumentException(sprintf('Cache tag must be string, "%s" given', \is_object($tag) ? \get_class($tag) : \gettype($tag)));
             }
             if (isset($this->tags[$tag])) {
                 continue;
@@ -153,7 +153,7 @@ public function getPreviousTags()
     public static function validateKey($key)
     {
         if (!\is_string($key)) {
-            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given', is_object($key) ? get_class($key) : gettype($key)));
+            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given', \is_object($key) ? \get_class($key) : \gettype($key)));
         }
         if ('' === $key) {
             throw new InvalidArgumentException('Cache key length must be greater than zero');
diff --git a/src/Symfony/Component/Cache/Simple/AbstractCache.php b/src/Symfony/Component/Cache/Simple/AbstractCache.php
index d708496337d3..08456f588f93 100644
--- a/src/Symfony/Component/Cache/Simple/AbstractCache.php
+++ b/src/Symfony/Component/Cache/Simple/AbstractCache.php
@@ -15,8 +15,8 @@
 use Psr\SimpleCache\CacheInterface;
 use Symfony\Component\Cache\CacheItem;
 use Symfony\Component\Cache\Exception\InvalidArgumentException;
-use Symfony\Component\Cache\Traits\AbstractTrait;
 use Symfony\Component\Cache\ResettableInterface;
+use Symfony\Component\Cache\Traits\AbstractTrait;
 
 /**
  * @author Nicolas Grekas <p@tchwork.com>
@@ -35,8 +35,8 @@ protected function __construct(string $namespace = '', int $defaultLifetime = 0)
     {
         $this->defaultLifetime = max(0, $defaultLifetime);
         $this->namespace = '' === $namespace ? '' : CacheItem::validateKey($namespace).':';
-        if (null !== $this->maxIdLength && strlen($namespace) > $this->maxIdLength - 24) {
-            throw new InvalidArgumentException(sprintf('Namespace must be %d chars max, %d given ("%s")', $this->maxIdLength - 24, strlen($namespace), $namespace));
+        if (null !== $this->maxIdLength && \strlen($namespace) > $this->maxIdLength - 24) {
+            throw new InvalidArgumentException(sprintf('Namespace must be %d chars max, %d given ("%s")', $this->maxIdLength - 24, \strlen($namespace), $namespace));
         }
     }
 
@@ -76,7 +76,7 @@ public function getMultiple($keys, $default = null)
         if ($keys instanceof \Traversable) {
             $keys = iterator_to_array($keys, false);
         } elseif (!\is_array($keys)) {
-            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', is_object($keys) ? get_class($keys) : gettype($keys)));
+            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', \is_object($keys) ? \get_class($keys) : \gettype($keys)));
         }
         $ids = array();
 
@@ -100,7 +100,7 @@ public function getMultiple($keys, $default = null)
     public function setMultiple($values, $ttl = null)
     {
         if (!\is_array($values) && !$values instanceof \Traversable) {
-            throw new InvalidArgumentException(sprintf('Cache values must be array or Traversable, "%s" given', is_object($values) ? get_class($values) : gettype($values)));
+            throw new InvalidArgumentException(sprintf('Cache values must be array or Traversable, "%s" given', \is_object($values) ? \get_class($values) : \gettype($values)));
         }
         $valuesById = array();
 
@@ -123,7 +123,7 @@ public function setMultiple($values, $ttl = null)
         }
         $keys = array();
         foreach (\is_array($e) ? $e : array_keys($valuesById) as $id) {
-            $keys[] = substr($id, strlen($this->namespace));
+            $keys[] = substr($id, \strlen($this->namespace));
         }
         CacheItem::log($this->logger, 'Failed to save values', array('keys' => $keys, 'exception' => $e instanceof \Exception ? $e : null));
 
@@ -138,7 +138,7 @@ public function deleteMultiple($keys)
         if ($keys instanceof \Traversable) {
             $keys = iterator_to_array($keys, false);
         } elseif (!\is_array($keys)) {
-            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', is_object($keys) ? get_class($keys) : gettype($keys)));
+            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', \is_object($keys) ? \get_class($keys) : \gettype($keys)));
         }
 
         return $this->deleteItems($keys);
@@ -156,7 +156,7 @@ private function normalizeTtl($ttl)
             return 0 < $ttl ? $ttl : false;
         }
 
-        throw new InvalidArgumentException(sprintf('Expiration date must be an integer, a DateInterval or null, "%s" given', is_object($ttl) ? get_class($ttl) : gettype($ttl)));
+        throw new InvalidArgumentException(sprintf('Expiration date must be an integer, a DateInterval or null, "%s" given', \is_object($ttl) ? \get_class($ttl) : \gettype($ttl)));
     }
 
     private function generateValues($values, &$keys, $default)
diff --git a/src/Symfony/Component/Cache/Simple/ArrayCache.php b/src/Symfony/Component/Cache/Simple/ArrayCache.php
index d1ef583125b8..aadefe204664 100644
--- a/src/Symfony/Component/Cache/Simple/ArrayCache.php
+++ b/src/Symfony/Component/Cache/Simple/ArrayCache.php
@@ -58,7 +58,7 @@ public function getMultiple($keys, $default = null)
         if ($keys instanceof \Traversable) {
             $keys = iterator_to_array($keys, false);
         } elseif (!\is_array($keys)) {
-            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', is_object($keys) ? get_class($keys) : gettype($keys)));
+            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', \is_object($keys) ? \get_class($keys) : \gettype($keys)));
         }
         foreach ($keys as $key) {
             CacheItem::validateKey($key);
@@ -73,7 +73,7 @@ public function getMultiple($keys, $default = null)
     public function deleteMultiple($keys)
     {
         if (!\is_array($keys) && !$keys instanceof \Traversable) {
-            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', is_object($keys) ? get_class($keys) : gettype($keys)));
+            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', \is_object($keys) ? \get_class($keys) : \gettype($keys)));
         }
         foreach ($keys as $key) {
             $this->delete($key);
@@ -98,7 +98,7 @@ public function set($key, $value, $ttl = null)
     public function setMultiple($values, $ttl = null)
     {
         if (!\is_array($values) && !$values instanceof \Traversable) {
-            throw new InvalidArgumentException(sprintf('Cache values must be array or Traversable, "%s" given', is_object($values) ? get_class($values) : gettype($values)));
+            throw new InvalidArgumentException(sprintf('Cache values must be array or Traversable, "%s" given', \is_object($values) ? \get_class($values) : \gettype($values)));
         }
         $valuesArray = array();
 
@@ -114,7 +114,7 @@ public function setMultiple($values, $ttl = null)
                 try {
                     $valuesArray[$key] = serialize($value);
                 } catch (\Exception $e) {
-                    $type = is_object($value) ? get_class($value) : gettype($value);
+                    $type = \is_object($value) ? \get_class($value) : \gettype($value);
                     CacheItem::log($this->logger, 'Failed to save key "{key}" ({type})', array('key' => $key, 'type' => $type, 'exception' => $e));
 
                     return false;
@@ -143,6 +143,6 @@ private function normalizeTtl($ttl)
             return 0 < $ttl ? $ttl : false;
         }
 
-        throw new InvalidArgumentException(sprintf('Expiration date must be an integer, a DateInterval or null, "%s" given', is_object($ttl) ? get_class($ttl) : gettype($ttl)));
+        throw new InvalidArgumentException(sprintf('Expiration date must be an integer, a DateInterval or null, "%s" given', \is_object($ttl) ? \get_class($ttl) : \gettype($ttl)));
     }
 }
diff --git a/src/Symfony/Component/Cache/Simple/ChainCache.php b/src/Symfony/Component/Cache/Simple/ChainCache.php
index db97fc7de433..38c0a9b35965 100644
--- a/src/Symfony/Component/Cache/Simple/ChainCache.php
+++ b/src/Symfony/Component/Cache/Simple/ChainCache.php
@@ -43,13 +43,13 @@ public function __construct(array $caches, int $defaultLifetime = 0)
 
         foreach ($caches as $cache) {
             if (!$cache instanceof CacheInterface) {
-                throw new InvalidArgumentException(sprintf('The class "%s" does not implement the "%s" interface.', get_class($cache), CacheInterface::class));
+                throw new InvalidArgumentException(sprintf('The class "%s" does not implement the "%s" interface.', \get_class($cache), CacheInterface::class));
             }
         }
 
         $this->miss = new \stdClass();
         $this->caches = array_values($caches);
-        $this->cacheCount = count($this->caches);
+        $this->cacheCount = \count($this->caches);
         $this->defaultLifetime = 0 < $defaultLifetime ? $defaultLifetime : null;
     }
 
diff --git a/src/Symfony/Component/Cache/Simple/PhpArrayCache.php b/src/Symfony/Component/Cache/Simple/PhpArrayCache.php
index 64dc776f74a3..5186ded07732 100644
--- a/src/Symfony/Component/Cache/Simple/PhpArrayCache.php
+++ b/src/Symfony/Component/Cache/Simple/PhpArrayCache.php
@@ -13,9 +13,9 @@
 
 use Psr\SimpleCache\CacheInterface;
 use Symfony\Component\Cache\Exception\InvalidArgumentException;
-use Symfony\Component\Cache\Traits\PhpArrayTrait;
 use Symfony\Component\Cache\PruneableInterface;
 use Symfony\Component\Cache\ResettableInterface;
+use Symfony\Component\Cache\Traits\PhpArrayTrait;
 
 /**
  * Caches items at warm up time using a PHP array that is stored in shared memory by OPCache since PHP 7.0.
@@ -62,7 +62,7 @@ public static function create($file, CacheInterface $fallbackPool)
     public function get($key, $default = null)
     {
         if (!\is_string($key)) {
-            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
         }
         if (null === $this->values) {
             $this->initialize();
@@ -95,11 +95,11 @@ public function getMultiple($keys, $default = null)
         if ($keys instanceof \Traversable) {
             $keys = iterator_to_array($keys, false);
         } elseif (!\is_array($keys)) {
-            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', is_object($keys) ? get_class($keys) : gettype($keys)));
+            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', \is_object($keys) ? \get_class($keys) : \gettype($keys)));
         }
         foreach ($keys as $key) {
             if (!\is_string($key)) {
-                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
             }
         }
         if (null === $this->values) {
@@ -115,7 +115,7 @@ public function getMultiple($keys, $default = null)
     public function has($key)
     {
         if (!\is_string($key)) {
-            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
         }
         if (null === $this->values) {
             $this->initialize();
@@ -130,7 +130,7 @@ public function has($key)
     public function delete($key)
     {
         if (!\is_string($key)) {
-            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
         }
         if (null === $this->values) {
             $this->initialize();
@@ -145,7 +145,7 @@ public function delete($key)
     public function deleteMultiple($keys)
     {
         if (!\is_array($keys) && !$keys instanceof \Traversable) {
-            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', is_object($keys) ? get_class($keys) : gettype($keys)));
+            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', \is_object($keys) ? \get_class($keys) : \gettype($keys)));
         }
 
         $deleted = true;
@@ -153,7 +153,7 @@ public function deleteMultiple($keys)
 
         foreach ($keys as $key) {
             if (!\is_string($key)) {
-                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
             }
 
             if (isset($this->values[$key])) {
@@ -179,7 +179,7 @@ public function deleteMultiple($keys)
     public function set($key, $value, $ttl = null)
     {
         if (!\is_string($key)) {
-            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+            throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
         }
         if (null === $this->values) {
             $this->initialize();
@@ -194,7 +194,7 @@ public function set($key, $value, $ttl = null)
     public function setMultiple($values, $ttl = null)
     {
         if (!\is_array($values) && !$values instanceof \Traversable) {
-            throw new InvalidArgumentException(sprintf('Cache values must be array or Traversable, "%s" given', is_object($values) ? get_class($values) : gettype($values)));
+            throw new InvalidArgumentException(sprintf('Cache values must be array or Traversable, "%s" given', \is_object($values) ? \get_class($values) : \gettype($values)));
         }
 
         $saved = true;
@@ -202,7 +202,7 @@ public function setMultiple($values, $ttl = null)
 
         foreach ($values as $key => $value) {
             if (!\is_string($key) && !\is_int($key)) {
-                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', is_object($key) ? get_class($key) : gettype($key)));
+                throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', \is_object($key) ? \get_class($key) : \gettype($key)));
             }
 
             if (isset($this->values[$key])) {
diff --git a/src/Symfony/Component/Cache/Simple/Psr6Cache.php b/src/Symfony/Component/Cache/Simple/Psr6Cache.php
index 4a71346d2ce5..482aa137100f 100644
--- a/src/Symfony/Component/Cache/Simple/Psr6Cache.php
+++ b/src/Symfony/Component/Cache/Simple/Psr6Cache.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Cache\Simple;
 
-use Psr\Cache\CacheItemPoolInterface;
 use Psr\Cache\CacheException as Psr6CacheException;
-use Psr\SimpleCache\CacheInterface;
+use Psr\Cache\CacheItemPoolInterface;
 use Psr\SimpleCache\CacheException as SimpleCacheException;
+use Psr\SimpleCache\CacheInterface;
 use Symfony\Component\Cache\Adapter\AbstractAdapter;
 use Symfony\Component\Cache\CacheItem;
 use Symfony\Component\Cache\Exception\InvalidArgumentException;
@@ -122,7 +122,7 @@ public function getMultiple($keys, $default = null)
         if ($keys instanceof \Traversable) {
             $keys = iterator_to_array($keys, false);
         } elseif (!\is_array($keys)) {
-            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', is_object($keys) ? get_class($keys) : gettype($keys)));
+            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', \is_object($keys) ? \get_class($keys) : \gettype($keys)));
         }
 
         try {
@@ -148,7 +148,7 @@ public function setMultiple($values, $ttl = null)
     {
         $valuesIsArray = \is_array($values);
         if (!$valuesIsArray && !$values instanceof \Traversable) {
-            throw new InvalidArgumentException(sprintf('Cache values must be array or Traversable, "%s" given', is_object($values) ? get_class($values) : gettype($values)));
+            throw new InvalidArgumentException(sprintf('Cache values must be array or Traversable, "%s" given', \is_object($values) ? \get_class($values) : \gettype($values)));
         }
         $items = array();
 
@@ -200,7 +200,7 @@ public function deleteMultiple($keys)
         if ($keys instanceof \Traversable) {
             $keys = iterator_to_array($keys, false);
         } elseif (!\is_array($keys)) {
-            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', is_object($keys) ? get_class($keys) : gettype($keys)));
+            throw new InvalidArgumentException(sprintf('Cache keys must be array or Traversable, "%s" given', \is_object($keys) ? \get_class($keys) : \gettype($keys)));
         }
 
         try {
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/AbstractRedisAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/AbstractRedisAdapterTest.php
index d9353821ae6e..147dfcd15346 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/AbstractRedisAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/AbstractRedisAdapterTest.php
@@ -30,7 +30,7 @@ public function createCachePool($defaultLifetime = 0)
 
     public static function setupBeforeClass()
     {
-        if (!extension_loaded('redis')) {
+        if (!\extension_loaded('redis')) {
             self::markTestSkipped('Extension redis required.');
         }
         if (!@((new \Redis())->connect(getenv('REDIS_HOST')))) {
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/ApcuAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/ApcuAdapterTest.php
index 72df12e4b593..2b3c6b443247 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/ApcuAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/ApcuAdapterTest.php
@@ -24,15 +24,15 @@ class ApcuAdapterTest extends AdapterTestCase
 
     public function createCachePool($defaultLifetime = 0)
     {
-        if (!function_exists('apcu_fetch') || !ini_get('apc.enabled')) {
+        if (!\function_exists('apcu_fetch') || !ini_get('apc.enabled')) {
             $this->markTestSkipped('APCu extension is required.');
         }
-        if ('cli' === PHP_SAPI && !ini_get('apc.enable_cli')) {
+        if ('cli' === \PHP_SAPI && !ini_get('apc.enable_cli')) {
             if ('testWithCliSapi' !== $this->getName()) {
                 $this->markTestSkipped('apc.enable_cli=1 is required.');
             }
         }
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Fails transiently on Windows.');
         }
 
@@ -54,7 +54,7 @@ public function testUnserializable()
 
     public function testVersion()
     {
-        $namespace = str_replace('\\', '.', get_class($this));
+        $namespace = str_replace('\\', '.', \get_class($this));
 
         $pool1 = new ApcuAdapter($namespace, 0, 'p1');
 
@@ -79,7 +79,7 @@ public function testVersion()
 
     public function testNamespace()
     {
-        $namespace = str_replace('\\', '.', get_class($this));
+        $namespace = str_replace('\\', '.', \get_class($this));
 
         $pool1 = new ApcuAdapter($namespace.'_1', 0, 'p1');
 
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/ChainAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/ChainAdapterTest.php
index 293a90cc8678..a47058f513a4 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/ChainAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/ChainAdapterTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Cache\Tests\Adapter;
 
 use Symfony\Component\Cache\Adapter\AdapterInterface;
-use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 use Symfony\Component\Cache\Adapter\ArrayAdapter;
 use Symfony\Component\Cache\Adapter\ChainAdapter;
+use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 use Symfony\Component\Cache\PruneableInterface;
 use Symfony\Component\Cache\Tests\Fixtures\ExternalAdapter;
 
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/FilesystemAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/FilesystemAdapterTest.php
index b6757514eb67..fa8306826e5d 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/FilesystemAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/FilesystemAdapterTest.php
@@ -34,7 +34,7 @@ public static function rmdir($dir)
         if (!file_exists($dir)) {
             return;
         }
-        if (!$dir || 0 !== strpos(dirname($dir), sys_get_temp_dir())) {
+        if (!$dir || 0 !== strpos(\dirname($dir), sys_get_temp_dir())) {
             throw new \Exception(__METHOD__."() operates only on subdirs of system's temp dir");
         }
         $children = new \RecursiveIteratorIterator(
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/MaxIdLengthAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/MaxIdLengthAdapterTest.php
index 266e1f850c95..5e301f250986 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/MaxIdLengthAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/MaxIdLengthAdapterTest.php
@@ -47,9 +47,9 @@ public function testLongKeyVersioning()
 
         // No versioning enabled
         $this->assertEquals('--------------------------:------------', $reflectionMethod->invokeArgs($cache, array(str_repeat('-', 12))));
-        $this->assertLessThanOrEqual(50, strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 12)))));
-        $this->assertLessThanOrEqual(50, strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 23)))));
-        $this->assertLessThanOrEqual(50, strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 40)))));
+        $this->assertLessThanOrEqual(50, \strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 12)))));
+        $this->assertLessThanOrEqual(50, \strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 23)))));
+        $this->assertLessThanOrEqual(50, \strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 40)))));
 
         $reflectionProperty = $reflectionClass->getProperty('versioningIsEnabled');
         $reflectionProperty->setAccessible(true);
@@ -57,9 +57,9 @@ public function testLongKeyVersioning()
 
         // Versioning enabled
         $this->assertEquals('--------------------------:1:------------', $reflectionMethod->invokeArgs($cache, array(str_repeat('-', 12))));
-        $this->assertLessThanOrEqual(50, strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 12)))));
-        $this->assertLessThanOrEqual(50, strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 23)))));
-        $this->assertLessThanOrEqual(50, strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 40)))));
+        $this->assertLessThanOrEqual(50, \strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 12)))));
+        $this->assertLessThanOrEqual(50, \strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 23)))));
+        $this->assertLessThanOrEqual(50, \strlen($reflectionMethod->invokeArgs($cache, array(str_repeat('-', 40)))));
     }
 
     /**
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/PdoAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/PdoAdapterTest.php
index 24e3f9bbc958..b587cf6d62d9 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/PdoAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/PdoAdapterTest.php
@@ -25,7 +25,7 @@ class PdoAdapterTest extends AdapterTestCase
 
     public static function setupBeforeClass()
     {
-        if (!extension_loaded('pdo_sqlite')) {
+        if (!\extension_loaded('pdo_sqlite')) {
             self::markTestSkipped('Extension pdo_sqlite required.');
         }
 
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/PdoDbalAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/PdoDbalAdapterTest.php
index 1e8c6155bdd3..f89a27ce6482 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/PdoDbalAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/PdoDbalAdapterTest.php
@@ -26,7 +26,7 @@ class PdoDbalAdapterTest extends AdapterTestCase
 
     public static function setupBeforeClass()
     {
-        if (!extension_loaded('pdo_sqlite')) {
+        if (!\extension_loaded('pdo_sqlite')) {
             self::markTestSkipped('Extension pdo_sqlite required.');
         }
 
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
index 14b61263c589..930594fb92a8 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
@@ -122,7 +122,7 @@ class PhpArrayAdapterWrapper extends PhpArrayAdapter
 {
     public function save(CacheItemInterface $item)
     {
-        call_user_func(\Closure::bind(function () use ($item) {
+        \call_user_func(\Closure::bind(function () use ($item) {
             $this->values[$item->getKey()] = $item->get();
             $this->warmUp($this->values);
             $this->values = eval(substr(file_get_contents($this->file), 6));
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/SimpleCacheAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/SimpleCacheAdapterTest.php
index d5795d52e712..460f3b09541b 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/SimpleCacheAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/SimpleCacheAdapterTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Cache\Tests\Adapter;
 
-use Symfony\Component\Cache\Simple\FilesystemCache;
 use Symfony\Component\Cache\Adapter\SimpleCacheAdapter;
+use Symfony\Component\Cache\Simple\FilesystemCache;
 
 /**
  * @group time-sensitive
diff --git a/src/Symfony/Component/Cache/Tests/CacheItemTest.php b/src/Symfony/Component/Cache/Tests/CacheItemTest.php
index daca925fd5b7..4aae16b63ca4 100644
--- a/src/Symfony/Component/Cache/Tests/CacheItemTest.php
+++ b/src/Symfony/Component/Cache/Tests/CacheItemTest.php
@@ -59,7 +59,7 @@ public function testTag()
         $this->assertSame($item, $item->tag('foo'));
         $this->assertSame($item, $item->tag(array('bar', 'baz')));
 
-        call_user_func(\Closure::bind(function () use ($item) {
+        \call_user_func(\Closure::bind(function () use ($item) {
             $this->assertSame(array('foo' => 'foo', 'bar' => 'bar', 'baz' => 'baz'), $item->tags);
         }, $this, CacheItem::class));
     }
diff --git a/src/Symfony/Component/Cache/Tests/Simple/AbstractRedisCacheTest.php b/src/Symfony/Component/Cache/Tests/Simple/AbstractRedisCacheTest.php
index f70f49d5dbaa..3e668fdd123b 100644
--- a/src/Symfony/Component/Cache/Tests/Simple/AbstractRedisCacheTest.php
+++ b/src/Symfony/Component/Cache/Tests/Simple/AbstractRedisCacheTest.php
@@ -30,7 +30,7 @@ public function createSimpleCache($defaultLifetime = 0)
 
     public static function setupBeforeClass()
     {
-        if (!extension_loaded('redis')) {
+        if (!\extension_loaded('redis')) {
             self::markTestSkipped('Extension redis required.');
         }
         if (!@((new \Redis())->connect(getenv('REDIS_HOST')))) {
diff --git a/src/Symfony/Component/Cache/Tests/Simple/ApcuCacheTest.php b/src/Symfony/Component/Cache/Tests/Simple/ApcuCacheTest.php
index 297a41756f42..737ed4e99dd0 100644
--- a/src/Symfony/Component/Cache/Tests/Simple/ApcuCacheTest.php
+++ b/src/Symfony/Component/Cache/Tests/Simple/ApcuCacheTest.php
@@ -23,10 +23,10 @@ class ApcuCacheTest extends CacheTestCase
 
     public function createSimpleCache($defaultLifetime = 0)
     {
-        if (!function_exists('apcu_fetch') || !ini_get('apc.enabled') || ('cli' === PHP_SAPI && !ini_get('apc.enable_cli'))) {
+        if (!\function_exists('apcu_fetch') || !ini_get('apc.enabled') || ('cli' === \PHP_SAPI && !ini_get('apc.enable_cli'))) {
             $this->markTestSkipped('APCu extension is required.');
         }
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Fails transiently on Windows.');
         }
 
diff --git a/src/Symfony/Component/Cache/Tests/Simple/PdoCacheTest.php b/src/Symfony/Component/Cache/Tests/Simple/PdoCacheTest.php
index cf5730952dd8..665db09f672a 100644
--- a/src/Symfony/Component/Cache/Tests/Simple/PdoCacheTest.php
+++ b/src/Symfony/Component/Cache/Tests/Simple/PdoCacheTest.php
@@ -25,7 +25,7 @@ class PdoCacheTest extends CacheTestCase
 
     public static function setupBeforeClass()
     {
-        if (!extension_loaded('pdo_sqlite')) {
+        if (!\extension_loaded('pdo_sqlite')) {
             self::markTestSkipped('Extension pdo_sqlite required.');
         }
 
diff --git a/src/Symfony/Component/Cache/Tests/Simple/PdoDbalCacheTest.php b/src/Symfony/Component/Cache/Tests/Simple/PdoDbalCacheTest.php
index 0c40c04a2cae..158e2c892490 100644
--- a/src/Symfony/Component/Cache/Tests/Simple/PdoDbalCacheTest.php
+++ b/src/Symfony/Component/Cache/Tests/Simple/PdoDbalCacheTest.php
@@ -26,7 +26,7 @@ class PdoDbalCacheTest extends CacheTestCase
 
     public static function setupBeforeClass()
     {
-        if (!extension_loaded('pdo_sqlite')) {
+        if (!\extension_loaded('pdo_sqlite')) {
             self::markTestSkipped('Extension pdo_sqlite required.');
         }
 
diff --git a/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheTest.php b/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheTest.php
index 1bd0ca2778bb..b4862c61bd93 100644
--- a/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheTest.php
+++ b/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Cache\Tests\Simple;
 
-use Symfony\Component\Cache\Tests\Adapter\FilesystemAdapterTest;
 use Symfony\Component\Cache\Simple\NullCache;
 use Symfony\Component\Cache\Simple\PhpArrayCache;
+use Symfony\Component\Cache\Tests\Adapter\FilesystemAdapterTest;
 
 /**
  * @group time-sensitive
@@ -116,7 +116,7 @@ class PhpArrayCacheWrapper extends PhpArrayCache
 {
     public function set($key, $value, $ttl = null)
     {
-        call_user_func(\Closure::bind(function () use ($key, $value) {
+        \call_user_func(\Closure::bind(function () use ($key, $value) {
             $this->values[$key] = $value;
             $this->warmUp($this->values);
             $this->values = eval(substr(file_get_contents($this->file), 6));
@@ -127,10 +127,10 @@ public function set($key, $value, $ttl = null)
 
     public function setMultiple($values, $ttl = null)
     {
-        if (!is_array($values) && !$values instanceof \Traversable) {
+        if (!\is_array($values) && !$values instanceof \Traversable) {
             return parent::setMultiple($values, $ttl);
         }
-        call_user_func(\Closure::bind(function () use ($values) {
+        \call_user_func(\Closure::bind(function () use ($values) {
             foreach ($values as $key => $value) {
                 $this->values[$key] = $value;
             }
diff --git a/src/Symfony/Component/Cache/Tests/Traits/PdoPruneableTrait.php b/src/Symfony/Component/Cache/Tests/Traits/PdoPruneableTrait.php
index a9c459fb8717..3b1e1128ba0d 100644
--- a/src/Symfony/Component/Cache/Tests/Traits/PdoPruneableTrait.php
+++ b/src/Symfony/Component/Cache/Tests/Traits/PdoPruneableTrait.php
@@ -29,6 +29,6 @@ protected function isPruned($cache, $name)
         $select->bindValue(':id', sprintf('%%%s', $name));
         $select->execute();
 
-        return 0 === count($select->fetchAll(\PDO::FETCH_COLUMN));
+        return 0 === \count($select->fetchAll(\PDO::FETCH_COLUMN));
     }
 }
diff --git a/src/Symfony/Component/Cache/Traits/ApcuTrait.php b/src/Symfony/Component/Cache/Traits/ApcuTrait.php
index cec621b868f4..4812e80f306d 100644
--- a/src/Symfony/Component/Cache/Traits/ApcuTrait.php
+++ b/src/Symfony/Component/Cache/Traits/ApcuTrait.php
@@ -23,7 +23,7 @@ trait ApcuTrait
 {
     public static function isSupported()
     {
-        return function_exists('apcu_fetch') && ini_get('apc.enabled');
+        return \function_exists('apcu_fetch') && ini_get('apc.enabled');
     }
 
     private function init($namespace, $defaultLifetime, $version)
@@ -31,7 +31,7 @@ private function init($namespace, $defaultLifetime, $version)
         if (!static::isSupported()) {
             throw new CacheException('APCu is not enabled');
         }
-        if ('cli' === PHP_SAPI) {
+        if ('cli' === \PHP_SAPI) {
             ini_set('apc.use_request_time', 0);
         }
         parent::__construct($namespace, $defaultLifetime);
@@ -75,7 +75,7 @@ protected function doHave($id)
      */
     protected function doClear($namespace)
     {
-        return isset($namespace[0]) && class_exists('APCuIterator', false) && ('cli' !== PHP_SAPI || ini_get('apc.enable_cli'))
+        return isset($namespace[0]) && class_exists('APCuIterator', false) && ('cli' !== \PHP_SAPI || ini_get('apc.enable_cli'))
             ? apcu_delete(new \APCuIterator(sprintf('/^%s/', preg_quote($namespace, '/')), APC_ITER_KEY))
             : apcu_clear_cache();
     }
@@ -104,7 +104,7 @@ protected function doSave(array $values, $lifetime)
 
             return array_keys($failures);
         } catch (\Throwable $e) {
-            if (1 === count($values)) {
+            if (1 === \count($values)) {
                 // Workaround https://github.com/krakjoe/apcu/issues/170
                 apcu_delete(key($values));
             }
diff --git a/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php b/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
index b0f495e4d4c5..274eb7325965 100644
--- a/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
+++ b/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
@@ -34,14 +34,14 @@ private function init($namespace, $directory)
             if (preg_match('#[^-+_.A-Za-z0-9]#', $namespace, $match)) {
                 throw new InvalidArgumentException(sprintf('Namespace contains "%s" but only characters in [-+_.A-Za-z0-9] are allowed.', $match[0]));
             }
-            $directory .= DIRECTORY_SEPARATOR.$namespace;
+            $directory .= \DIRECTORY_SEPARATOR.$namespace;
         }
         if (!file_exists($directory)) {
             @mkdir($directory, 0777, true);
         }
-        $directory .= DIRECTORY_SEPARATOR;
+        $directory .= \DIRECTORY_SEPARATOR;
         // On Windows the whole path is limited to 258 chars
-        if ('\\' === DIRECTORY_SEPARATOR && strlen($directory) > 234) {
+        if ('\\' === \DIRECTORY_SEPARATOR && \strlen($directory) > 234) {
             throw new InvalidArgumentException(sprintf('Cache directory too long (%s)', $directory));
         }
 
@@ -99,7 +99,7 @@ private function write($file, $data, $expiresAt = null)
     private function getFile($id, $mkdir = false)
     {
         $hash = str_replace('/', '-', base64_encode(hash('sha256', static::class.$id, true)));
-        $dir = $this->directory.strtoupper($hash[0].DIRECTORY_SEPARATOR.$hash[1].DIRECTORY_SEPARATOR);
+        $dir = $this->directory.strtoupper($hash[0].\DIRECTORY_SEPARATOR.$hash[1].\DIRECTORY_SEPARATOR);
 
         if ($mkdir && !file_exists($dir)) {
             @mkdir($dir, 0777, true);
diff --git a/src/Symfony/Component/Cache/Traits/MemcachedTrait.php b/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
index c0d43c2e61ba..7e3616429384 100644
--- a/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
+++ b/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
@@ -34,7 +34,7 @@ trait MemcachedTrait
 
     public static function isSupported()
     {
-        return extension_loaded('memcached') && version_compare(phpversion('memcached'), '2.2.0', '>=');
+        return \extension_loaded('memcached') && version_compare(phpversion('memcached'), '2.2.0', '>=');
     }
 
     private function init(\Memcached $client, $namespace, $defaultLifetime)
@@ -42,12 +42,12 @@ private function init(\Memcached $client, $namespace, $defaultLifetime)
         if (!static::isSupported()) {
             throw new CacheException('Memcached >= 2.2.0 is required');
         }
-        if ('Memcached' === get_class($client)) {
+        if ('Memcached' === \get_class($client)) {
             $opt = $client->getOption(\Memcached::OPT_SERIALIZER);
             if (\Memcached::SERIALIZER_PHP !== $opt && \Memcached::SERIALIZER_IGBINARY !== $opt) {
                 throw new CacheException('MemcachedAdapter: "serializer" option must be "php" or "igbinary".');
             }
-            $this->maxIdLength -= strlen($client->getOption(\Memcached::OPT_PREFIX_KEY));
+            $this->maxIdLength -= \strlen($client->getOption(\Memcached::OPT_PREFIX_KEY));
             $this->client = $client;
         } else {
             $this->lazyClient = $client;
@@ -75,10 +75,10 @@ private function init(\Memcached $client, $namespace, $defaultLifetime)
      */
     public static function createConnection($servers, array $options = array())
     {
-        if (is_string($servers)) {
+        if (\is_string($servers)) {
             $servers = array($servers);
-        } elseif (!is_array($servers)) {
-            throw new InvalidArgumentException(sprintf('MemcachedAdapter::createClient() expects array or string as first argument, %s given.', gettype($servers)));
+        } elseif (!\is_array($servers)) {
+            throw new InvalidArgumentException(sprintf('MemcachedAdapter::createClient() expects array or string as first argument, %s given.', \gettype($servers)));
         }
         if (!static::isSupported()) {
             throw new CacheException('Memcached >= 2.2.0 is required');
@@ -92,7 +92,7 @@ public static function createConnection($servers, array $options = array())
 
             // parse any DSN in $servers
             foreach ($servers as $i => $dsn) {
-                if (is_array($dsn)) {
+                if (\is_array($dsn)) {
                     continue;
                 }
                 if (0 !== strpos($dsn, 'memcached://')) {
@@ -113,7 +113,7 @@ public static function createConnection($servers, array $options = array())
                 }
                 if (isset($params['path']) && preg_match('#/(\d+)$#', $params['path'], $m)) {
                     $params['weight'] = $m[1];
-                    $params['path'] = substr($params['path'], 0, -strlen($m[0]));
+                    $params['path'] = substr($params['path'], 0, -\strlen($m[0]));
                 }
                 $params += array(
                     'host' => isset($params['host']) ? $params['host'] : $params['path'],
@@ -138,13 +138,13 @@ public static function createConnection($servers, array $options = array())
                 $client->setOption(\Memcached::OPT_LIBKETAMA_COMPATIBLE, true);
             }
             foreach ($options as $name => $value) {
-                if (is_int($name)) {
+                if (\is_int($name)) {
                     continue;
                 }
                 if ('HASH' === $name || 'SERIALIZER' === $name || 'DISTRIBUTION' === $name) {
-                    $value = constant('Memcached::'.$name.'_'.strtoupper($value));
+                    $value = \constant('Memcached::'.$name.'_'.strtoupper($value));
                 }
-                $opt = constant('Memcached::OPT_'.$name);
+                $opt = \constant('Memcached::OPT_'.$name);
 
                 unset($options[$name]);
                 $options[$opt] = $value;
@@ -160,7 +160,7 @@ public static function createConnection($servers, array $options = array())
 
                 $newServers = array();
                 foreach ($servers as $server) {
-                    if (1 < count($server)) {
+                    if (1 < \count($server)) {
                         $server = array_values($server);
                         unset($server[2]);
                         $server[1] = (int) $server[1];
diff --git a/src/Symfony/Component/Cache/Traits/PdoTrait.php b/src/Symfony/Component/Cache/Traits/PdoTrait.php
index a88099ecb183..a22714c80ff6 100644
--- a/src/Symfony/Component/Cache/Traits/PdoTrait.php
+++ b/src/Symfony/Component/Cache/Traits/PdoTrait.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Cache\Traits;
 
 use Doctrine\DBAL\Connection;
-use Doctrine\DBAL\Driver\ServerInfoAwareConnection;
 use Doctrine\DBAL\DBALException;
+use Doctrine\DBAL\Driver\ServerInfoAwareConnection;
 use Doctrine\DBAL\Schema\Schema;
 use Symfony\Component\Cache\Exception\InvalidArgumentException;
 
@@ -50,10 +50,10 @@ private function init($connOrDsn, $namespace, $defaultLifetime, array $options)
             $this->conn = $connOrDsn;
         } elseif ($connOrDsn instanceof Connection) {
             $this->conn = $connOrDsn;
-        } elseif (is_string($connOrDsn)) {
+        } elseif (\is_string($connOrDsn)) {
             $this->dsn = $connOrDsn;
         } else {
-            throw new InvalidArgumentException(sprintf('"%s" requires PDO or Doctrine\DBAL\Connection instance or DSN string as first argument, "%s" given.', __CLASS__, is_object($connOrDsn) ? get_class($connOrDsn) : gettype($connOrDsn)));
+            throw new InvalidArgumentException(sprintf('"%s" requires PDO or Doctrine\DBAL\Connection instance or DSN string as first argument, "%s" given.', __CLASS__, \is_object($connOrDsn) ? \get_class($connOrDsn) : \gettype($connOrDsn)));
         }
 
         $this->table = isset($options['db_table']) ? $options['db_table'] : $this->table;
@@ -168,7 +168,7 @@ protected function doFetch(array $ids)
         $now = time();
         $expired = array();
 
-        $sql = str_pad('', (count($ids) << 1) - 1, '?,');
+        $sql = str_pad('', (\count($ids) << 1) - 1, '?,');
         $sql = "SELECT $this->idCol, CASE WHEN $this->lifetimeCol IS NULL OR $this->lifetimeCol + $this->timeCol > ? THEN $this->dataCol ELSE NULL END FROM $this->table WHERE $this->idCol IN ($sql)";
         $stmt = $this->getConnection()->prepare($sql);
         $stmt->bindValue($i = 1, $now, \PDO::PARAM_INT);
@@ -181,12 +181,12 @@ protected function doFetch(array $ids)
             if (null === $row[1]) {
                 $expired[] = $row[0];
             } else {
-                yield $row[0] => parent::unserialize(is_resource($row[1]) ? stream_get_contents($row[1]) : $row[1]);
+                yield $row[0] => parent::unserialize(\is_resource($row[1]) ? stream_get_contents($row[1]) : $row[1]);
             }
         }
 
         if ($expired) {
-            $sql = str_pad('', (count($expired) << 1) - 1, '?,');
+            $sql = str_pad('', (\count($expired) << 1) - 1, '?,');
             $sql = "DELETE FROM $this->table WHERE $this->lifetimeCol + $this->timeCol <= ? AND $this->idCol IN ($sql)";
             $stmt = $this->getConnection()->prepare($sql);
             $stmt->bindValue($i = 1, $now, \PDO::PARAM_INT);
@@ -239,7 +239,7 @@ protected function doClear($namespace)
      */
     protected function doDelete(array $ids)
     {
-        $sql = str_pad('', (count($ids) << 1) - 1, '?,');
+        $sql = str_pad('', (\count($ids) << 1) - 1, '?,');
         $sql = "DELETE FROM $this->table WHERE $this->idCol IN ($sql)";
         $stmt = $this->getConnection()->prepare($sql);
         $stmt->execute(array_values($ids));
diff --git a/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php b/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
index e90492b3a14d..65dded87c277 100644
--- a/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
+++ b/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
@@ -44,7 +44,7 @@ public function warmUp(array $values)
                 throw new InvalidArgumentException(sprintf('Cache file is not writable: %s.', $this->file));
             }
         } else {
-            $directory = dirname($this->file);
+            $directory = \dirname($this->file);
 
             if (!is_dir($directory) && !@mkdir($directory, 0777, true)) {
                 throw new InvalidArgumentException(sprintf('Cache directory does not exist and cannot be created: %s.', $directory));
@@ -72,7 +72,7 @@ public function warmUp(array $values)
                 try {
                     $value = serialize($value);
                 } catch (\Exception $e) {
-                    throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, get_class($value)), 0, $e);
+                    throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, \get_class($value)), 0, $e);
                 }
             } elseif (\is_array($value)) {
                 try {
@@ -91,7 +91,7 @@ public function warmUp(array $values)
                     $value = serialize($value);
                 }
             } elseif (!\is_scalar($value)) {
-                throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, gettype($value)));
+                throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, \gettype($value)));
             }
 
             $dump .= var_export($key, true).' => '.var_export($value, true).",\n";
diff --git a/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php b/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
index 32bbeb71237e..7728d17c53a8 100644
--- a/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
+++ b/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
@@ -30,7 +30,7 @@ trait PhpFilesTrait
 
     public static function isSupported()
     {
-        return function_exists('opcache_invalidate') && ini_get('opcache.enable');
+        return \function_exists('opcache_invalidate') && ini_get('opcache.enable');
     }
 
     /**
@@ -40,7 +40,7 @@ public function prune()
     {
         $time = time();
         $pruned = true;
-        $allowCompile = 'cli' !== PHP_SAPI || ini_get('opcache.enable_cli');
+        $allowCompile = 'cli' !== \PHP_SAPI || ini_get('opcache.enable_cli');
 
         set_error_handler($this->includeHandler);
         try {
@@ -119,7 +119,7 @@ protected function doSave(array $values, $lifetime)
     {
         $ok = true;
         $data = array($lifetime ? time() + $lifetime : PHP_INT_MAX, '');
-        $allowCompile = 'cli' !== PHP_SAPI || ini_get('opcache.enable_cli');
+        $allowCompile = 'cli' !== \PHP_SAPI || ini_get('opcache.enable_cli');
 
         foreach ($values as $key => $value) {
             if (null === $value || \is_object($value)) {
@@ -137,7 +137,7 @@ protected function doSave(array $values, $lifetime)
                     $value = serialize($value);
                 }
             } elseif (!\is_scalar($value)) {
-                throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, gettype($value)));
+                throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, \gettype($value)));
             }
 
             $data[1] = $value;
diff --git a/src/Symfony/Component/Cache/Traits/RedisTrait.php b/src/Symfony/Component/Cache/Traits/RedisTrait.php
index 5a9592a90154..77e3decf50a0 100644
--- a/src/Symfony/Component/Cache/Traits/RedisTrait.php
+++ b/src/Symfony/Component/Cache/Traits/RedisTrait.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Cache\Traits;
 
-use Predis\Connection\Factory;
 use Predis\Connection\Aggregate\ClusterInterface;
 use Predis\Connection\Aggregate\PredisCluster;
 use Predis\Connection\Aggregate\RedisCluster;
+use Predis\Connection\Factory;
 use Predis\Response\Status;
 use Symfony\Component\Cache\Exception\CacheException;
 use Symfony\Component\Cache\Exception\InvalidArgumentException;
@@ -51,7 +51,7 @@ private function init($redisClient, $namespace = '', $defaultLifetime = 0)
         if ($redisClient instanceof \RedisCluster) {
             $this->enableVersioning();
         } elseif (!$redisClient instanceof \Redis && !$redisClient instanceof \RedisArray && !$redisClient instanceof \Predis\Client && !$redisClient instanceof RedisProxy) {
-            throw new InvalidArgumentException(sprintf('%s() expects parameter 1 to be Redis, RedisArray, RedisCluster or Predis\Client, %s given', __METHOD__, is_object($redisClient) ? get_class($redisClient) : gettype($redisClient)));
+            throw new InvalidArgumentException(sprintf('%s() expects parameter 1 to be Redis, RedisArray, RedisCluster or Predis\Client, %s given', __METHOD__, \is_object($redisClient) ? \get_class($redisClient) : \gettype($redisClient)));
         }
         $this->redis = $redisClient;
     }
@@ -93,7 +93,7 @@ public static function createConnection($dsn, array $options = array())
         }
         if (isset($params['path']) && preg_match('#/(\d+)$#', $params['path'], $m)) {
             $params['dbindex'] = $m[1];
-            $params['path'] = substr($params['path'], 0, -strlen($m[0]));
+            $params['path'] = substr($params['path'], 0, -\strlen($m[0]));
         }
         if (isset($params['host'])) {
             $scheme = 'tcp';
@@ -110,10 +110,10 @@ public static function createConnection($dsn, array $options = array())
             $params += $query;
         }
         $params += $options + self::$defaultConnectionOptions;
-        if (null === $params['class'] && !extension_loaded('redis') && !class_exists(\Predis\Client::class)) {
+        if (null === $params['class'] && !\extension_loaded('redis') && !class_exists(\Predis\Client::class)) {
             throw new CacheException(sprintf('Cannot find the "redis" extension, and "predis/predis" is not installed: %s', $dsn));
         }
-        $class = null === $params['class'] ? (extension_loaded('redis') ? \Redis::class : \Predis\Client::class) : $params['class'];
+        $class = null === $params['class'] ? (\extension_loaded('redis') ? \Redis::class : \Predis\Client::class) : $params['class'];
 
         if (is_a($class, \Redis::class, true)) {
             $connect = $params['persistent'] || $params['persistent_id'] ? 'pconnect' : 'connect';
@@ -313,7 +313,7 @@ private function pipeline(\Closure $generator)
         if ($this->redis instanceof \Predis\Client && !$this->redis->getConnection() instanceof ClusterInterface) {
             $results = $this->redis->pipeline(function ($redis) use ($generator, &$ids) {
                 foreach ($generator() as $command => $args) {
-                    call_user_func_array(array($redis, $command), $args);
+                    \call_user_func_array(array($redis, $command), $args);
                     $ids[] = $args[0];
                 }
             });
@@ -324,7 +324,7 @@ private function pipeline(\Closure $generator)
                     $connections[$h] = array($this->redis->_instance($h), -1);
                     $connections[$h][0]->multi(\Redis::PIPELINE);
                 }
-                call_user_func_array(array($connections[$h][0], $command), $args);
+                \call_user_func_array(array($connections[$h][0], $command), $args);
                 $results[] = array($h, ++$connections[$h][1]);
                 $ids[] = $args[0];
             }
@@ -340,13 +340,13 @@ private function pipeline(\Closure $generator)
             // see https://github.com/nrk/predis/issues/267#issuecomment-123781423
             $results = array();
             foreach ($generator() as $command => $args) {
-                $results[] = call_user_func_array(array($this->redis, $command), $args);
+                $results[] = \call_user_func_array(array($this->redis, $command), $args);
                 $ids[] = $args[0];
             }
         } else {
             $this->redis->multi(\Redis::PIPELINE);
             foreach ($generator() as $command => $args) {
-                call_user_func_array(array($this->redis, $command), $args);
+                \call_user_func_array(array($this->redis, $command), $args);
                 $ids[] = $args[0];
             }
             $results = $this->redis->exec();
diff --git a/src/Symfony/Component/Config/ConfigCacheFactory.php b/src/Symfony/Component/Config/ConfigCacheFactory.php
index e43e1a190be1..1e71ea0fbfc8 100644
--- a/src/Symfony/Component/Config/ConfigCacheFactory.php
+++ b/src/Symfony/Component/Config/ConfigCacheFactory.php
@@ -37,13 +37,13 @@ public function __construct(bool $debug)
      */
     public function cache($file, $callback)
     {
-        if (!is_callable($callback)) {
-            throw new \InvalidArgumentException(sprintf('Invalid type for callback argument. Expected callable, but got "%s".', gettype($callback)));
+        if (!\is_callable($callback)) {
+            throw new \InvalidArgumentException(sprintf('Invalid type for callback argument. Expected callable, but got "%s".', \gettype($callback)));
         }
 
         $cache = new ConfigCache($file, $this->debug);
         if (!$cache->isFresh()) {
-            call_user_func($callback, $cache);
+            \call_user_func($callback, $cache);
         }
 
         return $cache;
diff --git a/src/Symfony/Component/Config/Definition/ArrayNode.php b/src/Symfony/Component/Config/Definition/ArrayNode.php
index 5f51a5da41d7..61e873634c2b 100644
--- a/src/Symfony/Component/Config/Definition/ArrayNode.php
+++ b/src/Symfony/Component/Config/Definition/ArrayNode.php
@@ -52,7 +52,7 @@ public function setNormalizeKeys($normalizeKeys)
      */
     protected function preNormalize($value)
     {
-        if (!$this->normalizeKeys || !is_array($value)) {
+        if (!$this->normalizeKeys || !\is_array($value)) {
             return $value;
         }
 
@@ -196,7 +196,7 @@ public function getDefaultValue()
     public function addChild(NodeInterface $node)
     {
         $name = $node->getName();
-        if (!strlen($name)) {
+        if (!\strlen($name)) {
             throw new \InvalidArgumentException('Child nodes must be named.');
         }
         if (isset($this->children[$name])) {
@@ -263,11 +263,11 @@ protected function finalizeValue($value)
      */
     protected function validateType($value)
     {
-        if (!is_array($value) && (!$this->allowFalse || false !== $value)) {
+        if (!\is_array($value) && (!$this->allowFalse || false !== $value)) {
             $ex = new InvalidTypeException(sprintf(
                 'Invalid type for path "%s". Expected array, but got %s',
                 $this->getPath(),
-                gettype($value)
+                \gettype($value)
             ));
             if ($hint = $this->getInfo()) {
                 $ex->addHint($hint);
@@ -306,8 +306,8 @@ protected function normalizeValue($value)
         }
 
         // if extra fields are present, throw exception
-        if (count($value) && !$this->ignoreExtraKeys) {
-            $msg = sprintf('Unrecognized option%s "%s" under "%s"', 1 === count($value) ? '' : 's', implode(', ', array_keys($value)), $this->getPath());
+        if (\count($value) && !$this->ignoreExtraKeys) {
+            $msg = sprintf('Unrecognized option%s "%s" under "%s"', 1 === \count($value) ? '' : 's', implode(', ', array_keys($value)), $this->getPath());
             $ex = new InvalidConfigurationException($msg);
             $ex->setPath($this->getPath());
 
diff --git a/src/Symfony/Component/Config/Definition/BooleanNode.php b/src/Symfony/Component/Config/Definition/BooleanNode.php
index 08e1a7730713..77e90cf7d624 100644
--- a/src/Symfony/Component/Config/Definition/BooleanNode.php
+++ b/src/Symfony/Component/Config/Definition/BooleanNode.php
@@ -25,11 +25,11 @@ class BooleanNode extends ScalarNode
      */
     protected function validateType($value)
     {
-        if (!is_bool($value)) {
+        if (!\is_bool($value)) {
             $ex = new InvalidTypeException(sprintf(
                 'Invalid type for path "%s". Expected boolean, but got %s.',
                 $this->getPath(),
-                gettype($value)
+                \gettype($value)
             ));
             if ($hint = $this->getInfo()) {
                 $ex->addHint($hint);
diff --git a/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php b/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
index d24baa955a87..2a9bb542b52d 100644
--- a/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
+++ b/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Config\Definition\Builder;
 
 use Symfony\Component\Config\Definition\ArrayNode;
-use Symfony\Component\Config\Definition\PrototypedArrayNode;
 use Symfony\Component\Config\Definition\Exception\InvalidDefinitionException;
+use Symfony\Component\Config\Definition\PrototypedArrayNode;
 
 /**
  * This class provides a fluent interface for defining an array node.
@@ -518,13 +518,13 @@ protected function validatePrototypeNode(PrototypedArrayNode $node)
                 );
             }
 
-            if (null !== $this->key && (null === $this->addDefaultChildren || is_int($this->addDefaultChildren) && $this->addDefaultChildren > 0)) {
+            if (null !== $this->key && (null === $this->addDefaultChildren || \is_int($this->addDefaultChildren) && $this->addDefaultChildren > 0)) {
                 throw new InvalidDefinitionException(
                     sprintf('->addDefaultChildrenIfNoneSet() should set default children names as ->useAttributeAsKey() is used at path "%s"', $path)
                 );
             }
 
-            if (null === $this->key && (is_string($this->addDefaultChildren) || is_array($this->addDefaultChildren))) {
+            if (null === $this->key && (\is_string($this->addDefaultChildren) || \is_array($this->addDefaultChildren))) {
                 throw new InvalidDefinitionException(
                     sprintf('->addDefaultChildrenIfNoneSet() might not set default children names as ->useAttributeAsKey() is not used at path "%s"', $path)
                 );
diff --git a/src/Symfony/Component/Config/Definition/Builder/ExprBuilder.php b/src/Symfony/Component/Config/Definition/Builder/ExprBuilder.php
index 64c0f5578ad4..5c070bee7c38 100644
--- a/src/Symfony/Component/Config/Definition/Builder/ExprBuilder.php
+++ b/src/Symfony/Component/Config/Definition/Builder/ExprBuilder.php
@@ -71,7 +71,7 @@ public function ifTrue(\Closure $closure = null)
      */
     public function ifString()
     {
-        $this->ifPart = function ($v) { return is_string($v); };
+        $this->ifPart = function ($v) { return \is_string($v); };
 
         return $this;
     }
@@ -107,7 +107,7 @@ public function ifEmpty()
      */
     public function ifArray()
     {
-        $this->ifPart = function ($v) { return is_array($v); };
+        $this->ifPart = function ($v) { return \is_array($v); };
 
         return $this;
     }
@@ -119,7 +119,7 @@ public function ifArray()
      */
     public function ifInArray(array $array)
     {
-        $this->ifPart = function ($v) use ($array) { return in_array($v, $array, true); };
+        $this->ifPart = function ($v) use ($array) { return \in_array($v, $array, true); };
 
         return $this;
     }
@@ -131,7 +131,7 @@ public function ifInArray(array $array)
      */
     public function ifNotInArray(array $array)
     {
-        $this->ifPart = function ($v) use ($array) { return !in_array($v, $array, true); };
+        $this->ifPart = function ($v) use ($array) { return !\in_array($v, $array, true); };
 
         return $this;
     }
@@ -143,7 +143,7 @@ public function ifNotInArray(array $array)
      */
     public function castToArray()
     {
-        $this->ifPart = function ($v) { return !is_array($v); };
+        $this->ifPart = function ($v) { return !\is_array($v); };
         $this->thenPart = function ($v) { return array($v); };
 
         return $this;
diff --git a/src/Symfony/Component/Config/Definition/Builder/NodeDefinition.php b/src/Symfony/Component/Config/Definition/Builder/NodeDefinition.php
index 6284edfc787a..cef35dbd7d29 100644
--- a/src/Symfony/Component/Config/Definition/Builder/NodeDefinition.php
+++ b/src/Symfony/Component/Config/Definition/Builder/NodeDefinition.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Config\Definition\Builder;
 
-use Symfony\Component\Config\Definition\NodeInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidDefinitionException;
+use Symfony\Component\Config\Definition\NodeInterface;
 
 /**
  * This class provides a fluent interface for defining a node.
diff --git a/src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php b/src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php
index b87acc93d4c7..bea15e3ab997 100644
--- a/src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php
+++ b/src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Config\Definition\Dumper;
 
-use Symfony\Component\Config\Definition\ConfigurationInterface;
-use Symfony\Component\Config\Definition\NodeInterface;
 use Symfony\Component\Config\Definition\ArrayNode;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\Definition\EnumNode;
+use Symfony\Component\Config\Definition\NodeInterface;
 use Symfony\Component\Config\Definition\PrototypedArrayNode;
 
 /**
@@ -52,7 +52,7 @@ private function writeNode(NodeInterface $node, int $depth = 0, bool $root = fal
                 return $rootName === $mapping[1];
             });
 
-            if (count($remapping)) {
+            if (\count($remapping)) {
                 list($singular) = current($remapping);
                 $rootName = $singular;
             }
@@ -99,7 +99,7 @@ private function writeNode(NodeInterface $node, int $depth = 0, bool $root = fal
                     if ($prototype->hasDefaultValue()) {
                         $prototypeValue = $prototype->getDefaultValue();
                     } else {
-                        switch (get_class($prototype)) {
+                        switch (\get_class($prototype)) {
                             case 'Symfony\Component\Config\Definition\ScalarNode':
                                 $prototypeValue = 'scalar value';
                                 break;
@@ -155,7 +155,7 @@ private function writeNode(NodeInterface $node, int $depth = 0, bool $root = fal
                         $comments[] = 'One of '.implode('; ', array_map('json_encode', $child->getValues()));
                     }
 
-                    if (count($comments)) {
+                    if (\count($comments)) {
                         $rootAttributeComments[$name] = implode(";\n", $comments);
                     }
 
@@ -176,18 +176,18 @@ private function writeNode(NodeInterface $node, int $depth = 0, bool $root = fal
         // render comments
 
         // root node comment
-        if (count($rootComments)) {
+        if (\count($rootComments)) {
             foreach ($rootComments as $comment) {
                 $this->writeLine('<!-- '.$comment.' -->', $depth);
             }
         }
 
         // attribute comments
-        if (count($rootAttributeComments)) {
+        if (\count($rootAttributeComments)) {
             foreach ($rootAttributeComments as $attrName => $comment) {
-                $commentDepth = $depth + 4 + strlen($attrName) + 2;
+                $commentDepth = $depth + 4 + \strlen($attrName) + 2;
                 $commentLines = explode("\n", $comment);
-                $multiline = (count($commentLines) > 1);
+                $multiline = (\count($commentLines) > 1);
                 $comment = implode(PHP_EOL.str_repeat(' ', $commentDepth), $commentLines);
 
                 if ($multiline) {
@@ -202,9 +202,9 @@ private function writeNode(NodeInterface $node, int $depth = 0, bool $root = fal
 
         // render start tag + attributes
         $rootIsVariablePrototype = isset($prototypeValue);
-        $rootIsEmptyTag = (0 === count($rootChildren) && !$rootIsVariablePrototype);
+        $rootIsEmptyTag = (0 === \count($rootChildren) && !$rootIsVariablePrototype);
         $rootOpenTag = '<'.$rootName;
-        if (1 >= ($attributesCount = count($rootAttributes))) {
+        if (1 >= ($attributesCount = \count($rootAttributes))) {
             if (1 === $attributesCount) {
                 $rootOpenTag .= sprintf(' %s="%s"', current(array_keys($rootAttributes)), $this->writeValue(current($rootAttributes)));
             }
@@ -256,7 +256,7 @@ private function writeNode(NodeInterface $node, int $depth = 0, bool $root = fal
      */
     private function writeLine(string $text, int $indent = 0)
     {
-        $indent = strlen($text) + $indent;
+        $indent = \strlen($text) + $indent;
         $format = '%'.$indent.'s';
 
         $this->reference .= sprintf($format, $text).PHP_EOL;
@@ -273,7 +273,7 @@ private function writeValue($value): string
             return '';
         }
 
-        if (is_string($value) || is_numeric($value)) {
+        if (\is_string($value) || is_numeric($value)) {
             return $value;
         }
 
@@ -293,7 +293,7 @@ private function writeValue($value): string
             return '';
         }
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             return implode(',', $value);
         }
     }
diff --git a/src/Symfony/Component/Config/Definition/Dumper/YamlReferenceDumper.php b/src/Symfony/Component/Config/Definition/Dumper/YamlReferenceDumper.php
index 960d13623107..b75a63d16683 100644
--- a/src/Symfony/Component/Config/Definition/Dumper/YamlReferenceDumper.php
+++ b/src/Symfony/Component/Config/Definition/Dumper/YamlReferenceDumper.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Config\Definition\Dumper;
 
-use Symfony\Component\Config\Definition\ConfigurationInterface;
-use Symfony\Component\Config\Definition\NodeInterface;
 use Symfony\Component\Config\Definition\ArrayNode;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\Definition\EnumNode;
+use Symfony\Component\Config\Definition\NodeInterface;
 use Symfony\Component\Config\Definition\PrototypedArrayNode;
 use Symfony\Component\Config\Definition\ScalarNode;
 use Symfony\Component\Yaml\Inline;
@@ -86,9 +86,9 @@ private function writeNode(NodeInterface $node, NodeInterface $parentNode = null
             }
 
             if (!$children) {
-                if ($node->hasDefaultValue() && count($defaultArray = $node->getDefaultValue())) {
+                if ($node->hasDefaultValue() && \count($defaultArray = $node->getDefaultValue())) {
                     $default = '';
-                } elseif (!is_array($example)) {
+                } elseif (!\is_array($example)) {
                     $default = '[]';
                 }
             }
@@ -101,10 +101,10 @@ private function writeNode(NodeInterface $node, NodeInterface $parentNode = null
             if ($node->hasDefaultValue()) {
                 $default = $node->getDefaultValue();
 
-                if (is_array($default)) {
-                    if (count($defaultArray = $node->getDefaultValue())) {
+                if (\is_array($default)) {
+                    if (\count($defaultArray = $node->getDefaultValue())) {
                         $default = '';
-                    } elseif (!is_array($example)) {
+                    } elseif (!\is_array($example)) {
                         $default = '[]';
                     }
                 } else {
@@ -124,12 +124,12 @@ private function writeNode(NodeInterface $node, NodeInterface $parentNode = null
         }
 
         // example
-        if ($example && !is_array($example)) {
+        if ($example && !\is_array($example)) {
             $comments[] = 'Example: '.$example;
         }
 
         $default = '' != (string) $default ? ' '.$default : '';
-        $comments = count($comments) ? '# '.implode(', ', $comments) : '';
+        $comments = \count($comments) ? '# '.implode(', ', $comments) : '';
 
         $key = $prototypedArray ? '-' : $node->getName().':';
         $text = rtrim(sprintf('%-21s%s %s', $key, $default, $comments), ' ');
@@ -147,17 +147,17 @@ private function writeNode(NodeInterface $node, NodeInterface $parentNode = null
         if ($defaultArray) {
             $this->writeLine('');
 
-            $message = count($defaultArray) > 1 ? 'Defaults' : 'Default';
+            $message = \count($defaultArray) > 1 ? 'Defaults' : 'Default';
 
             $this->writeLine('# '.$message.':', $depth * 4 + 4);
 
             $this->writeArray($defaultArray, $depth + 1);
         }
 
-        if (is_array($example)) {
+        if (\is_array($example)) {
             $this->writeLine('');
 
-            $message = count($example) > 1 ? 'Examples' : 'Example';
+            $message = \count($example) > 1 ? 'Examples' : 'Example';
 
             $this->writeLine('# '.$message.':', $depth * 4 + 4);
 
@@ -176,7 +176,7 @@ private function writeNode(NodeInterface $node, NodeInterface $parentNode = null
      */
     private function writeLine(string $text, int $indent = 0)
     {
-        $indent = strlen($text) + $indent;
+        $indent = \strlen($text) + $indent;
         $format = '%'.$indent.'s';
 
         $this->reference .= sprintf($format, $text)."\n";
@@ -187,7 +187,7 @@ private function writeArray(array $array, $depth)
         $isIndexed = array_values($array) === $array;
 
         foreach ($array as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $val = '';
             } else {
                 $val = $value;
@@ -199,7 +199,7 @@ private function writeArray(array $array, $depth)
                 $this->writeLine(sprintf('%-20s %s', $key.':', $val), $depth * 4);
             }
 
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $this->writeArray($value, $depth + 1);
             }
         }
diff --git a/src/Symfony/Component/Config/Definition/EnumNode.php b/src/Symfony/Component/Config/Definition/EnumNode.php
index 7fc8bf1699f8..ffe5ca3a9f8c 100644
--- a/src/Symfony/Component/Config/Definition/EnumNode.php
+++ b/src/Symfony/Component/Config/Definition/EnumNode.php
@@ -42,7 +42,7 @@ protected function finalizeValue($value)
     {
         $value = parent::finalizeValue($value);
 
-        if (!in_array($value, $this->values, true)) {
+        if (!\in_array($value, $this->values, true)) {
             $ex = new InvalidConfigurationException(sprintf(
                 'The value %s is not allowed for path "%s". Permissible values: %s',
                 json_encode($value),
diff --git a/src/Symfony/Component/Config/Definition/FloatNode.php b/src/Symfony/Component/Config/Definition/FloatNode.php
index 5e1af17ada07..9eb8789950ec 100644
--- a/src/Symfony/Component/Config/Definition/FloatNode.php
+++ b/src/Symfony/Component/Config/Definition/FloatNode.php
@@ -26,12 +26,12 @@ class FloatNode extends NumericNode
     protected function validateType($value)
     {
         // Integers are also accepted, we just cast them
-        if (is_int($value)) {
+        if (\is_int($value)) {
             $value = (float) $value;
         }
 
-        if (!is_float($value)) {
-            $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected float, but got %s.', $this->getPath(), gettype($value)));
+        if (!\is_float($value)) {
+            $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected float, but got %s.', $this->getPath(), \gettype($value)));
             if ($hint = $this->getInfo()) {
                 $ex->addHint($hint);
             }
diff --git a/src/Symfony/Component/Config/Definition/IntegerNode.php b/src/Symfony/Component/Config/Definition/IntegerNode.php
index ba2307024cae..8ec068a84ecf 100644
--- a/src/Symfony/Component/Config/Definition/IntegerNode.php
+++ b/src/Symfony/Component/Config/Definition/IntegerNode.php
@@ -25,8 +25,8 @@ class IntegerNode extends NumericNode
      */
     protected function validateType($value)
     {
-        if (!is_int($value)) {
-            $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected int, but got %s.', $this->getPath(), gettype($value)));
+        if (!\is_int($value)) {
+            $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected int, but got %s.', $this->getPath(), \gettype($value)));
             if ($hint = $this->getInfo()) {
                 $ex->addHint($hint);
             }
diff --git a/src/Symfony/Component/Config/Definition/Processor.php b/src/Symfony/Component/Config/Definition/Processor.php
index 025e69378f94..3e0feab8693e 100644
--- a/src/Symfony/Component/Config/Definition/Processor.php
+++ b/src/Symfony/Component/Config/Definition/Processor.php
@@ -84,7 +84,7 @@ public static function normalizeConfig($config, $key, $plural = null)
         }
 
         if (isset($config[$key])) {
-            if (is_string($config[$key]) || !is_int(key($config[$key]))) {
+            if (\is_string($config[$key]) || !\is_int(key($config[$key]))) {
                 // only one
                 return  array($config[$key]);
             }
diff --git a/src/Symfony/Component/Config/Definition/PrototypedArrayNode.php b/src/Symfony/Component/Config/Definition/PrototypedArrayNode.php
index d183a6052504..fd686a1e5ef3 100644
--- a/src/Symfony/Component/Config/Definition/PrototypedArrayNode.php
+++ b/src/Symfony/Component/Config/Definition/PrototypedArrayNode.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Config\Definition;
 
-use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\Config\Definition\Exception\DuplicateKeyException;
-use Symfony\Component\Config\Definition\Exception\UnsetKeyException;
 use Symfony\Component\Config\Definition\Exception\Exception;
+use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
+use Symfony\Component\Config\Definition\Exception\UnsetKeyException;
 
 /**
  * Represents a prototyped Array node in the config tree.
@@ -94,7 +94,7 @@ public function getKeyAttribute()
      */
     public function setDefaultValue($value)
     {
-        if (!is_array($value)) {
+        if (!\is_array($value)) {
             throw new \InvalidArgumentException($this->getPath().': the default value of an array node has to be an array.');
         }
 
@@ -119,7 +119,7 @@ public function setAddChildrenIfNoneSet($children = array('defaults'))
         if (null === $children) {
             $this->defaultChildren = array('defaults');
         } else {
-            $this->defaultChildren = is_int($children) && $children > 0 ? range(1, $children) : (array) $children;
+            $this->defaultChildren = \is_int($children) && $children > 0 ? range(1, $children) : (array) $children;
         }
     }
 
@@ -198,7 +198,7 @@ protected function finalizeValue($value)
             }
         }
 
-        if (count($value) < $this->minNumberOfElements) {
+        if (\count($value) < $this->minNumberOfElements) {
             $msg = sprintf('The path "%s" should have at least %d element(s) defined.', $this->getPath(), $this->minNumberOfElements);
             $ex = new InvalidConfigurationException($msg);
             $ex->setPath($this->getPath());
@@ -227,11 +227,11 @@ protected function normalizeValue($value)
 
         $value = $this->remapXml($value);
 
-        $isAssoc = array_keys($value) !== range(0, count($value) - 1);
+        $isAssoc = array_keys($value) !== range(0, \count($value) - 1);
         $normalized = array();
         foreach ($value as $k => $v) {
-            if (null !== $this->keyAttribute && is_array($v)) {
-                if (!isset($v[$this->keyAttribute]) && is_int($k) && !$isAssoc) {
+            if (null !== $this->keyAttribute && \is_array($v)) {
+                if (!isset($v[$this->keyAttribute]) && \is_int($k) && !$isAssoc) {
                     $msg = sprintf('The attribute "%s" must be set for path "%s".', $this->keyAttribute, $this->getPath());
                     $ex = new InvalidConfigurationException($msg);
                     $ex->setPath($this->getPath());
@@ -252,9 +252,9 @@ protected function normalizeValue($value)
                             $valuePrototype = current($this->valuePrototypes) ?: clone $children['value'];
                             $valuePrototype->parent = $this;
                             $originalClosures = $this->prototype->normalizationClosures;
-                            if (is_array($originalClosures)) {
+                            if (\is_array($originalClosures)) {
                                 $valuePrototypeClosures = $valuePrototype->normalizationClosures;
-                                $valuePrototype->normalizationClosures = is_array($valuePrototypeClosures) ? array_merge($originalClosures, $valuePrototypeClosures) : $originalClosures;
+                                $valuePrototype->normalizationClosures = \is_array($valuePrototypeClosures) ? array_merge($originalClosures, $valuePrototypeClosures) : $originalClosures;
                             }
                             $this->valuePrototypes[$k] = $valuePrototype;
                         }
diff --git a/src/Symfony/Component/Config/Definition/ScalarNode.php b/src/Symfony/Component/Config/Definition/ScalarNode.php
index 6b3fd0b68fd2..e63f3f227f70 100644
--- a/src/Symfony/Component/Config/Definition/ScalarNode.php
+++ b/src/Symfony/Component/Config/Definition/ScalarNode.php
@@ -36,7 +36,7 @@ protected function validateType($value)
             $ex = new InvalidTypeException(sprintf(
                 'Invalid type for path "%s". Expected scalar, but got %s.',
                 $this->getPath(),
-                gettype($value)
+                \gettype($value)
             ));
             if ($hint = $this->getInfo()) {
                 $ex->addHint($hint);
diff --git a/src/Symfony/Component/Config/Exception/FileLoaderLoadException.php b/src/Symfony/Component/Config/Exception/FileLoaderLoadException.php
index 62e56622f3d4..176a55292b44 100644
--- a/src/Symfony/Component/Config/Exception/FileLoaderLoadException.php
+++ b/src/Symfony/Component/Config/Exception/FileLoaderLoadException.php
@@ -57,7 +57,7 @@ public function __construct(string $resource, string $sourceResource = null, int
 
         // Is the resource located inside a bundle?
         if ('@' === $resource[0]) {
-            $parts = explode(DIRECTORY_SEPARATOR, $resource);
+            $parts = explode(\DIRECTORY_SEPARATOR, $resource);
             $bundle = substr($parts[0], 1);
             $message .= sprintf(' Make sure the "%s" bundle is correctly registered and loaded in the application kernel class.', $bundle);
             $message .= sprintf(' If the bundle is registered, make sure the bundle path "%s" is not empty.', $resource);
@@ -75,11 +75,11 @@ public function __construct(string $resource, string $sourceResource = null, int
 
     protected function varToString($var)
     {
-        if (is_object($var)) {
-            return sprintf('Object(%s)', get_class($var));
+        if (\is_object($var)) {
+            return sprintf('Object(%s)', \get_class($var));
         }
 
-        if (is_array($var)) {
+        if (\is_array($var)) {
             $a = array();
             foreach ($var as $k => $v) {
                 $a[] = sprintf('%s => %s', $k, $this->varToString($v));
@@ -88,7 +88,7 @@ protected function varToString($var)
             return sprintf('Array(%s)', implode(', ', $a));
         }
 
-        if (is_resource($var)) {
+        if (\is_resource($var)) {
             return sprintf('Resource(%s)', get_resource_type($var));
         }
 
diff --git a/src/Symfony/Component/Config/FileLocator.php b/src/Symfony/Component/Config/FileLocator.php
index a3e8fd110437..2b61db6d768a 100644
--- a/src/Symfony/Component/Config/FileLocator.php
+++ b/src/Symfony/Component/Config/FileLocator.php
@@ -57,7 +57,7 @@ public function locate($name, $currentPath = null, $first = true)
         $filepaths = $notfound = array();
 
         foreach ($paths as $path) {
-            if (@file_exists($file = $path.DIRECTORY_SEPARATOR.$name)) {
+            if (@file_exists($file = $path.\DIRECTORY_SEPARATOR.$name)) {
                 if (true === $first) {
                     return $file;
                 }
@@ -84,7 +84,7 @@ public function locate($name, $currentPath = null, $first = true)
     private function isAbsolutePath($file)
     {
         if ('/' === $file[0] || '\\' === $file[0]
-            || (strlen($file) > 3 && ctype_alpha($file[0])
+            || (\strlen($file) > 3 && ctype_alpha($file[0])
                 && ':' === $file[1]
                 && ('\\' === $file[2] || '/' === $file[2])
             )
diff --git a/src/Symfony/Component/Config/Loader/FileLoader.php b/src/Symfony/Component/Config/Loader/FileLoader.php
index c06171992aad..ab72e83a1ef7 100644
--- a/src/Symfony/Component/Config/Loader/FileLoader.php
+++ b/src/Symfony/Component/Config/Loader/FileLoader.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Config\Loader;
 
-use Symfony\Component\Config\FileLocatorInterface;
-use Symfony\Component\Config\Exception\FileLoaderLoadException;
 use Symfony\Component\Config\Exception\FileLoaderImportCircularReferenceException;
+use Symfony\Component\Config\Exception\FileLoaderLoadException;
 use Symfony\Component\Config\Exception\FileLocatorFileNotFoundException;
+use Symfony\Component\Config\FileLocatorInterface;
 use Symfony\Component\Config\Resource\FileExistenceResource;
 use Symfony\Component\Config\Resource\GlobResource;
 
@@ -72,7 +72,7 @@ public function getLocator()
      */
     public function import($resource, $type = null, $ignoreErrors = false, $sourceResource = null)
     {
-        if (is_string($resource) && strlen($resource) !== $i = strcspn($resource, '*?{[')) {
+        if (\is_string($resource) && \strlen($resource) !== $i = strcspn($resource, '*?{[')) {
             $ret = array();
             $isSubpath = 0 !== $i && false !== strpos(substr($resource, 0, $i), '/');
             foreach ($this->glob($resource, false, $_, $ignoreErrors || !$isSubpath) as $path => $info) {
@@ -95,15 +95,15 @@ public function import($resource, $type = null, $ignoreErrors = false, $sourceRe
      */
     protected function glob(string $pattern, bool $recursive, &$resource = null, bool $ignoreErrors = false)
     {
-        if (strlen($pattern) === $i = strcspn($pattern, '*?{[')) {
+        if (\strlen($pattern) === $i = strcspn($pattern, '*?{[')) {
             $prefix = $pattern;
             $pattern = '';
         } elseif (0 === $i || false === strpos(substr($pattern, 0, $i), '/')) {
             $prefix = '.';
             $pattern = '/'.$pattern;
         } else {
-            $prefix = dirname(substr($pattern, 0, 1 + $i));
-            $pattern = substr($pattern, strlen($prefix));
+            $prefix = \dirname(substr($pattern, 0, 1 + $i));
+            $pattern = substr($pattern, \strlen($prefix));
         }
 
         try {
@@ -136,8 +136,8 @@ private function doImport($resource, $type = null, bool $ignoreErrors = false, $
                 $resource = $loader->getLocator()->locate($resource, $this->currentDir, false);
             }
 
-            $resources = is_array($resource) ? $resource : array($resource);
-            for ($i = 0; $i < $resourcesCount = count($resources); ++$i) {
+            $resources = \is_array($resource) ? $resource : array($resource);
+            for ($i = 0; $i < $resourcesCount = \count($resources); ++$i) {
                 if (isset(self::$loading[$resources[$i]])) {
                     if ($i == $resourcesCount - 1) {
                         throw new FileLoaderImportCircularReferenceException(array_keys(self::$loading));
diff --git a/src/Symfony/Component/Config/Resource/ClassExistenceResource.php b/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
index a4dd74b1f9db..800e14c7ff54 100644
--- a/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
+++ b/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
@@ -152,7 +152,7 @@ private static function throwOnRequiredClass($class)
             $props = array(
                 'file' => $trace[$i]['file'],
                 'line' => $trace[$i]['line'],
-                'trace' => array_slice($trace, 1 + $i),
+                'trace' => \array_slice($trace, 1 + $i),
             );
 
             foreach ($props as $p => $v) {
diff --git a/src/Symfony/Component/Config/Resource/ComposerResource.php b/src/Symfony/Component/Config/Resource/ComposerResource.php
index 64288ea1db2d..9c170c077509 100644
--- a/src/Symfony/Component/Config/Resource/ComposerResource.php
+++ b/src/Symfony/Component/Config/Resource/ComposerResource.php
@@ -68,7 +68,7 @@ private static function refresh()
         foreach (get_declared_classes() as $class) {
             if ('C' === $class[0] && 0 === strpos($class, 'ComposerAutoloaderInit')) {
                 $r = new \ReflectionClass($class);
-                $v = dirname(dirname($r->getFileName()));
+                $v = \dirname(\dirname($r->getFileName()));
                 if (file_exists($v.'/composer/installed.json')) {
                     self::$runtimeVendors[$v] = @filemtime($v.'/composer/installed.json');
                 }
diff --git a/src/Symfony/Component/Config/Resource/GlobResource.php b/src/Symfony/Component/Config/Resource/GlobResource.php
index fb5fc4f6935b..a04cbf7be8ff 100644
--- a/src/Symfony/Component/Config/Resource/GlobResource.php
+++ b/src/Symfony/Component/Config/Resource/GlobResource.php
@@ -93,8 +93,8 @@ public function getIterator()
             return;
         }
 
-        if (0 !== strpos($this->prefix, 'phar://') && false === strpos($this->pattern, '/**/') && (defined('GLOB_BRACE') || false === strpos($this->pattern, '{'))) {
-            foreach (glob($this->prefix.$this->pattern, defined('GLOB_BRACE') ? GLOB_BRACE : 0) as $path) {
+        if (0 !== strpos($this->prefix, 'phar://') && false === strpos($this->pattern, '/**/') && (\defined('GLOB_BRACE') || false === strpos($this->pattern, '{'))) {
+            foreach (glob($this->prefix.$this->pattern, \defined('GLOB_BRACE') ? GLOB_BRACE : 0) as $path) {
                 if ($this->recursive && is_dir($path)) {
                     $files = iterator_to_array(new \RecursiveIteratorIterator(
                         new \RecursiveCallbackFilterIterator(
@@ -130,7 +130,7 @@ function (\SplFileInfo $file) { return '.' !== $file->getBasename()[0]; }
             $regex = substr_replace($regex, '(/|$)', -2, 1);
         }
 
-        $prefixLen = strlen($this->prefix);
+        $prefixLen = \strlen($this->prefix);
         foreach ($finder->followLinks()->sortByName()->in($this->prefix) as $path => $info) {
             if (preg_match($regex, substr('\\' === \DIRECTORY_SEPARATOR ? str_replace('\\', '/', $path) : $path, $prefixLen)) && $info->isFile()) {
                 yield $path => $info;
diff --git a/src/Symfony/Component/Config/Resource/ReflectionClassResource.php b/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
index bf8e5625acaf..3ca08166d560 100644
--- a/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
+++ b/src/Symfony/Component/Config/Resource/ReflectionClassResource.php
@@ -81,7 +81,7 @@ private function loadFiles(\ReflectionClass $class)
             $file = $class->getFileName();
             if (false !== $file && file_exists($file)) {
                 foreach ($this->excludedVendors as $vendor) {
-                    if (0 === strpos($file, $vendor) && false !== strpbrk(substr($file, strlen($vendor), 1), '/'.DIRECTORY_SEPARATOR)) {
+                    if (0 === strpos($file, $vendor) && false !== strpbrk(substr($file, \strlen($vendor), 1), '/'.\DIRECTORY_SEPARATOR)) {
                         $file = false;
                         break;
                     }
diff --git a/src/Symfony/Component/Config/ResourceCheckerConfigCache.php b/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
index 6f64c4abcd66..0b278fe9ded0 100644
--- a/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
+++ b/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
@@ -72,7 +72,7 @@ public function isFresh()
             $this->resourceCheckers = iterator_to_array($this->resourceCheckers);
         }
 
-        if (!count($this->resourceCheckers)) {
+        if (!\count($this->resourceCheckers)) {
             return true; // shortcut - if we don't have any checkers we don't need to bother with the meta file at all
         }
 
diff --git a/src/Symfony/Component/Config/ResourceCheckerConfigCacheFactory.php b/src/Symfony/Component/Config/ResourceCheckerConfigCacheFactory.php
index 845eabdee876..4f45a9153a55 100644
--- a/src/Symfony/Component/Config/ResourceCheckerConfigCacheFactory.php
+++ b/src/Symfony/Component/Config/ResourceCheckerConfigCacheFactory.php
@@ -34,13 +34,13 @@ public function __construct(iterable $resourceCheckers = array())
      */
     public function cache($file, $callback)
     {
-        if (!is_callable($callback)) {
-            throw new \InvalidArgumentException(sprintf('Invalid type for callback argument. Expected callable, but got "%s".', gettype($callback)));
+        if (!\is_callable($callback)) {
+            throw new \InvalidArgumentException(sprintf('Invalid type for callback argument. Expected callable, but got "%s".', \gettype($callback)));
         }
 
         $cache = new ResourceCheckerConfigCache($file, $this->resourceCheckers);
         if (!$cache->isFresh()) {
-            call_user_func($callback, $cache);
+            \call_user_func($callback, $cache);
         }
 
         return $cache;
diff --git a/src/Symfony/Component/Config/Tests/Definition/ArrayNodeTest.php b/src/Symfony/Component/Config/Tests/Definition/ArrayNodeTest.php
index 58d2939300f7..089cb56638d3 100644
--- a/src/Symfony/Component/Config/Tests/Definition/ArrayNodeTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/ArrayNodeTest.php
@@ -56,10 +56,10 @@ public function testIgnoreAndRemoveBehaviors($ignore, $remove, $expected, $messa
     {
         if ($expected instanceof \Exception) {
             if (method_exists($this, 'expectException')) {
-                $this->expectException(get_class($expected));
+                $this->expectException(\get_class($expected));
                 $this->expectExceptionMessage($expected->getMessage());
             } else {
-                $this->setExpectedException(get_class($expected), $expected->getMessage());
+                $this->setExpectedException(\get_class($expected), $expected->getMessage());
             }
         }
         $node = new ArrayNode('root');
diff --git a/src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php b/src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php
index 2bd55575d054..13ad8bc09e9a 100644
--- a/src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
-use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\Config\Definition\Builder\ScalarNodeDefinition;
 use Symfony\Component\Config\Definition\Exception\InvalidDefinitionException;
+use Symfony\Component\Config\Definition\Processor;
 
 class ArrayNodeDefinitionTest extends TestCase
 {
@@ -43,7 +43,7 @@ public function testPrototypeNodeSpecificOption($method, $args)
     {
         $node = new ArrayNodeDefinition('root');
 
-        call_user_func_array(array($node, $method), $args);
+        \call_user_func_array(array($node, $method), $args);
 
         $node->getNode();
     }
diff --git a/src/Symfony/Component/Config/Tests/Definition/Builder/NodeBuilderTest.php b/src/Symfony/Component/Config/Tests/Definition/Builder/NodeBuilderTest.php
index 88775656784f..cd77dd702bce 100644
--- a/src/Symfony/Component/Config/Tests/Definition/Builder/NodeBuilderTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/Builder/NodeBuilderTest.php
@@ -68,14 +68,14 @@ public function testNodeTypesAreNotCaseSensitive()
         $node1 = $builder->node('', 'VaRiAbLe');
         $node2 = $builder->node('', 'variable');
 
-        $this->assertInstanceOf(get_class($node1), $node2);
+        $this->assertInstanceOf(\get_class($node1), $node2);
 
         $builder->setNodeClass('CuStOm', __NAMESPACE__.'\\SomeNodeDefinition');
 
         $node1 = $builder->node('', 'CUSTOM');
         $node2 = $builder->node('', 'custom');
 
-        $this->assertInstanceOf(get_class($node1), $node2);
+        $this->assertInstanceOf(\get_class($node1), $node2);
     }
 
     public function testNumericNodeCreation()
diff --git a/src/Symfony/Component/Config/Tests/Definition/Builder/NumericNodeDefinitionTest.php b/src/Symfony/Component/Config/Tests/Definition/Builder/NumericNodeDefinitionTest.php
index 5a86e1ef6108..31342503d8d0 100644
--- a/src/Symfony/Component/Config/Tests/Definition/Builder/NumericNodeDefinitionTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/Builder/NumericNodeDefinitionTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Config\Tests\Definition\Builder;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Config\Definition\Builder\IntegerNodeDefinition as NumericNodeDefinition;
-use Symfony\Component\Config\Definition\Builder\IntegerNodeDefinition;
 use Symfony\Component\Config\Definition\Builder\FloatNodeDefinition;
+use Symfony\Component\Config\Definition\Builder\IntegerNodeDefinition;
+use Symfony\Component\Config\Definition\Builder\IntegerNodeDefinition as NumericNodeDefinition;
 
 class NumericNodeDefinitionTest extends TestCase
 {
diff --git a/src/Symfony/Component/Config/Tests/Definition/Builder/TreeBuilderTest.php b/src/Symfony/Component/Config/Tests/Definition/Builder/TreeBuilderTest.php
index 0a9312346e98..c425f0ed3d6d 100644
--- a/src/Symfony/Component/Config/Tests/Definition/Builder/TreeBuilderTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/Builder/TreeBuilderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Config\Tests\Definition\Builder;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Config\Tests\Fixtures\Builder\NodeBuilder as CustomNodeBuilder;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Tests\Fixtures\Builder\NodeBuilder as CustomNodeBuilder;
 
 class TreeBuilderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Config/Tests/Definition/FinalizationTest.php b/src/Symfony/Component/Config/Tests/Definition/FinalizationTest.php
index 733f600850f5..d19fbd69ae88 100644
--- a/src/Symfony/Component/Config/Tests/Definition/FinalizationTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/FinalizationTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
-use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\Config\Definition\NodeInterface;
+use Symfony\Component\Config\Definition\Processor;
 
 class FinalizationTest extends TestCase
 {
diff --git a/src/Symfony/Component/Config/Tests/Definition/NormalizationTest.php b/src/Symfony/Component/Config/Tests/Definition/NormalizationTest.php
index f011f5422ffe..3273c78668f1 100644
--- a/src/Symfony/Component/Config/Tests/Definition/NormalizationTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/NormalizationTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Config\Tests\Definition;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Config\Definition\NodeInterface;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\NodeInterface;
 
 class NormalizationTest extends TestCase
 {
diff --git a/src/Symfony/Component/Config/Tests/Definition/PrototypedArrayNodeTest.php b/src/Symfony/Component/Config/Tests/Definition/PrototypedArrayNodeTest.php
index 1a5de41ccb01..731d7af25fa7 100644
--- a/src/Symfony/Component/Config/Tests/Definition/PrototypedArrayNodeTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/PrototypedArrayNodeTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Config\Tests\Definition;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Config\Definition\PrototypedArrayNode;
 use Symfony\Component\Config\Definition\ArrayNode;
+use Symfony\Component\Config\Definition\PrototypedArrayNode;
 use Symfony\Component\Config\Definition\ScalarNode;
 use Symfony\Component\Config\Definition\VariableNode;
 
diff --git a/src/Symfony/Component/Config/Tests/FileLocatorTest.php b/src/Symfony/Component/Config/Tests/FileLocatorTest.php
index 049c00905b60..712050413152 100644
--- a/src/Symfony/Component/Config/Tests/FileLocatorTest.php
+++ b/src/Symfony/Component/Config/Tests/FileLocatorTest.php
@@ -46,33 +46,33 @@ public function testLocate()
         $loader = new FileLocator(__DIR__.'/Fixtures');
 
         $this->assertEquals(
-            __DIR__.DIRECTORY_SEPARATOR.'FileLocatorTest.php',
+            __DIR__.\DIRECTORY_SEPARATOR.'FileLocatorTest.php',
             $loader->locate('FileLocatorTest.php', __DIR__),
             '->locate() returns the absolute filename if the file exists in the given path'
         );
 
         $this->assertEquals(
-            __DIR__.'/Fixtures'.DIRECTORY_SEPARATOR.'foo.xml',
+            __DIR__.'/Fixtures'.\DIRECTORY_SEPARATOR.'foo.xml',
             $loader->locate('foo.xml', __DIR__),
             '->locate() returns the absolute filename if the file exists in one of the paths given in the constructor'
         );
 
         $this->assertEquals(
-            __DIR__.'/Fixtures'.DIRECTORY_SEPARATOR.'foo.xml',
-            $loader->locate(__DIR__.'/Fixtures'.DIRECTORY_SEPARATOR.'foo.xml', __DIR__),
+            __DIR__.'/Fixtures'.\DIRECTORY_SEPARATOR.'foo.xml',
+            $loader->locate(__DIR__.'/Fixtures'.\DIRECTORY_SEPARATOR.'foo.xml', __DIR__),
             '->locate() returns the absolute filename if the file exists in one of the paths given in the constructor'
         );
 
         $loader = new FileLocator(array(__DIR__.'/Fixtures', __DIR__.'/Fixtures/Again'));
 
         $this->assertEquals(
-            array(__DIR__.'/Fixtures'.DIRECTORY_SEPARATOR.'foo.xml', __DIR__.'/Fixtures/Again'.DIRECTORY_SEPARATOR.'foo.xml'),
+            array(__DIR__.'/Fixtures'.\DIRECTORY_SEPARATOR.'foo.xml', __DIR__.'/Fixtures/Again'.\DIRECTORY_SEPARATOR.'foo.xml'),
             $loader->locate('foo.xml', __DIR__, false),
             '->locate() returns an array of absolute filenames'
         );
 
         $this->assertEquals(
-            array(__DIR__.'/Fixtures'.DIRECTORY_SEPARATOR.'foo.xml', __DIR__.'/Fixtures/Again'.DIRECTORY_SEPARATOR.'foo.xml'),
+            array(__DIR__.'/Fixtures'.\DIRECTORY_SEPARATOR.'foo.xml', __DIR__.'/Fixtures/Again'.\DIRECTORY_SEPARATOR.'foo.xml'),
             $loader->locate('foo.xml', __DIR__.'/Fixtures', false),
             '->locate() returns an array of absolute filenames'
         );
@@ -80,7 +80,7 @@ public function testLocate()
         $loader = new FileLocator(__DIR__.'/Fixtures/Again');
 
         $this->assertEquals(
-            array(__DIR__.'/Fixtures'.DIRECTORY_SEPARATOR.'foo.xml', __DIR__.'/Fixtures/Again'.DIRECTORY_SEPARATOR.'foo.xml'),
+            array(__DIR__.'/Fixtures'.\DIRECTORY_SEPARATOR.'foo.xml', __DIR__.'/Fixtures/Again'.\DIRECTORY_SEPARATOR.'foo.xml'),
             $loader->locate('foo.xml', __DIR__.'/Fixtures', false),
             '->locate() returns an array of absolute filenames'
         );
diff --git a/src/Symfony/Component/Config/Tests/Loader/DelegatingLoaderTest.php b/src/Symfony/Component/Config/Tests/Loader/DelegatingLoaderTest.php
index 4a01d26adf22..3f4b21f34b09 100644
--- a/src/Symfony/Component/Config/Tests/Loader/DelegatingLoaderTest.php
+++ b/src/Symfony/Component/Config/Tests/Loader/DelegatingLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Config\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\Config\Loader\DelegatingLoader;
+use Symfony\Component\Config\Loader\LoaderResolver;
 
 class DelegatingLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Config/Tests/Loader/FileLoaderTest.php b/src/Symfony/Component/Config/Tests/Loader/FileLoaderTest.php
index c6e283c74919..f8409df9d743 100644
--- a/src/Symfony/Component/Config/Tests/Loader/FileLoaderTest.php
+++ b/src/Symfony/Component/Config/Tests/Loader/FileLoaderTest.php
@@ -88,7 +88,7 @@ public function testImportWithSimpleGlob()
     {
         $loader = new TestFileLoader(new FileLocator(__DIR__));
 
-        $this->assertSame(__FILE__, strtr($loader->import('FileLoaderTest.*'), '/', DIRECTORY_SEPARATOR));
+        $this->assertSame(__FILE__, strtr($loader->import('FileLoaderTest.*'), '/', \DIRECTORY_SEPARATOR));
     }
 }
 
diff --git a/src/Symfony/Component/Config/Tests/Loader/LoaderTest.php b/src/Symfony/Component/Config/Tests/Loader/LoaderTest.php
index fefb1d728f44..30167e3836f8 100644
--- a/src/Symfony/Component/Config/Tests/Loader/LoaderTest.php
+++ b/src/Symfony/Component/Config/Tests/Loader/LoaderTest.php
@@ -109,7 +109,7 @@ public function load($resource, $type = null)
 
     public function supports($resource, $type = null)
     {
-        return is_string($resource) && 'foo' === pathinfo($resource, PATHINFO_EXTENSION);
+        return \is_string($resource) && 'foo' === pathinfo($resource, PATHINFO_EXTENSION);
     }
 
     public function getType()
diff --git a/src/Symfony/Component/Config/Tests/Resource/ClassExistenceResourceTest.php b/src/Symfony/Component/Config/Tests/Resource/ClassExistenceResourceTest.php
index 010b6561a235..79bc64d69b9a 100644
--- a/src/Symfony/Component/Config/Tests/Resource/ClassExistenceResourceTest.php
+++ b/src/Symfony/Component/Config/Tests/Resource/ClassExistenceResourceTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Config\Resource\ClassExistenceResource;
-use Symfony\Component\Config\Tests\Fixtures\Resource\ConditionalClass;
 use Symfony\Component\Config\Tests\Fixtures\BadParent;
+use Symfony\Component\Config\Tests\Fixtures\Resource\ConditionalClass;
 
 class ClassExistenceResourceTest extends TestCase
 {
diff --git a/src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php b/src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php
index c37c3e2fc7a3..cf20e43b5002 100644
--- a/src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php
+++ b/src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php
@@ -20,7 +20,7 @@ class DirectoryResourceTest extends TestCase
 
     protected function setUp()
     {
-        $this->directory = sys_get_temp_dir().DIRECTORY_SEPARATOR.'symfonyDirectoryIterator';
+        $this->directory = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'symfonyDirectoryIterator';
         if (!file_exists($this->directory)) {
             mkdir($this->directory);
         }
diff --git a/src/Symfony/Component/Config/Tests/Resource/GlobResourceTest.php b/src/Symfony/Component/Config/Tests/Resource/GlobResourceTest.php
index bf7291fdd66b..c66770c3051c 100644
--- a/src/Symfony/Component/Config/Tests/Resource/GlobResourceTest.php
+++ b/src/Symfony/Component/Config/Tests/Resource/GlobResourceTest.php
@@ -18,7 +18,7 @@ class GlobResourceTest extends TestCase
 {
     protected function tearDown()
     {
-        $dir = dirname(__DIR__).'/Fixtures';
+        $dir = \dirname(__DIR__).'/Fixtures';
         @rmdir($dir.'/TmpGlob');
         @unlink($dir.'/TmpGlob');
         @unlink($dir.'/Resource/TmpGlob');
@@ -27,12 +27,12 @@ protected function tearDown()
 
     public function testIterator()
     {
-        $dir = dirname(__DIR__).DIRECTORY_SEPARATOR.'Fixtures';
+        $dir = \dirname(__DIR__).\DIRECTORY_SEPARATOR.'Fixtures';
         $resource = new GlobResource($dir, '/Resource', true);
 
         $paths = iterator_to_array($resource);
 
-        $file = $dir.'/Resource'.DIRECTORY_SEPARATOR.'ConditionalClass.php';
+        $file = $dir.'/Resource'.\DIRECTORY_SEPARATOR.'ConditionalClass.php';
         $this->assertEquals(array($file => new \SplFileInfo($file)), $paths);
         $this->assertInstanceOf('SplFileInfo', current($paths));
         $this->assertSame($dir, $resource->getPrefix());
@@ -41,7 +41,7 @@ public function testIterator()
 
         $paths = iterator_to_array($resource);
 
-        $file = $dir.DIRECTORY_SEPARATOR.'Resource'.DIRECTORY_SEPARATOR.'ConditionalClass.php';
+        $file = $dir.\DIRECTORY_SEPARATOR.'Resource'.\DIRECTORY_SEPARATOR.'ConditionalClass.php';
         $this->assertEquals(array($file => $file), $paths);
         $this->assertInstanceOf('SplFileInfo', current($paths));
         $this->assertSame($dir, $resource->getPrefix());
@@ -49,7 +49,7 @@ public function testIterator()
 
     public function testIsFreshNonRecursiveDetectsNewFile()
     {
-        $dir = dirname(__DIR__).'/Fixtures';
+        $dir = \dirname(__DIR__).'/Fixtures';
         $resource = new GlobResource($dir, '/*', false);
 
         $this->assertTrue($resource->isFresh(0));
@@ -69,7 +69,7 @@ public function testIsFreshNonRecursiveDetectsNewFile()
 
     public function testIsFreshNonRecursiveDetectsRemovedFile()
     {
-        $dir = dirname(__DIR__).'/Fixtures';
+        $dir = \dirname(__DIR__).'/Fixtures';
         $resource = new GlobResource($dir, '/*', false);
 
         touch($dir.'/TmpGlob');
@@ -85,7 +85,7 @@ public function testIsFreshNonRecursiveDetectsRemovedFile()
 
     public function testIsFreshRecursiveDetectsRemovedFile()
     {
-        $dir = dirname(__DIR__).'/Fixtures';
+        $dir = \dirname(__DIR__).'/Fixtures';
         $resource = new GlobResource($dir, '/*', true);
 
         touch($dir.'/Resource/TmpGlob');
@@ -103,7 +103,7 @@ public function testIsFreshRecursiveDetectsRemovedFile()
 
     public function testIsFreshRecursiveDetectsNewFile()
     {
-        $dir = dirname(__DIR__).'/Fixtures';
+        $dir = \dirname(__DIR__).'/Fixtures';
         $resource = new GlobResource($dir, '/*', true);
 
         $this->assertTrue($resource->isFresh(0));
diff --git a/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php b/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
index 371c7baa1cc7..bb29ac02a4ef 100644
--- a/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
+++ b/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Config\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Config\Tests\Resource\ResourceStub;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\ResourceCheckerConfigCache;
+use Symfony\Component\Config\Tests\Resource\ResourceStub;
 
 class ResourceCheckerConfigCacheTest extends TestCase
 {
diff --git a/src/Symfony/Component/Config/Util/XmlUtils.php b/src/Symfony/Component/Config/Util/XmlUtils.php
index e1c4a4ad3f01..d761e4e80fba 100644
--- a/src/Symfony/Component/Config/Util/XmlUtils.php
+++ b/src/Symfony/Component/Config/Util/XmlUtils.php
@@ -46,7 +46,7 @@ private function __construct()
      */
     public static function parse($content, $schemaOrCallable = null)
     {
-        if (!extension_loaded('dom')) {
+        if (!\extension_loaded('dom')) {
             throw new \RuntimeException('Extension DOM is required.');
         }
 
@@ -56,7 +56,7 @@ public static function parse($content, $schemaOrCallable = null)
 
         $dom = new \DOMDocument();
         $dom->validateOnParse = true;
-        if (!$dom->loadXML($content, LIBXML_NONET | (defined('LIBXML_COMPACT') ? LIBXML_COMPACT : 0))) {
+        if (!$dom->loadXML($content, LIBXML_NONET | (\defined('LIBXML_COMPACT') ? LIBXML_COMPACT : 0))) {
             libxml_disable_entity_loader($disableEntities);
 
             throw new XmlParsingException(implode("\n", static::getXmlErrors($internalErrors)));
@@ -78,13 +78,13 @@ public static function parse($content, $schemaOrCallable = null)
             libxml_clear_errors();
 
             $e = null;
-            if (is_callable($schemaOrCallable)) {
+            if (\is_callable($schemaOrCallable)) {
                 try {
-                    $valid = call_user_func($schemaOrCallable, $dom, $internalErrors);
+                    $valid = \call_user_func($schemaOrCallable, $dom, $internalErrors);
                 } catch (\Exception $e) {
                     $valid = false;
                 }
-            } elseif (!is_array($schemaOrCallable) && is_file((string) $schemaOrCallable)) {
+            } elseif (!\is_array($schemaOrCallable) && is_file((string) $schemaOrCallable)) {
                 $schemaSource = file_get_contents((string) $schemaOrCallable);
                 $valid = @$dom->schemaValidateSource($schemaSource);
             } else {
@@ -160,7 +160,7 @@ public static function convertDomElementToArray(\DOMElement $element, $checkPref
         $empty = true;
         $config = array();
         foreach ($element->attributes as $name => $node) {
-            if ($checkPrefix && !in_array((string) $node->prefix, array('', $prefix), true)) {
+            if ($checkPrefix && !\in_array((string) $node->prefix, array('', $prefix), true)) {
                 continue;
             }
             $config[$name] = static::phpize($node->value);
@@ -181,7 +181,7 @@ public static function convertDomElementToArray(\DOMElement $element, $checkPref
 
                 $key = $node->localName;
                 if (isset($config[$key])) {
-                    if (!is_array($config[$key]) || !is_int(key($config[$key]))) {
+                    if (!\is_array($config[$key]) || !\is_int(key($config[$key]))) {
                         $config[$key] = array($config[$key]);
                     }
                     $config[$key][] = $value;
@@ -195,7 +195,7 @@ public static function convertDomElementToArray(\DOMElement $element, $checkPref
 
         if (false !== $nodeValue) {
             $value = static::phpize($nodeValue);
-            if (count($config)) {
+            if (\count($config)) {
                 $config['value'] = $value;
             } else {
                 $config = $value;
diff --git a/src/Symfony/Component/Console/Application.php b/src/Symfony/Component/Console/Application.php
index 00e941f13238..c239e0f1190b 100644
--- a/src/Symfony/Component/Console/Application.php
+++ b/src/Symfony/Component/Console/Application.php
@@ -11,34 +11,34 @@
 
 namespace Symfony\Component\Console;
 
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Command\HelpCommand;
+use Symfony\Component\Console\Command\ListCommand;
 use Symfony\Component\Console\CommandLoader\CommandLoaderInterface;
+use Symfony\Component\Console\Event\ConsoleCommandEvent;
+use Symfony\Component\Console\Event\ConsoleErrorEvent;
+use Symfony\Component\Console\Event\ConsoleTerminateEvent;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
 use Symfony\Component\Console\Exception\ExceptionInterface;
+use Symfony\Component\Console\Exception\LogicException;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Helper\DebugFormatterHelper;
+use Symfony\Component\Console\Helper\FormatterHelper;
 use Symfony\Component\Console\Helper\Helper;
+use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Helper\ProcessHelper;
 use Symfony\Component\Console\Helper\QuestionHelper;
-use Symfony\Component\Console\Input\InputInterface;
-use Symfony\Component\Console\Input\StreamableInputInterface;
 use Symfony\Component\Console\Input\ArgvInput;
 use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Input\InputDefinition;
-use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputAwareInterface;
-use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Input\InputDefinition;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Input\StreamableInputInterface;
 use Symfony\Component\Console\Output\ConsoleOutput;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
-use Symfony\Component\Console\Command\Command;
-use Symfony\Component\Console\Command\HelpCommand;
-use Symfony\Component\Console\Command\ListCommand;
-use Symfony\Component\Console\Helper\HelperSet;
-use Symfony\Component\Console\Helper\FormatterHelper;
-use Symfony\Component\Console\Event\ConsoleCommandEvent;
-use Symfony\Component\Console\Event\ConsoleErrorEvent;
-use Symfony\Component\Console\Event\ConsoleTerminateEvent;
-use Symfony\Component\Console\Exception\CommandNotFoundException;
-use Symfony\Component\Console\Exception\LogicException;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Debug\ErrorHandler;
 use Symfony\Component\Debug\Exception\FatalThrowableError;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
@@ -130,7 +130,7 @@ public function run(InputInterface $input = null, OutputInterface $output = null
         };
         if ($phpHandler = set_exception_handler($renderException)) {
             restore_exception_handler();
-            if (!is_array($phpHandler) || !$phpHandler[0] instanceof ErrorHandler) {
+            if (!\is_array($phpHandler) || !$phpHandler[0] instanceof ErrorHandler) {
                 $debugHandler = true;
             } elseif ($debugHandler = $phpHandler[0]->setExceptionHandler($renderException)) {
                 $phpHandler[0]->setExceptionHandler($debugHandler);
@@ -444,11 +444,11 @@ public function add(Command $command)
         }
 
         if (null === $command->getDefinition()) {
-            throw new LogicException(sprintf('Command class "%s" is not correctly initialized. You probably forgot to call the parent constructor.', get_class($command)));
+            throw new LogicException(sprintf('Command class "%s" is not correctly initialized. You probably forgot to call the parent constructor.', \get_class($command)));
         }
 
         if (!$command->getName()) {
-            throw new LogicException(sprintf('The command defined in "%s" cannot have an empty name.', get_class($command)));
+            throw new LogicException(sprintf('The command defined in "%s" cannot have an empty name.', \get_class($command)));
         }
 
         $this->commands[$command->getName()] = $command;
@@ -545,7 +545,7 @@ public function findNamespace($namespace)
             $message = sprintf('There are no commands defined in the "%s" namespace.', $namespace);
 
             if ($alternatives = $this->findAlternatives($namespace, $allNamespaces)) {
-                if (1 == count($alternatives)) {
+                if (1 == \count($alternatives)) {
                     $message .= "\n\nDid you mean this?\n    ";
                 } else {
                     $message .= "\n\nDid you mean one of these?\n    ";
@@ -557,8 +557,8 @@ public function findNamespace($namespace)
             throw new CommandNotFoundException($message, $alternatives);
         }
 
-        $exact = in_array($namespace, $namespaces, true);
-        if (count($namespaces) > 1 && !$exact) {
+        $exact = \in_array($namespace, $namespaces, true);
+        if (\count($namespaces) > 1 && !$exact) {
             throw new CommandNotFoundException(sprintf("The namespace \"%s\" is ambiguous.\nDid you mean one of these?\n%s", $namespace, $this->getAbbreviationSuggestions(array_values($namespaces))), array_values($namespaces));
         }
 
@@ -591,7 +591,7 @@ public function find($name)
         }
 
         // if no commands matched or we just matched namespaces
-        if (empty($commands) || count(preg_grep('{^'.$expr.'$}i', $commands)) < 1) {
+        if (empty($commands) || \count(preg_grep('{^'.$expr.'$}i', $commands)) < 1) {
             if (false !== $pos = strrpos($name, ':')) {
                 // check if a namespace exists and contains commands
                 $this->findNamespace(substr($name, 0, $pos));
@@ -600,7 +600,7 @@ public function find($name)
             $message = sprintf('Command "%s" is not defined.', $name);
 
             if ($alternatives = $this->findAlternatives($name, $allCommands)) {
-                if (1 == count($alternatives)) {
+                if (1 == \count($alternatives)) {
                     $message .= "\n\nDid you mean this?\n    ";
                 } else {
                     $message .= "\n\nDid you mean one of these?\n    ";
@@ -612,18 +612,18 @@ public function find($name)
         }
 
         // filter out aliases for commands which are already on the list
-        if (count($commands) > 1) {
+        if (\count($commands) > 1) {
             $commandList = $this->commandLoader ? array_merge(array_flip($this->commandLoader->getNames()), $this->commands) : $this->commands;
             $commands = array_unique(array_filter($commands, function ($nameOrAlias) use ($commandList, $commands, &$aliases) {
                 $commandName = $commandList[$nameOrAlias] instanceof Command ? $commandList[$nameOrAlias]->getName() : $nameOrAlias;
                 $aliases[$nameOrAlias] = $commandName;
 
-                return $commandName === $nameOrAlias || !in_array($commandName, $commands);
+                return $commandName === $nameOrAlias || !\in_array($commandName, $commands);
             }));
         }
 
-        $exact = in_array($name, $commands, true) || isset($aliases[$name]);
-        if (count($commands) > 1 && !$exact) {
+        $exact = \in_array($name, $commands, true) || isset($aliases[$name]);
+        if (\count($commands) > 1 && !$exact) {
             $usableWidth = $this->terminal->getWidth() - 10;
             $abbrevs = array_values($commands);
             $maxLen = 0;
@@ -703,7 +703,7 @@ public static function getAbbreviations($names)
     {
         $abbrevs = array();
         foreach ($names as $name) {
-            for ($len = strlen($name); $len > 0; --$len) {
+            for ($len = \strlen($name); $len > 0; --$len) {
                 $abbrev = substr($name, 0, $len);
                 $abbrevs[$abbrev][] = $name;
             }
@@ -732,7 +732,7 @@ protected function doRenderException(\Exception $e, OutputInterface $output)
         do {
             $message = trim($e->getMessage());
             if ('' === $message || OutputInterface::VERBOSITY_VERBOSE <= $output->getVerbosity()) {
-                $title = sprintf('  [%s%s]  ', get_class($e), 0 !== ($code = $e->getCode()) ? ' ('.$code.')' : '');
+                $title = sprintf('  [%s%s]  ', \get_class($e), 0 !== ($code = $e->getCode()) ? ' ('.$code.')' : '');
                 $len = Helper::strlen($title);
             } else {
                 $len = 0;
@@ -772,7 +772,7 @@ protected function doRenderException(\Exception $e, OutputInterface $output)
                 // exception related properties
                 $trace = $e->getTrace();
 
-                for ($i = 0, $count = count($trace); $i < $count; ++$i) {
+                for ($i = 0, $count = \count($trace); $i < $count; ++$i) {
                     $class = isset($trace[$i]['class']) ? $trace[$i]['class'] : '';
                     $type = isset($trace[$i]['type']) ? $trace[$i]['type'] : '';
                     $function = $trace[$i]['function'];
@@ -800,7 +800,7 @@ protected function configureIO(InputInterface $input, OutputInterface $output)
 
         if (true === $input->hasParameterOption(array('--no-interaction', '-n'), true)) {
             $input->setInteractive(false);
-        } elseif (function_exists('posix_isatty')) {
+        } elseif (\function_exists('posix_isatty')) {
             $inputStream = null;
 
             if ($input instanceof StreamableInputInterface) {
@@ -986,7 +986,7 @@ public function extractNamespace($name, $limit = null)
         $parts = explode(':', $name);
         array_pop($parts);
 
-        return implode(':', null === $limit ? $parts : array_slice($parts, 0, $limit));
+        return implode(':', null === $limit ? $parts : \array_slice($parts, 0, $limit));
     }
 
     /**
@@ -1019,7 +1019,7 @@ private function findAlternatives($name, $collection)
                 }
 
                 $lev = levenshtein($subname, $parts[$i]);
-                if ($lev <= strlen($subname) / 3 || '' !== $subname && false !== strpos($parts[$i], $subname)) {
+                if ($lev <= \strlen($subname) / 3 || '' !== $subname && false !== strpos($parts[$i], $subname)) {
                     $alternatives[$collectionName] = $exists ? $alternatives[$collectionName] + $lev : $lev;
                 } elseif ($exists) {
                     $alternatives[$collectionName] += $threshold;
@@ -1029,7 +1029,7 @@ private function findAlternatives($name, $collection)
 
         foreach ($collection as $item) {
             $lev = levenshtein($name, $item);
-            if ($lev <= strlen($name) / 3 || false !== strpos($item, $name)) {
+            if ($lev <= \strlen($name) / 3 || false !== strpos($item, $name)) {
                 $alternatives[$item] = isset($alternatives[$item]) ? $alternatives[$item] - $lev : $lev;
             }
         }
@@ -1085,7 +1085,7 @@ private function splitStringByWidth($string, $width)
             $line = $char;
         }
 
-        $lines[] = count($lines) ? str_pad($line, $width) : $line;
+        $lines[] = \count($lines) ? str_pad($line, $width) : $line;
 
         mb_convert_variables($encoding, 'utf8', $lines);
 
@@ -1106,7 +1106,7 @@ private function extractAllNamespaces($name)
         $namespaces = array();
 
         foreach ($parts as $part) {
-            if (count($namespaces)) {
+            if (\count($namespaces)) {
                 $namespaces[] = end($namespaces).':'.$part;
             } else {
                 $namespaces[] = $part;
diff --git a/src/Symfony/Component/Console/Command/Command.php b/src/Symfony/Component/Console/Command/Command.php
index 62c3a834f6a2..38bb8b998c52 100644
--- a/src/Symfony/Component/Console/Command/Command.php
+++ b/src/Symfony/Component/Console/Command/Command.php
@@ -11,16 +11,16 @@
 
 namespace Symfony\Component\Console\Command;
 
+use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Exception\ExceptionInterface;
-use Symfony\Component\Console\Input\InputDefinition;
-use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Exception\InvalidArgumentException;
+use Symfony\Component\Console\Exception\LogicException;
+use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Application;
-use Symfony\Component\Console\Helper\HelperSet;
-use Symfony\Component\Console\Exception\InvalidArgumentException;
-use Symfony\Component\Console\Exception\LogicException;
 
 /**
  * Base class for all commands.
@@ -55,7 +55,7 @@ class Command
      */
     public static function getDefaultName()
     {
-        $class = get_called_class();
+        $class = \get_called_class();
         $r = new \ReflectionProperty($class, 'defaultName');
 
         return $class === $r->class ? static::$defaultName : null;
@@ -217,7 +217,7 @@ public function run(InputInterface $input, OutputInterface $output)
         $this->initialize($input, $output);
 
         if (null !== $this->processTitle) {
-            if (function_exists('cli_set_process_title')) {
+            if (\function_exists('cli_set_process_title')) {
                 if (!@cli_set_process_title($this->processTitle)) {
                     if ('Darwin' === PHP_OS) {
                         $output->writeln('<comment>Running "cli_set_process_title" as an unprivileged user is not supported on MacOS.</comment>', OutputInterface::VERBOSITY_VERY_VERBOSE);
@@ -225,7 +225,7 @@ public function run(InputInterface $input, OutputInterface $output)
                         cli_set_process_title($this->processTitle);
                     }
                 }
-            } elseif (function_exists('setproctitle')) {
+            } elseif (\function_exists('setproctitle')) {
                 setproctitle($this->processTitle);
             } elseif (OutputInterface::VERBOSITY_VERY_VERBOSE === $output->getVerbosity()) {
                 $output->writeln('<comment>Install the proctitle PECL to be able to change the process title.</comment>');
@@ -246,7 +246,7 @@ public function run(InputInterface $input, OutputInterface $output)
         $input->validate();
 
         if ($this->code) {
-            $statusCode = call_user_func($this->code, $input, $output);
+            $statusCode = \call_user_func($this->code, $input, $output);
         } else {
             $statusCode = $this->execute($input, $output);
         }
@@ -542,7 +542,7 @@ public function getProcessedHelp()
      */
     public function setAliases($aliases)
     {
-        if (!is_array($aliases) && !$aliases instanceof \Traversable) {
+        if (!\is_array($aliases) && !$aliases instanceof \Traversable) {
             throw new InvalidArgumentException('$aliases must be an array or an instance of \Traversable');
         }
 
diff --git a/src/Symfony/Component/Console/Command/HelpCommand.php b/src/Symfony/Component/Console/Command/HelpCommand.php
index 112679b34a80..1e20b008aab0 100644
--- a/src/Symfony/Component/Console/Command/HelpCommand.php
+++ b/src/Symfony/Component/Console/Command/HelpCommand.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Console\Helper\DescriptorHelper;
 use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 
 /**
diff --git a/src/Symfony/Component/Console/Command/ListCommand.php b/src/Symfony/Component/Console/Command/ListCommand.php
index 179ddea5dc21..5d932338c6ed 100644
--- a/src/Symfony/Component/Console/Command/ListCommand.php
+++ b/src/Symfony/Component/Console/Command/ListCommand.php
@@ -13,10 +13,10 @@
 
 use Symfony\Component\Console\Helper\DescriptorHelper;
 use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Input\InputDefinition;
 
 /**
  * ListCommand displays the list of all available commands for the application.
diff --git a/src/Symfony/Component/Console/Descriptor/Descriptor.php b/src/Symfony/Component/Console/Descriptor/Descriptor.php
index fe169cb48a35..151d84f72abf 100644
--- a/src/Symfony/Component/Console/Descriptor/Descriptor.php
+++ b/src/Symfony/Component/Console/Descriptor/Descriptor.php
@@ -13,11 +13,11 @@
 
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Exception\InvalidArgumentException;
 
 /**
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
@@ -55,7 +55,7 @@ public function describe(OutputInterface $output, $object, array $options = arra
                 $this->describeApplication($object, $options);
                 break;
             default:
-                throw new InvalidArgumentException(sprintf('Object of type "%s" is not describable.', get_class($object)));
+                throw new InvalidArgumentException(sprintf('Object of type "%s" is not describable.', \get_class($object)));
         }
     }
 
diff --git a/src/Symfony/Component/Console/Descriptor/MarkdownDescriptor.php b/src/Symfony/Component/Console/Descriptor/MarkdownDescriptor.php
index d52ba55342fa..6d8399f92213 100644
--- a/src/Symfony/Component/Console/Descriptor/MarkdownDescriptor.php
+++ b/src/Symfony/Component/Console/Descriptor/MarkdownDescriptor.php
@@ -88,7 +88,7 @@ protected function describeInputOption(InputOption $option, array $options = arr
      */
     protected function describeInputDefinition(InputDefinition $definition, array $options = array())
     {
-        if ($showArguments = count($definition->getArguments()) > 0) {
+        if ($showArguments = \count($definition->getArguments()) > 0) {
             $this->write('### Arguments');
             foreach ($definition->getArguments() as $argument) {
                 $this->write("\n\n");
@@ -96,7 +96,7 @@ protected function describeInputDefinition(InputDefinition $definition, array $o
             }
         }
 
-        if (count($definition->getOptions()) > 0) {
+        if (\count($definition->getOptions()) > 0) {
             if ($showArguments) {
                 $this->write("\n\n");
             }
diff --git a/src/Symfony/Component/Console/Descriptor/TextDescriptor.php b/src/Symfony/Component/Console/Descriptor/TextDescriptor.php
index ac848184c032..62d88c793ebb 100644
--- a/src/Symfony/Component/Console/Descriptor/TextDescriptor.php
+++ b/src/Symfony/Component/Console/Descriptor/TextDescriptor.php
@@ -33,14 +33,14 @@ class TextDescriptor extends Descriptor
      */
     protected function describeInputArgument(InputArgument $argument, array $options = array())
     {
-        if (null !== $argument->getDefault() && (!is_array($argument->getDefault()) || count($argument->getDefault()))) {
+        if (null !== $argument->getDefault() && (!\is_array($argument->getDefault()) || \count($argument->getDefault()))) {
             $default = sprintf('<comment> [default: %s]</comment>', $this->formatDefaultValue($argument->getDefault()));
         } else {
             $default = '';
         }
 
         $totalWidth = isset($options['total_width']) ? $options['total_width'] : Helper::strlen($argument->getName());
-        $spacingWidth = $totalWidth - strlen($argument->getName());
+        $spacingWidth = $totalWidth - \strlen($argument->getName());
 
         $this->writeText(sprintf('  <info>%s</info>  %s%s%s',
             $argument->getName(),
@@ -56,7 +56,7 @@ protected function describeInputArgument(InputArgument $argument, array $options
      */
     protected function describeInputOption(InputOption $option, array $options = array())
     {
-        if ($option->acceptValue() && null !== $option->getDefault() && (!is_array($option->getDefault()) || count($option->getDefault()))) {
+        if ($option->acceptValue() && null !== $option->getDefault() && (!\is_array($option->getDefault()) || \count($option->getDefault()))) {
             $default = sprintf('<comment> [default: %s]</comment>', $this->formatDefaultValue($option->getDefault()));
         } else {
             $default = '';
@@ -117,7 +117,7 @@ protected function describeInputDefinition(InputDefinition $definition, array $o
 
             $this->writeText('<comment>Options:</comment>', $options);
             foreach ($definition->getOptions() as $option) {
-                if (strlen($option->getShortcut()) > 1) {
+                if (\strlen($option->getShortcut()) > 1) {
                     $laterOptions[] = $option;
                     continue;
                 }
@@ -202,7 +202,7 @@ protected function describeApplication(Application $application, array $options
             }
 
             // calculate max. width based on available commands per namespace
-            $width = $this->getColumnWidth(call_user_func_array('array_merge', array_map(function ($namespace) use ($commands) {
+            $width = $this->getColumnWidth(\call_user_func_array('array_merge', array_map(function ($namespace) use ($commands) {
                 return array_intersect($namespace['commands'], array_keys($commands));
             }, $namespaces)));
 
@@ -276,11 +276,11 @@ private function formatDefaultValue($default): string
             return 'INF';
         }
 
-        if (is_string($default)) {
+        if (\is_string($default)) {
             $default = OutputFormatter::escape($default);
-        } elseif (is_array($default)) {
+        } elseif (\is_array($default)) {
             foreach ($default as $key => $value) {
-                if (is_string($value)) {
+                if (\is_string($value)) {
                     $default[$key] = OutputFormatter::escape($value);
                 }
             }
diff --git a/src/Symfony/Component/Console/Descriptor/XmlDescriptor.php b/src/Symfony/Component/Console/Descriptor/XmlDescriptor.php
index a2eaca3b18ff..d0c6abddb4f2 100644
--- a/src/Symfony/Component/Console/Descriptor/XmlDescriptor.php
+++ b/src/Symfony/Component/Console/Descriptor/XmlDescriptor.php
@@ -200,7 +200,7 @@ private function getInputArgumentDocument(InputArgument $argument): \DOMDocument
         $descriptionXML->appendChild($dom->createTextNode($argument->getDescription()));
 
         $objectXML->appendChild($defaultsXML = $dom->createElement('defaults'));
-        $defaults = is_array($argument->getDefault()) ? $argument->getDefault() : (is_bool($argument->getDefault()) ? array(var_export($argument->getDefault(), true)) : ($argument->getDefault() ? array($argument->getDefault()) : array()));
+        $defaults = \is_array($argument->getDefault()) ? $argument->getDefault() : (\is_bool($argument->getDefault()) ? array(var_export($argument->getDefault(), true)) : ($argument->getDefault() ? array($argument->getDefault()) : array()));
         foreach ($defaults as $default) {
             $defaultsXML->appendChild($defaultXML = $dom->createElement('default'));
             $defaultXML->appendChild($dom->createTextNode($default));
@@ -229,7 +229,7 @@ private function getInputOptionDocument(InputOption $option): \DOMDocument
         $descriptionXML->appendChild($dom->createTextNode($option->getDescription()));
 
         if ($option->acceptValue()) {
-            $defaults = is_array($option->getDefault()) ? $option->getDefault() : (is_bool($option->getDefault()) ? array(var_export($option->getDefault(), true)) : ($option->getDefault() ? array($option->getDefault()) : array()));
+            $defaults = \is_array($option->getDefault()) ? $option->getDefault() : (\is_bool($option->getDefault()) ? array(var_export($option->getDefault(), true)) : ($option->getDefault() ? array($option->getDefault()) : array()));
             $objectXML->appendChild($defaultsXML = $dom->createElement('defaults'));
 
             if (!empty($defaults)) {
diff --git a/src/Symfony/Component/Console/Event/ConsoleErrorEvent.php b/src/Symfony/Component/Console/Event/ConsoleErrorEvent.php
index 3665da77d915..25d9b88127cf 100644
--- a/src/Symfony/Component/Console/Event/ConsoleErrorEvent.php
+++ b/src/Symfony/Component/Console/Event/ConsoleErrorEvent.php
@@ -53,6 +53,6 @@ public function setExitCode(int $exitCode): void
 
     public function getExitCode(): int
     {
-        return null !== $this->exitCode ? $this->exitCode : (is_int($this->error->getCode()) && 0 !== $this->error->getCode() ? $this->error->getCode() : 1);
+        return null !== $this->exitCode ? $this->exitCode : (\is_int($this->error->getCode()) && 0 !== $this->error->getCode() ? $this->error->getCode() : 1);
     }
 }
diff --git a/src/Symfony/Component/Console/Formatter/OutputFormatter.php b/src/Symfony/Component/Console/Formatter/OutputFormatter.php
index a78bd952051c..eebac82e70ef 100644
--- a/src/Symfony/Component/Console/Formatter/OutputFormatter.php
+++ b/src/Symfony/Component/Console/Formatter/OutputFormatter.php
@@ -50,10 +50,10 @@ public static function escape($text)
     public static function escapeTrailingBackslash($text)
     {
         if ('\\' === substr($text, -1)) {
-            $len = strlen($text);
+            $len = \strlen($text);
             $text = rtrim($text, '\\');
             $text = str_replace("\0", '', $text);
-            $text .= str_repeat("\0", $len - strlen($text));
+            $text .= str_repeat("\0", $len - \strlen($text));
         }
 
         return $text;
@@ -145,7 +145,7 @@ public function format($message)
 
             // add the text up to the next tag
             $output .= $this->applyCurrentStyle(substr($message, $offset, $pos - $offset));
-            $offset = $pos + strlen($text);
+            $offset = $pos + \strlen($text);
 
             // opening tag?
             if ($open = '/' != $text[1]) {
@@ -225,6 +225,6 @@ private function createStyleFromString(string $string)
      */
     private function applyCurrentStyle(string $text): string
     {
-        return $this->isDecorated() && strlen($text) > 0 ? $this->styleStack->getCurrent()->apply($text) : $text;
+        return $this->isDecorated() && \strlen($text) > 0 ? $this->styleStack->getCurrent()->apply($text) : $text;
     }
 }
diff --git a/src/Symfony/Component/Console/Formatter/OutputFormatterStyle.php b/src/Symfony/Component/Console/Formatter/OutputFormatterStyle.php
index 900f2ef31b05..d09994f2253b 100644
--- a/src/Symfony/Component/Console/Formatter/OutputFormatterStyle.php
+++ b/src/Symfony/Component/Console/Formatter/OutputFormatterStyle.php
@@ -69,7 +69,7 @@ public function __construct(string $foreground = null, string $background = null
         if (null !== $background) {
             $this->setBackground($background);
         }
-        if (count($options)) {
+        if (\count($options)) {
             $this->setOptions($options);
         }
     }
@@ -143,7 +143,7 @@ public function setOption($option)
             ));
         }
 
-        if (!in_array(static::$availableOptions[$option], $this->options)) {
+        if (!\in_array(static::$availableOptions[$option], $this->options)) {
             $this->options[] = static::$availableOptions[$option];
         }
     }
@@ -203,14 +203,14 @@ public function apply($text)
             $setCodes[] = $this->background['set'];
             $unsetCodes[] = $this->background['unset'];
         }
-        if (count($this->options)) {
+        if (\count($this->options)) {
             foreach ($this->options as $option) {
                 $setCodes[] = $option['set'];
                 $unsetCodes[] = $option['unset'];
             }
         }
 
-        if (0 === count($setCodes)) {
+        if (0 === \count($setCodes)) {
             return $text;
         }
 
diff --git a/src/Symfony/Component/Console/Formatter/OutputFormatterStyleStack.php b/src/Symfony/Component/Console/Formatter/OutputFormatterStyleStack.php
index bf0beb709ed1..9e7283c2f84c 100644
--- a/src/Symfony/Component/Console/Formatter/OutputFormatterStyleStack.php
+++ b/src/Symfony/Component/Console/Formatter/OutputFormatterStyleStack.php
@@ -66,7 +66,7 @@ public function pop(OutputFormatterStyleInterface $style = null)
 
         foreach (array_reverse($this->styles, true) as $index => $stackedStyle) {
             if ($style->apply('') === $stackedStyle->apply('')) {
-                $this->styles = array_slice($this->styles, 0, $index);
+                $this->styles = \array_slice($this->styles, 0, $index);
 
                 return $stackedStyle;
             }
@@ -86,7 +86,7 @@ public function getCurrent()
             return $this->emptyStyle;
         }
 
-        return $this->styles[count($this->styles) - 1];
+        return $this->styles[\count($this->styles) - 1];
     }
 
     /**
diff --git a/src/Symfony/Component/Console/Helper/DebugFormatterHelper.php b/src/Symfony/Component/Console/Helper/DebugFormatterHelper.php
index 1119b795c8b8..f5393edee3d9 100644
--- a/src/Symfony/Component/Console/Helper/DebugFormatterHelper.php
+++ b/src/Symfony/Component/Console/Helper/DebugFormatterHelper.php
@@ -35,7 +35,7 @@ class DebugFormatterHelper extends Helper
      */
     public function start($id, $message, $prefix = 'RUN')
     {
-        $this->started[$id] = array('border' => ++$this->count % count($this->colors));
+        $this->started[$id] = array('border' => ++$this->count % \count($this->colors));
 
         return sprintf("%s<bg=blue;fg=white> %s </> <fg=blue>%s</>\n", $this->getBorder($id), $prefix, $message);
     }
diff --git a/src/Symfony/Component/Console/Helper/DescriptorHelper.php b/src/Symfony/Component/Console/Helper/DescriptorHelper.php
index 6f5c81834ccd..54d3b1afc1a4 100644
--- a/src/Symfony/Component/Console/Helper/DescriptorHelper.php
+++ b/src/Symfony/Component/Console/Helper/DescriptorHelper.php
@@ -16,8 +16,8 @@
 use Symfony\Component\Console\Descriptor\MarkdownDescriptor;
 use Symfony\Component\Console\Descriptor\TextDescriptor;
 use Symfony\Component\Console\Descriptor\XmlDescriptor;
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
+use Symfony\Component\Console\Output\OutputInterface;
 
 /**
  * This class adds helper method to describe objects in various formats.
diff --git a/src/Symfony/Component/Console/Helper/FormatterHelper.php b/src/Symfony/Component/Console/Helper/FormatterHelper.php
index 6a48a77f2690..79ab2849e51a 100644
--- a/src/Symfony/Component/Console/Helper/FormatterHelper.php
+++ b/src/Symfony/Component/Console/Helper/FormatterHelper.php
@@ -45,7 +45,7 @@ public function formatSection($section, $message, $style = 'info')
      */
     public function formatBlock($messages, $style, $large = false)
     {
-        if (!is_array($messages)) {
+        if (!\is_array($messages)) {
             $messages = array($messages);
         }
 
diff --git a/src/Symfony/Component/Console/Helper/Helper.php b/src/Symfony/Component/Console/Helper/Helper.php
index 0954bad6b2df..509018552626 100644
--- a/src/Symfony/Component/Console/Helper/Helper.php
+++ b/src/Symfony/Component/Console/Helper/Helper.php
@@ -48,7 +48,7 @@ public function getHelperSet()
     public static function strlen($string)
     {
         if (false === $encoding = mb_detect_encoding($string, null, true)) {
-            return strlen($string);
+            return \strlen($string);
         }
 
         return mb_strwidth($string, $encoding);
@@ -89,9 +89,9 @@ public static function formatTime($secs)
         foreach ($timeFormats as $index => $format) {
             if ($secs >= $format[0]) {
                 if ((isset($timeFormats[$index + 1]) && $secs < $timeFormats[$index + 1][0])
-                    || $index == count($timeFormats) - 1
+                    || $index == \count($timeFormats) - 1
                 ) {
-                    if (2 == count($format)) {
+                    if (2 == \count($format)) {
                         return $format[1];
                     }
 
diff --git a/src/Symfony/Component/Console/Helper/HelperSet.php b/src/Symfony/Component/Console/Helper/HelperSet.php
index 24ce18fb49c9..4c44b05f562c 100644
--- a/src/Symfony/Component/Console/Helper/HelperSet.php
+++ b/src/Symfony/Component/Console/Helper/HelperSet.php
@@ -33,7 +33,7 @@ class HelperSet implements \IteratorAggregate
     public function __construct(array $helpers = array())
     {
         foreach ($helpers as $alias => $helper) {
-            $this->set($helper, is_int($alias) ? null : $alias);
+            $this->set($helper, \is_int($alias) ? null : $alias);
         }
     }
 
diff --git a/src/Symfony/Component/Console/Helper/InputAwareHelper.php b/src/Symfony/Component/Console/Helper/InputAwareHelper.php
index 4261767423b5..0d0dba23e330 100644
--- a/src/Symfony/Component/Console/Helper/InputAwareHelper.php
+++ b/src/Symfony/Component/Console/Helper/InputAwareHelper.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Console\Helper;
 
-use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputAwareInterface;
+use Symfony\Component\Console\Input\InputInterface;
 
 /**
  * An implementation of InputAwareInterface for Helpers.
diff --git a/src/Symfony/Component/Console/Helper/ProcessHelper.php b/src/Symfony/Component/Console/Helper/ProcessHelper.php
index 82935baeaa81..666f114a23c4 100644
--- a/src/Symfony/Component/Console/Helper/ProcessHelper.php
+++ b/src/Symfony/Component/Console/Helper/ProcessHelper.php
@@ -121,7 +121,7 @@ public function wrapCallback(OutputInterface $output, Process $process, callable
             $output->write($formatter->progress(spl_object_hash($process), $this->escapeString($buffer), Process::ERR === $type));
 
             if (null !== $callback) {
-                call_user_func($callback, $type, $buffer);
+                \call_user_func($callback, $type, $buffer);
             }
         };
     }
diff --git a/src/Symfony/Component/Console/Helper/ProgressBar.php b/src/Symfony/Component/Console/Helper/ProgressBar.php
index 7c0c09a97d37..0fd81d034c84 100644
--- a/src/Symfony/Component/Console/Helper/ProgressBar.php
+++ b/src/Symfony/Component/Console/Helper/ProgressBar.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Console\Helper;
 
+use Symfony\Component\Console\Exception\LogicException;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Exception\LogicException;
 use Symfony\Component\Console\Terminal;
 
 /**
@@ -489,7 +489,7 @@ private function buildLine(): string
         $regex = "{%([a-z\-_]+)(?:\:([^%]+))?%}i";
         $callback = function ($matches) {
             if ($formatter = $this::getPlaceholderFormatterDefinition($matches[1])) {
-                $text = call_user_func($formatter, $this, $this->output);
+                $text = \call_user_func($formatter, $this, $this->output);
             } elseif (isset($this->messages[$matches[1]])) {
                 $text = $this->messages[$matches[1]];
             } else {
diff --git a/src/Symfony/Component/Console/Helper/ProgressIndicator.php b/src/Symfony/Component/Console/Helper/ProgressIndicator.php
index e6094647fa31..fe516df03007 100644
--- a/src/Symfony/Component/Console/Helper/ProgressIndicator.php
+++ b/src/Symfony/Component/Console/Helper/ProgressIndicator.php
@@ -53,7 +53,7 @@ public function __construct(OutputInterface $output, string $format = null, int
 
         $indicatorValues = array_values($indicatorValues);
 
-        if (2 > count($indicatorValues)) {
+        if (2 > \count($indicatorValues)) {
             throw new InvalidArgumentException('Must have at least 2 indicator value characters.');
         }
 
@@ -196,7 +196,7 @@ private function display()
 
         $this->overwrite(preg_replace_callback("{%([a-z\-_]+)(?:\:([^%]+))?%}i", function ($matches) use ($self) {
             if ($formatter = $self::getPlaceholderFormatterDefinition($matches[1])) {
-                return call_user_func($formatter, $self);
+                return \call_user_func($formatter, $self);
             }
 
             return $matches[0];
@@ -239,7 +239,7 @@ private static function initPlaceholderFormatters()
     {
         return array(
             'indicator' => function (ProgressIndicator $indicator) {
-                return $indicator->indicatorValues[$indicator->indicatorCurrent % count($indicator->indicatorValues)];
+                return $indicator->indicatorValues[$indicator->indicatorCurrent % \count($indicator->indicatorValues)];
             },
             'message' => function (ProgressIndicator $indicator) {
                 return $indicator->message;
diff --git a/src/Symfony/Component/Console/Helper/QuestionHelper.php b/src/Symfony/Component/Console/Helper/QuestionHelper.php
index 46e1383e786d..a0141c83cd2a 100644
--- a/src/Symfony/Component/Console/Helper/QuestionHelper.php
+++ b/src/Symfony/Component/Console/Helper/QuestionHelper.php
@@ -18,8 +18,8 @@
 use Symfony\Component\Console\Input\StreamableInputInterface;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Question\Question;
 use Symfony\Component\Console\Question\ChoiceQuestion;
+use Symfony\Component\Console\Question\Question;
 
 /**
  * The QuestionHelper class provides helpers to interact with the user.
@@ -120,10 +120,10 @@ private function doAsk(OutputInterface $output, Question $question)
                 $ret = trim($ret);
             }
         } else {
-            $ret = trim($this->autocomplete($output, $question, $inputStream, is_array($autocomplete) ? $autocomplete : iterator_to_array($autocomplete, false)));
+            $ret = trim($this->autocomplete($output, $question, $inputStream, \is_array($autocomplete) ? $autocomplete : iterator_to_array($autocomplete, false)));
         }
 
-        $ret = strlen($ret) > 0 ? $ret : $question->getDefault();
+        $ret = \strlen($ret) > 0 ? $ret : $question->getDefault();
 
         if ($normalizer = $question->getNormalizer()) {
             return $normalizer($ret);
@@ -184,7 +184,7 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
         $i = 0;
         $ofs = -1;
         $matches = $autocomplete;
-        $numMatches = count($matches);
+        $numMatches = \count($matches);
 
         $sttyMode = shell_exec('stty -g');
 
@@ -209,7 +209,7 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
                 if (0 === $i) {
                     $ofs = -1;
                     $matches = $autocomplete;
-                    $numMatches = count($matches);
+                    $numMatches = \count($matches);
                 } else {
                     $numMatches = 0;
                 }
@@ -233,13 +233,13 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
                     $ofs += ('A' === $c[2]) ? -1 : 1;
                     $ofs = ($numMatches + $ofs) % $numMatches;
                 }
-            } elseif (ord($c) < 32) {
+            } elseif (\ord($c) < 32) {
                 if ("\t" === $c || "\n" === $c) {
                     if ($numMatches > 0 && -1 !== $ofs) {
                         $ret = $matches[$ofs];
                         // Echo out remaining chars for current match
                         $output->write(substr($ret, $i));
-                        $i = strlen($ret);
+                        $i = \strlen($ret);
                     }
 
                     if ("\n" === $c) {
@@ -296,7 +296,7 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
      */
     private function getHiddenResponse(OutputInterface $output, $inputStream): string
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $exe = __DIR__.'/../Resources/bin/hiddeninput.exe';
 
             // handle code running from a phar
@@ -366,7 +366,7 @@ private function validateAttempts(callable $interviewer, OutputInterface $output
             }
 
             try {
-                return call_user_func($question->getValidator(), $interviewer());
+                return \call_user_func($question->getValidator(), $interviewer());
             } catch (RuntimeException $e) {
                 throw $e;
             } catch (\Exception $error) {
diff --git a/src/Symfony/Component/Console/Helper/SymfonyQuestionHelper.php b/src/Symfony/Component/Console/Helper/SymfonyQuestionHelper.php
index 79016b9f2d90..9697772072fa 100644
--- a/src/Symfony/Component/Console/Helper/SymfonyQuestionHelper.php
+++ b/src/Symfony/Component/Console/Helper/SymfonyQuestionHelper.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Console\Helper;
 
+use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Question\ChoiceQuestion;
 use Symfony\Component\Console\Question\ConfirmationQuestion;
 use Symfony\Component\Console\Question\Question;
 use Symfony\Component\Console\Style\SymfonyStyle;
-use Symfony\Component\Console\Formatter\OutputFormatter;
 
 /**
  * Symfony Style Guide compliant question helper.
diff --git a/src/Symfony/Component/Console/Helper/Table.php b/src/Symfony/Component/Console/Helper/Table.php
index 12ef96ebad1d..862a3329b7ee 100644
--- a/src/Symfony/Component/Console/Helper/Table.php
+++ b/src/Symfony/Component/Console/Helper/Table.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Console\Helper;
 
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
+use Symfony\Component\Console\Output\OutputInterface;
 
 /**
  * Provides helpers to display a table.
@@ -210,7 +210,7 @@ public function setColumnWidths(array $widths)
     public function setHeaders(array $headers)
     {
         $headers = array_values($headers);
-        if (!empty($headers) && !is_array($headers[0])) {
+        if (!empty($headers) && !\is_array($headers[0])) {
             $headers = array($headers);
         }
 
@@ -243,7 +243,7 @@ public function addRow($row)
             return $this;
         }
 
-        if (!is_array($row)) {
+        if (!\is_array($row)) {
             throw new InvalidArgumentException('A row must be an array or a TableSeparator instance.');
         }
 
@@ -368,7 +368,7 @@ private function renderCell(array $row, int $column, string $cellFormat)
 
         // str_pad won't work properly with multi-byte strings, we need to fix the padding
         if (false !== $encoding = mb_detect_encoding($cell, null, true)) {
-            $width += strlen($cell) - mb_strwidth($cell, $encoding);
+            $width += \strlen($cell) - mb_strwidth($cell, $encoding);
         }
 
         $style = $this->getColumnStyle($column);
@@ -407,7 +407,7 @@ private function calculateNumberOfColumns()
     private function buildTableRows($rows)
     {
         $unmergedRows = array();
-        for ($rowKey = 0; $rowKey < count($rows); ++$rowKey) {
+        for ($rowKey = 0; $rowKey < \count($rows); ++$rowKey) {
             $rows = $this->fillNextRows($rows, $rowKey);
 
             // Remove any new line breaks and replace it with a new line
@@ -449,15 +449,15 @@ private function fillNextRows(array $rows, int $line): array
     {
         $unmergedRows = array();
         foreach ($rows[$line] as $column => $cell) {
-            if (null !== $cell && !$cell instanceof TableCell && !is_scalar($cell) && !(is_object($cell) && method_exists($cell, '__toString'))) {
-                throw new InvalidArgumentException(sprintf('A cell must be a TableCell, a scalar or an object implementing __toString, %s given.', gettype($cell)));
+            if (null !== $cell && !$cell instanceof TableCell && !is_scalar($cell) && !(\is_object($cell) && method_exists($cell, '__toString'))) {
+                throw new InvalidArgumentException(sprintf('A cell must be a TableCell, a scalar or an object implementing __toString, %s given.', \gettype($cell)));
             }
             if ($cell instanceof TableCell && $cell->getRowspan() > 1) {
                 $nbLines = $cell->getRowspan() - 1;
                 $lines = array($cell);
                 if (strstr($cell, "\n")) {
                     $lines = explode("\n", str_replace("\n", "<fg=default;bg=default>\n</>", $cell));
-                    $nbLines = count($lines) > $nbLines ? substr_count($cell, "\n") : $nbLines;
+                    $nbLines = \count($lines) > $nbLines ? substr_count($cell, "\n") : $nbLines;
 
                     $rows[$line][$column] = new TableCell($lines[0], array('colspan' => $cell->getColspan()));
                     unset($lines[0]);
@@ -477,7 +477,7 @@ private function fillNextRows(array $rows, int $line): array
 
         foreach ($unmergedRows as $unmergedRowKey => $unmergedRow) {
             // we need to know if $unmergedRow will be merged or inserted into $rows
-            if (isset($rows[$unmergedRowKey]) && is_array($rows[$unmergedRowKey]) && ($this->getNumberOfColumns($rows[$unmergedRowKey]) + $this->getNumberOfColumns($unmergedRows[$unmergedRowKey]) <= $this->numberOfColumns)) {
+            if (isset($rows[$unmergedRowKey]) && \is_array($rows[$unmergedRowKey]) && ($this->getNumberOfColumns($rows[$unmergedRowKey]) + $this->getNumberOfColumns($unmergedRows[$unmergedRowKey]) <= $this->numberOfColumns)) {
                 foreach ($unmergedRow as $cellKey => $cell) {
                     // insert cell into row at cellKey position
                     array_splice($rows[$unmergedRowKey], $cellKey, 0, array($cell));
@@ -533,7 +533,7 @@ private function copyRow(array $rows, int $line): array
      */
     private function getNumberOfColumns(array $row): int
     {
-        $columns = count($row);
+        $columns = \count($row);
         foreach ($row as $column) {
             $columns += $column instanceof TableCell ? ($column->getColspan() - 1) : 0;
         }
@@ -585,13 +585,13 @@ private function calculateColumnsWidth(array $rows)
                 $lengths[] = $this->getCellWidth($row, $column);
             }
 
-            $this->effectiveColumnWidths[$column] = max($lengths) + strlen($this->style->getCellRowContentFormat()) - 2;
+            $this->effectiveColumnWidths[$column] = max($lengths) + \strlen($this->style->getCellRowContentFormat()) - 2;
         }
     }
 
     private function getColumnSeparatorWidth(): int
     {
-        return strlen(sprintf($this->style->getBorderFormat(), $this->style->getVerticalBorderChar()));
+        return \strlen(sprintf($this->style->getBorderFormat(), $this->style->getVerticalBorderChar()));
     }
 
     private function getCellWidth(array $row, int $column): int
diff --git a/src/Symfony/Component/Console/Helper/TableStyle.php b/src/Symfony/Component/Console/Helper/TableStyle.php
index 2999c76f86ad..117e311ebe95 100644
--- a/src/Symfony/Component/Console/Helper/TableStyle.php
+++ b/src/Symfony/Component/Console/Helper/TableStyle.php
@@ -237,7 +237,7 @@ public function getBorderFormat()
      */
     public function setPadType($padType)
     {
-        if (!in_array($padType, array(STR_PAD_LEFT, STR_PAD_RIGHT, STR_PAD_BOTH), true)) {
+        if (!\in_array($padType, array(STR_PAD_LEFT, STR_PAD_RIGHT, STR_PAD_BOTH), true)) {
             throw new InvalidArgumentException('Invalid padding type. Expected one of (STR_PAD_LEFT, STR_PAD_RIGHT, STR_PAD_BOTH).');
         }
 
diff --git a/src/Symfony/Component/Console/Input/ArgvInput.php b/src/Symfony/Component/Console/Input/ArgvInput.php
index 14276ba31711..da268677a69c 100644
--- a/src/Symfony/Component/Console/Input/ArgvInput.php
+++ b/src/Symfony/Component/Console/Input/ArgvInput.php
@@ -97,7 +97,7 @@ private function parseShortOption($token)
     {
         $name = substr($token, 1);
 
-        if (strlen($name) > 1) {
+        if (\strlen($name) > 1) {
             if ($this->definition->hasShortcut($name[0]) && $this->definition->getOptionForShortcut($name[0])->acceptValue()) {
                 // an option with a value (with no space)
                 $this->addShortOption($name[0], substr($name, 1));
@@ -118,7 +118,7 @@ private function parseShortOption($token)
      */
     private function parseShortOptionSet($name)
     {
-        $len = strlen($name);
+        $len = \strlen($name);
         for ($i = 0; $i < $len; ++$i) {
             if (!$this->definition->hasShortcut($name[$i])) {
                 throw new RuntimeException(sprintf('The "-%s" option does not exist.', $name[$i]));
@@ -145,7 +145,7 @@ private function parseLongOption($token)
         $name = substr($token, 2);
 
         if (false !== $pos = strpos($name, '=')) {
-            if (0 === strlen($value = substr($name, $pos + 1))) {
+            if (0 === \strlen($value = substr($name, $pos + 1))) {
                 array_unshift($this->parsed, $value);
             }
             $this->addLongOption(substr($name, 0, $pos), $value);
@@ -163,7 +163,7 @@ private function parseLongOption($token)
      */
     private function parseArgument($token)
     {
-        $c = count($this->arguments);
+        $c = \count($this->arguments);
 
         // if input is expecting another argument, add it
         if ($this->definition->hasArgument($c)) {
@@ -178,7 +178,7 @@ private function parseArgument($token)
         // unexpected argument
         } else {
             $all = $this->definition->getArguments();
-            if (count($all)) {
+            if (\count($all)) {
                 throw new RuntimeException(sprintf('Too many arguments, expected arguments "%s".', implode('" "', array_keys($all))));
             }
 
@@ -223,11 +223,11 @@ private function addLongOption($name, $value)
             throw new RuntimeException(sprintf('The "--%s" option does not accept a value.', $name));
         }
 
-        if (in_array($value, array('', null), true) && $option->acceptValue() && count($this->parsed)) {
+        if (\in_array($value, array('', null), true) && $option->acceptValue() && \count($this->parsed)) {
             // if option accepts an optional or mandatory argument
             // let's see if there is one provided
             $next = array_shift($this->parsed);
-            if ((isset($next[0]) && '-' !== $next[0]) || in_array($next, array('', null), true)) {
+            if ((isset($next[0]) && '-' !== $next[0]) || \in_array($next, array('', null), true)) {
                 $value = $next;
             } else {
                 array_unshift($this->parsed, $next);
@@ -298,7 +298,7 @@ public function getParameterOption($values, $default = false, $onlyParams = fals
         $values = (array) $values;
         $tokens = $this->tokens;
 
-        while (0 < count($tokens)) {
+        while (0 < \count($tokens)) {
             $token = array_shift($tokens);
             if ($onlyParams && '--' === $token) {
                 return $default;
@@ -313,7 +313,7 @@ public function getParameterOption($values, $default = false, $onlyParams = fals
                 //   For short options, test for '-o' at beginning
                 $leading = 0 === strpos($value, '--') ? $value.'=' : $value;
                 if ('' !== $leading && 0 === strpos($token, $leading)) {
-                    return substr($token, strlen($leading));
+                    return substr($token, \strlen($leading));
                 }
             }
         }
diff --git a/src/Symfony/Component/Console/Input/ArrayInput.php b/src/Symfony/Component/Console/Input/ArrayInput.php
index 595a8a0e8cbc..8b6917fc7c09 100644
--- a/src/Symfony/Component/Console/Input/ArrayInput.php
+++ b/src/Symfony/Component/Console/Input/ArrayInput.php
@@ -56,7 +56,7 @@ public function hasParameterOption($values, $onlyParams = false)
         $values = (array) $values;
 
         foreach ($this->parameters as $k => $v) {
-            if (!is_int($k)) {
+            if (!\is_int($k)) {
                 $v = $k;
             }
 
@@ -64,7 +64,7 @@ public function hasParameterOption($values, $onlyParams = false)
                 return false;
             }
 
-            if (in_array($v, $values)) {
+            if (\in_array($v, $values)) {
                 return true;
             }
         }
@@ -80,15 +80,15 @@ public function getParameterOption($values, $default = false, $onlyParams = fals
         $values = (array) $values;
 
         foreach ($this->parameters as $k => $v) {
-            if ($onlyParams && ('--' === $k || (is_int($k) && '--' === $v))) {
+            if ($onlyParams && ('--' === $k || (\is_int($k) && '--' === $v))) {
                 return $default;
             }
 
-            if (is_int($k)) {
-                if (in_array($v, $values)) {
+            if (\is_int($k)) {
+                if (\in_array($v, $values)) {
                     return true;
                 }
-            } elseif (in_array($k, $values)) {
+            } elseif (\in_array($k, $values)) {
                 return $v;
             }
         }
@@ -106,7 +106,7 @@ public function __toString()
         $params = array();
         foreach ($this->parameters as $param => $val) {
             if ($param && '-' === $param[0]) {
-                if (is_array($val)) {
+                if (\is_array($val)) {
                     foreach ($val as $v) {
                         $params[] = $param.('' != $v ? '='.$this->escapeToken($v) : '');
                     }
@@ -114,7 +114,7 @@ public function __toString()
                     $params[] = $param.('' != $val ? '='.$this->escapeToken($val) : '');
                 }
             } else {
-                $params[] = is_array($val) ? implode(' ', array_map(array($this, 'escapeToken'), $val)) : $this->escapeToken($val);
+                $params[] = \is_array($val) ? implode(' ', array_map(array($this, 'escapeToken'), $val)) : $this->escapeToken($val);
             }
         }
 
diff --git a/src/Symfony/Component/Console/Input/Input.php b/src/Symfony/Component/Console/Input/Input.php
index 41413252194f..fa5644d1fdba 100644
--- a/src/Symfony/Component/Console/Input/Input.php
+++ b/src/Symfony/Component/Console/Input/Input.php
@@ -72,7 +72,7 @@ public function validate()
             return !array_key_exists($argument, $givenArguments) && $definition->getArgument($argument)->isRequired();
         });
 
-        if (count($missingArguments) > 0) {
+        if (\count($missingArguments) > 0) {
             throw new RuntimeException(sprintf('Not enough arguments (missing: "%s").', implode(', ', $missingArguments)));
         }
     }
diff --git a/src/Symfony/Component/Console/Input/InputArgument.php b/src/Symfony/Component/Console/Input/InputArgument.php
index b5cbbaf1b476..409c4c4a922c 100644
--- a/src/Symfony/Component/Console/Input/InputArgument.php
+++ b/src/Symfony/Component/Console/Input/InputArgument.php
@@ -99,7 +99,7 @@ public function setDefault($default = null)
         if ($this->isArray()) {
             if (null === $default) {
                 $default = array();
-            } elseif (!is_array($default)) {
+            } elseif (!\is_array($default)) {
                 throw new LogicException('A default value for an array argument must be an array.');
             }
         }
diff --git a/src/Symfony/Component/Console/Input/InputDefinition.php b/src/Symfony/Component/Console/Input/InputDefinition.php
index d5b99ab3965e..940cbf3b9eca 100644
--- a/src/Symfony/Component/Console/Input/InputDefinition.php
+++ b/src/Symfony/Component/Console/Input/InputDefinition.php
@@ -135,7 +135,7 @@ public function getArgument($name)
             throw new InvalidArgumentException(sprintf('The "%s" argument does not exist.', $name));
         }
 
-        $arguments = is_int($name) ? array_values($this->arguments) : $this->arguments;
+        $arguments = \is_int($name) ? array_values($this->arguments) : $this->arguments;
 
         return $arguments[$name];
     }
@@ -149,7 +149,7 @@ public function getArgument($name)
      */
     public function hasArgument($name)
     {
-        $arguments = is_int($name) ? array_values($this->arguments) : $this->arguments;
+        $arguments = \is_int($name) ? array_values($this->arguments) : $this->arguments;
 
         return isset($arguments[$name]);
     }
@@ -171,7 +171,7 @@ public function getArguments()
      */
     public function getArgumentCount()
     {
-        return $this->hasAnArrayArgument ? PHP_INT_MAX : count($this->arguments);
+        return $this->hasAnArrayArgument ? PHP_INT_MAX : \count($this->arguments);
     }
 
     /**
@@ -378,7 +378,7 @@ public function getSynopsis($short = false)
             }
         }
 
-        if (count($elements) && $this->getArguments()) {
+        if (\count($elements) && $this->getArguments()) {
             $elements[] = '[--]';
         }
 
diff --git a/src/Symfony/Component/Console/Input/InputOption.php b/src/Symfony/Component/Console/Input/InputOption.php
index 184e369b86a5..a8dade4de745 100644
--- a/src/Symfony/Component/Console/Input/InputOption.php
+++ b/src/Symfony/Component/Console/Input/InputOption.php
@@ -56,7 +56,7 @@ public function __construct(string $name, $shortcut = null, int $mode = null, st
         }
 
         if (null !== $shortcut) {
-            if (is_array($shortcut)) {
+            if (\is_array($shortcut)) {
                 $shortcut = implode('|', $shortcut);
             }
             $shortcuts = preg_split('{(\|)-?}', ltrim($shortcut, '-'));
@@ -162,7 +162,7 @@ public function setDefault($default = null)
         if ($this->isArray()) {
             if (null === $default) {
                 $default = array();
-            } elseif (!is_array($default)) {
+            } elseif (!\is_array($default)) {
                 throw new LogicException('A default value for an array option must be an array.');
             }
         }
diff --git a/src/Symfony/Component/Console/Input/StringInput.php b/src/Symfony/Component/Console/Input/StringInput.php
index d1394ececa3e..61e29481a45b 100644
--- a/src/Symfony/Component/Console/Input/StringInput.php
+++ b/src/Symfony/Component/Console/Input/StringInput.php
@@ -49,14 +49,14 @@ public function __construct(string $input)
     private function tokenize($input)
     {
         $tokens = array();
-        $length = strlen($input);
+        $length = \strlen($input);
         $cursor = 0;
         while ($cursor < $length) {
             if (preg_match('/\s+/A', $input, $match, null, $cursor)) {
             } elseif (preg_match('/([^="\'\s]+?)(=?)('.self::REGEX_QUOTED_STRING.'+)/A', $input, $match, null, $cursor)) {
-                $tokens[] = $match[1].$match[2].stripcslashes(str_replace(array('"\'', '\'"', '\'\'', '""'), '', substr($match[3], 1, strlen($match[3]) - 2)));
+                $tokens[] = $match[1].$match[2].stripcslashes(str_replace(array('"\'', '\'"', '\'\'', '""'), '', substr($match[3], 1, \strlen($match[3]) - 2)));
             } elseif (preg_match('/'.self::REGEX_QUOTED_STRING.'/A', $input, $match, null, $cursor)) {
-                $tokens[] = stripcslashes(substr($match[0], 1, strlen($match[0]) - 2));
+                $tokens[] = stripcslashes(substr($match[0], 1, \strlen($match[0]) - 2));
             } elseif (preg_match('/'.self::REGEX_STRING.'/A', $input, $match, null, $cursor)) {
                 $tokens[] = stripcslashes($match[1]);
             } else {
@@ -64,7 +64,7 @@ private function tokenize($input)
                 throw new InvalidArgumentException(sprintf('Unable to parse input near "... %s ..."', substr($input, $cursor, 10)));
             }
 
-            $cursor += strlen($match[0]);
+            $cursor += \strlen($match[0]);
         }
 
         return $tokens;
diff --git a/src/Symfony/Component/Console/Logger/ConsoleLogger.php b/src/Symfony/Component/Console/Logger/ConsoleLogger.php
index 9f07e1fb03f4..0f7d551a6291 100644
--- a/src/Symfony/Component/Console/Logger/ConsoleLogger.php
+++ b/src/Symfony/Component/Console/Logger/ConsoleLogger.php
@@ -14,8 +14,8 @@
 use Psr\Log\AbstractLogger;
 use Psr\Log\InvalidArgumentException;
 use Psr\Log\LogLevel;
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 
 /**
  * PSR-3 compliant console logger.
diff --git a/src/Symfony/Component/Console/Output/ConsoleOutput.php b/src/Symfony/Component/Console/Output/ConsoleOutput.php
index cff6cd5a4a42..ad8a4b16825d 100644
--- a/src/Symfony/Component/Console/Output/ConsoleOutput.php
+++ b/src/Symfony/Component/Console/Output/ConsoleOutput.php
@@ -122,7 +122,7 @@ protected function hasStderrSupport()
     private function isRunningOS400()
     {
         $checks = array(
-            function_exists('php_uname') ? php_uname('s') : '',
+            \function_exists('php_uname') ? php_uname('s') : '',
             getenv('OSTYPE'),
             PHP_OS,
         );
diff --git a/src/Symfony/Component/Console/Output/Output.php b/src/Symfony/Component/Console/Output/Output.php
index 20635a5f730d..bb3204dff9c9 100644
--- a/src/Symfony/Component/Console/Output/Output.php
+++ b/src/Symfony/Component/Console/Output/Output.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Console\Output;
 
-use Symfony\Component\Console\Formatter\OutputFormatterInterface;
 use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Formatter\OutputFormatterInterface;
 
 /**
  * Base class for output classes.
diff --git a/src/Symfony/Component/Console/Output/StreamOutput.php b/src/Symfony/Component/Console/Output/StreamOutput.php
index d012a0a5c6eb..210ce007a6c1 100644
--- a/src/Symfony/Component/Console/Output/StreamOutput.php
+++ b/src/Symfony/Component/Console/Output/StreamOutput.php
@@ -42,7 +42,7 @@ class StreamOutput extends Output
      */
     public function __construct($stream, int $verbosity = self::VERBOSITY_NORMAL, bool $decorated = null, OutputFormatterInterface $formatter = null)
     {
-        if (!is_resource($stream) || 'stream' !== get_resource_type($stream)) {
+        if (!\is_resource($stream) || 'stream' !== get_resource_type($stream)) {
             throw new InvalidArgumentException('The StreamOutput class needs a stream as its first argument.');
         }
 
@@ -97,19 +97,19 @@ protected function hasColorSupport()
             return true;
         }
 
-        if (DIRECTORY_SEPARATOR === '\\') {
-            return (function_exists('sapi_windows_vt100_support')
+        if (\DIRECTORY_SEPARATOR === '\\') {
+            return (\function_exists('sapi_windows_vt100_support')
                 && @sapi_windows_vt100_support($this->stream))
                 || false !== getenv('ANSICON')
                 || 'ON' === getenv('ConEmuANSI')
                 || 'xterm' === getenv('TERM');
         }
 
-        if (function_exists('stream_isatty')) {
+        if (\function_exists('stream_isatty')) {
             return @stream_isatty($this->stream);
         }
 
-        if (function_exists('posix_isatty')) {
+        if (\function_exists('posix_isatty')) {
             return @posix_isatty($this->stream);
         }
 
diff --git a/src/Symfony/Component/Console/Question/ChoiceQuestion.php b/src/Symfony/Component/Console/Question/ChoiceQuestion.php
index b66f2c685bf1..4aa6f6726631 100644
--- a/src/Symfony/Component/Console/Question/ChoiceQuestion.php
+++ b/src/Symfony/Component/Console/Question/ChoiceQuestion.php
@@ -151,7 +151,7 @@ private function getDefaultValidator(): callable
                     }
                 }
 
-                if (count($results) > 1) {
+                if (\count($results) > 1) {
                     throw new InvalidArgumentException(sprintf('The provided answer is ambiguous. Value should be one of %s.', implode(' or ', $results)));
                 }
 
diff --git a/src/Symfony/Component/Console/Question/ConfirmationQuestion.php b/src/Symfony/Component/Console/Question/ConfirmationQuestion.php
index 7a15e5afb5ae..26eea6a136b7 100644
--- a/src/Symfony/Component/Console/Question/ConfirmationQuestion.php
+++ b/src/Symfony/Component/Console/Question/ConfirmationQuestion.php
@@ -44,7 +44,7 @@ private function getDefaultNormalizer()
         $regex = $this->trueAnswerRegex;
 
         return function ($answer) use ($default, $regex) {
-            if (is_bool($answer)) {
+            if (\is_bool($answer)) {
                 return $answer;
             }
 
diff --git a/src/Symfony/Component/Console/Question/Question.php b/src/Symfony/Component/Console/Question/Question.php
index 683998542cee..4e05758b5525 100644
--- a/src/Symfony/Component/Console/Question/Question.php
+++ b/src/Symfony/Component/Console/Question/Question.php
@@ -136,11 +136,11 @@ public function getAutocompleterValues()
      */
     public function setAutocompleterValues($values)
     {
-        if (is_array($values)) {
+        if (\is_array($values)) {
             $values = $this->isAssoc($values) ? array_merge(array_keys($values), array_values($values)) : array_values($values);
         }
 
-        if (null !== $values && !is_array($values) && !$values instanceof \Traversable) {
+        if (null !== $values && !\is_array($values) && !$values instanceof \Traversable) {
             throw new InvalidArgumentException('Autocompleter values can be either an array, `null` or a `Traversable` object.');
         }
 
@@ -241,6 +241,6 @@ public function getNormalizer()
 
     protected function isAssoc($array)
     {
-        return (bool) count(array_filter(array_keys($array), 'is_string'));
+        return (bool) \count(array_filter(array_keys($array), 'is_string'));
     }
 }
diff --git a/src/Symfony/Component/Console/Style/OutputStyle.php b/src/Symfony/Component/Console/Style/OutputStyle.php
index ad8864110e45..b1262b55de4e 100644
--- a/src/Symfony/Component/Console/Style/OutputStyle.php
+++ b/src/Symfony/Component/Console/Style/OutputStyle.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Console\Formatter\OutputFormatterInterface;
 use Symfony\Component\Console\Helper\ProgressBar;
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 
 /**
  * Decorates output to add console style guide helpers.
diff --git a/src/Symfony/Component/Console/Style/SymfonyStyle.php b/src/Symfony/Component/Console/Style/SymfonyStyle.php
index eec472371d9e..19f611a1aa02 100644
--- a/src/Symfony/Component/Console/Style/SymfonyStyle.php
+++ b/src/Symfony/Component/Console/Style/SymfonyStyle.php
@@ -46,7 +46,7 @@ public function __construct(InputInterface $input, OutputInterface $output)
         $this->bufferedOutput = new BufferedOutput($output->getVerbosity(), false, clone $output->getFormatter());
         // Windows cmd wraps lines as soon as the terminal width is reached, whether there are following chars or not.
         $width = (new Terminal())->getWidth() ?: self::MAX_LINE_LENGTH;
-        $this->lineLength = min($width - (int) (DIRECTORY_SEPARATOR === '\\'), self::MAX_LINE_LENGTH);
+        $this->lineLength = min($width - (int) (\DIRECTORY_SEPARATOR === '\\'), self::MAX_LINE_LENGTH);
 
         parent::__construct($output);
     }
@@ -63,7 +63,7 @@ public function __construct(InputInterface $input, OutputInterface $output)
      */
     public function block($messages, $type = null, $style = null, $prefix = ' ', $padding = false, $escape = true)
     {
-        $messages = is_array($messages) ? array_values($messages) : array($messages);
+        $messages = \is_array($messages) ? array_values($messages) : array($messages);
 
         $this->autoPrependBlock();
         $this->writeln($this->createBlock($messages, $type, $style, $prefix, $padding, $escape));
@@ -117,7 +117,7 @@ public function text($message)
     {
         $this->autoPrependText();
 
-        $messages = is_array($message) ? array_values($message) : array($message);
+        $messages = \is_array($message) ? array_values($message) : array($message);
         foreach ($messages as $message) {
             $this->writeln(sprintf(' %s', $message));
         }
@@ -269,7 +269,7 @@ public function createProgressBar($max = 0)
     {
         $progressBar = parent::createProgressBar($max);
 
-        if ('\\' !== DIRECTORY_SEPARATOR || 'Hyper' === getenv('TERM_PROGRAM')) {
+        if ('\\' !== \DIRECTORY_SEPARATOR || 'Hyper' === getenv('TERM_PROGRAM')) {
             $progressBar->setEmptyBarCharacter('░'); // light shade character \u2591
             $progressBar->setProgressCharacter('');
             $progressBar->setBarCharacter('▓'); // dark shade character \u2593
@@ -386,7 +386,7 @@ private function createBlock(iterable $messages, string $type = null, string $st
 
         if (null !== $type) {
             $type = sprintf('[%s] ', $type);
-            $indentLength = strlen($type);
+            $indentLength = \strlen($type);
             $lineIndentation = str_repeat(' ', $indentLength);
         }
 
@@ -398,7 +398,7 @@ private function createBlock(iterable $messages, string $type = null, string $st
 
             $lines = array_merge($lines, explode(PHP_EOL, wordwrap($message, $this->lineLength - $prefixLength - $indentLength, PHP_EOL, true)));
 
-            if (count($messages) > 1 && $key < count($messages) - 1) {
+            if (\count($messages) > 1 && $key < \count($messages) - 1) {
                 $lines[] = '';
             }
         }
diff --git a/src/Symfony/Component/Console/Terminal.php b/src/Symfony/Component/Console/Terminal.php
index 927dfc4d76d7..3930ca0cdc8e 100644
--- a/src/Symfony/Component/Console/Terminal.php
+++ b/src/Symfony/Component/Console/Terminal.php
@@ -56,7 +56,7 @@ public function getHeight()
 
     private static function initDimensions()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             if (preg_match('/^(\d+)x(\d+)(?: \((\d+)x(\d+)\))?$/', trim(getenv('ANSICON')), $matches)) {
                 // extract [w, H] from "wxh (WxH)"
                 // or [w, h] from "wxh"
@@ -87,7 +87,7 @@ private static function initDimensions()
      */
     private static function getConsoleMode()
     {
-        if (!function_exists('proc_open')) {
+        if (!\function_exists('proc_open')) {
             return;
         }
 
@@ -96,7 +96,7 @@ private static function getConsoleMode()
             2 => array('pipe', 'w'),
         );
         $process = proc_open('mode CON', $descriptorspec, $pipes, null, null, array('suppress_errors' => true));
-        if (is_resource($process)) {
+        if (\is_resource($process)) {
             $info = stream_get_contents($pipes[1]);
             fclose($pipes[1]);
             fclose($pipes[2]);
@@ -115,7 +115,7 @@ private static function getConsoleMode()
      */
     private static function getSttyColumns()
     {
-        if (!function_exists('proc_open')) {
+        if (!\function_exists('proc_open')) {
             return;
         }
 
@@ -125,7 +125,7 @@ private static function getSttyColumns()
         );
 
         $process = proc_open('stty -a | grep columns', $descriptorspec, $pipes, null, null, array('suppress_errors' => true));
-        if (is_resource($process)) {
+        if (\is_resource($process)) {
             $info = stream_get_contents($pipes[1]);
             fclose($pipes[1]);
             fclose($pipes[2]);
diff --git a/src/Symfony/Component/Console/Tester/CommandTester.php b/src/Symfony/Component/Console/Tester/CommandTester.php
index 39723b2613c5..131ca9b160e9 100644
--- a/src/Symfony/Component/Console/Tester/CommandTester.php
+++ b/src/Symfony/Component/Console/Tester/CommandTester.php
@@ -13,9 +13,9 @@
 
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Output\StreamOutput;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Output\StreamOutput;
 
 /**
  * Eases the testing of console commands.
diff --git a/src/Symfony/Component/Console/Tests/ApplicationTest.php b/src/Symfony/Component/Console/Tests/ApplicationTest.php
index e9432c522d6f..b01bdeb0f008 100644
--- a/src/Symfony/Component/Console/Tests/ApplicationTest.php
+++ b/src/Symfony/Component/Console/Tests/ApplicationTest.php
@@ -16,23 +16,23 @@
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\CommandLoader\FactoryCommandLoader;
 use Symfony\Component\Console\DependencyInjection\AddConsoleCommandPass;
-use Symfony\Component\Console\Helper\HelperSet;
+use Symfony\Component\Console\Event\ConsoleCommandEvent;
+use Symfony\Component\Console\Event\ConsoleErrorEvent;
+use Symfony\Component\Console\Event\ConsoleTerminateEvent;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
 use Symfony\Component\Console\Helper\FormatterHelper;
+use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Input\ArgvInput;
 use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputDefinition;
+use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\NullOutput;
 use Symfony\Component\Console\Output\Output;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\StreamOutput;
 use Symfony\Component\Console\Tester\ApplicationTester;
-use Symfony\Component\Console\Event\ConsoleCommandEvent;
-use Symfony\Component\Console\Event\ConsoleErrorEvent;
-use Symfony\Component\Console\Event\ConsoleTerminateEvent;
-use Symfony\Component\Console\Exception\CommandNotFoundException;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
diff --git a/src/Symfony/Component/Console/Tests/Command/CommandTest.php b/src/Symfony/Component/Console/Tests/Command/CommandTest.php
index 0e51632162a1..78e4d9061dc3 100644
--- a/src/Symfony/Component/Console/Tests/Command/CommandTest.php
+++ b/src/Symfony/Component/Console/Tests/Command/CommandTest.php
@@ -12,16 +12,16 @@
 namespace Symfony\Component\Console\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Helper\FormatterHelper;
-use Symfony\Component\Console\Application;
-use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputArgument;
-use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\StringInput;
-use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\NullOutput;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Tester\CommandTester;
 
 class CommandTest extends TestCase
@@ -340,7 +340,7 @@ public function testRunWithProcessTitle()
         $command->setApplication(new Application());
         $command->setProcessTitle('foo');
         $this->assertSame(0, $command->run(new StringInput(''), new NullOutput()));
-        if (function_exists('cli_set_process_title')) {
+        if (\function_exists('cli_set_process_title')) {
             if (null === @cli_get_process_title() && 'Darwin' === PHP_OS) {
                 $this->markTestSkipped('Running "cli_get_process_title" as an unprivileged user is not supported on MacOS.');
             }
diff --git a/src/Symfony/Component/Console/Tests/Command/HelpCommandTest.php b/src/Symfony/Component/Console/Tests/Command/HelpCommandTest.php
index 4d618ac16078..30fe2b6e7f8b 100644
--- a/src/Symfony/Component/Console/Tests/Command/HelpCommandTest.php
+++ b/src/Symfony/Component/Console/Tests/Command/HelpCommandTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Console\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Tester\CommandTester;
+use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Command\HelpCommand;
 use Symfony\Component\Console\Command\ListCommand;
-use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Tester\CommandTester;
 
 class HelpCommandTest extends TestCase
 {
diff --git a/src/Symfony/Component/Console/Tests/Command/ListCommandTest.php b/src/Symfony/Component/Console/Tests/Command/ListCommandTest.php
index 64478ecc0d21..b39f7ec5454e 100644
--- a/src/Symfony/Component/Console/Tests/Command/ListCommandTest.php
+++ b/src/Symfony/Component/Console/Tests/Command/ListCommandTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Console\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Tester\CommandTester;
 use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Tester\CommandTester;
 
 class ListCommandTest extends TestCase
 {
diff --git a/src/Symfony/Component/Console/Tests/EventListener/ErrorListenerTest.php b/src/Symfony/Component/Console/Tests/EventListener/ErrorListenerTest.php
index 3794a2660ab5..b3f3fb4546d8 100644
--- a/src/Symfony/Component/Console/Tests/EventListener/ErrorListenerTest.php
+++ b/src/Symfony/Component/Console/Tests/EventListener/ErrorListenerTest.php
@@ -20,8 +20,8 @@
 use Symfony\Component\Console\Input\ArgvInput;
 use Symfony\Component\Console\Input\ArrayInput;
 use Symfony\Component\Console\Input\Input;
-use Symfony\Component\Console\Input\StringInput;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\StringInput;
 use Symfony\Component\Console\Output\OutputInterface;
 
 class ErrorListenerTest extends TestCase
diff --git a/src/Symfony/Component/Console/Tests/Fixtures/Style/SymfonyStyle/command/command_8.php b/src/Symfony/Component/Console/Tests/Fixtures/Style/SymfonyStyle/command/command_8.php
index 922ef1f9d5c3..16b26b523f2d 100644
--- a/src/Symfony/Component/Console/Tests/Fixtures/Style/SymfonyStyle/command/command_8.php
+++ b/src/Symfony/Component/Console/Tests/Fixtures/Style/SymfonyStyle/command/command_8.php
@@ -1,9 +1,9 @@
 <?php
 
+use Symfony\Component\Console\Helper\TableCell;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
-use Symfony\Component\Console\Helper\TableCell;
 
 //Ensure formatting tables when using multiple headers with TableCell
 return function (InputInterface $input, OutputInterface $output) {
diff --git a/src/Symfony/Component/Console/Tests/Formatter/OutputFormatterStyleStackTest.php b/src/Symfony/Component/Console/Tests/Formatter/OutputFormatterStyleStackTest.php
index 6cd7c82b4a20..e212bf25ec4c 100644
--- a/src/Symfony/Component/Console/Tests/Formatter/OutputFormatterStyleStackTest.php
+++ b/src/Symfony/Component/Console/Tests/Formatter/OutputFormatterStyleStackTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Console\Tests\Formatter;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Formatter\OutputFormatterStyleStack;
 use Symfony\Component\Console\Formatter\OutputFormatterStyle;
+use Symfony\Component\Console\Formatter\OutputFormatterStyleStack;
 
 class OutputFormatterStyleStackTest extends TestCase
 {
diff --git a/src/Symfony/Component/Console/Tests/Helper/HelperSetTest.php b/src/Symfony/Component/Console/Tests/Helper/HelperSetTest.php
index aceef7041dc5..0fdb2cefbe42 100644
--- a/src/Symfony/Component/Console/Tests/Helper/HelperSetTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/HelperSetTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Console\Tests\Helper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Helper\HelperSet;
 
 class HelperSetTest extends TestCase
 {
diff --git a/src/Symfony/Component/Console/Tests/Helper/ProcessHelperTest.php b/src/Symfony/Component/Console/Tests/Helper/ProcessHelperTest.php
index eb619539ee92..382c9f4c1762 100644
--- a/src/Symfony/Component/Console/Tests/Helper/ProcessHelperTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/ProcessHelperTest.php
@@ -14,8 +14,8 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Helper\DebugFormatterHelper;
 use Symfony\Component\Console\Helper\HelperSet;
-use Symfony\Component\Console\Output\StreamOutput;
 use Symfony\Component\Console\Helper\ProcessHelper;
+use Symfony\Component\Console\Output\StreamOutput;
 use Symfony\Component\Process\Process;
 
 class ProcessHelperTest extends TestCase
diff --git a/src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php b/src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php
index aca64914a9e0..4c2de26a8638 100644
--- a/src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/ProgressBarTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Console\Tests\Helper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Helper\ProgressBar;
 use Symfony\Component\Console\Helper\Helper;
+use Symfony\Component\Console\Helper\ProgressBar;
 use Symfony\Component\Console\Output\StreamOutput;
 
 /**
diff --git a/src/Symfony/Component/Console/Tests/Helper/QuestionHelperTest.php b/src/Symfony/Component/Console/Tests/Helper/QuestionHelperTest.php
index ea5268cae3d6..67d6981c9450 100644
--- a/src/Symfony/Component/Console/Tests/Helper/QuestionHelperTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/QuestionHelperTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Console\Tests\Helper;
 
 use Symfony\Component\Console\Formatter\OutputFormatter;
-use Symfony\Component\Console\Helper\QuestionHelper;
-use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Helper\FormatterHelper;
+use Symfony\Component\Console\Helper\HelperSet;
+use Symfony\Component\Console\Helper\QuestionHelper;
 use Symfony\Component\Console\Output\StreamOutput;
 use Symfony\Component\Console\Question\ChoiceQuestion;
 use Symfony\Component\Console\Question\ConfirmationQuestion;
@@ -221,7 +221,7 @@ public function testAutocompleteWithTrailingBackslash()
 
     public function testAskHiddenResponse()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('This test is not supported on Windows');
         }
 
@@ -276,7 +276,7 @@ public function testAskAndValidate()
 
         $error = 'This is not a color!';
         $validator = function ($color) use ($error) {
-            if (!in_array($color, array('white', 'black'))) {
+            if (!\in_array($color, array('white', 'black'))) {
                 throw new \InvalidArgumentException($error);
             }
 
diff --git a/src/Symfony/Component/Console/Tests/Helper/SymfonyQuestionHelperTest.php b/src/Symfony/Component/Console/Tests/Helper/SymfonyQuestionHelperTest.php
index ce946e5b6259..fff72d4271b5 100644
--- a/src/Symfony/Component/Console/Tests/Helper/SymfonyQuestionHelperTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/SymfonyQuestionHelperTest.php
@@ -6,8 +6,8 @@
 use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Helper\SymfonyQuestionHelper;
 use Symfony\Component\Console\Output\StreamOutput;
-use Symfony\Component\Console\Question\Question;
 use Symfony\Component\Console\Question\ChoiceQuestion;
+use Symfony\Component\Console\Question\Question;
 
 /**
  * @group tty
diff --git a/src/Symfony/Component/Console/Tests/Helper/TableTest.php b/src/Symfony/Component/Console/Tests/Helper/TableTest.php
index b195e09acb8b..3f7c7efce80a 100644
--- a/src/Symfony/Component/Console/Tests/Helper/TableTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/TableTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Helper\Table;
-use Symfony\Component\Console\Helper\TableStyle;
-use Symfony\Component\Console\Helper\TableSeparator;
 use Symfony\Component\Console\Helper\TableCell;
+use Symfony\Component\Console\Helper\TableSeparator;
+use Symfony\Component\Console\Helper\TableStyle;
 use Symfony\Component\Console\Output\StreamOutput;
 
 class TableTest extends TestCase
diff --git a/src/Symfony/Component/Console/Tests/Input/ArgvInputTest.php b/src/Symfony/Component/Console/Tests/Input/ArgvInputTest.php
index 4cd7ab478f3a..75742409037f 100644
--- a/src/Symfony/Component/Console/Tests/Input/ArgvInputTest.php
+++ b/src/Symfony/Component/Console/Tests/Input/ArgvInputTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Input\ArgvInput;
-use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputOption;
 
 class ArgvInputTest extends TestCase
diff --git a/src/Symfony/Component/Console/Tests/Input/ArrayInputTest.php b/src/Symfony/Component/Console/Tests/Input/ArrayInputTest.php
index 34b67ac7f523..4bc83b3caffa 100644
--- a/src/Symfony/Component/Console/Tests/Input/ArrayInputTest.php
+++ b/src/Symfony/Component/Console/Tests/Input/ArrayInputTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputOption;
 
 class ArrayInputTest extends TestCase
diff --git a/src/Symfony/Component/Console/Tests/Input/InputDefinitionTest.php b/src/Symfony/Component/Console/Tests/Input/InputDefinitionTest.php
index 1374ddfdf863..d9ff5435b2a7 100644
--- a/src/Symfony/Component/Console/Tests/Input/InputDefinitionTest.php
+++ b/src/Symfony/Component/Console/Tests/Input/InputDefinitionTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Console\Tests\Input;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputOption;
 
 class InputDefinitionTest extends TestCase
diff --git a/src/Symfony/Component/Console/Tests/Input/InputTest.php b/src/Symfony/Component/Console/Tests/Input/InputTest.php
index 4410d2f5918f..7cf1d244a3e4 100644
--- a/src/Symfony/Component/Console/Tests/Input/InputTest.php
+++ b/src/Symfony/Component/Console/Tests/Input/InputTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputDefinition;
 use Symfony\Component\Console\Input\InputOption;
 
 class InputTest extends TestCase
diff --git a/src/Symfony/Component/Console/Tests/Logger/ConsoleLoggerTest.php b/src/Symfony/Component/Console/Tests/Logger/ConsoleLoggerTest.php
index 734a153e8ab5..95e78fc29f5a 100644
--- a/src/Symfony/Component/Console/Tests/Logger/ConsoleLoggerTest.php
+++ b/src/Symfony/Component/Console/Tests/Logger/ConsoleLoggerTest.php
@@ -16,8 +16,8 @@
 use Psr\Log\LogLevel;
 use Symfony\Component\Console\Logger\ConsoleLogger;
 use Symfony\Component\Console\Output\BufferedOutput;
-use Symfony\Component\Console\Tests\Fixtures\DummyOutput;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Tests\Fixtures\DummyOutput;
 
 /**
  * Console logger test.
diff --git a/src/Symfony/Component/Console/Tests/Output/OutputTest.php b/src/Symfony/Component/Console/Tests/Output/OutputTest.php
index d8330d0bd399..fbd4e8498908 100644
--- a/src/Symfony/Component/Console/Tests/Output/OutputTest.php
+++ b/src/Symfony/Component/Console/Tests/Output/OutputTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Console\Tests\Output;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Output\Output;
 use Symfony\Component\Console\Formatter\OutputFormatterStyle;
+use Symfony\Component\Console\Output\Output;
 
 class OutputTest extends TestCase
 {
diff --git a/src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php b/src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php
index 865bb33f7932..308030bbcf22 100644
--- a/src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php
+++ b/src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php
@@ -13,12 +13,12 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Command\Command;
-use Symfony\Component\Console\Tester\CommandTester;
 use Symfony\Component\Console\Formatter\OutputFormatter;
-use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Output\ConsoleOutputInterface;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\Console\Tester\CommandTester;
 
 class SymfonyStyleTest extends TestCase
 {
diff --git a/src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php b/src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php
index 8d86da4362af..58eb8103fcc9 100644
--- a/src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php
+++ b/src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php
@@ -14,12 +14,12 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Command\Command;
-use Symfony\Component\Console\Output\Output;
-use Symfony\Component\Console\Tester\CommandTester;
-use Symfony\Component\Console\Question\Question;
 use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Helper\QuestionHelper;
+use Symfony\Component\Console\Output\Output;
+use Symfony\Component\Console\Question\Question;
 use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\Console\Tester\CommandTester;
 
 class CommandTesterTest extends TestCase
 {
diff --git a/src/Symfony/Component/CssSelector/Node/AbstractNode.php b/src/Symfony/Component/CssSelector/Node/AbstractNode.php
index 123ef1b117a6..aac3f0a555dd 100644
--- a/src/Symfony/Component/CssSelector/Node/AbstractNode.php
+++ b/src/Symfony/Component/CssSelector/Node/AbstractNode.php
@@ -34,7 +34,7 @@ abstract class AbstractNode implements NodeInterface
     public function getNodeName(): string
     {
         if (null === $this->nodeName) {
-            $this->nodeName = preg_replace('~.*\\\\([^\\\\]+)Node$~', '$1', get_called_class());
+            $this->nodeName = preg_replace('~.*\\\\([^\\\\]+)Node$~', '$1', \get_called_class());
         }
 
         return $this->nodeName;
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php
index f40807cdfbf0..7ae9b438ca0a 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php
@@ -13,9 +13,9 @@
 
 use Symfony\Component\CssSelector\Parser\Reader;
 use Symfony\Component\CssSelector\Parser\Token;
-use Symfony\Component\CssSelector\Parser\TokenStream;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerEscaping;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
+use Symfony\Component\CssSelector\Parser\TokenStream;
 
 /**
  * CSS selector comment handler.
@@ -51,7 +51,7 @@ public function handle(Reader $reader, TokenStream $stream): bool
 
         $value = $this->escaping->escapeUnicode($match[1]);
         $stream->push(new Token(Token::TYPE_HASH, $value, $reader->getPosition()));
-        $reader->moveForward(strlen($match[0]));
+        $reader->moveForward(\strlen($match[0]));
 
         return true;
     }
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php
index 5ea0d5fd9935..7b2a14e2c33e 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php
@@ -13,9 +13,9 @@
 
 use Symfony\Component\CssSelector\Parser\Reader;
 use Symfony\Component\CssSelector\Parser\Token;
-use Symfony\Component\CssSelector\Parser\TokenStream;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerEscaping;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
+use Symfony\Component\CssSelector\Parser\TokenStream;
 
 /**
  * CSS selector comment handler.
@@ -51,7 +51,7 @@ public function handle(Reader $reader, TokenStream $stream): bool
 
         $value = $this->escaping->escapeUnicode($match[0]);
         $stream->push(new Token(Token::TYPE_IDENTIFIER, $value, $reader->getPosition()));
-        $reader->moveForward(strlen($match[0]));
+        $reader->moveForward(\strlen($match[0]));
 
         return true;
     }
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php
index 41e5844ea81e..8291a68d13d4 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\CssSelector\Parser\Reader;
 use Symfony\Component\CssSelector\Parser\Token;
-use Symfony\Component\CssSelector\Parser\TokenStream;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
+use Symfony\Component\CssSelector\Parser\TokenStream;
 
 /**
  * CSS selector comment handler.
@@ -47,7 +47,7 @@ public function handle(Reader $reader, TokenStream $stream): bool
         }
 
         $stream->push(new Token(Token::TYPE_NUMBER, $match[0], $reader->getPosition()));
-        $reader->moveForward(strlen($match[0]));
+        $reader->moveForward(\strlen($match[0]));
 
         return true;
     }
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php
index fe92c1fcc7da..eea1aa9b0c08 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php
@@ -15,9 +15,9 @@
 use Symfony\Component\CssSelector\Exception\SyntaxErrorException;
 use Symfony\Component\CssSelector\Parser\Reader;
 use Symfony\Component\CssSelector\Parser\Token;
-use Symfony\Component\CssSelector\Parser\TokenStream;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerEscaping;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
+use Symfony\Component\CssSelector\Parser\TokenStream;
 
 /**
  * CSS selector comment handler.
@@ -47,7 +47,7 @@ public function handle(Reader $reader, TokenStream $stream): bool
     {
         $quote = $reader->getSubstring(1);
 
-        if (!in_array($quote, array("'", '"'))) {
+        if (!\in_array($quote, array("'", '"'))) {
             return false;
         }
 
@@ -59,18 +59,18 @@ public function handle(Reader $reader, TokenStream $stream): bool
         }
 
         // check unclosed strings
-        if (strlen($match[0]) === $reader->getRemainingLength()) {
+        if (\strlen($match[0]) === $reader->getRemainingLength()) {
             throw SyntaxErrorException::unclosedString($reader->getPosition() - 1);
         }
 
         // check quotes pairs validity
-        if ($quote !== $reader->getSubstring(1, strlen($match[0]))) {
+        if ($quote !== $reader->getSubstring(1, \strlen($match[0]))) {
             throw SyntaxErrorException::unclosedString($reader->getPosition() - 1);
         }
 
         $string = $this->escaping->escapeUnicodeAndNewLine($match[0]);
         $stream->push(new Token(Token::TYPE_STRING, $string, $reader->getPosition()));
-        $reader->moveForward(strlen($match[0]) + 1);
+        $reader->moveForward(\strlen($match[0]) + 1);
 
         return true;
     }
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php
index ebf8a19fe260..21345e32c70d 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php
@@ -39,7 +39,7 @@ public function handle(Reader $reader, TokenStream $stream): bool
         }
 
         $stream->push(new Token(Token::TYPE_WHITESPACE, $match[0], $reader->getPosition()));
-        $reader->moveForward(strlen($match[0]));
+        $reader->moveForward(\strlen($match[0]));
 
         return true;
     }
diff --git a/src/Symfony/Component/CssSelector/Parser/Parser.php b/src/Symfony/Component/CssSelector/Parser/Parser.php
index dc84cc182619..d42bdca6046f 100644
--- a/src/Symfony/Component/CssSelector/Parser/Parser.php
+++ b/src/Symfony/Component/CssSelector/Parser/Parser.php
@@ -150,7 +150,7 @@ private function parseSimpleSelector(TokenStream $stream, bool $insideNegation =
     {
         $stream->skipWhitespace();
 
-        $selectorStart = count($stream->getUsed());
+        $selectorStart = \count($stream->getUsed());
         $result = $this->parseElementNode($stream);
         $pseudoElement = null;
 
@@ -187,7 +187,7 @@ private function parseSimpleSelector(TokenStream $stream, bool $insideNegation =
                 }
 
                 $identifier = $stream->getNextIdentifier();
-                if (in_array(strtolower($identifier), array('first-line', 'first-letter', 'before', 'after'))) {
+                if (\in_array(strtolower($identifier), array('first-line', 'first-letter', 'before', 'after'))) {
                     // Special case: CSS 2.1 pseudo-elements can have a single ':'.
                     // Any new pseudo-element must have two.
                     $pseudoElement = $identifier;
@@ -253,7 +253,7 @@ private function parseSimpleSelector(TokenStream $stream, bool $insideNegation =
             }
         }
 
-        if (count($stream->getUsed()) === $selectorStart) {
+        if (\count($stream->getUsed()) === $selectorStart) {
             throw SyntaxErrorException::unexpectedToken('selector', $stream->getPeek());
         }
 
diff --git a/src/Symfony/Component/CssSelector/Parser/Reader.php b/src/Symfony/Component/CssSelector/Parser/Reader.php
index adfd3c211394..4b43effed366 100644
--- a/src/Symfony/Component/CssSelector/Parser/Reader.php
+++ b/src/Symfony/Component/CssSelector/Parser/Reader.php
@@ -30,7 +30,7 @@ class Reader
     public function __construct(string $source)
     {
         $this->source = $source;
-        $this->length = strlen($source);
+        $this->length = \strlen($source);
     }
 
     public function isEOF(): bool
diff --git a/src/Symfony/Component/CssSelector/Parser/Token.php b/src/Symfony/Component/CssSelector/Parser/Token.php
index 554deb8e4aef..91a98f71542a 100644
--- a/src/Symfony/Component/CssSelector/Parser/Token.php
+++ b/src/Symfony/Component/CssSelector/Parser/Token.php
@@ -72,7 +72,7 @@ public function isDelimiter(array $values = array()): bool
             return true;
         }
 
-        return in_array($this->value, $values);
+        return \in_array($this->value, $values);
     }
 
     public function isWhitespace(): bool
diff --git a/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php b/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php
index 2df63f51621d..200272f23d2d 100644
--- a/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php
+++ b/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php
@@ -50,13 +50,13 @@ private function replaceUnicodeSequences(string $value): string
             $c = hexdec($match[1]);
 
             if (0x80 > $c %= 0x200000) {
-                return chr($c);
+                return \chr($c);
             }
             if (0x800 > $c) {
-                return chr(0xC0 | $c >> 6).chr(0x80 | $c & 0x3F);
+                return \chr(0xC0 | $c >> 6).\chr(0x80 | $c & 0x3F);
             }
             if (0x10000 > $c) {
-                return chr(0xE0 | $c >> 12).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
+                return \chr(0xE0 | $c >> 12).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
             }
         }, $value);
     }
diff --git a/src/Symfony/Component/CssSelector/Tests/Node/HashNodeTest.php b/src/Symfony/Component/CssSelector/Tests/Node/HashNodeTest.php
index 8554b226d6c7..3bc74da9459c 100644
--- a/src/Symfony/Component/CssSelector/Tests/Node/HashNodeTest.php
+++ b/src/Symfony/Component/CssSelector/Tests/Node/HashNodeTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\CssSelector\Tests\Node;
 
-use Symfony\Component\CssSelector\Node\HashNode;
 use Symfony\Component\CssSelector\Node\ElementNode;
+use Symfony\Component\CssSelector\Node\HashNode;
 
 class HashNodeTest extends AbstractNodeTest
 {
diff --git a/src/Symfony/Component/CssSelector/Tests/Node/NegationNodeTest.php b/src/Symfony/Component/CssSelector/Tests/Node/NegationNodeTest.php
index edf4552bac8b..ed4d2482c391 100644
--- a/src/Symfony/Component/CssSelector/Tests/Node/NegationNodeTest.php
+++ b/src/Symfony/Component/CssSelector/Tests/Node/NegationNodeTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\CssSelector\Tests\Node;
 
 use Symfony\Component\CssSelector\Node\ClassNode;
-use Symfony\Component\CssSelector\Node\NegationNode;
 use Symfony\Component\CssSelector\Node\ElementNode;
+use Symfony\Component\CssSelector\Node\NegationNode;
 
 class NegationNodeTest extends AbstractNodeTest
 {
diff --git a/src/Symfony/Component/CssSelector/Tests/Parser/Handler/AbstractHandlerTest.php b/src/Symfony/Component/CssSelector/Tests/Parser/Handler/AbstractHandlerTest.php
index 8005616a9208..f5c9dc8bfecb 100644
--- a/src/Symfony/Component/CssSelector/Tests/Parser/Handler/AbstractHandlerTest.php
+++ b/src/Symfony/Component/CssSelector/Tests/Parser/Handler/AbstractHandlerTest.php
@@ -63,7 +63,7 @@ protected function assertRemainingContent(Reader $reader, $remainingContent)
             $this->assertEquals(0, $reader->getRemainingLength());
             $this->assertTrue($reader->isEOF());
         } else {
-            $this->assertEquals(strlen($remainingContent), $reader->getRemainingLength());
+            $this->assertEquals(\strlen($remainingContent), $reader->getRemainingLength());
             $this->assertEquals(0, $reader->getOffset($remainingContent));
         }
     }
diff --git a/src/Symfony/Component/CssSelector/Tests/Parser/Handler/HashHandlerTest.php b/src/Symfony/Component/CssSelector/Tests/Parser/Handler/HashHandlerTest.php
index b7fa00a2255e..5730120bf74d 100644
--- a/src/Symfony/Component/CssSelector/Tests/Parser/Handler/HashHandlerTest.php
+++ b/src/Symfony/Component/CssSelector/Tests/Parser/Handler/HashHandlerTest.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\CssSelector\Parser\Handler\HashHandler;
 use Symfony\Component\CssSelector\Parser\Token;
-use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerEscaping;
+use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
 
 class HashHandlerTest extends AbstractHandlerTest
 {
diff --git a/src/Symfony/Component/CssSelector/Tests/Parser/Handler/IdentifierHandlerTest.php b/src/Symfony/Component/CssSelector/Tests/Parser/Handler/IdentifierHandlerTest.php
index 44d35749845a..f56430c7e83a 100644
--- a/src/Symfony/Component/CssSelector/Tests/Parser/Handler/IdentifierHandlerTest.php
+++ b/src/Symfony/Component/CssSelector/Tests/Parser/Handler/IdentifierHandlerTest.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\CssSelector\Parser\Handler\IdentifierHandler;
 use Symfony\Component\CssSelector\Parser\Token;
-use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerEscaping;
+use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
 
 class IdentifierHandlerTest extends AbstractHandlerTest
 {
diff --git a/src/Symfony/Component/CssSelector/Tests/Parser/Handler/StringHandlerTest.php b/src/Symfony/Component/CssSelector/Tests/Parser/Handler/StringHandlerTest.php
index 89eff8bd2825..8ea5d4d58776 100644
--- a/src/Symfony/Component/CssSelector/Tests/Parser/Handler/StringHandlerTest.php
+++ b/src/Symfony/Component/CssSelector/Tests/Parser/Handler/StringHandlerTest.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\CssSelector\Parser\Handler\StringHandler;
 use Symfony\Component\CssSelector\Parser\Token;
-use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
 use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerEscaping;
+use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
 
 class StringHandlerTest extends AbstractHandlerTest
 {
diff --git a/src/Symfony/Component/CssSelector/Tests/XPath/TranslatorTest.php b/src/Symfony/Component/CssSelector/Tests/XPath/TranslatorTest.php
index 519417835cef..610458297ece 100644
--- a/src/Symfony/Component/CssSelector/Tests/XPath/TranslatorTest.php
+++ b/src/Symfony/Component/CssSelector/Tests/XPath/TranslatorTest.php
@@ -37,9 +37,9 @@ public function testXmlLang($css, array $elementsId)
         $translator = new Translator();
         $document = new \SimpleXMLElement(file_get_contents(__DIR__.'/Fixtures/lang.xml'));
         $elements = $document->xpath($translator->cssToXPath($css));
-        $this->assertCount(count($elementsId), $elements);
+        $this->assertCount(\count($elementsId), $elements);
         foreach ($elements as $element) {
-            $this->assertTrue(in_array($element->attributes()->id, $elementsId));
+            $this->assertTrue(\in_array($element->attributes()->id, $elementsId));
         }
     }
 
@@ -54,10 +54,10 @@ public function testHtmlIds($css, array $elementsId)
         $document->loadHTMLFile(__DIR__.'/Fixtures/ids.html');
         $document = simplexml_import_dom($document);
         $elements = $document->xpath($translator->cssToXPath($css));
-        $this->assertCount(count($elementsId), $elementsId);
+        $this->assertCount(\count($elementsId), $elementsId);
         foreach ($elements as $element) {
             if (null !== $element->attributes()->id) {
-                $this->assertTrue(in_array($element->attributes()->id, $elementsId));
+                $this->assertTrue(\in_array($element->attributes()->id, $elementsId));
             }
         }
         libxml_clear_errors();
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php b/src/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php
index ee8976fdd03f..8a4d884212a1 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php
@@ -86,7 +86,7 @@ public function translateSuffixMatch(XPathExpr $xpath, string $attribute, ?strin
         return $xpath->addCondition($value ? sprintf(
             '%1$s and substring(%1$s, string-length(%1$s)-%2$s) = %3$s',
             $attribute,
-            strlen($value) - 1,
+            \strlen($value) - 1,
             Translator::getXpathLiteral($value)
         ) : '0');
     }
diff --git a/src/Symfony/Component/CssSelector/XPath/Translator.php b/src/Symfony/Component/CssSelector/XPath/Translator.php
index 73b548215d67..2b44e5fb8a6f 100644
--- a/src/Symfony/Component/CssSelector/XPath/Translator.php
+++ b/src/Symfony/Component/CssSelector/XPath/Translator.php
@@ -155,7 +155,7 @@ public function nodeToXPath(NodeInterface $node): XPathExpr
             throw new ExpressionErrorException(sprintf('Node "%s" not supported.', $node->getNodeName()));
         }
 
-        return call_user_func($this->nodeTranslators[$node->getNodeName()], $node, $this);
+        return \call_user_func($this->nodeTranslators[$node->getNodeName()], $node, $this);
     }
 
     /**
@@ -167,7 +167,7 @@ public function addCombination(string $combiner, NodeInterface $xpath, NodeInter
             throw new ExpressionErrorException(sprintf('Combiner "%s" not supported.', $combiner));
         }
 
-        return call_user_func($this->combinationTranslators[$combiner], $this->nodeToXPath($xpath), $this->nodeToXPath($combinedXpath));
+        return \call_user_func($this->combinationTranslators[$combiner], $this->nodeToXPath($xpath), $this->nodeToXPath($combinedXpath));
     }
 
     /**
@@ -179,7 +179,7 @@ public function addFunction(XPathExpr $xpath, FunctionNode $function): XPathExpr
             throw new ExpressionErrorException(sprintf('Function "%s" not supported.', $function->getName()));
         }
 
-        return call_user_func($this->functionTranslators[$function->getName()], $xpath, $function);
+        return \call_user_func($this->functionTranslators[$function->getName()], $xpath, $function);
     }
 
     /**
@@ -191,7 +191,7 @@ public function addPseudoClass(XPathExpr $xpath, string $pseudoClass): XPathExpr
             throw new ExpressionErrorException(sprintf('Pseudo-class "%s" not supported.', $pseudoClass));
         }
 
-        return call_user_func($this->pseudoClassTranslators[$pseudoClass], $xpath);
+        return \call_user_func($this->pseudoClassTranslators[$pseudoClass], $xpath);
     }
 
     /**
@@ -203,7 +203,7 @@ public function addAttributeMatching(XPathExpr $xpath, string $operator, string
             throw new ExpressionErrorException(sprintf('Attribute matcher operator "%s" not supported.', $operator));
         }
 
-        return call_user_func($this->attributeMatchingTranslators[$operator], $xpath, $attribute, $value);
+        return \call_user_func($this->attributeMatchingTranslators[$operator], $xpath, $attribute, $value);
     }
 
     /**
diff --git a/src/Symfony/Component/Debug/Debug.php b/src/Symfony/Component/Debug/Debug.php
index 921171041522..3f6570324ef9 100644
--- a/src/Symfony/Component/Debug/Debug.php
+++ b/src/Symfony/Component/Debug/Debug.php
@@ -42,7 +42,7 @@ public static function enable($errorReportingLevel = E_ALL, $displayErrors = tru
             error_reporting(E_ALL);
         }
 
-        if (!\in_array(PHP_SAPI, array('cli', 'phpdbg'), true)) {
+        if (!\in_array(\PHP_SAPI, array('cli', 'phpdbg'), true)) {
             ini_set('display_errors', 0);
             ExceptionHandler::register();
         } elseif ($displayErrors && (!ini_get('log_errors') || ini_get('error_log'))) {
diff --git a/src/Symfony/Component/Debug/DebugClassLoader.php b/src/Symfony/Component/Debug/DebugClassLoader.php
index f9c80d041bcf..ecf92516c3d7 100644
--- a/src/Symfony/Component/Debug/DebugClassLoader.php
+++ b/src/Symfony/Component/Debug/DebugClassLoader.php
@@ -39,11 +39,11 @@ class DebugClassLoader
     public function __construct(callable $classLoader)
     {
         $this->classLoader = $classLoader;
-        $this->isFinder = is_array($classLoader) && method_exists($classLoader[0], 'findFile');
+        $this->isFinder = \is_array($classLoader) && method_exists($classLoader[0], 'findFile');
 
         if (!isset(self::$caseCheck)) {
-            $file = file_exists(__FILE__) ? __FILE__ : rtrim(realpath('.'), DIRECTORY_SEPARATOR);
-            $i = strrpos($file, DIRECTORY_SEPARATOR);
+            $file = file_exists(__FILE__) ? __FILE__ : rtrim(realpath('.'), \DIRECTORY_SEPARATOR);
+            $i = strrpos($file, \DIRECTORY_SEPARATOR);
             $dir = substr($file, 0, 1 + $i);
             $file = substr($file, 1 + $i);
             $test = strtoupper($file) === $file ? strtolower($file) : strtoupper($file);
@@ -52,7 +52,7 @@ public function __construct(callable $classLoader)
             if (false === $test || false === $i) {
                 // filesystem is case sensitive
                 self::$caseCheck = 0;
-            } elseif (substr($test, -strlen($file)) === $file) {
+            } elseif (substr($test, -\strlen($file)) === $file) {
                 // filesystem is case insensitive and realpath() normalizes the case of characters
                 self::$caseCheck = 1;
             } elseif (false !== stripos(PHP_OS, 'darwin')) {
@@ -84,7 +84,7 @@ public static function enable()
         class_exists('Symfony\Component\Debug\ErrorHandler');
         class_exists('Psr\Log\LogLevel');
 
-        if (!is_array($functions = spl_autoload_functions())) {
+        if (!\is_array($functions = spl_autoload_functions())) {
             return;
         }
 
@@ -93,7 +93,7 @@ class_exists('Psr\Log\LogLevel');
         }
 
         foreach ($functions as $function) {
-            if (!is_array($function) || !$function[0] instanceof self) {
+            if (!\is_array($function) || !$function[0] instanceof self) {
                 $function = array(new static($function), 'loadClass');
             }
 
@@ -106,7 +106,7 @@ class_exists('Psr\Log\LogLevel');
      */
     public static function disable()
     {
-        if (!is_array($functions = spl_autoload_functions())) {
+        if (!\is_array($functions = spl_autoload_functions())) {
             return;
         }
 
@@ -115,7 +115,7 @@ public static function disable()
         }
 
         foreach ($functions as $function) {
-            if (is_array($function) && $function[0] instanceof self) {
+            if (\is_array($function) && $function[0] instanceof self) {
                 $function = $function[0]->getClassLoader();
             }
 
@@ -149,7 +149,7 @@ public function loadClass($class)
                     }
                 }
             } else {
-                call_user_func($this->classLoader, $class);
+                \call_user_func($this->classLoader, $class);
                 $file = false;
             }
         } finally {
@@ -289,10 +289,10 @@ private function checkClass($class, $file = null)
             }
             if (self::$caseCheck) {
                 $real = explode('\\', $class.strrchr($file, '.'));
-                $tail = explode(DIRECTORY_SEPARATOR, str_replace('/', DIRECTORY_SEPARATOR, $file));
+                $tail = explode(\DIRECTORY_SEPARATOR, str_replace('/', \DIRECTORY_SEPARATOR, $file));
 
-                $i = count($tail) - 1;
-                $j = count($real) - 1;
+                $i = \count($tail) - 1;
+                $j = \count($real) - 1;
 
                 while (isset($tail[$i], $real[$j]) && $tail[$i] === $real[$j]) {
                     --$i;
@@ -302,8 +302,8 @@ private function checkClass($class, $file = null)
                 array_splice($tail, 0, $i + 1);
             }
             if (self::$caseCheck && $tail) {
-                $tail = DIRECTORY_SEPARATOR.implode(DIRECTORY_SEPARATOR, $tail);
-                $tailLen = strlen($tail);
+                $tail = \DIRECTORY_SEPARATOR.implode(\DIRECTORY_SEPARATOR, $tail);
+                $tailLen = \strlen($tail);
                 $real = $refl->getFileName();
 
                 if (2 === self::$caseCheck) {
@@ -328,7 +328,7 @@ private function checkClass($class, $file = null)
 
                             $dir = $real;
                             $k = $kDir;
-                            $i = strlen($dir) - 1;
+                            $i = \strlen($dir) - 1;
                             while (!isset(self::$darwinCache[$k])) {
                                 self::$darwinCache[$k] = array($dir, array());
                                 self::$darwinCache[$dir] = &self::$darwinCache[$k];
diff --git a/src/Symfony/Component/Debug/ErrorHandler.php b/src/Symfony/Component/Debug/ErrorHandler.php
index 2702b4157f6d..caffd54166ac 100644
--- a/src/Symfony/Component/Debug/ErrorHandler.php
+++ b/src/Symfony/Component/Debug/ErrorHandler.php
@@ -11,16 +11,16 @@
 
 namespace Symfony\Component\Debug;
 
-use Psr\Log\LogLevel;
 use Psr\Log\LoggerInterface;
+use Psr\Log\LogLevel;
 use Symfony\Component\Debug\Exception\FatalErrorException;
 use Symfony\Component\Debug\Exception\FatalThrowableError;
 use Symfony\Component\Debug\Exception\OutOfMemoryException;
 use Symfony\Component\Debug\Exception\SilencedErrorContext;
-use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler;
-use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
 use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
 use Symfony\Component\Debug\FatalErrorHandler\FatalErrorHandlerInterface;
+use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler;
+use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
 
 /**
  * A generic ErrorHandler for the PHP engine.
@@ -127,17 +127,17 @@ public static function register(self $handler = null, $replace = true)
             $handler->isRoot = true;
         }
 
-        if ($handlerIsNew && is_array($prev) && $prev[0] instanceof self) {
+        if ($handlerIsNew && \is_array($prev) && $prev[0] instanceof self) {
             $handler = $prev[0];
             $replace = false;
         }
         if (!$replace && $prev) {
             restore_error_handler();
-            $handlerIsRegistered = is_array($prev) && $handler === $prev[0];
+            $handlerIsRegistered = \is_array($prev) && $handler === $prev[0];
         } else {
             $handlerIsRegistered = true;
         }
-        if (is_array($prev = set_exception_handler(array($handler, 'handleException'))) && $prev[0] instanceof self) {
+        if (\is_array($prev = set_exception_handler(array($handler, 'handleException'))) && $prev[0] instanceof self) {
             restore_exception_handler();
             if (!$handlerIsRegistered) {
                 $handler = $prev[0];
@@ -177,7 +177,7 @@ public function setDefaultLogger(LoggerInterface $logger, $levels = E_ALL, $repl
     {
         $loggers = array();
 
-        if (is_array($levels)) {
+        if (\is_array($levels)) {
             foreach ($levels as $type => $logLevel) {
                 if (empty($this->loggers[$type][0]) || $replace || $this->loggers[$type][0] === $this->bootstrappingLogger) {
                     $loggers[$type] = array($logger, $logLevel);
@@ -217,7 +217,7 @@ public function setLoggers(array $loggers)
             if (!isset($prev[$type])) {
                 throw new \InvalidArgumentException('Unknown error type: '.$type);
             }
-            if (!is_array($log)) {
+            if (!\is_array($log)) {
                 $log = array($log);
             } elseif (!array_key_exists(0, $log)) {
                 throw new \InvalidArgumentException('No logger provided');
@@ -350,7 +350,7 @@ private function reRegister($prev)
     {
         if ($prev !== $this->thrownErrors | $this->loggedErrors) {
             $handler = set_error_handler('var_dump');
-            $handler = is_array($handler) ? $handler[0] : null;
+            $handler = \is_array($handler) ? $handler[0] : null;
             restore_error_handler();
             if ($handler === $this) {
                 restore_error_handler();
@@ -393,7 +393,7 @@ public function handleError($type, $message, $file, $line)
         }
         $scope = $this->scopedErrors & $type;
 
-        if (4 < $numArgs = func_num_args()) {
+        if (4 < $numArgs = \func_num_args()) {
             $context = $scope ? (func_get_arg(4) ?: array()) : array();
         } else {
             $context = array();
@@ -583,7 +583,7 @@ public static function handleFatalError(array $error = null)
         $previousHandler = null;
         $sameHandlerLimit = 10;
 
-        while (!is_array($handler) || !$handler[0] instanceof self) {
+        while (!\is_array($handler) || !$handler[0] instanceof self) {
             $handler = set_exception_handler('var_dump');
             restore_exception_handler();
 
@@ -667,7 +667,7 @@ private function cleanTrace($backtrace, $type, $file, $line, $throw)
 
         for ($i = 0; isset($backtrace[$i]); ++$i) {
             if (isset($backtrace[$i]['file'], $backtrace[$i]['line']) && $backtrace[$i]['line'] === $line && $backtrace[$i]['file'] === $file) {
-                $lightTrace = array_slice($lightTrace, 1 + $i);
+                $lightTrace = \array_slice($lightTrace, 1 + $i);
                 break;
             }
         }
diff --git a/src/Symfony/Component/Debug/Exception/FatalErrorException.php b/src/Symfony/Component/Debug/Exception/FatalErrorException.php
index c6c52a93d586..8305d39218b2 100644
--- a/src/Symfony/Component/Debug/Exception/FatalErrorException.php
+++ b/src/Symfony/Component/Debug/Exception/FatalErrorException.php
@@ -31,7 +31,7 @@ public function __construct(string $message, int $code, int $severity, string $f
 
             $this->setTrace($trace);
         } elseif (null !== $traceOffset) {
-            if (function_exists('xdebug_get_function_stack')) {
+            if (\function_exists('xdebug_get_function_stack')) {
                 $trace = xdebug_get_function_stack();
                 if (0 < $traceOffset) {
                     array_splice($trace, -$traceOffset);
diff --git a/src/Symfony/Component/Debug/Exception/FlattenException.php b/src/Symfony/Component/Debug/Exception/FlattenException.php
index f491bf2ac4c9..f76cf23f3377 100644
--- a/src/Symfony/Component/Debug/Exception/FlattenException.php
+++ b/src/Symfony/Component/Debug/Exception/FlattenException.php
@@ -53,7 +53,7 @@ public static function create(\Exception $exception, $statusCode = null, array $
         $e->setStatusCode($statusCode);
         $e->setHeaders($headers);
         $e->setTraceFromException($exception);
-        $e->setClass(get_class($exception));
+        $e->setClass(\get_class($exception));
         $e->setFile($exception->getFile());
         $e->setLine($exception->getLine());
 
@@ -228,9 +228,9 @@ private function flattenArgs($args, $level = 0, &$count = 0)
             if ($value instanceof \__PHP_Incomplete_Class) {
                 // is_object() returns false on PHP<=7.1
                 $result[$key] = array('incomplete-object', $this->getClassNameFromIncomplete($value));
-            } elseif (is_object($value)) {
-                $result[$key] = array('object', get_class($value));
-            } elseif (is_array($value)) {
+            } elseif (\is_object($value)) {
+                $result[$key] = array('object', \get_class($value));
+            } elseif (\is_array($value)) {
                 if ($level > 10) {
                     $result[$key] = array('array', '*DEEP NESTED ARRAY*');
                 } else {
@@ -238,13 +238,13 @@ private function flattenArgs($args, $level = 0, &$count = 0)
                 }
             } elseif (null === $value) {
                 $result[$key] = array('null', null);
-            } elseif (is_bool($value)) {
+            } elseif (\is_bool($value)) {
                 $result[$key] = array('boolean', $value);
-            } elseif (is_int($value)) {
+            } elseif (\is_int($value)) {
                 $result[$key] = array('integer', $value);
-            } elseif (is_float($value)) {
+            } elseif (\is_float($value)) {
                 $result[$key] = array('float', $value);
-            } elseif (is_resource($value)) {
+            } elseif (\is_resource($value)) {
                 $result[$key] = array('resource', get_resource_type($value));
             } else {
                 $result[$key] = array('string', (string) $value);
diff --git a/src/Symfony/Component/Debug/ExceptionHandler.php b/src/Symfony/Component/Debug/ExceptionHandler.php
index 0e3ec0071795..1845bc88c365 100644
--- a/src/Symfony/Component/Debug/ExceptionHandler.php
+++ b/src/Symfony/Component/Debug/ExceptionHandler.php
@@ -57,7 +57,7 @@ public static function register($debug = true, $charset = null, $fileLinkFormat
         $handler = new static($debug, $charset, $fileLinkFormat);
 
         $prev = set_exception_handler(array($handler, 'handle'));
-        if (is_array($prev) && $prev[0] instanceof ErrorHandler) {
+        if (\is_array($prev) && $prev[0] instanceof ErrorHandler) {
             restore_exception_handler();
             $prev[0]->setExceptionHandler(array($handler, 'handle'));
         }
@@ -142,7 +142,7 @@ public function handle(\Exception $exception)
         $this->caughtBuffer = null;
 
         try {
-            call_user_func($this->handler, $exception);
+            \call_user_func($this->handler, $exception);
             $this->caughtLength = $caughtLength;
         } catch (\Exception $e) {
             if (!$caughtLength) {
@@ -218,7 +218,7 @@ public function getContent(FlattenException $exception)
 
         $content = '';
         try {
-            $count = count($exception->getAllPrevious());
+            $count = \count($exception->getAllPrevious());
             $total = $count + 1;
             foreach ($exception->toArray() as $position => $e) {
                 $ind = $count - $position + 1;
@@ -253,7 +253,7 @@ public function getContent(FlattenException $exception)
         } catch (\Exception $e) {
             // something nasty happened and we cannot throw an exception anymore
             if ($this->debug) {
-                $title = sprintf('Exception thrown when handling an exception (%s: %s)', get_class($e), $this->escapeHtml($e->getMessage()));
+                $title = sprintf('Exception thrown when handling an exception (%s: %s)', \get_class($e), $this->escapeHtml($e->getMessage()));
             } else {
                 $title = 'Whoops, looks like something went wrong.';
             }
@@ -376,12 +376,12 @@ private function formatPath($path, $line)
         }
 
         if (\is_string($fmt)) {
-            $i = strpos($f = $fmt, '&', max(strrpos($f, '%f'), strrpos($f, '%l'))) ?: strlen($f);
+            $i = strpos($f = $fmt, '&', max(strrpos($f, '%f'), strrpos($f, '%l'))) ?: \strlen($f);
             $fmt = array(substr($f, 0, $i)) + preg_split('/&([^>]++)>/', substr($f, $i), -1, PREG_SPLIT_DELIM_CAPTURE);
 
             for ($i = 1; isset($fmt[$i]); ++$i) {
                 if (0 === strpos($path, $k = $fmt[$i++])) {
-                    $path = substr_replace($path, $fmt[$i], 0, strlen($k));
+                    $path = substr_replace($path, $fmt[$i], 0, \strlen($k));
                     break;
                 }
             }
@@ -408,7 +408,7 @@ private function formatArgs(array $args)
             if ('object' === $item[0]) {
                 $formattedValue = sprintf('<em>object</em>(%s)', $this->formatClass($item[1]));
             } elseif ('array' === $item[0]) {
-                $formattedValue = sprintf('<em>array</em>(%s)', is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
+                $formattedValue = sprintf('<em>array</em>(%s)', \is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
             } elseif ('null' === $item[0]) {
                 $formattedValue = '<em>null</em>';
             } elseif ('boolean' === $item[0]) {
@@ -419,7 +419,7 @@ private function formatArgs(array $args)
                 $formattedValue = str_replace("\n", '', $this->escapeHtml(var_export($item[1], true)));
             }
 
-            $result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", $this->escapeHtml($key), $formattedValue);
+            $result[] = \is_int($key) ? $formattedValue : sprintf("'%s' => %s", $this->escapeHtml($key), $formattedValue);
         }
 
         return implode(', ', $result);
diff --git a/src/Symfony/Component/Debug/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php b/src/Symfony/Component/Debug/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
index 25030e5606d2..4ccd16fe309d 100644
--- a/src/Symfony/Component/Debug/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
+++ b/src/Symfony/Component/Debug/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Debug\FatalErrorHandler;
 
-use Symfony\Component\Debug\Exception\ClassNotFoundException;
-use Symfony\Component\Debug\Exception\FatalErrorException;
-use Symfony\Component\Debug\DebugClassLoader;
 use Composer\Autoload\ClassLoader as ComposerClassLoader;
 use Symfony\Component\ClassLoader\ClassLoader as SymfonyClassLoader;
+use Symfony\Component\Debug\DebugClassLoader;
+use Symfony\Component\Debug\Exception\ClassNotFoundException;
+use Symfony\Component\Debug\Exception\FatalErrorException;
 
 /**
  * ErrorHandler for classes that do not exist.
@@ -29,9 +29,9 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
      */
     public function handleError(array $error, FatalErrorException $exception)
     {
-        $messageLen = strlen($error['message']);
+        $messageLen = \strlen($error['message']);
         $notFoundSuffix = '\' not found';
-        $notFoundSuffixLen = strlen($notFoundSuffix);
+        $notFoundSuffixLen = \strlen($notFoundSuffix);
         if ($notFoundSuffixLen > $messageLen) {
             return;
         }
@@ -42,7 +42,7 @@ public function handleError(array $error, FatalErrorException $exception)
 
         foreach (array('class', 'interface', 'trait') as $typeName) {
             $prefix = ucfirst($typeName).' \'';
-            $prefixLen = strlen($prefix);
+            $prefixLen = \strlen($prefix);
             if (0 !== strpos($error['message'], $prefix)) {
                 continue;
             }
@@ -85,7 +85,7 @@ public function handleError(array $error, FatalErrorException $exception)
      */
     private function getClassCandidates(string $class): array
     {
-        if (!is_array($functions = spl_autoload_functions())) {
+        if (!\is_array($functions = spl_autoload_functions())) {
             return array();
         }
 
@@ -93,14 +93,14 @@ private function getClassCandidates(string $class): array
         $classes = array();
 
         foreach ($functions as $function) {
-            if (!is_array($function)) {
+            if (!\is_array($function)) {
                 continue;
             }
             // get class loaders wrapped by DebugClassLoader
             if ($function[0] instanceof DebugClassLoader) {
                 $function = $function[0]->getClassLoader();
 
-                if (!is_array($function)) {
+                if (!\is_array($function)) {
                     continue;
                 }
             }
@@ -126,7 +126,7 @@ private function getClassCandidates(string $class): array
 
     private function findClassInPath(string $path, string $class, string $prefix): array
     {
-        if (!$path = realpath($path.'/'.strtr($prefix, '\\_', '//')) ?: realpath($path.'/'.dirname(strtr($prefix, '\\_', '//'))) ?: realpath($path)) {
+        if (!$path = realpath($path.'/'.strtr($prefix, '\\_', '//')) ?: realpath($path.'/'.\dirname(strtr($prefix, '\\_', '//'))) ?: realpath($path)) {
             return array();
         }
 
@@ -145,7 +145,7 @@ private function convertFileToClass(string $path, string $file, string $prefix):
     {
         $candidates = array(
             // namespaced class
-            $namespacedClass = str_replace(array($path.DIRECTORY_SEPARATOR, '.php', '/'), array('', '', '\\'), $file),
+            $namespacedClass = str_replace(array($path.\DIRECTORY_SEPARATOR, '.php', '/'), array('', '', '\\'), $file),
             // namespaced class (with target dir)
             $prefix.$namespacedClass,
             // namespaced class (with target dir and separator)
diff --git a/src/Symfony/Component/Debug/FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php b/src/Symfony/Component/Debug/FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php
index c6f391a79c68..db2418037748 100644
--- a/src/Symfony/Component/Debug/FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php
+++ b/src/Symfony/Component/Debug/FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Debug\FatalErrorHandler;
 
-use Symfony\Component\Debug\Exception\UndefinedFunctionException;
 use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\Exception\UndefinedFunctionException;
 
 /**
  * ErrorHandler for undefined functions.
@@ -26,9 +26,9 @@ class UndefinedFunctionFatalErrorHandler implements FatalErrorHandlerInterface
      */
     public function handleError(array $error, FatalErrorException $exception)
     {
-        $messageLen = strlen($error['message']);
+        $messageLen = \strlen($error['message']);
         $notFoundSuffix = '()';
-        $notFoundSuffixLen = strlen($notFoundSuffix);
+        $notFoundSuffixLen = \strlen($notFoundSuffix);
         if ($notFoundSuffixLen > $messageLen) {
             return;
         }
@@ -38,7 +38,7 @@ public function handleError(array $error, FatalErrorException $exception)
         }
 
         $prefix = 'Call to undefined function ';
-        $prefixLen = strlen($prefix);
+        $prefixLen = \strlen($prefix);
         if (0 !== strpos($error['message'], $prefix)) {
             return;
         }
diff --git a/src/Symfony/Component/Debug/FatalErrorHandler/UndefinedMethodFatalErrorHandler.php b/src/Symfony/Component/Debug/FatalErrorHandler/UndefinedMethodFatalErrorHandler.php
index 6fa62b6f24fb..618a2c208b71 100644
--- a/src/Symfony/Component/Debug/FatalErrorHandler/UndefinedMethodFatalErrorHandler.php
+++ b/src/Symfony/Component/Debug/FatalErrorHandler/UndefinedMethodFatalErrorHandler.php
@@ -44,7 +44,7 @@ public function handleError(array $error, FatalErrorException $exception)
         $candidates = array();
         foreach ($methods as $definedMethodName) {
             $lev = levenshtein($methodName, $definedMethodName);
-            if ($lev <= strlen($methodName) / 3 || false !== strpos($definedMethodName, $methodName)) {
+            if ($lev <= \strlen($methodName) / 3 || false !== strpos($definedMethodName, $methodName)) {
                 $candidates[] = $definedMethodName;
             }
         }
diff --git a/src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php b/src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
index eee8e9dc5753..15e476381abd 100644
--- a/src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
+++ b/src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
@@ -480,7 +480,7 @@ public function testHandleErrorException()
 
         $handler = new ErrorHandler();
         $handler->setExceptionHandler(function () use (&$args) {
-            $args = func_get_args();
+            $args = \func_get_args();
         });
 
         $handler->handleException($exception);
diff --git a/src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php b/src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php
index 5c781dbf42da..b89e5b0833d3 100644
--- a/src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php
+++ b/src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php
@@ -14,19 +14,19 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
-use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
-use Symfony\Component\HttpKernel\Exception\NotAcceptableHttpException;
 use Symfony\Component\HttpKernel\Exception\ConflictHttpException;
-use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\HttpKernel\Exception\GoneHttpException;
 use Symfony\Component\HttpKernel\Exception\LengthRequiredHttpException;
+use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
+use Symfony\Component\HttpKernel\Exception\NotAcceptableHttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpKernel\Exception\PreconditionFailedHttpException;
 use Symfony\Component\HttpKernel\Exception\PreconditionRequiredHttpException;
 use Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException;
 use Symfony\Component\HttpKernel\Exception\TooManyRequestsHttpException;
+use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
 use Symfony\Component\HttpKernel\Exception\UnsupportedMediaTypeHttpException;
 
 class FlattenExceptionTest extends TestCase
diff --git a/src/Symfony/Component/Debug/Tests/ExceptionHandlerTest.php b/src/Symfony/Component/Debug/Tests/ExceptionHandlerTest.php
index 0285eff1346c..6ff6a74f4f99 100644
--- a/src/Symfony/Component/Debug/Tests/ExceptionHandlerTest.php
+++ b/src/Symfony/Component/Debug/Tests/ExceptionHandlerTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Debug\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Debug\ExceptionHandler;
 use Symfony\Component\Debug\Exception\OutOfMemoryException;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\Debug\ExceptionHandler;
 use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
 require_once __DIR__.'/HeaderMock.php';
 
diff --git a/src/Symfony/Component/Debug/Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php b/src/Symfony/Component/Debug/Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php
index 65c80fc1cf34..5cdac2f12afc 100644
--- a/src/Symfony/Component/Debug/Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php
+++ b/src/Symfony/Component/Debug/Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php
@@ -11,18 +11,18 @@
 
 namespace Symfony\Component\Debug\Tests\FatalErrorHandler;
 
+use Composer\Autoload\ClassLoader as ComposerClassLoader;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Debug\DebugClassLoader;
 use Symfony\Component\Debug\Exception\FatalErrorException;
 use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
-use Symfony\Component\Debug\DebugClassLoader;
-use Composer\Autoload\ClassLoader as ComposerClassLoader;
 
 class ClassNotFoundFatalErrorHandlerTest extends TestCase
 {
     public static function setUpBeforeClass()
     {
         foreach (spl_autoload_functions() as $function) {
-            if (!is_array($function)) {
+            if (!\is_array($function)) {
                 continue;
             }
 
@@ -32,7 +32,7 @@ public static function setUpBeforeClass()
             }
 
             if ($function[0] instanceof ComposerClassLoader) {
-                $function[0]->add('Symfony_Component_Debug_Tests_Fixtures', dirname(dirname(dirname(dirname(dirname(__DIR__))))));
+                $function[0]->add('Symfony_Component_Debug_Tests_Fixtures', \dirname(\dirname(\dirname(\dirname(\dirname(__DIR__))))));
                 break;
             }
         }
diff --git a/src/Symfony/Component/Debug/Tests/HeaderMock.php b/src/Symfony/Component/Debug/Tests/HeaderMock.php
index 65d0b588558b..3d8d84c5a4c4 100644
--- a/src/Symfony/Component/Debug/Tests/HeaderMock.php
+++ b/src/Symfony/Component/Debug/Tests/HeaderMock.php
@@ -27,12 +27,12 @@ function testHeader()
 {
     static $headers = array();
 
-    if (!$h = func_get_args()) {
+    if (!$h = \func_get_args()) {
         $h = $headers;
         $headers = array();
 
         return $h;
     }
 
-    $headers[] = func_get_args();
+    $headers[] = \func_get_args();
 }
diff --git a/src/Symfony/Component/Debug/Tests/phpt/debug_class_loader.phpt b/src/Symfony/Component/Debug/Tests/phpt/debug_class_loader.phpt
index 685280bc8a18..41c56c93090d 100644
--- a/src/Symfony/Component/Debug/Tests/phpt/debug_class_loader.phpt
+++ b/src/Symfony/Component/Debug/Tests/phpt/debug_class_loader.phpt
@@ -9,7 +9,7 @@ use Symfony\Component\Debug\DebugClassLoader;
 
 $vendor = __DIR__;
 while (!file_exists($vendor.'/vendor')) {
-    $vendor = dirname($vendor);
+    $vendor = \dirname($vendor);
 }
 require $vendor.'/vendor/autoload.php';
 
diff --git a/src/Symfony/Component/Debug/Tests/phpt/decorate_exception_hander.phpt b/src/Symfony/Component/Debug/Tests/phpt/decorate_exception_hander.phpt
index 7ce7b9dc6f7d..74cf2e917100 100644
--- a/src/Symfony/Component/Debug/Tests/phpt/decorate_exception_hander.phpt
+++ b/src/Symfony/Component/Debug/Tests/phpt/decorate_exception_hander.phpt
@@ -7,7 +7,7 @@ namespace Symfony\Component\Debug;
 
 $vendor = __DIR__;
 while (!file_exists($vendor.'/vendor')) {
-    $vendor = dirname($vendor);
+    $vendor = \dirname($vendor);
 }
 require $vendor.'/vendor/autoload.php';
 
diff --git a/src/Symfony/Component/Debug/Tests/phpt/exception_rethrown.phpt b/src/Symfony/Component/Debug/Tests/phpt/exception_rethrown.phpt
index 9df0a65cf79f..3f4559543064 100644
--- a/src/Symfony/Component/Debug/Tests/phpt/exception_rethrown.phpt
+++ b/src/Symfony/Component/Debug/Tests/phpt/exception_rethrown.phpt
@@ -7,7 +7,7 @@ namespace Symfony\Component\Debug;
 
 $vendor = __DIR__;
 while (!file_exists($vendor.'/vendor')) {
-    $vendor = dirname($vendor);
+    $vendor = \dirname($vendor);
 }
 require $vendor.'/vendor/autoload.php';
 
diff --git a/src/Symfony/Component/Debug/Tests/phpt/fatal_with_nested_handlers.phpt b/src/Symfony/Component/Debug/Tests/phpt/fatal_with_nested_handlers.phpt
index 5c5245c069e6..2b74e5c6857f 100644
--- a/src/Symfony/Component/Debug/Tests/phpt/fatal_with_nested_handlers.phpt
+++ b/src/Symfony/Component/Debug/Tests/phpt/fatal_with_nested_handlers.phpt
@@ -7,7 +7,7 @@ namespace Symfony\Component\Debug;
 
 $vendor = __DIR__;
 while (!file_exists($vendor.'/vendor')) {
-    $vendor = dirname($vendor);
+    $vendor = \dirname($vendor);
 }
 require $vendor.'/vendor/autoload.php';
 
diff --git a/src/Symfony/Component/DependencyInjection/Alias.php b/src/Symfony/Component/DependencyInjection/Alias.php
index 55e385f674e4..24484de167e8 100644
--- a/src/Symfony/Component/DependencyInjection/Alias.php
+++ b/src/Symfony/Component/DependencyInjection/Alias.php
@@ -21,7 +21,7 @@ public function __construct(string $id, bool $public = true)
     {
         $this->id = $id;
         $this->public = $public;
-        $this->private = 2 > func_num_args();
+        $this->private = 2 > \func_num_args();
     }
 
     /**
diff --git a/src/Symfony/Component/DependencyInjection/Argument/IteratorArgument.php b/src/Symfony/Component/DependencyInjection/Argument/IteratorArgument.php
index ab3a87900ad8..2d796d2d8f99 100644
--- a/src/Symfony/Component/DependencyInjection/Argument/IteratorArgument.php
+++ b/src/Symfony/Component/DependencyInjection/Argument/IteratorArgument.php
@@ -46,7 +46,7 @@ public function setValues(array $values)
     {
         foreach ($values as $k => $v) {
             if (null !== $v && !$v instanceof Reference) {
-                throw new InvalidArgumentException(sprintf('An IteratorArgument must hold only Reference instances, "%s" given.', is_object($v) ? get_class($v) : gettype($v)));
+                throw new InvalidArgumentException(sprintf('An IteratorArgument must hold only Reference instances, "%s" given.', \is_object($v) ? \get_class($v) : \gettype($v)));
             }
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Argument/RewindableGenerator.php b/src/Symfony/Component/DependencyInjection/Argument/RewindableGenerator.php
index e162a7c34dec..f8f771d627ac 100644
--- a/src/Symfony/Component/DependencyInjection/Argument/RewindableGenerator.php
+++ b/src/Symfony/Component/DependencyInjection/Argument/RewindableGenerator.php
@@ -38,7 +38,7 @@ public function getIterator()
 
     public function count()
     {
-        if (is_callable($count = $this->count)) {
+        if (\is_callable($count = $this->count)) {
             $this->count = $count();
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/ChildDefinition.php b/src/Symfony/Component/DependencyInjection/ChildDefinition.php
index 0f67e960dffc..095beaec72d8 100644
--- a/src/Symfony/Component/DependencyInjection/ChildDefinition.php
+++ b/src/Symfony/Component/DependencyInjection/ChildDefinition.php
@@ -95,7 +95,7 @@ public function getArgument($index)
      */
     public function replaceArgument($index, $value)
     {
-        if (is_int($index)) {
+        if (\is_int($index)) {
             $this->arguments['index_'.$index] = $value;
         } elseif (0 === strpos($index, '$')) {
             $this->arguments[$index] = $value;
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/AbstractRecursivePass.php b/src/Symfony/Component/DependencyInjection/Compiler/AbstractRecursivePass.php
index 901dc06ffaee..cff09d57d4ad 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/AbstractRecursivePass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/AbstractRecursivePass.php
@@ -90,8 +90,8 @@ protected function processValue($value, $isRoot = false)
      */
     protected function getConstructor(Definition $definition, $required)
     {
-        if (is_string($factory = $definition->getFactory())) {
-            if (!function_exists($factory)) {
+        if (\is_string($factory = $definition->getFactory())) {
+            if (!\function_exists($factory)) {
                 throw new RuntimeException(sprintf('Invalid service "%s": function "%s" does not exist.', $this->currentId, $factory));
             }
             $r = new \ReflectionFunction($factory);
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/AnalyzeServiceReferencesPass.php b/src/Symfony/Component/DependencyInjection/Compiler/AnalyzeServiceReferencesPass.php
index a67d9b044f4f..22976bbb1269 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/AnalyzeServiceReferencesPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/AnalyzeServiceReferencesPass.php
@@ -12,12 +12,12 @@
 namespace Symfony\Component\DependencyInjection\Compiler;
 
 use Symfony\Component\DependencyInjection\Argument\ArgumentInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\ExpressionLanguage;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\ExpressionLanguage\Expression;
 
 /**
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php b/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
index 605d36079b19..f737c77df3f3 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
@@ -366,7 +366,7 @@ private function getAliasesSuggestionForType($type, $extraContext = null)
         }
 
         $extraContext = $extraContext ? ' '.$extraContext : '';
-        if (1 < $len = count($aliases)) {
+        if (1 < $len = \count($aliases)) {
             $message = sprintf('Try changing the type-hint%s to one of its parents: ', $extraContext);
             for ($i = 0, --$len; $i < $len; ++$i) {
                 $message .= sprintf('%s "%s", ', class_exists($aliases[$i], false) ? 'class' : 'interface', $aliases[$i]);
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckArgumentsValidityPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckArgumentsValidityPass.php
index 6e5e9042c8c2..e76e94005ff5 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckArgumentsValidityPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckArgumentsValidityPass.php
@@ -41,7 +41,7 @@ protected function processValue($value, $isRoot = false)
         $i = 0;
         foreach ($value->getArguments() as $k => $v) {
             if ($k !== $i++) {
-                if (!is_int($k)) {
+                if (!\is_int($k)) {
                     $msg = sprintf('Invalid constructor argument for service "%s": integer expected but found string "%s". Check your service definition.', $this->currentId, $k);
                     $value->addError($msg);
                     if ($this->throwExceptions) {
@@ -63,7 +63,7 @@ protected function processValue($value, $isRoot = false)
             $i = 0;
             foreach ($methodCall[1] as $k => $v) {
                 if ($k !== $i++) {
-                    if (!is_int($k)) {
+                    if (!\is_int($k)) {
                         $msg = sprintf('Invalid argument for method call "%s" of service "%s": integer expected but found string "%s". Check your service definition.', $methodCall[0], $this->currentId, $k);
                         $value->addError($msg);
                         if ($this->throwExceptions) {
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckCircularReferencesPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckCircularReferencesPass.php
index 6191893e0356..ac7866b2bab8 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckCircularReferencesPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckCircularReferencesPass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
 
 /**
  * Checks your services for circular references.
@@ -64,7 +64,7 @@ private function checkOutEdges(array $edges)
                     $this->currentPath[] = $id;
 
                     if (false !== $searchKey) {
-                        throw new ServiceCircularReferenceException($id, array_slice($this->currentPath, $searchKey));
+                        throw new ServiceCircularReferenceException($id, \array_slice($this->currentPath, $searchKey));
                     }
 
                     $this->checkOutEdges($node->getOutEdges());
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php
index ba6356f4aceb..7cf4f4a6e2f5 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php
@@ -48,6 +48,15 @@ public function process(ContainerBuilder $container)
                     throw new RuntimeException(sprintf('Please add the class to service "%s" even if it is constructed by a factory since we might need to add method calls based on compile-time checks.', $id));
                 }
                 if (class_exists($id) || interface_exists($id, false)) {
+                    if (0 === strpos($id, '\\') && 1 < substr_count($id, '\\')) {
+                        throw new RuntimeException(sprintf(
+                            'The definition for "%s" has no class attribute, and appears to reference a class or interface. '
+                            .'Please specify the class attribute explicitly or remove the leading backslash by renaming '
+                            .'the service to "%s" to get rid of this error.',
+                            $id, substr($id, 1)
+                        ));
+                    }
+
                     throw new RuntimeException(sprintf(
                          'The definition for "%s" has no class attribute, and appears to reference a '
                         .'class or interface in the global namespace. Leaving out the "class" attribute '
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
index d33c376df1d9..77b35f1866a9 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 use Symfony\Component\DependencyInjection\Reference;
 
 /**
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php b/src/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php
index 72c7dd165d4a..323dc6f28783 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\DependencyInjection\Compiler;
 
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Checks the validity of references.
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/Compiler.php b/src/Symfony/Component/DependencyInjection/Compiler/Compiler.php
index 7c797a92b3d5..b102e706414d 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/Compiler.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/Compiler.php
@@ -69,10 +69,10 @@ public function addPass(CompilerPassInterface $pass, $type = PassConfig::TYPE_BE
     public function log(CompilerPassInterface $pass, string $message)
     {
         if (false !== strpos($message, "\n")) {
-            $message = str_replace("\n", "\n".get_class($pass).': ', trim($message));
+            $message = str_replace("\n", "\n".\get_class($pass).': ', trim($message));
         }
 
-        $this->log[] = get_class($pass).': '.$message;
+        $this->log[] = \get_class($pass).': '.$message;
     }
 
     /**
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php b/src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php
index f36293c6cff2..39731f46b614 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Alias;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * Overwrites a service but keeps the overridden one.
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/InlineServiceDefinitionsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/InlineServiceDefinitionsPass.php
index 9aee66c8e0d5..4a0d9f24d3ff 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/InlineServiceDefinitionsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/InlineServiceDefinitionsPass.php
@@ -70,7 +70,7 @@ protected function processValue($value, $isRoot = false)
             $ids = array_keys($this->cloningIds);
             $ids[] = $id;
 
-            throw new ServiceCircularReferenceException($id, array_slice($ids, array_search($id, $ids)));
+            throw new ServiceCircularReferenceException($id, \array_slice($ids, array_search($id, $ids)));
         }
 
         $this->cloningIds[$id] = true;
@@ -116,11 +116,11 @@ private function isInlineableDefinition($id, Definition $definition, ServiceRefe
             $ids[] = $edge->getSourceNode()->getId();
         }
 
-        if (count(array_unique($ids)) > 1) {
+        if (\count(array_unique($ids)) > 1) {
             return false;
         }
 
-        if (count($ids) > 1 && is_array($factory = $definition->getFactory()) && ($factory[0] instanceof Reference || $factory[0] instanceof Definition)) {
+        if (\count($ids) > 1 && \is_array($factory = $definition->getFactory()) && ($factory[0] instanceof Reference || $factory[0] instanceof Definition)) {
             return false;
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php b/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php
index e077529b5918..cdd4e3f549f7 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php
@@ -147,7 +147,7 @@ public function __construct(ExtensionInterface $extension, ParameterBagInterface
     {
         parent::__construct($parameterBag);
 
-        $this->extensionClass = get_class($extension);
+        $this->extensionClass = \get_class($extension);
     }
 
     /**
@@ -155,7 +155,7 @@ public function __construct(ExtensionInterface $extension, ParameterBagInterface
      */
     public function addCompilerPass(CompilerPassInterface $pass, $type = PassConfig::TYPE_BEFORE_OPTIMIZATION, int $priority = 0)
     {
-        throw new LogicException(sprintf('You cannot add compiler pass "%s" from extension "%s". Compiler passes must be registered before the container is compiled.', get_class($pass), $this->extensionClass));
+        throw new LogicException(sprintf('You cannot add compiler pass "%s" from extension "%s". Compiler passes must be registered before the container is compiled.', \get_class($pass), $this->extensionClass));
     }
 
     /**
@@ -163,7 +163,7 @@ public function addCompilerPass(CompilerPassInterface $pass, $type = PassConfig:
      */
     public function registerExtension(ExtensionInterface $extension)
     {
-        throw new LogicException(sprintf('You cannot register extension "%s" from "%s". Extensions must be registered before the container is compiled.', get_class($extension), $this->extensionClass));
+        throw new LogicException(sprintf('You cannot register extension "%s" from "%s". Extensions must be registered before the container is compiled.', \get_class($extension), $this->extensionClass));
     }
 
     /**
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php b/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
index 3a930134799c..b6c2a7cfcc1d 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
@@ -257,13 +257,13 @@ public function setRemovingPasses(array $passes)
      */
     private function sortPasses(array $passes)
     {
-        if (0 === count($passes)) {
+        if (0 === \count($passes)) {
             return array();
         }
 
         krsort($passes);
 
         // Flatten the array
-        return call_user_func_array('array_merge', $passes);
+        return \call_user_func_array('array_merge', $passes);
     }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/PriorityTaggedServiceTrait.php b/src/Symfony/Component/DependencyInjection/Compiler/PriorityTaggedServiceTrait.php
index 97b083fa13c3..ed9b0b7f1e94 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/PriorityTaggedServiceTrait.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/PriorityTaggedServiceTrait.php
@@ -47,7 +47,7 @@ private function findAndSortTaggedServices($tagName, ContainerBuilder $container
 
         if ($services) {
             krsort($services);
-            $services = call_user_func_array('array_merge', $services);
+            $services = \call_user_func_array('array_merge', $services);
         }
 
         return $services;
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/RegisterEnvVarProcessorsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/RegisterEnvVarProcessorsPass.php
index b99c252fef8d..e206b0ced887 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/RegisterEnvVarProcessorsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/RegisterEnvVarProcessorsPass.php
@@ -17,8 +17,8 @@
 use Symfony\Component\DependencyInjection\EnvVarProcessorInterface;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag;
-use Symfony\Component\DependencyInjection\ServiceLocator;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ServiceLocator;
 
 /**
  * Creates the container.env_var_processors_locator service.
@@ -68,7 +68,7 @@ private static function validateProvidedTypes($types, $class)
         $types = explode('|', $types);
 
         foreach ($types as $type) {
-            if (!in_array($type, self::$allowedTypes)) {
+            if (!\in_array($type, self::$allowedTypes)) {
                 throw new InvalidArgumentException(sprintf('Invalid type "%s" returned by "%s::getProvidedTypes()", expected one of "%s".', $type, $class, implode('", "', self::$allowedTypes)));
             }
         }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/RegisterServiceSubscribersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/RegisterServiceSubscribersPass.php
index 572eabb7d99e..276e65ef508d 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/RegisterServiceSubscribersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/RegisterServiceSubscribersPass.php
@@ -68,14 +68,14 @@ protected function processValue($value, $isRoot = false)
         $declaringClass = (new \ReflectionMethod($class, 'getSubscribedServices'))->class;
 
         foreach ($class::getSubscribedServices() as $key => $type) {
-            if (!is_string($type) || !preg_match('/^\??[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+(?:\\\\[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+)*+$/', $type)) {
-                throw new InvalidArgumentException(sprintf('"%s::getSubscribedServices()" must return valid PHP types for service "%s" key "%s", "%s" returned.', $class, $this->currentId, $key, is_string($type) ? $type : gettype($type)));
+            if (!\is_string($type) || !preg_match('/^\??[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+(?:\\\\[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+)*+$/', $type)) {
+                throw new InvalidArgumentException(sprintf('"%s::getSubscribedServices()" must return valid PHP types for service "%s" key "%s", "%s" returned.', $class, $this->currentId, $key, \is_string($type) ? $type : \gettype($type)));
             }
             if ($optionalBehavior = '?' === $type[0]) {
                 $type = substr($type, 1);
                 $optionalBehavior = ContainerInterface::IGNORE_ON_INVALID_REFERENCE;
             }
-            if (is_int($key)) {
+            if (\is_int($key)) {
                 $key = $type;
             }
             if (!isset($serviceMap[$key])) {
@@ -90,7 +90,7 @@ protected function processValue($value, $isRoot = false)
         }
 
         if ($serviceMap = array_keys($serviceMap)) {
-            $message = sprintf(1 < count($serviceMap) ? 'keys "%s" do' : 'key "%s" does', str_replace('%', '%%', implode('", "', $serviceMap)));
+            $message = sprintf(1 < \count($serviceMap) ? 'keys "%s" do' : 'key "%s" does', str_replace('%', '%%', implode('", "', $serviceMap)));
             throw new InvalidArgumentException(sprintf('Service %s not exist in the map returned by "%s::getSubscribedServices()" for service "%s".', $message, $class, $this->currentId));
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/RemoveUnusedDefinitionsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/RemoveUnusedDefinitionsPass.php
index ec2eed27edbc..bd26fdbd2303 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/RemoveUnusedDefinitionsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/RemoveUnusedDefinitionsPass.php
@@ -58,19 +58,19 @@ public function process(ContainerBuilder $container)
                         $referencingAliases[] = $node->getValue();
                     }
                 }
-                $isReferenced = (count(array_unique($sourceIds)) - count($referencingAliases)) > 0;
+                $isReferenced = (\count(array_unique($sourceIds)) - \count($referencingAliases)) > 0;
             } else {
                 $referencingAliases = array();
                 $isReferenced = false;
             }
 
-            if (1 === count($referencingAliases) && false === $isReferenced) {
+            if (1 === \count($referencingAliases) && false === $isReferenced) {
                 $container->setDefinition((string) reset($referencingAliases), $definition);
                 $definition->setPublic(!$definition->isPrivate());
                 $definition->setPrivate(reset($referencingAliases)->isPrivate());
                 $container->removeDefinition($id);
                 $container->log($this, sprintf('Removed service "%s"; reason: replaces alias %s.', $id, reset($referencingAliases)));
-            } elseif (0 === count($referencingAliases) && false === $isReferenced) {
+            } elseif (0 === \count($referencingAliases) && false === $isReferenced) {
                 $container->removeDefinition($id);
                 $container->resolveEnvPlaceholders(serialize($definition));
                 $container->log($this, sprintf('Removed service "%s"; reason: unused.', $id));
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveBindingsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveBindingsPass.php
index 0051fb5ac3df..a63b6def4198 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveBindingsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveBindingsPass.php
@@ -17,8 +17,8 @@
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\LazyProxy\ProxyHelper;
-use Symfony\Component\DependencyInjection\TypedReference;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\TypedReference;
 
 /**
  * @author Guilhem Niot <guilhem.niot@gmail.com>
@@ -88,7 +88,7 @@ protected function processValue($value, $isRoot = false)
             }
 
             if (null !== $bindingValue && !$bindingValue instanceof Reference && !$bindingValue instanceof Definition) {
-                throw new InvalidArgumentException(sprintf('Invalid value for binding key "%s" for service "%s": expected null, an instance of %s or an instance of %s, %s given.', $key, $this->currentId, Reference::class, Definition::class, gettype($bindingValue)));
+                throw new InvalidArgumentException(sprintf('Invalid value for binding key "%s" for service "%s": expected null, an instance of %s or an instance of %s, %s given.', $key, $this->currentId, Reference::class, Definition::class, \gettype($bindingValue)));
             }
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveChildDefinitionsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveChildDefinitionsPass.php
index 660385b88e5c..5913c6e4e466 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveChildDefinitionsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveChildDefinitionsPass.php
@@ -147,7 +147,7 @@ private function doResolveDefinition(ChildDefinition $definition)
             if (is_numeric($k)) {
                 $def->addArgument($v);
             } elseif (0 === strpos($k, 'index_')) {
-                $def->replaceArgument((int) substr($k, strlen('index_')), $v);
+                $def->replaceArgument((int) substr($k, \strlen('index_')), $v);
             } else {
                 $def->setArgument($k, $v);
             }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveClassPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveClassPass.php
index 0235e5abb8e3..5932472ec68a 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveClassPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveClassPass.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ChildDefinition;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 
 /**
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveEnvPlaceholdersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveEnvPlaceholdersPass.php
index f42107c6f7fd..9e1edd4d3156 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveEnvPlaceholdersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveEnvPlaceholdersPass.php
@@ -20,7 +20,7 @@ class ResolveEnvPlaceholdersPass extends AbstractRecursivePass
 {
     protected function processValue($value, $isRoot = false)
     {
-        if (is_string($value)) {
+        if (\is_string($value)) {
             return $this->container->resolveEnvPlaceholders($value, true);
         }
         if ($value instanceof Definition) {
@@ -35,7 +35,7 @@ protected function processValue($value, $isRoot = false)
 
         $value = parent::processValue($value, $isRoot);
 
-        if ($value && is_array($value) && !$isRoot) {
+        if ($value && \is_array($value) && !$isRoot) {
             $value = array_combine($this->container->resolveEnvPlaceholders(array_keys($value), true), $value);
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveFactoryClassPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveFactoryClassPass.php
index c41cf973fe62..848da7f2bd24 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveFactoryClassPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveFactoryClassPass.php
@@ -24,7 +24,7 @@ class ResolveFactoryClassPass extends AbstractRecursivePass
      */
     protected function processValue($value, $isRoot = false)
     {
-        if ($value instanceof Definition && is_array($factory = $value->getFactory()) && null === $factory[0]) {
+        if ($value instanceof Definition && \is_array($factory = $value->getFactory()) && null === $factory[0]) {
             if (null === $class = $value->getClass()) {
                 throw new RuntimeException(sprintf('The "%s" service is defined to be created by a factory, but is missing the factory class. Did you forget to define the factory or service class?', $this->currentId));
             }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveInstanceofConditionalsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveInstanceofConditionalsPass.php
index e02f61a8f4ec..20507cfb5698 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveInstanceofConditionalsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveInstanceofConditionalsPass.php
@@ -14,8 +14,8 @@
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**
  * Applies instanceof conditionals to definitions.
@@ -105,11 +105,11 @@ private function processDefinition(ContainerBuilder $container, $id, Definition
                 $definition->setShared($shared);
             }
 
-            $i = count($instanceofTags);
+            $i = \count($instanceofTags);
             while (0 <= --$i) {
                 foreach ($instanceofTags[$i] as $k => $v) {
                     foreach ($v as $v) {
-                        if ($definition->hasTag($k) && in_array($v, $definition->getTag($k))) {
+                        if ($definition->hasTag($k) && \in_array($v, $definition->getTag($k))) {
                             continue;
                         }
                         $definition->addTag($k, $v);
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveInvalidReferencesPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveInvalidReferencesPass.php
index d60272b27655..f1a1475aeb4a 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveInvalidReferencesPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveInvalidReferencesPass.php
@@ -13,11 +13,11 @@
 
 use Symfony\Component\DependencyInjection\Argument\ArgumentInterface;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Emulates the invalid behavior if the reference is not found within the
@@ -63,7 +63,7 @@ private function processValue($value, $rootLevel = 0, $level = 0)
             $value->setArguments($this->processValue($value->getArguments(), 0));
             $value->setProperties($this->processValue($value->getProperties(), 1));
             $value->setMethodCalls($this->processValue($value->getMethodCalls(), 2));
-        } elseif (is_array($value)) {
+        } elseif (\is_array($value)) {
             $i = 0;
 
             foreach ($value as $k => $v) {
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveNamedArgumentsPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveNamedArgumentsPass.php
index cd6bb6fe8c58..90cf64adbec3 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveNamedArgumentsPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveNamedArgumentsPass.php
@@ -41,7 +41,7 @@ protected function processValue($value, $isRoot = false)
             $resolvedArguments = array();
 
             foreach ($arguments as $key => $argument) {
-                if (is_int($key)) {
+                if (\is_int($key)) {
                     $resolvedArguments[$key] = $argument;
                     continue;
                 }
@@ -65,7 +65,7 @@ protected function processValue($value, $isRoot = false)
                 }
 
                 if (null !== $argument && !$argument instanceof Reference && !$argument instanceof Definition) {
-                    throw new InvalidArgumentException(sprintf('Invalid service "%s": the value of argument "%s" of method "%s()" must be null, an instance of %s or an instance of %s, %s given.', $this->currentId, $key, $class !== $this->currentId ? $class.'::'.$method : $method, Reference::class, Definition::class, gettype($argument)));
+                    throw new InvalidArgumentException(sprintf('Invalid service "%s": the value of argument "%s" of method "%s()" must be null, an instance of %s or an instance of %s, %s given.', $this->currentId, $key, $class !== $this->currentId ? $class.'::'.$method : $method, Reference::class, Definition::class, \gettype($argument)));
                 }
 
                 $typeFound = false;
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php
index 3988f6dc2783..de16102d46aa 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php
@@ -60,10 +60,10 @@ public function process(ContainerBuilder $container)
 
     protected function processValue($value, $isRoot = false)
     {
-        if (is_string($value)) {
+        if (\is_string($value)) {
             $v = $this->bag->resolveValue($value);
 
-            return $this->resolveArrays || !$v || !is_array($v) ? $v : $value;
+            return $this->resolveArrays || !$v || !\is_array($v) ? $v : $value;
         }
         if ($value instanceof Definition) {
             $value->setBindings($this->processValue($value->getBindings()));
@@ -78,7 +78,7 @@ protected function processValue($value, $isRoot = false)
 
         $value = parent::processValue($value, $isRoot);
 
-        if ($value && is_array($value)) {
+        if ($value && \is_array($value)) {
             $value = array_combine($this->bag->resolveValue(array_keys($value)), $value);
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ResolveReferencesToAliasesPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ResolveReferencesToAliasesPass.php
index 83677a0dd309..31a7a2789e1a 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ResolveReferencesToAliasesPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ResolveReferencesToAliasesPass.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\DependencyInjection\Compiler;
 
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * Replaces all references to aliases with references to the actual service.
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ServiceLocatorTagPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ServiceLocatorTagPass.php
index fb32d501ac29..5a0703e83358 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ServiceLocatorTagPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ServiceLocatorTagPass.php
@@ -37,7 +37,7 @@ protected function processValue($value, $isRoot = false)
         }
 
         $arguments = $value->getArguments();
-        if (!isset($arguments[0]) || !is_array($arguments[0])) {
+        if (!isset($arguments[0]) || !\is_array($arguments[0])) {
             throw new InvalidArgumentException(sprintf('Invalid definition for service "%s": an array of references is expected as first argument when the "container.service_locator" tag is set.', $this->currentId));
         }
 
@@ -46,7 +46,7 @@ protected function processValue($value, $isRoot = false)
                 continue;
             }
             if (!$v instanceof Reference) {
-                throw new InvalidArgumentException(sprintf('Invalid definition for service "%s": an array of references is expected as first argument when the "container.service_locator" tag is set, "%s" found for key "%s".', $this->currentId, is_object($v) ? get_class($v) : gettype($v), $k));
+                throw new InvalidArgumentException(sprintf('Invalid definition for service "%s": an array of references is expected as first argument when the "container.service_locator" tag is set, "%s" found for key "%s".', $this->currentId, \is_object($v) ? \get_class($v) : \gettype($v), $k));
             }
             $arguments[0][$k] = new ServiceClosureArgument($v);
         }
@@ -80,7 +80,7 @@ public static function register(ContainerBuilder $container, array $refMap, $cal
     {
         foreach ($refMap as $id => $ref) {
             if (!$ref instanceof Reference) {
-                throw new InvalidArgumentException(sprintf('Invalid service locator definition: only services can be referenced, "%s" found for key "%s". Inject parameter values using constructors instead.', is_object($ref) ? get_class($ref) : gettype($ref), $id));
+                throw new InvalidArgumentException(sprintf('Invalid service locator definition: only services can be referenced, "%s" found for key "%s". Inject parameter values using constructors instead.', \is_object($ref) ? \get_class($ref) : \gettype($ref), $id));
             }
             $refMap[$id] = new ServiceClosureArgument($ref);
         }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraphNode.php b/src/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraphNode.php
index b7274c425b70..210566f0189d 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraphNode.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraphNode.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Alias;
+use Symfony\Component\DependencyInjection\Definition;
 
 /**
  * Represents a node in your service graph.
diff --git a/src/Symfony/Component/DependencyInjection/Container.php b/src/Symfony/Component/DependencyInjection/Container.php
index b4881b70d315..e6c631bef7e8 100644
--- a/src/Symfony/Component/DependencyInjection/Container.php
+++ b/src/Symfony/Component/DependencyInjection/Container.php
@@ -14,11 +14,11 @@
 use Symfony\Component\DependencyInjection\Exception\EnvNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Exception\ParameterCircularReferenceException;
-use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
-use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
+use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 use Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag;
 use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
 
 /**
  * Container is a dependency injection container.
@@ -262,7 +262,7 @@ public function get($id, $invalidBehavior = /* self::EXCEPTION_ON_INVALID_REFERE
             $alternatives = array();
             foreach ($this->getServiceIds() as $knownId) {
                 $lev = levenshtein($id, $knownId);
-                if ($lev <= strlen($id) / 3 || false !== strpos($knownId, $id)) {
+                if ($lev <= \strlen($id) / 3 || false !== strpos($knownId, $id)) {
                     $alternatives[] = $knownId;
                 }
             }
diff --git a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
index 7fbe2ee335eb..8f7821501f96 100644
--- a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
+++ b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
@@ -12,6 +12,14 @@
 namespace Symfony\Component\DependencyInjection;
 
 use Psr\Container\ContainerInterface as PsrContainerInterface;
+use Symfony\Component\Config\Resource\ClassExistenceResource;
+use Symfony\Component\Config\Resource\ComposerResource;
+use Symfony\Component\Config\Resource\DirectoryResource;
+use Symfony\Component\Config\Resource\FileExistenceResource;
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Config\Resource\GlobResource;
+use Symfony\Component\Config\Resource\ReflectionClassResource;
+use Symfony\Component\Config\Resource\ResourceInterface;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
@@ -26,18 +34,10 @@
 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
 use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
-use Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag;
-use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
-use Symfony\Component\Config\Resource\ClassExistenceResource;
-use Symfony\Component\Config\Resource\ComposerResource;
-use Symfony\Component\Config\Resource\DirectoryResource;
-use Symfony\Component\Config\Resource\FileExistenceResource;
-use Symfony\Component\Config\Resource\FileResource;
-use Symfony\Component\Config\Resource\GlobResource;
-use Symfony\Component\Config\Resource\ReflectionClassResource;
-use Symfony\Component\Config\Resource\ResourceInterface;
 use Symfony\Component\DependencyInjection\LazyProxy\Instantiator\InstantiatorInterface;
 use Symfony\Component\DependencyInjection\LazyProxy\Instantiator\RealServiceInstantiator;
+use Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
 use Symfony\Component\ExpressionLanguage\Expression;
 use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
@@ -292,8 +292,8 @@ public function setResources(array $resources)
     public function addObjectResource($object)
     {
         if ($this->trackResources) {
-            if (is_object($object)) {
-                $object = get_class($object);
+            if (\is_object($object)) {
+                $object = \get_class($object);
             }
             if (!isset($this->classReflectors[$object])) {
                 $this->classReflectors[$object] = new \ReflectionClass($object);
@@ -401,7 +401,7 @@ public function fileExists(string $path, $trackContents = true): bool
 
         if (is_dir($path)) {
             if ($trackContents) {
-                $this->addResource(new DirectoryResource($path, is_string($trackContents) ? $trackContents : null));
+                $this->addResource(new DirectoryResource($path, \is_string($trackContents) ? $trackContents : null));
             } else {
                 $this->addResource(new GlobResource($path, '/*', false));
             }
@@ -429,7 +429,7 @@ public function loadFromExtension($extension, array $values = null)
             throw new BadMethodCallException('Cannot load from an extension on a compiled container.');
         }
 
-        if (func_num_args() < 2) {
+        if (\func_num_args() < 2) {
             $values = array();
         }
 
@@ -810,7 +810,7 @@ public function setAlias($alias, $id)
     {
         $alias = (string) $alias;
 
-        if (is_string($id)) {
+        if (\is_string($id)) {
             $id = new Alias($id);
         } elseif (!$id instanceof Alias) {
             throw new InvalidArgumentException('$id must be a string, or an Alias object.');
@@ -1021,7 +1021,7 @@ public function findDefinition($id)
 
             if (isset($seen[$id])) {
                 $seen = array_values($seen);
-                $seen = array_slice($seen, array_search($id, $seen));
+                $seen = \array_slice($seen, array_search($id, $seen));
                 $seen[] = $id;
 
                 throw new ServiceCircularReferenceException($id, $seen);
@@ -1092,15 +1092,15 @@ private function createService(Definition $definition, array &$inlineServices, $
         }
 
         if (null !== $factory = $definition->getFactory()) {
-            if (is_array($factory)) {
+            if (\is_array($factory)) {
                 $factory = array($this->doResolveServices($parameterBag->resolveValue($factory[0]), $inlineServices), $factory[1]);
-            } elseif (!is_string($factory)) {
+            } elseif (!\is_string($factory)) {
                 throw new RuntimeException(sprintf('Cannot create service "%s" because of invalid factory', $id));
             }
 
-            $service = call_user_func_array($factory, $arguments);
+            $service = \call_user_func_array($factory, $arguments);
 
-            if (!$definition->isDeprecated() && is_array($factory) && is_string($factory[0])) {
+            if (!$definition->isDeprecated() && \is_array($factory) && \is_string($factory[0])) {
                 $r = new \ReflectionClass($factory[0]);
 
                 if (0 < strpos($r->getDocComment(), "\n * @deprecated ")) {
@@ -1132,7 +1132,7 @@ private function createService(Definition $definition, array &$inlineServices, $
         }
 
         if ($callable = $definition->getConfigurator()) {
-            if (is_array($callable)) {
+            if (\is_array($callable)) {
                 $callable[0] = $parameterBag->resolveValue($callable[0]);
 
                 if ($callable[0] instanceof Reference) {
@@ -1142,11 +1142,11 @@ private function createService(Definition $definition, array &$inlineServices, $
                 }
             }
 
-            if (!is_callable($callable)) {
-                throw new InvalidArgumentException(sprintf('The configure callable for class "%s" is not a callable.', get_class($service)));
+            if (!\is_callable($callable)) {
+                throw new InvalidArgumentException(sprintf('The configure callable for class "%s" is not a callable.', \get_class($service)));
             }
 
-            call_user_func($callable, $service);
+            \call_user_func($callable, $service);
         }
 
         return $service;
@@ -1167,7 +1167,7 @@ public function resolveServices($value)
 
     private function doResolveServices($value, array &$inlineServices = array())
     {
-        if (is_array($value)) {
+        if (\is_array($value)) {
             foreach ($value as $k => $v) {
                 $value[$k] = $this->doResolveServices($v, $inlineServices);
             }
@@ -1372,8 +1372,8 @@ public function resolveEnvPlaceholders($value, $format = null, array &$usedEnvs
                         $value = $resolved;
                         $completed = true;
                     } else {
-                        if (!is_string($resolved) && !is_numeric($resolved)) {
-                            throw new RuntimeException(sprintf('A string value must be composed of strings and/or numbers, but found parameter "env(%s)" of type %s inside string value "%s".', $env, gettype($resolved), $this->resolveEnvPlaceholders($value)));
+                        if (!\is_string($resolved) && !is_numeric($resolved)) {
+                            throw new RuntimeException(sprintf('A string value must be composed of strings and/or numbers, but found parameter "env(%s)" of type %s inside string value "%s".', $env, \gettype($resolved), $this->resolveEnvPlaceholders($value)));
                         }
                         $value = str_ireplace($placeholder, $resolved, $value);
                     }
@@ -1430,7 +1430,7 @@ public static function getServiceConditionals($value)
     {
         $services = array();
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             foreach ($value as $v) {
                 $services = array_unique(array_merge($services, self::getServiceConditionals($v)));
             }
@@ -1454,7 +1454,7 @@ public static function getInitializedConditionals($value)
     {
         $services = array();
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             foreach ($value as $v) {
                 $services = array_unique(array_merge($services, self::getInitializedConditionals($v)));
             }
@@ -1487,7 +1487,7 @@ protected function getEnv($name)
         $value = parent::getEnv($name);
         $bag = $this->getParameterBag();
 
-        if (!is_string($value) || !$bag instanceof EnvPlaceholderParameterBag) {
+        if (!\is_string($value) || !$bag instanceof EnvPlaceholderParameterBag) {
             return $value;
         }
 
@@ -1532,7 +1532,7 @@ private function callMethod($service, $call, array &$inlineServices)
             }
         }
 
-        call_user_func_array(array($service, $call[0]), $this->doResolveServices($this->getParameterBag()->unescapeValue($this->getParameterBag()->resolveValue($call[1])), $inlineServices));
+        \call_user_func_array(array($service, $call[0]), $this->doResolveServices($this->getParameterBag()->unescapeValue($this->getParameterBag()->resolveValue($call[1])), $inlineServices));
     }
 
     /**
@@ -1574,7 +1574,7 @@ private function inVendors($path)
         $path = realpath($path) ?: $path;
 
         foreach ($this->vendors as $vendor) {
-            if (0 === strpos($path, $vendor) && false !== strpbrk(substr($path, strlen($vendor), 1), '/'.DIRECTORY_SEPARATOR)) {
+            if (0 === strpos($path, $vendor) && false !== strpbrk(substr($path, \strlen($vendor), 1), '/'.\DIRECTORY_SEPARATOR)) {
                 return true;
             }
         }
diff --git a/src/Symfony/Component/DependencyInjection/Definition.php b/src/Symfony/Component/DependencyInjection/Definition.php
index 9865adbd7a94..c32d334a6089 100644
--- a/src/Symfony/Component/DependencyInjection/Definition.php
+++ b/src/Symfony/Component/DependencyInjection/Definition.php
@@ -96,7 +96,7 @@ public function setFactory($factory)
     {
         $this->changes['factory'] = true;
 
-        if (is_string($factory) && false !== strpos($factory, '::')) {
+        if (\is_string($factory) && false !== strpos($factory, '::')) {
             $factory = explode('::', $factory, 2);
         }
 
@@ -254,12 +254,12 @@ public function addArgument($argument)
      */
     public function replaceArgument($index, $argument)
     {
-        if (0 === count($this->arguments)) {
+        if (0 === \count($this->arguments)) {
             throw new OutOfBoundsException('Cannot replace arguments if none have been configured yet.');
         }
 
-        if (is_int($index) && ($index < 0 || $index > count($this->arguments) - 1)) {
-            throw new OutOfBoundsException(sprintf('The index "%d" is not in the range [0, %d].', $index, count($this->arguments) - 1));
+        if (\is_int($index) && ($index < 0 || $index > \count($this->arguments) - 1)) {
+            throw new OutOfBoundsException(sprintf('The index "%d" is not in the range [0, %d].', $index, \count($this->arguments) - 1));
         }
 
         if (!array_key_exists($index, $this->arguments)) {
@@ -783,7 +783,7 @@ public function setConfigurator($configurator)
     {
         $this->changes['configurator'] = true;
 
-        if (is_string($configurator) && false !== strpos($configurator, '::')) {
+        if (\is_string($configurator) && false !== strpos($configurator, '::')) {
             $configurator = explode('::', $configurator, 2);
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/GraphvizDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/GraphvizDumper.php
index 84cc1f59a5ef..9c35e066e776 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/GraphvizDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/GraphvizDumper.php
@@ -12,12 +12,12 @@
 namespace Symfony\Component\DependencyInjection\Dumper;
 
 use Symfony\Component\DependencyInjection\Argument\ArgumentInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Parameter;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * GraphvizDumper dumps a service container as a graphviz file.
@@ -116,7 +116,7 @@ private function findEdges(string $id, array $arguments, bool $required, string
         foreach ($arguments as $argument) {
             if ($argument instanceof Parameter) {
                 $argument = $this->container->hasParameter($argument) ? $this->container->getParameter($argument) : null;
-            } elseif (is_string($argument) && preg_match('/^%([^%]+)%$/', $argument, $match)) {
+            } elseif (\is_string($argument) && preg_match('/^%([^%]+)%$/', $argument, $match)) {
                 $argument = $this->container->hasParameter($match[1]) ? $this->container->getParameter($match[1]) : null;
             }
 
@@ -132,7 +132,7 @@ private function findEdges(string $id, array $arguments, bool $required, string
                 $edges[] = array('name' => $name, 'required' => $required, 'to' => $argument, 'lazy' => $lazyEdge);
             } elseif ($argument instanceof ArgumentInterface) {
                 $edges = array_merge($edges, $this->findEdges($id, $argument->getValues(), $required, $name, true));
-            } elseif (is_array($argument)) {
+            } elseif (\is_array($argument)) {
                 $edges = array_merge($edges, $this->findEdges($id, $argument, $required, $name, $lazy));
             }
         }
@@ -168,7 +168,7 @@ private function findNodes(): array
             }
 
             if (!$container->hasDefinition($id)) {
-                $nodes[$id] = array('class' => str_replace('\\', '\\\\', get_class($container->get($id))), 'attributes' => $this->options['node.instance']);
+                $nodes[$id] = array('class' => str_replace('\\', '\\\\', \get_class($container->get($id))), 'attributes' => $this->options['node.instance']);
             }
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index ddded17a354b..6f51b0b9fe9f 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -14,23 +14,23 @@
 use Symfony\Component\DependencyInjection\Argument\ArgumentInterface;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
-use Symfony\Component\DependencyInjection\Variable;
-use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Compiler\AnalyzeServiceReferencesPass;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\TypedReference;
-use Symfony\Component\DependencyInjection\Parameter;
+use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Exception\EnvParameterException;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Exception\LogicException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
+use Symfony\Component\DependencyInjection\ExpressionLanguage;
 use Symfony\Component\DependencyInjection\LazyProxy\PhpDumper\DumperInterface as ProxyDumper;
 use Symfony\Component\DependencyInjection\LazyProxy\PhpDumper\NullDumper;
-use Symfony\Component\DependencyInjection\ExpressionLanguage;
+use Symfony\Component\DependencyInjection\Parameter;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\TypedReference;
+use Symfony\Component\DependencyInjection\Variable;
 use Symfony\Component\ExpressionLanguage\Expression;
 use Symfony\Component\HttpKernel\Kernel;
 
@@ -150,13 +150,13 @@ public function dump(array $options = array())
 
         $this->docStar = $options['debug'] ? '*' : '';
 
-        if (!empty($options['file']) && is_dir($dir = dirname($options['file']))) {
+        if (!empty($options['file']) && is_dir($dir = \dirname($options['file']))) {
             // Build a regexp where the first root dirs are mandatory,
             // but every other sub-dir is optional up to the full path in $dir
             // Mandate at least 2 root dirs and not more that 5 optional dirs.
 
-            $dir = explode(DIRECTORY_SEPARATOR, realpath($dir));
-            $i = count($dir);
+            $dir = explode(\DIRECTORY_SEPARATOR, realpath($dir));
+            $i = \count($dir);
 
             if (3 <= $i) {
                 $regex = '';
@@ -164,11 +164,11 @@ public function dump(array $options = array())
                 $this->targetDirMaxMatches = $i - $lastOptionalDir;
 
                 while (--$i >= $lastOptionalDir) {
-                    $regex = sprintf('(%s%s)?', preg_quote(DIRECTORY_SEPARATOR.$dir[$i], '#'), $regex);
+                    $regex = sprintf('(%s%s)?', preg_quote(\DIRECTORY_SEPARATOR.$dir[$i], '#'), $regex);
                 }
 
                 do {
-                    $regex = preg_quote(DIRECTORY_SEPARATOR.$dir[$i], '#').$regex;
+                    $regex = preg_quote(\DIRECTORY_SEPARATOR.$dir[$i], '#').$regex;
                 } while (0 < --$i);
 
                 $this->targetDirRegex = '#'.preg_quote($dir[0], '#').$regex.'#';
@@ -428,7 +428,7 @@ private function addServiceInclude(string $cId, Definition $definition, \SplObje
         if ($this->inlineRequires && !$this->isHotPath($definition)) {
             $lineage = $calls = $behavior = array();
             foreach ($inlinedDefinitions as $def) {
-                if (!$def->isDeprecated() && is_string($class = is_array($factory = $def->getFactory()) && is_string($factory[0]) ? $factory[0] : $def->getClass())) {
+                if (!$def->isDeprecated() && \is_string($class = \is_array($factory = $def->getFactory()) && \is_string($factory[0]) ? $factory[0] : $def->getClass())) {
                     $this->collectLineage($class, $lineage);
                 }
                 $arguments = array($def->getArguments(), $def->getFactory(), $def->getProperties(), $def->getMethodCalls(), $def->getConfigurator());
@@ -440,7 +440,7 @@ private function addServiceInclude(string $cId, Definition $definition, \SplObje
                     && ContainerInterface::IGNORE_ON_UNINITIALIZED_REFERENCE !== $behavior[$id]
                     && $this->container->has($id)
                     && $this->isTrivialInstance($def = $this->container->findDefinition($id))
-                    && is_string($class = is_array($factory = $def->getFactory()) && is_string($factory[0]) ? $factory[0] : $def->getClass())
+                    && \is_string($class = \is_array($factory = $def->getFactory()) && \is_string($factory[0]) ? $factory[0] : $def->getClass())
                 ) {
                     $this->collectLineage($class, $lineage);
                 }
@@ -557,7 +557,7 @@ private function isTrivialInstance(Definition $definition): bool
         if ($definition->isSynthetic() || $definition->getFile() || $definition->getMethodCalls() || $definition->getProperties() || $definition->getConfigurator()) {
             return false;
         }
-        if ($definition->isDeprecated() || $definition->isLazy() || $definition->getFactory() || 3 < count($definition->getArguments())) {
+        if ($definition->isDeprecated() || $definition->isLazy() || $definition->getFactory() || 3 < \count($definition->getArguments())) {
             return false;
         }
 
@@ -565,7 +565,7 @@ private function isTrivialInstance(Definition $definition): bool
             if (!$arg || $arg instanceof Parameter) {
                 continue;
             }
-            if (is_array($arg) && 3 >= count($arg)) {
+            if (\is_array($arg) && 3 >= \count($arg)) {
                 foreach ($arg as $k => $v) {
                     if ($this->dumpValue($k) !== $this->dumpValue($k, false)) {
                         return false;
@@ -657,7 +657,7 @@ private function addServiceConfigurator(Definition $definition, string $variable
             return '';
         }
 
-        if (is_array($callable)) {
+        if (\is_array($callable)) {
             if ($callable[0] instanceof Reference
                 || ($callable[0] instanceof Definition && $this->definitionVariables->contains($callable[0]))) {
                 return sprintf("        %s->%s(\$%s);\n", $this->dumpValue($callable[0]), $callable[1], $variableName);
@@ -692,10 +692,10 @@ private function addService(string $id, Definition $definition, string &$file =
             $return[] = sprintf(0 === strpos($class, '%') ? '@return object A %1$s instance' : '@return \%s', ltrim($class, '\\'));
         } elseif ($definition->getFactory()) {
             $factory = $definition->getFactory();
-            if (is_string($factory)) {
+            if (\is_string($factory)) {
                 $return[] = sprintf('@return object An instance returned by %s()', $factory);
-            } elseif (is_array($factory) && (is_string($factory[0]) || $factory[0] instanceof Definition || $factory[0] instanceof Reference)) {
-                if (is_string($factory[0]) || $factory[0] instanceof Reference) {
+            } elseif (\is_array($factory) && (\is_string($factory[0]) || $factory[0] instanceof Definition || $factory[0] instanceof Reference)) {
+                if (\is_string($factory[0]) || $factory[0] instanceof Reference) {
                     $return[] = sprintf('@return object An instance returned by %s::%s()', (string) $factory[0], $factory[1]);
                 } elseif ($factory[0] instanceof Definition) {
                     $return[] = sprintf('@return object An instance returned by %s::%s()', $factory[0]->getClass(), $factory[1]);
@@ -704,7 +704,7 @@ private function addService(string $id, Definition $definition, string &$file =
         }
 
         if ($definition->isDeprecated()) {
-            if ($return && 0 === strpos($return[count($return) - 1], '@return')) {
+            if ($return && 0 === strpos($return[\count($return) - 1], '@return')) {
                 $return[] = '';
             }
 
@@ -835,7 +835,7 @@ private function addNewInstance(Definition $definition, $return, $instantiation,
 
         if (null !== $definition->getFactory()) {
             $callable = $definition->getFactory();
-            if (is_array($callable)) {
+            if (\is_array($callable)) {
                 if (!preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $callable[1])) {
                     throw new RuntimeException(sprintf('Cannot dump definition because of invalid factory method (%s)', $callable[1] ?: 'n/a'));
                 }
@@ -1116,7 +1116,7 @@ private function addInlineRequires(): string
             $inlinedDefinitions = $this->getDefinitionsFromArguments(array($definition));
 
             foreach ($inlinedDefinitions as $def) {
-                if (is_string($class = is_array($factory = $def->getFactory()) && is_string($factory[0]) ? $factory[0] : $def->getClass())) {
+                if (\is_string($class = \is_array($factory = $def->getFactory()) && \is_string($factory[0]) ? $factory[0] : $def->getClass())) {
                     $this->collectLineage($class, $lineage);
                 }
             }
@@ -1214,7 +1214,7 @@ public function getParameterBag()
         }
 
         if ($dynamicPhp) {
-            $loadedDynamicParameters = $this->exportParameters(array_combine(array_keys($dynamicPhp), array_fill(0, count($dynamicPhp), false)), '', 8);
+            $loadedDynamicParameters = $this->exportParameters(array_combine(array_keys($dynamicPhp), array_fill(0, \count($dynamicPhp), false)), '', 8);
             $getDynamicParameter = <<<'EOF'
         switch ($name) {
 %s
@@ -1271,10 +1271,10 @@ private function exportParameters(array $parameters, string $path = '', int $ind
     {
         $php = array();
         foreach ($parameters as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $value = $this->exportParameters($value, $path.'/'.$key, $indent + 4);
             } elseif ($value instanceof ArgumentInterface) {
-                throw new InvalidArgumentException(sprintf('You cannot dump a container with parameters that contain special arguments. "%s" found in "%s".', get_class($value), $path.'/'.$key));
+                throw new InvalidArgumentException(sprintf('You cannot dump a container with parameters that contain special arguments. "%s" found in "%s".', \get_class($value), $path.'/'.$key));
             } elseif ($value instanceof Variable) {
                 throw new InvalidArgumentException(sprintf('You cannot dump a container with parameters that contain variable references. Variable "%s" found in "%s".', $value, $path.'/'.$key));
             } elseif ($value instanceof Definition) {
@@ -1340,7 +1340,7 @@ private function getServiceConditionals($value): string
     private function getServiceCallsFromArguments(array $arguments, array &$calls, bool $isPreInstance, string $callerId, array &$behavior = array(), int $step = 1)
     {
         foreach ($arguments as $argument) {
-            if (is_array($argument)) {
+            if (\is_array($argument)) {
                 $this->getServiceCallsFromArguments($argument, $calls, $isPreInstance, $callerId, $behavior, $step);
             } elseif ($argument instanceof Reference) {
                 $id = (string) $argument;
@@ -1366,7 +1366,7 @@ private function getDefinitionsFromArguments(array $arguments, \SplObjectStorage
         }
 
         foreach ($arguments as $argument) {
-            if (is_array($argument)) {
+            if (\is_array($argument)) {
                 $this->getDefinitionsFromArguments($argument, $definitions);
             } elseif (!$argument instanceof Definition) {
                 // no-op
@@ -1396,7 +1396,7 @@ private function hasReference(string $id, array $arguments, bool $deep = false,
         }
 
         foreach ($arguments as $argument) {
-            if (is_array($argument)) {
+            if (\is_array($argument)) {
                 if ($this->hasReference($id, $argument, $deep, $visited)) {
                     return true;
                 }
@@ -1440,7 +1440,7 @@ private function hasReference(string $id, array $arguments, bool $deep = false,
      */
     private function dumpValue($value, bool $interpolate = true): string
     {
-        if (is_array($value)) {
+        if (\is_array($value)) {
             if ($value && $interpolate && false !== $param = array_search($value, $this->container->getParameterBag()->all(), true)) {
                 return $this->dumpValue("%$param%");
             }
@@ -1494,7 +1494,7 @@ private function dumpValue($value, bool $interpolate = true): string
                         $countCode[] = '        }';
                     }
 
-                    $code[] = sprintf('        }, %s)', count($operands) > 1 ? implode("\n", $countCode) : $operands[0]);
+                    $code[] = sprintf('        }, %s)', \count($operands) > 1 ? implode("\n", $countCode) : $operands[0]);
 
                     return implode("\n", $code);
                 }
@@ -1523,17 +1523,17 @@ private function dumpValue($value, bool $interpolate = true): string
             if (null !== $value->getFactory()) {
                 $factory = $value->getFactory();
 
-                if (is_string($factory)) {
+                if (\is_string($factory)) {
                     return sprintf('%s(%s)', $this->dumpLiteralClass($this->dumpValue($factory)), implode(', ', $arguments));
                 }
 
-                if (is_array($factory)) {
+                if (\is_array($factory)) {
                     if (!preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $factory[1])) {
                         throw new RuntimeException(sprintf('Cannot dump definition because of invalid factory method (%s)', $factory[1] ?: 'n/a'));
                     }
 
                     $class = $this->dumpValue($factory[0]);
-                    if (is_string($factory[0])) {
+                    if (\is_string($factory[0])) {
                         return sprintf('%s::%s(%s)', $this->dumpLiteralClass($class), $factory[1], implode(', ', $arguments));
                     }
 
@@ -1572,7 +1572,7 @@ private function dumpValue($value, bool $interpolate = true): string
             return $this->getExpressionLanguage()->compile((string) $value, array('this' => 'container'));
         } elseif ($value instanceof Parameter) {
             return $this->dumpParameter($value);
-        } elseif (true === $interpolate && is_string($value)) {
+        } elseif (true === $interpolate && \is_string($value)) {
             if (preg_match('/^%([^%]+)%$/', $value, $match)) {
                 // we do this to deal with non string values (Boolean, integer, ...)
                 // the preg_replace_callback converts them to strings
@@ -1586,7 +1586,7 @@ private function dumpValue($value, bool $interpolate = true): string
 
                 return $code;
             }
-        } elseif (is_object($value) || is_resource($value)) {
+        } elseif (\is_object($value) || \is_resource($value)) {
             throw new RuntimeException('Unable to dump a service container if a parameter is an object or a resource.');
         }
 
@@ -1618,7 +1618,7 @@ private function dumpParameter(string $name): string
             $value = $this->container->getParameter($name);
             $dumpedValue = $this->dumpValue($value, false);
 
-            if (!$value || !is_array($value)) {
+            if (!$value || !\is_array($value)) {
                 return $dumpedValue;
             }
 
@@ -1720,9 +1720,9 @@ private function generateMethodName(string $id): string
     private function getNextVariableName(): string
     {
         $firstChars = self::FIRST_CHARS;
-        $firstCharsLength = strlen($firstChars);
+        $firstCharsLength = \strlen($firstChars);
         $nonFirstChars = self::NON_FIRST_CHARS;
-        $nonFirstCharsLength = strlen($nonFirstChars);
+        $nonFirstCharsLength = \strlen($nonFirstChars);
 
         while (true) {
             $name = '';
@@ -1742,7 +1742,7 @@ private function getNextVariableName(): string
             ++$this->variableCount;
 
             // check that the name is not reserved
-            if (in_array($name, $this->reservedVariables, true)) {
+            if (\in_array($name, $this->reservedVariables, true)) {
                 continue;
             }
 
@@ -1784,12 +1784,12 @@ private function isHotPath(Definition $definition)
 
     private function export($value)
     {
-        if (null !== $this->targetDirRegex && is_string($value) && preg_match($this->targetDirRegex, $value, $matches, PREG_OFFSET_CAPTURE)) {
+        if (null !== $this->targetDirRegex && \is_string($value) && preg_match($this->targetDirRegex, $value, $matches, PREG_OFFSET_CAPTURE)) {
             $prefix = $matches[0][1] ? $this->doExport(substr($value, 0, $matches[0][1]), true).'.' : '';
-            $suffix = $matches[0][1] + strlen($matches[0][0]);
+            $suffix = $matches[0][1] + \strlen($matches[0][0]);
             $suffix = isset($value[$suffix]) ? '.'.$this->doExport(substr($value, $suffix), true) : '';
             $dirname = $this->asFiles ? '$this->containerDir' : '__DIR__';
-            $offset = 1 + $this->targetDirMaxMatches - count($matches);
+            $offset = 1 + $this->targetDirMaxMatches - \count($matches);
 
             if ($this->asFiles || 0 < $offset) {
                 $dirname = sprintf('$this->targetDirs[%d]', $offset);
@@ -1807,7 +1807,7 @@ private function export($value)
 
     private function doExport($value, $resolveEnv = false)
     {
-        if (is_string($value) && false !== strpos($value, "\n")) {
+        if (\is_string($value) && false !== strpos($value, "\n")) {
             $cleanParts = explode("\n", $value);
             $cleanParts = array_map(function ($part) { return var_export($part, true); }, $cleanParts);
             $export = implode('."\n".', $cleanParts);
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php
index defbc7ae89da..d945975c1b51 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php
@@ -11,15 +11,15 @@
 
 namespace Symfony\Component\DependencyInjection\Dumper;
 
+use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
 use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Symfony\Component\DependencyInjection\Parameter;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Parameter;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\ExpressionLanguage\Expression;
 
 /**
@@ -80,7 +80,7 @@ private function addMethodCalls(array $methodcalls, \DOMElement $parent)
         foreach ($methodcalls as $methodcall) {
             $call = $this->document->createElement('call');
             $call->setAttribute('method', $methodcall[0]);
-            if (count($methodcall[1])) {
+            if (\count($methodcall[1])) {
                 $this->convertParameters($methodcall[1], 'argument', $call);
             }
             $parent->appendChild($call);
@@ -160,10 +160,10 @@ private function addService($definition, $id, \DOMElement $parent)
         if ($callable = $definition->getFactory()) {
             $factory = $this->document->createElement('factory');
 
-            if (is_array($callable) && $callable[0] instanceof Definition) {
+            if (\is_array($callable) && $callable[0] instanceof Definition) {
                 $this->addService($callable[0], null, $factory);
                 $factory->setAttribute('method', $callable[1]);
-            } elseif (is_array($callable)) {
+            } elseif (\is_array($callable)) {
                 if (null !== $callable[0]) {
                     $factory->setAttribute($callable[0] instanceof Reference ? 'service' : 'class', $callable[0]);
                 }
@@ -196,10 +196,10 @@ private function addService($definition, $id, \DOMElement $parent)
         if ($callable = $definition->getConfigurator()) {
             $configurator = $this->document->createElement('configurator');
 
-            if (is_array($callable) && $callable[0] instanceof Definition) {
+            if (\is_array($callable) && $callable[0] instanceof Definition) {
                 $this->addService($callable[0], null, $configurator);
                 $configurator->setAttribute('method', $callable[1]);
-            } elseif (is_array($callable)) {
+            } elseif (\is_array($callable)) {
                 $configurator->setAttribute($callable[0] instanceof Reference ? 'service' : 'class', $callable[0]);
                 $configurator->setAttribute('method', $callable[1]);
             } else {
@@ -261,7 +261,7 @@ private function addServices(\DOMElement $parent)
      */
     private function convertParameters(array $parameters, $type, \DOMElement $parent, $keyAttribute = 'key')
     {
-        $withKeys = array_keys($parameters) !== range(0, count($parameters) - 1);
+        $withKeys = array_keys($parameters) !== range(0, \count($parameters) - 1);
         foreach ($parameters as $key => $value) {
             $element = $this->document->createElement($type);
             if ($withKeys) {
@@ -271,7 +271,7 @@ private function convertParameters(array $parameters, $type, \DOMElement $parent
             if ($value instanceof ServiceClosureArgument) {
                 $value = $value->getValues()[0];
             }
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $element->setAttribute('type', 'collection');
                 $this->convertParameters($value, $type, $element, 'key');
             } elseif ($value instanceof TaggedIteratorArgument) {
@@ -299,7 +299,7 @@ private function convertParameters(array $parameters, $type, \DOMElement $parent
                 $text = $this->document->createTextNode(self::phpToXml((string) $value));
                 $element->appendChild($text);
             } else {
-                if (in_array($value, array('null', 'true', 'false'), true)) {
+                if (\in_array($value, array('null', 'true', 'false'), true)) {
                     $element->setAttribute('type', 'string');
                 }
                 $text = $this->document->createTextNode(self::phpToXml($value));
@@ -318,9 +318,9 @@ private function escape(array $arguments)
     {
         $args = array();
         foreach ($arguments as $k => $v) {
-            if (is_array($v)) {
+            if (\is_array($v)) {
                 $args[$k] = $this->escape($v);
-            } elseif (is_string($v)) {
+            } elseif (\is_string($v)) {
                 $args[$k] = str_replace('%', '%%', $v);
             } else {
                 $args[$k] = $v;
@@ -350,7 +350,7 @@ public static function phpToXml($value)
                 return 'false';
             case $value instanceof Parameter:
                 return '%'.$value.'%';
-            case is_object($value) || is_resource($value):
+            case \is_object($value) || \is_resource($value):
                 throw new RuntimeException('Unable to dump a service container if a parameter is an object or a resource.');
             default:
                 return (string) $value;
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
index d2cf2454613d..0370cb9616bf 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
@@ -11,10 +11,6 @@
 
 namespace Symfony\Component\DependencyInjection\Dumper;
 
-use Symfony\Component\Yaml\Dumper as YmlDumper;
-use Symfony\Component\Yaml\Parser;
-use Symfony\Component\Yaml\Tag\TaggedValue;
-use Symfony\Component\Yaml\Yaml;
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Argument\ArgumentInterface;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
@@ -22,10 +18,14 @@
 use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\Parameter;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\ExpressionLanguage\Expression;
+use Symfony\Component\Yaml\Dumper as YmlDumper;
+use Symfony\Component\Yaml\Parser;
+use Symfony\Component\Yaml\Tag\TaggedValue;
+use Symfony\Component\Yaml\Yaml;
 
 /**
  * YamlDumper dumps a service container as a YAML string.
@@ -202,7 +202,7 @@ private function addParameters(): string
      */
     private function dumpCallable($callable)
     {
-        if (is_array($callable)) {
+        if (\is_array($callable)) {
             if ($callable[0] instanceof Reference) {
                 $callable = array($this->getServiceCall((string) $callable[0], $callable[0]), $callable[1]);
             } else {
@@ -234,13 +234,13 @@ private function dumpValue($value)
             if ($value instanceof IteratorArgument) {
                 $tag = 'iterator';
             } else {
-                throw new RuntimeException(sprintf('Unspecified Yaml tag for type "%s".', get_class($value)));
+                throw new RuntimeException(sprintf('Unspecified Yaml tag for type "%s".', \get_class($value)));
             }
 
             return new TaggedValue($tag, $this->dumpValue($value->getValues()));
         }
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             $code = array();
             foreach ($value as $k => $v) {
                 $code[$k] = $this->dumpValue($v);
@@ -255,7 +255,7 @@ private function dumpValue($value)
             return $this->getExpressionCall((string) $value);
         } elseif ($value instanceof Definition) {
             return new TaggedValue('service', (new Parser())->parse("_:\n".$this->addService('_', $value), Yaml::PARSE_CUSTOM_TAGS)['_']['_']);
-        } elseif (is_object($value) || is_resource($value)) {
+        } elseif (\is_object($value) || \is_resource($value)) {
             throw new RuntimeException('Unable to dump a service container if a parameter is an object or a resource.');
         }
 
@@ -289,9 +289,9 @@ private function prepareParameters(array $parameters, bool $escape = true): arra
     {
         $filtered = array();
         foreach ($parameters as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $value = $this->prepareParameters($value, $escape);
-            } elseif ($value instanceof Reference || is_string($value) && 0 === strpos($value, '@')) {
+            } elseif ($value instanceof Reference || \is_string($value) && 0 === strpos($value, '@')) {
                 $value = '@'.$value;
             }
 
@@ -305,9 +305,9 @@ private function escape(array $arguments): array
     {
         $args = array();
         foreach ($arguments as $k => $v) {
-            if (is_array($v)) {
+            if (\is_array($v)) {
                 $args[$k] = $this->escape($v);
-            } elseif (is_string($v)) {
+            } elseif (\is_string($v)) {
                 $args[$k] = str_replace('%', '%%', $v);
             } else {
                 $args[$k] = $v;
diff --git a/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php b/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php
index d4c60a8606a1..13568079bb68 100644
--- a/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php
+++ b/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php
@@ -110,11 +110,11 @@ public function getEnv($prefix, $name, \Closure $getEnv)
         }
 
         if ('const' === $prefix) {
-            if (!defined($env)) {
+            if (!\defined($env)) {
                 throw new RuntimeException(sprintf('Env var "%s" maps to undefined constant "%s".', $name, $env));
             }
 
-            return constant($env);
+            return \constant($env);
         }
 
         if ('base64' === $prefix) {
@@ -128,8 +128,8 @@ public function getEnv($prefix, $name, \Closure $getEnv)
                 throw new RuntimeException(sprintf('Invalid JSON in env var "%s": '.json_last_error_msg(), $name));
             }
 
-            if (!is_array($env)) {
-                throw new RuntimeException(sprintf('Invalid JSON env var "%s": array expected, %s given.', $name, gettype($env)));
+            if (!\is_array($env)) {
+                throw new RuntimeException(sprintf('Invalid JSON env var "%s": array expected, %s given.', $name, \gettype($env)));
             }
 
             return $env;
@@ -142,7 +142,7 @@ public function getEnv($prefix, $name, \Closure $getEnv)
                 }
                 $value = $this->container->getParameter($match[1]);
                 if (!is_scalar($value)) {
-                    throw new RuntimeException(sprintf('Parameter "%s" found when resolving env var "%s" must be scalar, "%s" given.', $match[1], $name, gettype($value)));
+                    throw new RuntimeException(sprintf('Parameter "%s" found when resolving env var "%s" must be scalar, "%s" given.', $match[1], $name, \gettype($value)));
                 }
 
                 return $value;
diff --git a/src/Symfony/Component/DependencyInjection/Exception/ParameterNotFoundException.php b/src/Symfony/Component/DependencyInjection/Exception/ParameterNotFoundException.php
index ec9155bb64f7..9eaa43b339aa 100644
--- a/src/Symfony/Component/DependencyInjection/Exception/ParameterNotFoundException.php
+++ b/src/Symfony/Component/DependencyInjection/Exception/ParameterNotFoundException.php
@@ -56,7 +56,7 @@ public function updateRepr()
         }
 
         if ($this->alternatives) {
-            if (1 == count($this->alternatives)) {
+            if (1 == \count($this->alternatives)) {
                 $this->message .= ' Did you mean this: "';
             } else {
                 $this->message .= ' Did you mean one of these: "';
diff --git a/src/Symfony/Component/DependencyInjection/Exception/ServiceNotFoundException.php b/src/Symfony/Component/DependencyInjection/Exception/ServiceNotFoundException.php
index dabd9da4a41e..d867ec6f869c 100644
--- a/src/Symfony/Component/DependencyInjection/Exception/ServiceNotFoundException.php
+++ b/src/Symfony/Component/DependencyInjection/Exception/ServiceNotFoundException.php
@@ -35,7 +35,7 @@ public function __construct(string $id, string $sourceId = null, \Exception $pre
         }
 
         if ($alternatives) {
-            if (1 == count($alternatives)) {
+            if (1 == \count($alternatives)) {
                 $msg .= ' Did you mean this: "';
             } else {
                 $msg .= ' Did you mean one of these: "';
diff --git a/src/Symfony/Component/DependencyInjection/Extension/ConfigurationExtensionInterface.php b/src/Symfony/Component/DependencyInjection/Extension/ConfigurationExtensionInterface.php
index da590635bccd..c3bd8423ba64 100644
--- a/src/Symfony/Component/DependencyInjection/Extension/ConfigurationExtensionInterface.php
+++ b/src/Symfony/Component/DependencyInjection/Extension/ConfigurationExtensionInterface.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\Extension;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * ConfigurationExtensionInterface is the interface implemented by container extension classes.
diff --git a/src/Symfony/Component/DependencyInjection/Extension/Extension.php b/src/Symfony/Component/DependencyInjection/Extension/Extension.php
index 9542c740e166..1bafdbebd08d 100644
--- a/src/Symfony/Component/DependencyInjection/Extension/Extension.php
+++ b/src/Symfony/Component/DependencyInjection/Extension/Extension.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\DependencyInjection\Extension;
 
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\BadMethodCallException;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\Config\Definition\Processor;
-use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * Provides useful features shared by many extensions.
@@ -65,7 +65,7 @@ public function getNamespace()
      */
     public function getAlias()
     {
-        $className = get_class($this);
+        $className = \get_class($this);
         if ('Extension' != substr($className, -9)) {
             throw new BadMethodCallException('This extension does not follow the naming convention; you must overwrite the getAlias() method.');
         }
@@ -79,7 +79,7 @@ public function getAlias()
      */
     public function getConfiguration(array $config, ContainerBuilder $container)
     {
-        $class = get_class($this);
+        $class = \get_class($this);
         $class = substr_replace($class, '\Configuration', strrpos($class, '\\'));
         $class = $container->getReflectionClass($class);
         $constructor = $class ? $class->getConstructor() : null;
diff --git a/src/Symfony/Component/DependencyInjection/LazyProxy/Instantiator/RealServiceInstantiator.php b/src/Symfony/Component/DependencyInjection/LazyProxy/Instantiator/RealServiceInstantiator.php
index cad9320039b1..3b0b57ef0f6b 100644
--- a/src/Symfony/Component/DependencyInjection/LazyProxy/Instantiator/RealServiceInstantiator.php
+++ b/src/Symfony/Component/DependencyInjection/LazyProxy/Instantiator/RealServiceInstantiator.php
@@ -28,6 +28,6 @@ class RealServiceInstantiator implements InstantiatorInterface
      */
     public function instantiateProxy(ContainerInterface $container, Definition $definition, $id, $realInstantiator)
     {
-        return call_user_func($realInstantiator);
+        return \call_user_func($realInstantiator);
     }
 }
diff --git a/src/Symfony/Component/DependencyInjection/LazyProxy/ProxyHelper.php b/src/Symfony/Component/DependencyInjection/LazyProxy/ProxyHelper.php
index d258980d6660..65e432d93c8e 100644
--- a/src/Symfony/Component/DependencyInjection/LazyProxy/ProxyHelper.php
+++ b/src/Symfony/Component/DependencyInjection/LazyProxy/ProxyHelper.php
@@ -31,7 +31,7 @@ public static function getTypeHint(\ReflectionFunctionAbstract $r, \ReflectionPa
         if (!$type) {
             return;
         }
-        if (!is_string($type)) {
+        if (!\is_string($type)) {
             $name = $type->getName();
 
             if ($type->isBuiltin()) {
diff --git a/src/Symfony/Component/DependencyInjection/Loader/ClosureLoader.php b/src/Symfony/Component/DependencyInjection/Loader/ClosureLoader.php
index f8f2efe2e9e6..183cacc4d61f 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/ClosureLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/ClosureLoader.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\Loader;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\Config\Loader\Loader;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * ClosureLoader loads service definitions from a PHP closure.
@@ -35,7 +35,7 @@ public function __construct(ContainerBuilder $container)
      */
     public function load($resource, $type = null)
     {
-        call_user_func($resource, $this->container);
+        \call_user_func($resource, $this->container);
     }
 
     /**
diff --git a/src/Symfony/Component/DependencyInjection/Loader/Configurator/AbstractConfigurator.php b/src/Symfony/Component/DependencyInjection/Loader/Configurator/AbstractConfigurator.php
index 73ca320e3124..d11347aeabe5 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/Configurator/AbstractConfigurator.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/Configurator/AbstractConfigurator.php
@@ -28,10 +28,10 @@ abstract class AbstractConfigurator
     public function __call($method, $args)
     {
         if (method_exists($this, 'set'.$method)) {
-            return call_user_func_array(array($this, 'set'.$method), $args);
+            return \call_user_func_array(array($this, 'set'.$method), $args);
         }
 
-        throw new \BadMethodCallException(sprintf('Call to undefined method %s::%s()', get_class($this), $method));
+        throw new \BadMethodCallException(sprintf('Call to undefined method %s::%s()', \get_class($this), $method));
     }
 
     /**
@@ -44,7 +44,7 @@ public function __call($method, $args)
      */
     public static function processValue($value, $allowServices = false)
     {
-        if (is_array($value)) {
+        if (\is_array($value)) {
             foreach ($value as $k => $v) {
                 $value[$k] = static::processValue($v, $allowServices);
             }
@@ -82,6 +82,6 @@ public static function processValue($value, $allowServices = false)
                 }
         }
 
-        throw new InvalidArgumentException(sprintf('Cannot use values of type "%s" in service configuration files.', is_object($value) ? get_class($value) : gettype($value)));
+        throw new InvalidArgumentException(sprintf('Cannot use values of type "%s" in service configuration files.', \is_object($value) ? \get_class($value) : \gettype($value)));
     }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Loader/Configurator/ContainerConfigurator.php b/src/Symfony/Component/DependencyInjection/Loader/Configurator/ContainerConfigurator.php
index de365fde928d..eb867f125593 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/Configurator/ContainerConfigurator.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/Configurator/ContainerConfigurator.php
@@ -59,7 +59,7 @@ final public function extension(string $namespace, array $config)
 
     final public function import(string $resource, string $type = null, bool $ignoreErrors = false)
     {
-        $this->loader->setCurrentDir(dirname($this->path));
+        $this->loader->setCurrentDir(\dirname($this->path));
         $this->loader->import($resource, $type, $ignoreErrors, $this->file);
     }
 
diff --git a/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/FactoryTrait.php b/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/FactoryTrait.php
index 12e8859ca1bb..0d50fb747f77 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/FactoryTrait.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/FactoryTrait.php
@@ -24,7 +24,7 @@ trait FactoryTrait
      */
     final public function factory($factory)
     {
-        if (is_string($factory) && 1 === substr_count($factory, ':')) {
+        if (\is_string($factory) && 1 === substr_count($factory, ':')) {
             $factoryParts = explode(':', $factory);
 
             throw new InvalidArgumentException(sprintf('Invalid factory "%s": the `service:method` notation is not available when using PHP-based DI configuration. Use "[ref(\'%s\'), \'%s\']" instead.', $factory, $factoryParts[0], $factoryParts[1]));
diff --git a/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/TagTrait.php b/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/TagTrait.php
index aeb8b047d428..c165b6503e79 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/TagTrait.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/Configurator/Traits/TagTrait.php
@@ -25,7 +25,7 @@ trait TagTrait
      */
     final public function tag($name, array $attributes = array())
     {
-        if (!is_string($name) || '' === $name) {
+        if (!\is_string($name) || '' === $name) {
             throw new InvalidArgumentException(sprintf('The tag name for service "%s" must be a non-empty string.', $this->id));
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Loader/DirectoryLoader.php b/src/Symfony/Component/DependencyInjection/Loader/DirectoryLoader.php
index 769f1026e8d9..a57cac3b5ee9 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/DirectoryLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/DirectoryLoader.php
@@ -49,6 +49,6 @@ public function supports($resource, $type = null)
             return true;
         }
 
-        return null === $type && is_string($resource) && '/' === substr($resource, -1);
+        return null === $type && \is_string($resource) && '/' === substr($resource, -1);
     }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
index 83a3f4f87ca4..858f2bca97f7 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\DependencyInjection\Loader;
 
+use Symfony\Component\Config\FileLocatorInterface;
+use Symfony\Component\Config\Loader\FileLoader as BaseFileLoader;
+use Symfony\Component\Config\Resource\GlobResource;
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
-use Symfony\Component\Config\Loader\FileLoader as BaseFileLoader;
-use Symfony\Component\Config\FileLocatorInterface;
-use Symfony\Component\Config\Resource\GlobResource;
 
 /**
  * FileLoader is the abstract class used by all built-in loaders that are file based.
@@ -93,7 +93,7 @@ protected function setDefinition($id, Definition $definition)
     {
         if ($this->isLoadingInstanceof) {
             if (!$definition instanceof ChildDefinition) {
-                throw new InvalidArgumentException(sprintf('Invalid type definition "%s": ChildDefinition expected, "%s" given.', $id, get_class($definition)));
+                throw new InvalidArgumentException(sprintf('Invalid type definition "%s": ChildDefinition expected, "%s" given.', $id, \get_class($definition)));
             }
             $this->instanceof[$id] = $definition;
         } else {
@@ -125,7 +125,7 @@ private function findClasses($namespace, $pattern, $excludePattern)
         $prefixLen = null;
         foreach ($this->glob($pattern, true, $resource) as $path => $info) {
             if (null === $prefixLen) {
-                $prefixLen = strlen($resource->getPrefix());
+                $prefixLen = \strlen($resource->getPrefix());
 
                 if ($excludePrefix && 0 !== strpos($excludePrefix, $resource->getPrefix())) {
                     throw new InvalidArgumentException(sprintf('Invalid "exclude" pattern when importing classes for "%s": make sure your "exclude" pattern (%s) is a subset of the "resource" pattern (%s)', $namespace, $excludePattern, $pattern));
@@ -139,7 +139,7 @@ private function findClasses($namespace, $pattern, $excludePattern)
             if (!preg_match($extRegexp, $path, $m) || !$info->isReadable()) {
                 continue;
             }
-            $class = $namespace.ltrim(str_replace('/', '\\', substr($path, $prefixLen, -strlen($m[0]))), '\\');
+            $class = $namespace.ltrim(str_replace('/', '\\', substr($path, $prefixLen, -\strlen($m[0]))), '\\');
 
             if (!preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+(?:\\\\[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+)*+$/', $class)) {
                 continue;
diff --git a/src/Symfony/Component/DependencyInjection/Loader/IniFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/IniFileLoader.php
index 6cc9a1acaf25..ed3709104a6f 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/IniFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/IniFileLoader.php
@@ -39,7 +39,7 @@ public function load($resource, $type = null)
         // real raw parsing
         $result = parse_ini_file($path, true, INI_SCANNER_RAW);
 
-        if (isset($result['parameters']) && is_array($result['parameters'])) {
+        if (isset($result['parameters']) && \is_array($result['parameters'])) {
             foreach ($result['parameters'] as $key => $value) {
                 $this->container->setParameter($key, $this->phpize($value));
             }
@@ -51,7 +51,7 @@ public function load($resource, $type = null)
      */
     public function supports($resource, $type = null)
     {
-        if (!is_string($resource)) {
+        if (!\is_string($resource)) {
             return false;
         }
 
@@ -74,15 +74,15 @@ private function phpize($value)
         $lowercaseValue = strtolower($value);
 
         switch (true) {
-            case defined($value):
-                return constant($value);
+            case \defined($value):
+                return \constant($value);
             case 'yes' === $lowercaseValue || 'on' === $lowercaseValue:
                 return true;
             case 'no' === $lowercaseValue || 'off' === $lowercaseValue || 'none' === $lowercaseValue:
                 return false;
             case isset($value[1]) && (
-                ("'" === $value[0] && "'" === $value[strlen($value) - 1]) ||
-                ('"' === $value[0] && '"' === $value[strlen($value) - 1])
+                ("'" === $value[0] && "'" === $value[\strlen($value) - 1]) ||
+                ('"' === $value[0] && '"' === $value[\strlen($value) - 1])
             ):
                 // quoted string
                 return substr($value, 1, -1);
diff --git a/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
index f0be7534ea67..ff8df43f8408 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
@@ -33,7 +33,7 @@ public function load($resource, $type = null)
         $loader = $this;
 
         $path = $this->locator->locate($resource);
-        $this->setCurrentDir(dirname($path));
+        $this->setCurrentDir(\dirname($path));
         $this->container->fileExists($path);
 
         // the closure forbids access to the private scope in the included file
@@ -53,7 +53,7 @@ public function load($resource, $type = null)
      */
     public function supports($resource, $type = null)
     {
-        if (!is_string($resource)) {
+        if (!\is_string($resource)) {
             return false;
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
index 71ddd2227b60..ad5b46cce35d 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
@@ -12,17 +12,17 @@
 namespace Symfony\Component\DependencyInjection\Loader;
 
 use Symfony\Component\Config\Util\XmlUtils;
-use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
-use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Argument\BoundArgument;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
-use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\ExpressionLanguage\Expression;
 
 /**
@@ -72,7 +72,7 @@ public function load($resource, $type = null)
      */
     public function supports($resource, $type = null)
     {
-        if (!is_string($resource)) {
+        if (!\is_string($resource)) {
             return false;
         }
 
@@ -111,7 +111,7 @@ private function parseImports(\DOMDocument $xml, $file)
             return;
         }
 
-        $defaultDirectory = dirname($file);
+        $defaultDirectory = \dirname($file);
         foreach ($imports as $import) {
             $this->setCurrentDir($defaultDirectory);
             $this->import($import->getAttribute('resource'), XmlUtils::phpize($import->getAttribute('type')) ?: null, (bool) XmlUtils::phpize($import->getAttribute('ignore-errors')), $file);
@@ -132,7 +132,7 @@ private function parseDefinitions(\DOMDocument $xml, $file, $defaults)
         if (false === $services = $xpath->query('//container:services/container:service|//container:services/container:prototype')) {
             return;
         }
-        $this->setCurrentDir(dirname($file));
+        $this->setCurrentDir(\dirname($file));
 
         $this->instanceof = array();
         $this->isLoadingInstanceof = true;
@@ -515,7 +515,7 @@ private function getArgumentsAsPhp(\DOMElement $node, $name, $file, $lowercase =
                     $arguments[$key] = $arg->nodeValue;
                     break;
                 case 'constant':
-                    $arguments[$key] = constant(trim($arg->nodeValue));
+                    $arguments[$key] = \constant(trim($arg->nodeValue));
                     break;
                 default:
                     $arguments[$key] = XmlUtils::phpize($arg->nodeValue);
@@ -560,7 +560,7 @@ public function validateSchema(\DOMDocument $dom)
 
         if ($element = $dom->documentElement->getAttributeNS('http://www.w3.org/2001/XMLSchema-instance', 'schemaLocation')) {
             $items = preg_split('/\s+/', $element);
-            for ($i = 0, $nb = count($items); $i < $nb; $i += 2) {
+            for ($i = 0, $nb = \count($items); $i < $nb; $i += 2) {
                 if (!$this->container->hasExtension($items[$i])) {
                     continue;
                 }
@@ -569,7 +569,7 @@ public function validateSchema(\DOMDocument $dom)
                     $path = str_replace($extension->getNamespace(), str_replace('\\', '/', $extension->getXsdValidationBasePath()).'/', $items[$i + 1]);
 
                     if (!is_file($path)) {
-                        throw new RuntimeException(sprintf('Extension "%s" references a non-existent XSD file "%s"', get_class($extension), $path));
+                        throw new RuntimeException(sprintf('Extension "%s" references a non-existent XSD file "%s"', \get_class($extension), $path));
                     }
 
                     $schemaLocations[$items[$i]] = $path;
@@ -593,7 +593,7 @@ public function validateSchema(\DOMDocument $dom)
                     $locationstart = 'phar:///';
                 }
             }
-            $drive = '\\' === DIRECTORY_SEPARATOR ? array_shift($parts).'/' : '';
+            $drive = '\\' === \DIRECTORY_SEPARATOR ? array_shift($parts).'/' : '';
             $location = $locationstart.$drive.implode('/', array_map('rawurlencode', $parts));
 
             $imports .= sprintf('  <xsd:import namespace="%s" schemaLocation="%s" />'."\n", $namespace, $location);
@@ -632,7 +632,7 @@ public function validateSchema(\DOMDocument $dom)
     private function validateAlias(\DOMElement $alias, $file)
     {
         foreach ($alias->attributes as $name => $node) {
-            if (!in_array($name, array('alias', 'id', 'public'))) {
+            if (!\in_array($name, array('alias', 'id', 'public'))) {
                 throw new InvalidArgumentException(sprintf('Invalid attribute "%s" defined for alias "%s" in "%s".', $name, $alias->getAttribute('id'), $file));
             }
         }
@@ -686,7 +686,7 @@ private function loadFromExtensions(\DOMDocument $xml)
             }
 
             $values = static::convertDomElementToArray($node);
-            if (!is_array($values)) {
+            if (!\is_array($values)) {
                 $values = array();
             }
 
diff --git a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
index 81584f57ef30..49ce8fbdde26 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
@@ -20,14 +20,14 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\ExpressionLanguage\Expression;
 use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Parser as YamlParser;
 use Symfony\Component\Yaml\Tag\TaggedValue;
 use Symfony\Component\Yaml\Yaml;
-use Symfony\Component\ExpressionLanguage\Expression;
 
 /**
  * YamlFileLoader loads YAML files service definitions.
@@ -127,7 +127,7 @@ public function load($resource, $type = null)
 
         // parameters
         if (isset($content['parameters'])) {
-            if (!is_array($content['parameters'])) {
+            if (!\is_array($content['parameters'])) {
                 throw new InvalidArgumentException(sprintf('The "parameters" key should contain an array in %s. Check your YAML syntax.', $path));
             }
 
@@ -142,7 +142,7 @@ public function load($resource, $type = null)
         // services
         $this->anonymousServicesCount = 0;
         $this->anonymousServicesSuffix = ContainerBuilder::hash($path);
-        $this->setCurrentDir(dirname($path));
+        $this->setCurrentDir(\dirname($path));
         try {
             $this->parseDefinitions($content, $path);
         } finally {
@@ -155,15 +155,15 @@ public function load($resource, $type = null)
      */
     public function supports($resource, $type = null)
     {
-        if (!is_string($resource)) {
+        if (!\is_string($resource)) {
             return false;
         }
 
-        if (null === $type && in_array(pathinfo($resource, PATHINFO_EXTENSION), array('yaml', 'yml'), true)) {
+        if (null === $type && \in_array(pathinfo($resource, PATHINFO_EXTENSION), array('yaml', 'yml'), true)) {
             return true;
         }
 
-        return in_array($type, array('yaml', 'yml'), true);
+        return \in_array($type, array('yaml', 'yml'), true);
     }
 
     private function parseImports(array $content, string $file)
@@ -172,13 +172,13 @@ private function parseImports(array $content, string $file)
             return;
         }
 
-        if (!is_array($content['imports'])) {
+        if (!\is_array($content['imports'])) {
             throw new InvalidArgumentException(sprintf('The "imports" key should contain an array in %s. Check your YAML syntax.', $file));
         }
 
-        $defaultDirectory = dirname($file);
+        $defaultDirectory = \dirname($file);
         foreach ($content['imports'] as $import) {
-            if (!is_array($import)) {
+            if (!\is_array($import)) {
                 $import = array('resource' => $import);
             }
             if (!isset($import['resource'])) {
@@ -196,7 +196,7 @@ private function parseDefinitions(array $content, string $file)
             return;
         }
 
-        if (!is_array($content['services'])) {
+        if (!\is_array($content['services'])) {
             throw new InvalidArgumentException(sprintf('The "services" key should contain an array in %s. Check your YAML syntax.', $file));
         }
 
@@ -204,16 +204,16 @@ private function parseDefinitions(array $content, string $file)
             $instanceof = $content['services']['_instanceof'];
             unset($content['services']['_instanceof']);
 
-            if (!is_array($instanceof)) {
-                throw new InvalidArgumentException(sprintf('Service "_instanceof" key must be an array, "%s" given in "%s".', gettype($instanceof), $file));
+            if (!\is_array($instanceof)) {
+                throw new InvalidArgumentException(sprintf('Service "_instanceof" key must be an array, "%s" given in "%s".', \gettype($instanceof), $file));
             }
             $this->instanceof = array();
             $this->isLoadingInstanceof = true;
             foreach ($instanceof as $id => $service) {
-                if (!$service || !is_array($service)) {
+                if (!$service || !\is_array($service)) {
                     throw new InvalidArgumentException(sprintf('Type definition "%s" must be a non-empty array within "_instanceof" in %s. Check your YAML syntax.', $id, $file));
                 }
-                if (is_string($service) && 0 === strpos($service, '@')) {
+                if (\is_string($service) && 0 === strpos($service, '@')) {
                     throw new InvalidArgumentException(sprintf('Type definition "%s" cannot be an alias within "_instanceof" in %s. Check your YAML syntax.', $id, $file));
                 }
                 $this->parseDefinition($id, $service, $file, array());
@@ -238,8 +238,8 @@ private function parseDefaults(array &$content, string $file): array
         $defaults = $content['services']['_defaults'];
         unset($content['services']['_defaults']);
 
-        if (!is_array($defaults)) {
-            throw new InvalidArgumentException(sprintf('Service "_defaults" key must be an array, "%s" given in "%s".', gettype($defaults), $file));
+        if (!\is_array($defaults)) {
+            throw new InvalidArgumentException(sprintf('Service "_defaults" key must be an array, "%s" given in "%s".', \gettype($defaults), $file));
         }
 
         foreach ($defaults as $key => $default) {
@@ -249,12 +249,12 @@ private function parseDefaults(array &$content, string $file): array
         }
 
         if (isset($defaults['tags'])) {
-            if (!is_array($tags = $defaults['tags'])) {
+            if (!\is_array($tags = $defaults['tags'])) {
                 throw new InvalidArgumentException(sprintf('Parameter "tags" in "_defaults" must be an array in %s. Check your YAML syntax.', $file));
             }
 
             foreach ($tags as $tag) {
-                if (!is_array($tag)) {
+                if (!\is_array($tag)) {
                     $tag = array('name' => $tag);
                 }
 
@@ -264,7 +264,7 @@ private function parseDefaults(array &$content, string $file): array
                 $name = $tag['name'];
                 unset($tag['name']);
 
-                if (!is_string($name) || '' === $name) {
+                if (!\is_string($name) || '' === $name) {
                     throw new InvalidArgumentException(sprintf('The tag name in "_defaults" must be a non-empty string in %s.', $file));
                 }
 
@@ -277,7 +277,7 @@ private function parseDefaults(array &$content, string $file): array
         }
 
         if (isset($defaults['bind'])) {
-            if (!is_array($defaults['bind'])) {
+            if (!\is_array($defaults['bind'])) {
                 throw new InvalidArgumentException(sprintf('Parameter "bind" in "_defaults" must be an array in %s. Check your YAML syntax.', $file));
             }
 
@@ -290,7 +290,7 @@ private function parseDefaults(array &$content, string $file): array
     private function isUsingShortSyntax(array $service): bool
     {
         foreach ($service as $key => $value) {
-            if (is_string($key) && ('' === $key || '$' !== $key[0])) {
+            if (\is_string($key) && ('' === $key || '$' !== $key[0])) {
                 return false;
             }
         }
@@ -314,7 +314,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
             throw new InvalidArgumentException(sprintf('Service names that start with an underscore are reserved. Rename the "%s" service or define it in XML instead.', $id));
         }
 
-        if (is_string($service) && 0 === strpos($service, '@')) {
+        if (\is_string($service) && 0 === strpos($service, '@')) {
             $this->container->setAlias($id, $alias = new Alias(substr($service, 1)));
             if (isset($defaults['public'])) {
                 $alias->setPublic($defaults['public']);
@@ -323,7 +323,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
             return;
         }
 
-        if (is_array($service) && $this->isUsingShortSyntax($service)) {
+        if (\is_array($service) && $this->isUsingShortSyntax($service)) {
             $service = array('arguments' => $service);
         }
 
@@ -331,8 +331,8 @@ private function parseDefinition($id, $service, $file, array $defaults)
             $service = array();
         }
 
-        if (!is_array($service)) {
-            throw new InvalidArgumentException(sprintf('A service definition must be an array or a string starting with "@" but %s found for service "%s" in %s. Check your YAML syntax.', gettype($service), $id, $file));
+        if (!\is_array($service)) {
+            throw new InvalidArgumentException(sprintf('A service definition must be an array or a string starting with "@" but %s found for service "%s" in %s. Check your YAML syntax.', \gettype($service), $id, $file));
         }
 
         $this->checkDefinition($id, $service, $file);
@@ -346,7 +346,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
             }
 
             foreach ($service as $key => $value) {
-                if (!in_array($key, array('alias', 'public'))) {
+                if (!\in_array($key, array('alias', 'public'))) {
                     throw new InvalidArgumentException(sprintf('The configuration key "%s" is unsupported for the service "%s" which is defined as an alias in "%s". Allowed configuration keys for service aliases are "alias" and "public".', $key, $id, $file));
                 }
             }
@@ -441,7 +441,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
         }
 
         if (isset($service['calls'])) {
-            if (!is_array($service['calls'])) {
+            if (!\is_array($service['calls'])) {
                 throw new InvalidArgumentException(sprintf('Parameter "calls" must be an array for service "%s" in %s. Check your YAML syntax.', $id, $file));
             }
 
@@ -454,7 +454,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
                     $args = isset($call[1]) ? $this->resolveServices($call[1], $file) : array();
                 }
 
-                if (!is_array($args)) {
+                if (!\is_array($args)) {
                     throw new InvalidArgumentException(sprintf('The second parameter for function call "%s" must be an array of its arguments for service "%s" in %s. Check your YAML syntax.', $method, $id, $file));
                 }
                 $definition->addMethodCall($method, $args);
@@ -462,7 +462,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
         }
 
         $tags = isset($service['tags']) ? $service['tags'] : array();
-        if (!is_array($tags)) {
+        if (!\is_array($tags)) {
             throw new InvalidArgumentException(sprintf('Parameter "tags" must be an array for service "%s" in %s. Check your YAML syntax.', $id, $file));
         }
 
@@ -471,7 +471,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
         }
 
         foreach ($tags as $tag) {
-            if (!is_array($tag)) {
+            if (!\is_array($tag)) {
                 $tag = array('name' => $tag);
             }
 
@@ -481,7 +481,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
             $name = $tag['name'];
             unset($tag['name']);
 
-            if (!is_string($name) || '' === $name) {
+            if (!\is_string($name) || '' === $name) {
                 throw new InvalidArgumentException(sprintf('The tag name for service "%s" in %s must be a non-empty string.', $id, $file));
             }
 
@@ -513,7 +513,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
             $bindings = isset($defaults['bind']) ? unserialize(serialize($defaults['bind'])) : array();
 
             if (isset($service['bind'])) {
-                if (!is_array($service['bind'])) {
+                if (!\is_array($service['bind'])) {
                     throw new InvalidArgumentException(sprintf('Parameter "bind" must be an array for service "%s" in %s. Check your YAML syntax.', $id, $file));
                 }
 
@@ -536,7 +536,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
         }
 
         if (array_key_exists('resource', $service)) {
-            if (!is_string($service['resource'])) {
+            if (!\is_string($service['resource'])) {
                 throw new InvalidArgumentException(sprintf('A "resource" attribute must be of type string for service "%s" in %s. Check your YAML syntax.', $id, $file));
             }
             $exclude = isset($service['exclude']) ? $service['exclude'] : null;
@@ -561,7 +561,7 @@ private function parseDefinition($id, $service, $file, array $defaults)
      */
     private function parseCallable($callable, $parameter, $id, $file)
     {
-        if (is_string($callable)) {
+        if (\is_string($callable)) {
             if ('' !== $callable && '@' === $callable[0]) {
                 throw new InvalidArgumentException(sprintf('The value of the "%s" option for the "%s" service must be the id of the service without the "@" prefix (replace "%s" with "%s").', $parameter, $id, $callable, substr($callable, 1)));
             }
@@ -575,7 +575,7 @@ private function parseCallable($callable, $parameter, $id, $file)
             return $callable;
         }
 
-        if (is_array($callable)) {
+        if (\is_array($callable)) {
             if (isset($callable[0]) && isset($callable[1])) {
                 return array($this->resolveServices($callable[0], $file), $callable[1]);
             }
@@ -642,12 +642,12 @@ private function validate($content, $file)
             return $content;
         }
 
-        if (!is_array($content)) {
+        if (!\is_array($content)) {
             throw new InvalidArgumentException(sprintf('The service file "%s" is not valid. It should contain an array. Check your YAML syntax.', $file));
         }
 
         foreach ($content as $namespace => $data) {
-            if (in_array($namespace, array('imports', 'parameters', 'services'))) {
+            if (\in_array($namespace, array('imports', 'parameters', 'services'))) {
                 continue;
             }
 
@@ -680,7 +680,7 @@ private function resolveServices($value, $file, $isParameter = false)
         if ($value instanceof TaggedValue) {
             $argument = $value->getValue();
             if ('iterator' === $value->getTag()) {
-                if (!is_array($argument)) {
+                if (!\is_array($argument)) {
                     throw new InvalidArgumentException(sprintf('"!iterator" tag only accepts sequences in "%s".', $file));
                 }
                 $argument = $this->resolveServices($argument, $file, $isParameter);
@@ -691,7 +691,7 @@ private function resolveServices($value, $file, $isParameter = false)
                 }
             }
             if ('tagged' === $value->getTag()) {
-                if (!is_string($argument) || !$argument) {
+                if (!\is_string($argument) || !$argument) {
                     throw new InvalidArgumentException(sprintf('"!tagged" tag only accepts non empty string in "%s".', $file));
                 }
 
@@ -725,17 +725,17 @@ private function resolveServices($value, $file, $isParameter = false)
             throw new InvalidArgumentException(sprintf('Unsupported tag "!%s".', $value->getTag()));
         }
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             foreach ($value as $k => $v) {
                 $value[$k] = $this->resolveServices($v, $file, $isParameter);
             }
-        } elseif (is_string($value) && 0 === strpos($value, '@=')) {
+        } elseif (\is_string($value) && 0 === strpos($value, '@=')) {
             if (!class_exists(Expression::class)) {
                 throw new \LogicException(sprintf('The "@=" expression syntax cannot be used without the ExpressionLanguage component. Try running "composer require symfony/expression-language".'));
             }
 
             return new Expression(substr($value, 2));
-        } elseif (is_string($value) && 0 === strpos($value, '@')) {
+        } elseif (\is_string($value) && 0 === strpos($value, '@')) {
             if (0 === strpos($value, '@@')) {
                 $value = substr($value, 1);
                 $invalidBehavior = null;
@@ -764,11 +764,11 @@ private function resolveServices($value, $file, $isParameter = false)
     private function loadFromExtensions(array $content)
     {
         foreach ($content as $namespace => $values) {
-            if (in_array($namespace, array('imports', 'parameters', 'services'))) {
+            if (\in_array($namespace, array('imports', 'parameters', 'services'))) {
                 continue;
             }
 
-            if (!is_array($values) && null !== $values) {
+            if (!\is_array($values) && null !== $values) {
                 $values = array();
             }
 
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php b/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
index ddc7e84fa636..12bc7612f9f0 100644
--- a/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
+++ b/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\ParameterBag;
 
-use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**
  * @author Nicolas Grekas <p@tchwork.com>
@@ -43,7 +43,7 @@ public function get($name)
                 $defaultValue = parent::get($name);
 
                 if (null !== $defaultValue && !is_scalar($defaultValue)) {
-                    throw new RuntimeException(sprintf('The default value of an env() parameter must be scalar or null, but "%s" given to "%s".', gettype($defaultValue), $name));
+                    throw new RuntimeException(sprintf('The default value of an env() parameter must be scalar or null, but "%s" given to "%s".', \gettype($defaultValue), $name));
                 }
             }
 
@@ -116,7 +116,7 @@ public function resolve()
             if (is_numeric($default = $this->parameters[$name])) {
                 $this->parameters[$name] = (string) $default;
             } elseif (null !== $default && !is_scalar($default)) {
-                throw new RuntimeException(sprintf('The default value of env parameter "%s" must be scalar or null, %s given.', $env, gettype($default)));
+                throw new RuntimeException(sprintf('The default value of env parameter "%s" must be scalar or null, %s given.', $env, \gettype($default)));
             }
         }
     }
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
index dc5a4be29219..91f61b68fdd9 100644
--- a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
+++ b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\ParameterBag;
 
-use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\ParameterCircularReferenceException;
+use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**
@@ -76,18 +76,18 @@ public function get($name)
             $alternatives = array();
             foreach ($this->parameters as $key => $parameterValue) {
                 $lev = levenshtein($name, $key);
-                if ($lev <= strlen($name) / 3 || false !== strpos($key, $name)) {
+                if ($lev <= \strlen($name) / 3 || false !== strpos($key, $name)) {
                     $alternatives[] = $key;
                 }
             }
 
             $nonNestedAlternative = null;
-            if (!count($alternatives) && false !== strpos($name, '.')) {
+            if (!\count($alternatives) && false !== strpos($name, '.')) {
                 $namePartsLength = array_map('strlen', explode('.', $name));
                 $key = substr($name, 0, -1 * (1 + array_pop($namePartsLength)));
-                while (count($namePartsLength)) {
+                while (\count($namePartsLength)) {
                     if ($this->has($key)) {
-                        if (is_array($this->get($key))) {
+                        if (\is_array($this->get($key))) {
                             $nonNestedAlternative = $key;
                         }
                         break;
@@ -229,8 +229,8 @@ public function resolveString($value, array $resolving = array())
 
             $resolved = $this->get($key);
 
-            if (!is_string($resolved) && !is_numeric($resolved)) {
-                throw new RuntimeException(sprintf('A string value must be composed of strings and/or numbers, but found parameter "%s" of type %s inside string value "%s".', $key, gettype($resolved), $value));
+            if (!\is_string($resolved) && !is_numeric($resolved)) {
+                throw new RuntimeException(sprintf('A string value must be composed of strings and/or numbers, but found parameter "%s" of type %s inside string value "%s".', $key, \gettype($resolved), $value));
             }
 
             $resolved = (string) $resolved;
@@ -250,11 +250,11 @@ public function isResolved()
      */
     public function escapeValue($value)
     {
-        if (is_string($value)) {
+        if (\is_string($value)) {
             return str_replace('%', '%%', $value);
         }
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             $result = array();
             foreach ($value as $k => $v) {
                 $result[$k] = $this->escapeValue($v);
@@ -271,11 +271,11 @@ public function escapeValue($value)
      */
     public function unescapeValue($value)
     {
-        if (is_string($value)) {
+        if (\is_string($value)) {
             return str_replace('%%', '%', $value);
         }
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             $result = array();
             foreach ($value as $k => $v) {
                 $result[$k] = $this->unescapeValue($v);
diff --git a/src/Symfony/Component/DependencyInjection/ServiceLocator.php b/src/Symfony/Component/DependencyInjection/ServiceLocator.php
index 324cccab9891..bdedc88e8b6c 100644
--- a/src/Symfony/Component/DependencyInjection/ServiceLocator.php
+++ b/src/Symfony/Component/DependencyInjection/ServiceLocator.php
@@ -53,7 +53,7 @@ public function get($id)
 
         if (isset($this->loading[$id])) {
             $ids = array_values($this->loading);
-            $ids = array_slice($this->loading, array_search($id, $ids));
+            $ids = \array_slice($this->loading, array_search($id, $ids));
             $ids[] = $id;
 
             throw new ServiceCircularReferenceException($id, $ids);
@@ -91,7 +91,7 @@ private function createServiceNotFoundMessage($id)
         }
 
         $class = debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT | DEBUG_BACKTRACE_IGNORE_ARGS, 3);
-        $class = isset($class[2]['object']) ? get_class($class[2]['object']) : null;
+        $class = isset($class[2]['object']) ? \get_class($class[2]['object']) : null;
         $externalId = $this->externalId ?: $class;
 
         $msg = sprintf('Service "%s" not found: ', $id);
@@ -136,7 +136,7 @@ private function formatAlternatives(array $alternatives = null, $separator = 'an
             if (!$alternatives = array_keys($this->factories)) {
                 return 'is empty...';
             }
-            $format = sprintf('only knows about the %s service%s.', $format, 1 < count($alternatives) ? 's' : '');
+            $format = sprintf('only knows about the %s service%s.', $format, 1 < \count($alternatives) ? 's' : '');
         }
         $last = array_pop($alternatives);
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Argument/RewindableGeneratorTest.php b/src/Symfony/Component/DependencyInjection/Tests/Argument/RewindableGeneratorTest.php
index 1415869a4f1e..31e3f11fec35 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Argument/RewindableGeneratorTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Argument/RewindableGeneratorTest.php
@@ -46,7 +46,7 @@ public function testCountUsesProvidedValueAsCallback()
         $this->assertSame(0, $called, 'Count callback is called lazily');
         $this->assertCount(3, $generator);
 
-        count($generator);
+        \count($generator);
 
         $this->assertSame(1, $called, 'Count callback is called only once');
     }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AnalyzeServiceReferencesPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AnalyzeServiceReferencesPassTest.php
index 7a06e10d9ffa..8d44fad8611e 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AnalyzeServiceReferencesPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AnalyzeServiceReferencesPassTest.php
@@ -13,11 +13,11 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
-use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Compiler\AnalyzeServiceReferencesPass;
 use Symfony\Component\DependencyInjection\Compiler\RepeatedPass;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Reference;
 
 class AnalyzeServiceReferencesPassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
index 9e51b65eed64..45988247d7a5 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Config\FileLocator;
-use Symfony\Component\DependencyInjection\Compiler\AutowireRequiredMethodsPass;
 use Symfony\Component\DependencyInjection\Compiler\AutowirePass;
+use Symfony\Component\DependencyInjection\Compiler\AutowireRequiredMethodsPass;
 use Symfony\Component\DependencyInjection\Compiler\ResolveClassPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\AutowiringFailedException;
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowireRequiredMethodsPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowireRequiredMethodsPassTest.php
index 3b067150ff5a..07c9f9d774e3 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowireRequiredMethodsPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowireRequiredMethodsPassTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\Compiler\ResolveClassPass;
 use Symfony\Component\DependencyInjection\Compiler\AutowireRequiredMethodsPass;
+use Symfony\Component\DependencyInjection\Compiler\ResolveClassPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 require_once __DIR__.'/../Fixtures/includes/autowiring_classes.php';
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckCircularReferencesPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckCircularReferencesPassTest.php
index e8a526e722ae..a87dc44a9cb2 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckCircularReferencesPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckCircularReferencesPassTest.php
@@ -13,11 +13,11 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\Compiler\CheckCircularReferencesPass;
 use Symfony\Component\DependencyInjection\Compiler\AnalyzeServiceReferencesPass;
+use Symfony\Component\DependencyInjection\Compiler\CheckCircularReferencesPass;
 use Symfony\Component\DependencyInjection\Compiler\Compiler;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 
 class CheckCircularReferencesPassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckExceptionOnInvalidReferenceBehaviorPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckExceptionOnInvalidReferenceBehaviorPassTest.php
index a3fbfcf10132..631c344ff6cb 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckExceptionOnInvalidReferenceBehaviorPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckExceptionOnInvalidReferenceBehaviorPassTest.php
@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Argument\BoundArgument;
-use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Compiler\CheckExceptionOnInvalidReferenceBehaviorPass;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Reference;
 
 class CheckExceptionOnInvalidReferenceBehaviorPassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckReferenceValidityPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckReferenceValidityPassTest.php
index 231520cd70c0..22b6fd1542e7 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckReferenceValidityPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/CheckReferenceValidityPassTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Compiler\CheckReferenceValidityPass;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 
 class CheckReferenceValidityPassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php
index 8c51df86f681..24c26952559d 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Alias;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\DecoratorServicePass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class DecoratorServicePassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/InlineServiceDefinitionsPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/InlineServiceDefinitionsPassTest.php
index 78556b2ed21c..2db0aaa127d2 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/InlineServiceDefinitionsPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/InlineServiceDefinitionsPassTest.php
@@ -12,14 +12,14 @@
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
+use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
 use Symfony\Component\DependencyInjection\Compiler\AnalyzeServiceReferencesPass;
-use Symfony\Component\DependencyInjection\Compiler\RepeatedPass;
 use Symfony\Component\DependencyInjection\Compiler\InlineServiceDefinitionsPass;
-use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\Compiler\RepeatedPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
-use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Reference;
 
 class InlineServiceDefinitionsPassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/IntegrationTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/IntegrationTest.php
index c1e2413d75b4..6695abfaf260 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/IntegrationTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/IntegrationTest.php
@@ -14,9 +14,9 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Alias;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * This class tests the integration of the different compiler passes.
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/MergeExtensionConfigurationPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/MergeExtensionConfigurationPassTest.php
index 77872720aa4f..3ebd3f5e5c98 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/MergeExtensionConfigurationPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/MergeExtensionConfigurationPassTest.php
@@ -15,8 +15,8 @@
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\Resource\FileResource;
-use Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass;
 use Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/PassConfigTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/PassConfigTest.php
index d9444ca89cf3..1fd772ee690e 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/PassConfigTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/PassConfigTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\Compiler\PassConfig;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\Compiler\PassConfig;
 
 /**
  * @author Guilhem N <egetick@gmail.com>
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/RemoveUnusedDefinitionsPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/RemoveUnusedDefinitionsPassTest.php
index c6f4e5e79d64..fd26561a247f 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/RemoveUnusedDefinitionsPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/RemoveUnusedDefinitionsPassTest.php
@@ -13,12 +13,12 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Compiler\AnalyzeServiceReferencesPass;
-use Symfony\Component\DependencyInjection\Compiler\RepeatedPass;
 use Symfony\Component\DependencyInjection\Compiler\RemoveUnusedDefinitionsPass;
+use Symfony\Component\DependencyInjection\Compiler\RepeatedPass;
 use Symfony\Component\DependencyInjection\Compiler\ResolveParameterPlaceHoldersPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class RemoveUnusedDefinitionsPassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveBindingsPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveBindingsPassTest.php
index 65f5ceb80fd0..d59b95af5c40 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveBindingsPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveBindingsPassTest.php
@@ -17,9 +17,9 @@
 use Symfony\Component\DependencyInjection\Compiler\ResolveBindingsPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\CaseSensitiveClass;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\NamedArgumentsDummy;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\ParentNotExists;
-use Symfony\Component\DependencyInjection\Tests\Fixtures\CaseSensitiveClass;
 use Symfony\Component\DependencyInjection\TypedReference;
 
 require_once __DIR__.'/../Fixtures/includes/autowiring_classes.php';
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveChildDefinitionsPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveChildDefinitionsPassTest.php
index e633f843198f..cf011b43e3b8 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveChildDefinitionsPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveChildDefinitionsPassTest.php
@@ -259,23 +259,23 @@ public function testDeepDefinitionsResolving()
         $this->process($container);
 
         $configurator = $container->getDefinition('sibling')->getConfigurator();
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($configurator));
+        $this->assertSame('Symfony\Component\DependencyInjection\Definition', \get_class($configurator));
         $this->assertSame('parentClass', $configurator->getClass());
 
         $factory = $container->getDefinition('sibling')->getFactory();
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($factory[0]));
+        $this->assertSame('Symfony\Component\DependencyInjection\Definition', \get_class($factory[0]));
         $this->assertSame('parentClass', $factory[0]->getClass());
 
         $argument = $container->getDefinition('sibling')->getArgument(0);
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($argument));
+        $this->assertSame('Symfony\Component\DependencyInjection\Definition', \get_class($argument));
         $this->assertSame('parentClass', $argument->getClass());
 
         $properties = $container->getDefinition('sibling')->getProperties();
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($properties['prop']));
+        $this->assertSame('Symfony\Component\DependencyInjection\Definition', \get_class($properties['prop']));
         $this->assertSame('parentClass', $properties['prop']->getClass());
 
         $methodCalls = $container->getDefinition('sibling')->getMethodCalls();
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($methodCalls[0][1][0]));
+        $this->assertSame('Symfony\Component\DependencyInjection\Definition', \get_class($methodCalls[0][1][0]));
         $this->assertSame('parentClass', $methodCalls[0][1][0]->getClass());
     }
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveInstanceofConditionalsPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveInstanceofConditionalsPassTest.php
index 39078dbaf657..ad6f79d4051b 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveInstanceofConditionalsPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveInstanceofConditionalsPassTest.php
@@ -14,8 +14,8 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Argument\BoundArgument;
 use Symfony\Component\DependencyInjection\ChildDefinition;
-use Symfony\Component\DependencyInjection\Compiler\ResolveInstanceofConditionalsPass;
 use Symfony\Component\DependencyInjection\Compiler\ResolveChildDefinitionsPass;
+use Symfony\Component\DependencyInjection\Compiler\ResolveInstanceofConditionalsPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class ResolveInstanceofConditionalsPassTest extends TestCase
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveInvalidReferencesPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveInvalidReferencesPassTest.php
index 00613ba5c1c6..61bad48a5466 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveInvalidReferencesPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveInvalidReferencesPassTest.php
@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
-use Symfony\Component\DependencyInjection\ContainerInterface;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Compiler\ResolveInvalidReferencesPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Reference;
 
 class ResolveInvalidReferencesPassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveReferencesToAliasesPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveReferencesToAliasesPassTest.php
index c22ab59ea9b9..6fb619718a64 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveReferencesToAliasesPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveReferencesToAliasesPassTest.php
@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Alias;
-use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Compiler\ResolveReferencesToAliasesPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Reference;
 
 class ResolveReferencesToAliasesPassTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php b/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
index 8890ed66d386..ccc5c6cb75fa 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php
@@ -17,8 +17,9 @@
 use PHPUnit\Framework\TestCase;
 use Psr\Container\ContainerInterface as PsrContainerInterface;
 use Symfony\Component\Config\Resource\ComposerResource;
-use Symfony\Component\Config\Resource\ResourceInterface;
 use Symfony\Component\Config\Resource\DirectoryResource;
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Config\Resource\ResourceInterface;
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
@@ -31,15 +32,14 @@
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 use Symfony\Component\DependencyInjection\Loader\ClosureLoader;
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\Tests\Fixtures\SimilarArgumentsDummy;
-use Symfony\Component\DependencyInjection\TypedReference;
-use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag;
-use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceLocator;
-use Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\CaseSensitiveClass;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\SimilarArgumentsDummy;
+use Symfony\Component\DependencyInjection\TypedReference;
 use Symfony\Component\ExpressionLanguage\Expression;
 
 class ContainerBuilderTest extends TestCase
@@ -333,7 +333,7 @@ public function testAddGetCompilerPass()
         $builder->addCompilerPass($pass2 = $this->getMockBuilder('Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface')->getMock(), PassConfig::TYPE_BEFORE_OPTIMIZATION, 10);
 
         $passes = $builder->getCompiler()->getPassConfig()->getPasses();
-        $this->assertCount(count($passes) - 2, $defaultPasses);
+        $this->assertCount(\count($passes) - 2, $defaultPasses);
         // Pass 1 is executed later
         $this->assertTrue(array_search($pass1, $passes, true) > array_search($pass2, $passes, true));
     }
@@ -358,7 +358,7 @@ public function testCreateProxyWithRealServiceInstantiator()
         $foo1 = $builder->get('foo1');
 
         $this->assertSame($foo1, $builder->get('foo1'), 'The same proxy is retrieved on multiple subsequent calls');
-        $this->assertSame('Bar\FooClass', get_class($foo1));
+        $this->assertSame('Bar\FooClass', \get_class($foo1));
     }
 
     public function testCreateServiceClass()
@@ -972,7 +972,7 @@ public function testFileExists()
         $A = new ComposerResource();
         $a = new FileResource(__DIR__.'/Fixtures/xml/services1.xml');
         $b = new FileResource(__DIR__.'/Fixtures/xml/services2.xml');
-        $c = new DirectoryResource($dir = dirname($b));
+        $c = new DirectoryResource($dir = \dirname($b));
 
         $this->assertTrue($container->fileExists((string) $a) && $container->fileExists((string) $b) && $container->fileExists($dir));
 
@@ -1238,6 +1238,30 @@ public function testNoClassFromGlobalNamespaceClassId()
         $container->compile();
     }
 
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
+     * @expectedExceptionMessage The definition for "\DateTime" has no class attribute, and appears to reference a class or interface in the global namespace.
+     */
+    public function testNoClassFromGlobalNamespaceClassIdWithLeadingSlash()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('\\'.\DateTime::class);
+        $container->compile();
+    }
+
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
+     * @expectedExceptionMessage The definition for "\Symfony\Component\DependencyInjection\Tests\FooClass" has no class attribute, and appears to reference a class or interface. Please specify the class attribute explicitly or remove the leading backslash by renaming the service to "Symfony\Component\DependencyInjection\Tests\FooClass" to get rid of this error.
+     */
+    public function testNoClassFromNamespaceClassIdWithLeadingSlash()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('\\'.FooClass::class);
+        $container->compile();
+    }
+
     /**
      * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
      * @expectedExceptionMessage The definition for "123_abc" has no class.
diff --git a/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php b/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
index 2ad4ac34fab0..af5fa0c680cb 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
@@ -15,8 +15,8 @@
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 
 class ContainerTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/CrossCheckTest.php b/src/Symfony/Component/DependencyInjection/Tests/CrossCheckTest.php
index dbdbb7954231..c15104c66d04 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/CrossCheckTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/CrossCheckTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\DependencyInjection\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class CrossCheckTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
index 1ff1c75cdf52..ffdc1a0f5556 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
@@ -19,18 +19,18 @@
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface as SymfonyContainerInterface;
+use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Dumper\PhpDumper;
 use Symfony\Component\DependencyInjection\EnvVarProcessorInterface;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\Parameter;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\Tests\Fixtures\StubbedTranslator;
-use Symfony\Component\DependencyInjection\TypedReference;
-use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\ServiceLocator;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\StubbedTranslator;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber;
+use Symfony\Component\DependencyInjection\TypedReference;
 use Symfony\Component\DependencyInjection\Variable;
 use Symfony\Component\ExpressionLanguage\Expression;
 
@@ -95,10 +95,10 @@ public function testDumpRelativeDir()
 
         $container = new ContainerBuilder();
         $container->setDefinition('test', $definition);
-        $container->setParameter('foo', 'wiz'.dirname(__DIR__));
+        $container->setParameter('foo', 'wiz'.\dirname(__DIR__));
         $container->setParameter('bar', __DIR__);
         $container->setParameter('baz', '%bar%/PhpDumperTest.php');
-        $container->setParameter('buz', dirname(dirname(__DIR__)));
+        $container->setParameter('buz', \dirname(\dirname(__DIR__)));
         $container->compile();
 
         $dumper = new PhpDumper($container);
@@ -190,7 +190,7 @@ public function testAddService()
         $container = include self::$fixturesPath.'/containers/container9.php';
         $container->compile();
         $dumper = new PhpDumper($container);
-        $this->assertStringEqualsFile(self::$fixturesPath.'/php/services9_compiled.php', str_replace(str_replace('\\', '\\\\', self::$fixturesPath.DIRECTORY_SEPARATOR.'includes'.DIRECTORY_SEPARATOR), '%path%', $dumper->dump()), '->dump() dumps services');
+        $this->assertStringEqualsFile(self::$fixturesPath.'/php/services9_compiled.php', str_replace(str_replace('\\', '\\\\', self::$fixturesPath.\DIRECTORY_SEPARATOR.'includes'.\DIRECTORY_SEPARATOR), '%path%', $dumper->dump()), '->dump() dumps services');
 
         $container = new ContainerBuilder();
         $container->register('foo', 'FooClass')->addArgument(new \stdClass())->setPublic(true);
@@ -212,7 +212,7 @@ public function testDumpAsFiles()
         $container->compile();
         $dumper = new PhpDumper($container);
         $dump = print_r($dumper->dump(array('as_files' => true, 'file' => __DIR__, 'hot_path_tag' => 'hot')), true);
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $dump = str_replace('\\\\Fixtures\\\\includes\\\\foo.php', '/Fixtures/includes/foo.php', $dump);
         }
         $this->assertStringMatchesFormatFile(self::$fixturesPath.'/php/services9_as_files.txt', $dump);
@@ -865,7 +865,7 @@ public function testHotPathOptimizations()
         $dumper = new PhpDumper($container);
 
         $dump = $dumper->dump(array('hot_path_tag' => 'container.hot_path', 'inline_class_loader_parameter' => 'inline_requires', 'file' => self::$fixturesPath.'/php/services_inline_requires.php'));
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $dump = str_replace("'\\\\includes\\\\HotPath\\\\", "'/includes/HotPath/", $dump);
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Dumper/XmlDumperTest.php b/src/Symfony/Component/DependencyInjection/Tests/Dumper/XmlDumperTest.php
index 2e4ccf1fdbe4..f33b3b8d7073 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Dumper/XmlDumperTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Dumper/XmlDumperTest.php
@@ -54,7 +54,7 @@ public function testAddService()
         $container = include self::$fixturesPath.'/containers/container9.php';
         $dumper = new XmlDumper($container);
 
-        $this->assertEquals(str_replace('%path%', self::$fixturesPath.DIRECTORY_SEPARATOR.'includes'.DIRECTORY_SEPARATOR, file_get_contents(self::$fixturesPath.'/xml/services9.xml')), $dumper->dump(), '->dump() dumps services');
+        $this->assertEquals(str_replace('%path%', self::$fixturesPath.\DIRECTORY_SEPARATOR.'includes'.\DIRECTORY_SEPARATOR, file_get_contents(self::$fixturesPath.'/xml/services9.xml')), $dumper->dump(), '->dump() dumps services');
 
         $dumper = new XmlDumper($container = new ContainerBuilder());
         $container->register('foo', 'FooClass')->addArgument(new \stdClass())->setPublic(true);
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Dumper/YamlDumperTest.php b/src/Symfony/Component/DependencyInjection/Tests/Dumper/YamlDumperTest.php
index 2a34692c5862..ff2239fb64d6 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Dumper/YamlDumperTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Dumper/YamlDumperTest.php
@@ -19,8 +19,8 @@
 use Symfony\Component\DependencyInjection\Dumper\YamlDumper;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\Yaml\Yaml;
 use Symfony\Component\Yaml\Parser;
+use Symfony\Component\Yaml\Yaml;
 
 class YamlDumperTest extends TestCase
 {
@@ -49,7 +49,7 @@ public function testAddService()
     {
         $container = include self::$fixturesPath.'/containers/container9.php';
         $dumper = new YamlDumper($container);
-        $this->assertEqualYamlStructure(str_replace('%path%', self::$fixturesPath.DIRECTORY_SEPARATOR.'includes'.DIRECTORY_SEPARATOR, file_get_contents(self::$fixturesPath.'/yaml/services9.yml')), $dumper->dump(), '->dump() dumps services');
+        $this->assertEqualYamlStructure(str_replace('%path%', self::$fixturesPath.\DIRECTORY_SEPARATOR.'includes'.\DIRECTORY_SEPARATOR, file_get_contents(self::$fixturesPath.'/yaml/services9.yml')), $dumper->dump(), '->dump() dumps services');
 
         $dumper = new YamlDumper($container = new ContainerBuilder());
         $container->register('foo', 'FooClass')->addArgument(new \stdClass())->setPublic(true);
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/DirectoryLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/DirectoryLoaderTest.php
index 5de6577371b4..559abbe25b81 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/DirectoryLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/DirectoryLoaderTest.php
@@ -12,13 +12,13 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
+use Symfony\Component\DependencyInjection\Loader\DirectoryLoader;
 use Symfony\Component\DependencyInjection\Loader\IniFileLoader;
+use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
-use Symfony\Component\DependencyInjection\Loader\DirectoryLoader;
-use Symfony\Component\Config\Loader\LoaderResolver;
-use Symfony\Component\Config\FileLocator;
 
 class DirectoryLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
index 8a271a818a47..73015084ab49 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
-use Psr\Container\ContainerInterface as PsrContainerInterface;
 use PHPUnit\Framework\TestCase;
+use Psr\Container\ContainerInterface as PsrContainerInterface;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -26,10 +26,10 @@
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\BadClasses\MissingParent;
-use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\OtherDir\AnotherSub\DeeperBaz;
-use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\OtherDir\Baz;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Foo;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\FooInterface;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\OtherDir\AnotherSub\DeeperBaz;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\OtherDir\Baz;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Sub\Bar;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Sub\BarInterface;
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/GlobFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/GlobFileLoaderTest.php
index a3be4dfd3b99..74822f551859 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/GlobFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/GlobFileLoaderTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Resource\GlobResource;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\GlobFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class GlobFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/IniFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/IniFileLoaderTest.php
index 84c934c08614..cb124bcc898c 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/IniFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/IniFileLoaderTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\IniFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class IniFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/PhpFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/PhpFileLoaderTest.php
index 4d8f300cd9b5..e0b7a269982c 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/PhpFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/PhpFileLoaderTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Dumper\PhpDumper;
 use Symfony\Component\DependencyInjection\Dumper\YamlDumper;
 use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
-use Symfony\Component\Config\FileLocator;
 
 class PhpFileLoaderTest extends TestCase
 {
@@ -46,7 +46,7 @@ public function testConfigServices()
 
         $container->compile();
         $dumper = new PhpDumper($container);
-        $this->assertStringEqualsFile($fixtures.'/php/services9_compiled.php', str_replace(str_replace('\\', '\\\\', $fixtures.DIRECTORY_SEPARATOR.'includes'.DIRECTORY_SEPARATOR), '%path%', $dumper->dump()));
+        $this->assertStringEqualsFile($fixtures.'/php/services9_compiled.php', str_replace(str_replace('\\', '\\\\', $fixtures.\DIRECTORY_SEPARATOR.'includes'.\DIRECTORY_SEPARATOR), '%path%', $dumper->dump()));
     }
 
     /**
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
index fb80cd49360f..bd3fc5199e83 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
@@ -12,21 +12,21 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\Config\Loader\LoaderResolver;
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Config\Resource\GlobResource;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\Loader\IniFileLoader;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
-use Symfony\Component\DependencyInjection\Loader\IniFileLoader;
-use Symfony\Component\Config\Loader\LoaderResolver;
-use Symfony\Component\Config\FileLocator;
-use Symfony\Component\Config\Resource\FileResource;
-use Symfony\Component\Config\Resource\GlobResource;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Bar;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\BarInterface;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\CaseSensitiveClass;
-use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\NamedArgumentsDummy;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype;
 use Symfony\Component\ExpressionLanguage\Expression;
 
 class XmlFileLoaderTest extends TestCase
@@ -445,7 +445,7 @@ public function testExtensions()
 
     public function testExtensionInPhar()
     {
-        if (extension_loaded('suhosin') && false === strpos(ini_get('suhosin.executor.include.whitelist'), 'phar')) {
+        if (\extension_loaded('suhosin') && false === strpos(ini_get('suhosin.executor.include.whitelist'), 'phar')) {
             $this->markTestSkipped('To run this test, add "phar" to the "suhosin.executor.include.whitelist" settings in your php.ini file.');
         }
 
@@ -608,8 +608,8 @@ public function testPrototype()
 
         $resources = $container->getResources();
 
-        $fixturesDir = dirname(__DIR__).DIRECTORY_SEPARATOR.'Fixtures'.DIRECTORY_SEPARATOR;
-        $this->assertTrue(false !== array_search(new FileResource($fixturesDir.'xml'.DIRECTORY_SEPARATOR.'services_prototype.xml'), $resources));
+        $fixturesDir = \dirname(__DIR__).\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR;
+        $this->assertTrue(false !== array_search(new FileResource($fixturesDir.'xml'.\DIRECTORY_SEPARATOR.'services_prototype.xml'), $resources));
         $this->assertTrue(false !== array_search(new GlobResource($fixturesDir.'Prototype', '/*', true), $resources));
         $resources = array_map('strval', $resources);
         $this->assertContains('reflection.Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Foo', $resources);
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php
index df625bb0131b..62cf3a69ea29 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php
@@ -12,22 +12,22 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\Config\Loader\LoaderResolver;
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Config\Resource\GlobResource;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
-use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\Loader\IniFileLoader;
 use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
-use Symfony\Component\Config\Loader\LoaderResolver;
-use Symfony\Component\Config\FileLocator;
-use Symfony\Component\Config\Resource\FileResource;
-use Symfony\Component\Config\Resource\GlobResource;
+use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Bar;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\BarInterface;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\CaseSensitiveClass;
-use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\NamedArgumentsDummy;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype;
 use Symfony\Component\ExpressionLanguage\Expression;
 
 class YamlFileLoaderTest extends TestCase
@@ -362,8 +362,8 @@ public function testPrototype()
 
         $resources = $container->getResources();
 
-        $fixturesDir = dirname(__DIR__).DIRECTORY_SEPARATOR.'Fixtures'.DIRECTORY_SEPARATOR;
-        $this->assertTrue(false !== array_search(new FileResource($fixturesDir.'yaml'.DIRECTORY_SEPARATOR.'services_prototype.yml'), $resources));
+        $fixturesDir = \dirname(__DIR__).\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR;
+        $this->assertTrue(false !== array_search(new FileResource($fixturesDir.'yaml'.\DIRECTORY_SEPARATOR.'services_prototype.yml'), $resources));
         $this->assertTrue(false !== array_search(new GlobResource($fixturesDir.'Prototype', '', true), $resources));
         $resources = array_map('strval', $resources);
         $this->assertContains('reflection.Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Foo', $resources);
diff --git a/src/Symfony/Component/DependencyInjection/Tests/ParameterBag/ParameterBagTest.php b/src/Symfony/Component/DependencyInjection/Tests/ParameterBag/ParameterBagTest.php
index c53decf8f017..3d79742ef465 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/ParameterBag/ParameterBagTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/ParameterBag/ParameterBagTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\DependencyInjection\Tests\ParameterBag;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
-use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\ParameterCircularReferenceException;
+use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 
 class ParameterBagTest extends TestCase
 {
diff --git a/src/Symfony/Component/DomCrawler/AbstractUriElement.php b/src/Symfony/Component/DomCrawler/AbstractUriElement.php
index b477c7142269..39ae522fd178 100644
--- a/src/Symfony/Component/DomCrawler/AbstractUriElement.php
+++ b/src/Symfony/Component/DomCrawler/AbstractUriElement.php
@@ -42,7 +42,7 @@ abstract class AbstractUriElement
      */
     public function __construct(\DOMElement $node, string $currentUri, ?string $method = 'GET')
     {
-        if (!in_array(strtolower(substr($currentUri, 0, 4)), array('http', 'file'))) {
+        if (!\in_array(strtolower(substr($currentUri, 0, 4)), array('http', 'file'))) {
             throw new \InvalidArgumentException(sprintf('Current URI must be an absolute URL ("%s").', $currentUri));
         }
 
@@ -114,7 +114,7 @@ public function getUri()
         }
 
         // relative path
-        $path = parse_url(substr($this->currentUri, strlen($baseUri)), PHP_URL_PATH);
+        $path = parse_url(substr($this->currentUri, \strlen($baseUri)), PHP_URL_PATH);
         $path = $this->canonicalizePath(substr($path, 0, strrpos($path, '/')).'/'.$uri);
 
         return $baseUri.('' === $path || '/' !== $path[0] ? '/' : '').$path;
diff --git a/src/Symfony/Component/DomCrawler/Crawler.php b/src/Symfony/Component/DomCrawler/Crawler.php
index 500c17f900e1..1d2dbe796a35 100644
--- a/src/Symfony/Component/DomCrawler/Crawler.php
+++ b/src/Symfony/Component/DomCrawler/Crawler.php
@@ -112,12 +112,12 @@ public function add($node)
             $this->addNodeList($node);
         } elseif ($node instanceof \DOMNode) {
             $this->addNode($node);
-        } elseif (is_array($node)) {
+        } elseif (\is_array($node)) {
             $this->addNodes($node);
-        } elseif (is_string($node)) {
+        } elseif (\is_string($node)) {
             $this->addContent($node);
         } elseif (null !== $node) {
-            throw new \InvalidArgumentException(sprintf('Expecting a DOMNodeList or DOMNode instance, an array, a string, or null, but got "%s".', is_object($node) ? get_class($node) : gettype($node)));
+            throw new \InvalidArgumentException(sprintf('Expecting a DOMNodeList or DOMNode instance, an array, a string, or null, but got "%s".', \is_object($node) ? \get_class($node) : \gettype($node)));
         }
     }
 
@@ -211,7 +211,7 @@ public function addHtmlContent($content, $charset = 'UTF-8')
         $base = $this->filterRelativeXPath('descendant-or-self::base')->extract(array('href'));
 
         $baseHref = current($base);
-        if (count($base) && !empty($baseHref)) {
+        if (\count($base) && !empty($baseHref)) {
             if ($this->baseHref) {
                 $linkNode = $dom->createElement('a');
                 $linkNode->setAttribute('href', $baseHref);
@@ -322,7 +322,7 @@ public function addNode(\DOMNode $node)
         }
 
         // Don't add duplicate nodes in the Crawler
-        if (in_array($node, $this->nodes, true)) {
+        if (\in_array($node, $this->nodes, true)) {
             return;
         }
 
@@ -381,7 +381,7 @@ public function each(\Closure $closure)
      */
     public function slice($offset = 0, $length = null)
     {
-        return $this->createSubCrawler(array_slice($this->nodes, $offset, $length));
+        return $this->createSubCrawler(\array_slice($this->nodes, $offset, $length));
     }
 
     /**
@@ -422,7 +422,7 @@ public function first()
      */
     public function last()
     {
-        return $this->eq(count($this->nodes) - 1);
+        return $this->eq(\count($this->nodes) - 1);
     }
 
     /**
@@ -635,7 +635,7 @@ public function evaluate($xpath)
     public function extract($attributes)
     {
         $attributes = (array) $attributes;
-        $count = count($attributes);
+        $count = \count($attributes);
 
         $data = array();
         foreach ($this->nodes as $node) {
@@ -765,7 +765,7 @@ public function link($method = 'get')
         $node = $this->getNode(0);
 
         if (!$node instanceof \DOMElement) {
-            throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', get_class($node)));
+            throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', \get_class($node)));
         }
 
         return new Link($node, $this->baseHref, $method);
@@ -783,7 +783,7 @@ public function links()
         $links = array();
         foreach ($this->nodes as $node) {
             if (!$node instanceof \DOMElement) {
-                throw new \InvalidArgumentException(sprintf('The current node list should contain only DOMElement instances, "%s" found.', get_class($node)));
+                throw new \InvalidArgumentException(sprintf('The current node list should contain only DOMElement instances, "%s" found.', \get_class($node)));
             }
 
             $links[] = new Link($node, $this->baseHref, 'get');
@@ -801,14 +801,14 @@ public function links()
      */
     public function image()
     {
-        if (!count($this)) {
+        if (!\count($this)) {
             throw new \InvalidArgumentException('The current node list is empty.');
         }
 
         $node = $this->getNode(0);
 
         if (!$node instanceof \DOMElement) {
-            throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', get_class($node)));
+            throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', \get_class($node)));
         }
 
         return new Image($node, $this->baseHref);
@@ -824,7 +824,7 @@ public function images()
         $images = array();
         foreach ($this as $node) {
             if (!$node instanceof \DOMElement) {
-                throw new \InvalidArgumentException(sprintf('The current node list should contain only DOMElement instances, "%s" found.', get_class($node)));
+                throw new \InvalidArgumentException(sprintf('The current node list should contain only DOMElement instances, "%s" found.', \get_class($node)));
             }
 
             $images[] = new Image($node, $this->baseHref);
@@ -852,7 +852,7 @@ public function form(array $values = null, $method = null)
         $node = $this->getNode(0);
 
         if (!$node instanceof \DOMElement) {
-            throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', get_class($node)));
+            throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', \get_class($node)));
         }
 
         $form = new Form($node, $this->uri, $method, $this->baseHref);
@@ -967,7 +967,7 @@ private function relativize(string $xpath): string
         // We cannot simply drop
         $nonMatchingExpression = 'a[name() = "b"]';
 
-        $xpathLen = strlen($xpath);
+        $xpathLen = \strlen($xpath);
         $openedBrackets = 0;
         $startPosition = strspn($xpath, " \t\n\r\0\x0B");
 
@@ -1060,7 +1060,7 @@ public function getNode($position)
      */
     public function count()
     {
-        return count($this->nodes);
+        return \count($this->nodes);
     }
 
     /**
diff --git a/src/Symfony/Component/DomCrawler/Field/ChoiceFormField.php b/src/Symfony/Component/DomCrawler/Field/ChoiceFormField.php
index b24bbd879b5a..c5c5f05e4a37 100644
--- a/src/Symfony/Component/DomCrawler/Field/ChoiceFormField.php
+++ b/src/Symfony/Component/DomCrawler/Field/ChoiceFormField.php
@@ -45,7 +45,7 @@ class ChoiceFormField extends FormField
     public function hasValue()
     {
         // don't send a value for unchecked checkboxes
-        if (in_array($this->type, array('checkbox', 'radio')) && null === $this->value) {
+        if (\in_array($this->type, array('checkbox', 'radio')) && null === $this->value) {
             return false;
         }
 
@@ -126,7 +126,7 @@ public function setValue($value)
             // check
             $this->value = $this->options[0]['value'];
         } else {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 if (!$this->multiple) {
                     throw new \InvalidArgumentException(sprintf('The value for "%s" cannot be an array.', $this->name));
                 }
@@ -144,7 +144,7 @@ public function setValue($value)
                 $value = (array) $value;
             }
 
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $this->value = $value;
             } else {
                 parent::setValue($value);
diff --git a/src/Symfony/Component/DomCrawler/Field/FileFormField.php b/src/Symfony/Component/DomCrawler/Field/FileFormField.php
index fc21239f0105..3288fc135a77 100644
--- a/src/Symfony/Component/DomCrawler/Field/FileFormField.php
+++ b/src/Symfony/Component/DomCrawler/Field/FileFormField.php
@@ -28,7 +28,7 @@ class FileFormField extends FormField
     public function setErrorCode($error)
     {
         $codes = array(UPLOAD_ERR_INI_SIZE, UPLOAD_ERR_FORM_SIZE, UPLOAD_ERR_PARTIAL, UPLOAD_ERR_NO_FILE, UPLOAD_ERR_NO_TMP_DIR, UPLOAD_ERR_CANT_WRITE, UPLOAD_ERR_EXTENSION);
-        if (!in_array($error, $codes)) {
+        if (!\in_array($error, $codes)) {
             throw new \InvalidArgumentException(sprintf('The error code %s is not valid.', $error));
         }
 
diff --git a/src/Symfony/Component/DomCrawler/Form.php b/src/Symfony/Component/DomCrawler/Form.php
index 6988d5096745..08d2295c8f13 100644
--- a/src/Symfony/Component/DomCrawler/Form.php
+++ b/src/Symfony/Component/DomCrawler/Form.php
@@ -108,7 +108,7 @@ public function getValues()
      */
     public function getFiles()
     {
-        if (!in_array($this->getMethod(), array('POST', 'PUT', 'DELETE', 'PATCH'))) {
+        if (!\in_array($this->getMethod(), array('POST', 'PUT', 'DELETE', 'PATCH'))) {
             return array();
         }
 
@@ -142,7 +142,7 @@ public function getPhpValues()
             $qs = http_build_query(array($name => $value), '', '&');
             if (!empty($qs)) {
                 parse_str($qs, $expandedValue);
-                $varName = substr($name, 0, strlen(key($expandedValue)));
+                $varName = substr($name, 0, \strlen(key($expandedValue)));
                 $values = array_replace_recursive($values, array($varName => current($expandedValue)));
             }
         }
@@ -169,7 +169,7 @@ public function getPhpFiles()
             $qs = http_build_query(array($name => $value), '', '&');
             if (!empty($qs)) {
                 parse_str($qs, $expandedValue);
-                $varName = substr($name, 0, strlen(key($expandedValue)));
+                $varName = substr($name, 0, \strlen(key($expandedValue)));
 
                 array_walk_recursive(
                     $expandedValue,
@@ -202,7 +202,7 @@ public function getUri()
     {
         $uri = parent::getUri();
 
-        if (!in_array($this->getMethod(), array('POST', 'PUT', 'DELETE', 'PATCH'))) {
+        if (!\in_array($this->getMethod(), array('POST', 'PUT', 'DELETE', 'PATCH'))) {
             $query = parse_url($uri, PHP_URL_QUERY);
             $currentParameters = array();
             if ($query) {
@@ -379,7 +379,7 @@ public function disableValidation()
     protected function setNode(\DOMElement $node)
     {
         $this->button = $node;
-        if ('button' === $node->nodeName || ('input' === $node->nodeName && in_array(strtolower($node->getAttribute('type')), array('submit', 'button', 'image')))) {
+        if ('button' === $node->nodeName || ('input' === $node->nodeName && \in_array(strtolower($node->getAttribute('type')), array('submit', 'button', 'image')))) {
             if ($node->hasAttribute('form')) {
                 // if the node has the HTML5-compliant 'form' attribute, use it
                 $formId = $node->getAttribute('form');
@@ -480,7 +480,7 @@ private function addField(\DOMElement $node)
             }
         } elseif ('input' == $nodeName && 'file' == strtolower($node->getAttribute('type'))) {
             $this->set(new Field\FileFormField($node));
-        } elseif ('input' == $nodeName && !in_array(strtolower($node->getAttribute('type')), array('submit', 'button', 'image'))) {
+        } elseif ('input' == $nodeName && !\in_array(strtolower($node->getAttribute('type')), array('submit', 'button', 'image'))) {
             $this->set(new Field\InputFormField($node));
         } elseif ('textarea' == $nodeName) {
             $this->set(new Field\TextareaFormField($node));
diff --git a/src/Symfony/Component/DomCrawler/FormFieldRegistry.php b/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
index 6ad6d933e406..d2acb15adac0 100644
--- a/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
+++ b/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
@@ -33,7 +33,7 @@ public function add(FormField $field)
 
         $target = &$this->fields;
         while ($segments) {
-            if (!is_array($target)) {
+            if (!\is_array($target)) {
                 $target = array();
             }
             $path = array_shift($segments);
@@ -55,7 +55,7 @@ public function remove($name)
     {
         $segments = $this->getSegments($name);
         $target = &$this->fields;
-        while (count($segments) > 1) {
+        while (\count($segments) > 1) {
             $path = array_shift($segments);
             if (!array_key_exists($path, $target)) {
                 return;
@@ -118,9 +118,9 @@ public function has($name)
     public function set($name, $value)
     {
         $target = &$this->get($name);
-        if ((!is_array($value) && $target instanceof Field\FormField) || $target instanceof Field\ChoiceFormField) {
+        if ((!\is_array($value) && $target instanceof Field\FormField) || $target instanceof Field\ChoiceFormField) {
             $target->setValue($value);
-        } elseif (is_array($value)) {
+        } elseif (\is_array($value)) {
             $fields = self::create($name, $value);
             foreach ($fields->all() as $k => $v) {
                 $this->set($k, $v);
@@ -173,7 +173,7 @@ private function walk(array $array, $base = '', array &$output = array())
     {
         foreach ($array as $k => $v) {
             $path = empty($base) ? $k : sprintf('%s[%s]', $base, $k);
-            if (is_array($v)) {
+            if (\is_array($v)) {
                 $this->walk($v, $path, $output);
             } else {
                 $output[$path] = $v;
diff --git a/src/Symfony/Component/DomCrawler/Tests/CrawlerTest.php b/src/Symfony/Component/DomCrawler/Tests/CrawlerTest.php
index a8dc525e55d2..9b2d1241949d 100644
--- a/src/Symfony/Component/DomCrawler/Tests/CrawlerTest.php
+++ b/src/Symfony/Component/DomCrawler/Tests/CrawlerTest.php
@@ -1027,7 +1027,7 @@ public function testParents()
     /**
      * @dataProvider getBaseTagData
      */
-    public function testBaseTag($baseValue, $linkValue, $expectedUri, $currentUri = null, $description = null)
+    public function testBaseTag($baseValue, $linkValue, $expectedUri, $currentUri = null, $description = '')
     {
         $crawler = new Crawler('<html><base href="'.$baseValue.'"><a href="'.$linkValue.'"></a></html>', $currentUri);
         $this->assertEquals($expectedUri, $crawler->filterXPath('//a')->link()->getUri(), $description);
diff --git a/src/Symfony/Component/DomCrawler/Tests/FormTest.php b/src/Symfony/Component/DomCrawler/Tests/FormTest.php
index 90e87d4c00a2..2f653d6c5815 100644
--- a/src/Symfony/Component/DomCrawler/Tests/FormTest.php
+++ b/src/Symfony/Component/DomCrawler/Tests/FormTest.php
@@ -191,7 +191,7 @@ public function testConstructor($message, $form, $values)
             $values,
             array_map(
                 function ($field) {
-                    $class = get_class($field);
+                    $class = \get_class($field);
 
                     return array(substr($class, strrpos($class, '\\') + 1), $field->getValue());
                 },
diff --git a/src/Symfony/Component/Dotenv/Dotenv.php b/src/Symfony/Component/Dotenv/Dotenv.php
index 29e3daab04a8..a10e7f7d2da5 100644
--- a/src/Symfony/Component/Dotenv/Dotenv.php
+++ b/src/Symfony/Component/Dotenv/Dotenv.php
@@ -110,7 +110,7 @@ public function parse(string $data, string $path = '.env'): array
         $this->data = str_replace(array("\r\n", "\r"), "\n", $data);
         $this->lineno = 1;
         $this->cursor = 0;
-        $this->end = strlen($this->data);
+        $this->end = \strlen($this->data);
         $this->state = self::STATE_VARNAME;
         $this->values = array();
         $name = '';
@@ -232,7 +232,7 @@ private function lexValue()
             } else {
                 $value = '';
                 $prevChr = $this->data[$this->cursor - 1];
-                while ($this->cursor < $this->end && !in_array($this->data[$this->cursor], array("\n", '"', "'"), true) && !((' ' === $prevChr || "\t" === $prevChr) && '#' === $this->data[$this->cursor])) {
+                while ($this->cursor < $this->end && !\in_array($this->data[$this->cursor], array("\n", '"', "'"), true) && !((' ' === $prevChr || "\t" === $prevChr) && '#' === $this->data[$this->cursor])) {
                     if ('\\' === $this->data[$this->cursor] && isset($this->data[$this->cursor + 1]) && ('"' === $this->data[$this->cursor + 1] || "'" === $this->data[$this->cursor + 1])) {
                         ++$this->cursor;
                     }
@@ -322,7 +322,7 @@ private function resolveCommands($value)
                 return substr($matches[0], 1);
             }
 
-            if ('\\' === DIRECTORY_SEPARATOR) {
+            if ('\\' === \DIRECTORY_SEPARATOR) {
                 throw new \LogicException('Resolving commands is not supported on Windows.');
             }
 
@@ -391,7 +391,7 @@ private function resolveVariables($value)
 
     private function moveCursor($text)
     {
-        $this->cursor += strlen($text);
+        $this->cursor += \strlen($text);
         $this->lineno += substr_count($text, "\n");
     }
 
diff --git a/src/Symfony/Component/Dotenv/Exception/FormatExceptionContext.php b/src/Symfony/Component/Dotenv/Exception/FormatExceptionContext.php
index 995477cf898b..c1d32d4a7e09 100644
--- a/src/Symfony/Component/Dotenv/Exception/FormatExceptionContext.php
+++ b/src/Symfony/Component/Dotenv/Exception/FormatExceptionContext.php
@@ -44,6 +44,6 @@ public function getDetails()
         $before = str_replace("\n", '\n', substr($this->data, max(0, $this->cursor - 20), min(20, $this->cursor)));
         $after = str_replace("\n", '\n', substr($this->data, $this->cursor, 20));
 
-        return '...'.$before.$after."...\n".str_repeat(' ', strlen($before) + 2).'^ line '.$this->lineno.' offset '.$this->cursor;
+        return '...'.$before.$after."...\n".str_repeat(' ', \strlen($before) + 2).'^ line '.$this->lineno.' offset '.$this->cursor;
     }
 }
diff --git a/src/Symfony/Component/Dotenv/Tests/DotenvTest.php b/src/Symfony/Component/Dotenv/Tests/DotenvTest.php
index ce7d3a93396b..b4b89280d5b1 100644
--- a/src/Symfony/Component/Dotenv/Tests/DotenvTest.php
+++ b/src/Symfony/Component/Dotenv/Tests/DotenvTest.php
@@ -44,7 +44,7 @@ public function getEnvDataWithFormatErrors()
             array('FOO=${FOO', "Unclosed braces on variable expansion in \".env\" at line 1.\n...FOO=\${FOO...\n           ^ line 1 offset 9"),
         );
 
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $tests[] = array('FOO=$((1dd2))', "Issue expanding a command (%s\n) in \".env\" at line 1.\n...FOO=$((1dd2))...\n               ^ line 1 offset 13");
         }
 
@@ -139,7 +139,7 @@ public function getEnvData()
             array('FOO=$NOTDEFINED', array('FOO' => '')),
         );
 
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $tests = array_merge($tests, array(
                 // command expansion
                 array('FOO=$(echo foo)', array('FOO' => 'foo')),
diff --git a/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php b/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
index 9b5c689ad713..e5d59402cf3a 100644
--- a/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\EventDispatcher\Debug;
 
+use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\Stopwatch\Stopwatch;
-use Psr\Log\LoggerInterface;
 
 /**
  * Collects some data about event listeners.
@@ -222,7 +222,7 @@ public function reset()
      */
     public function __call($method, $arguments)
     {
-        return call_user_func_array(array($this->dispatcher, $method), $arguments);
+        return \call_user_func_array(array($this->dispatcher, $method), $arguments);
     }
 
     /**
@@ -301,11 +301,11 @@ private function postProcess($eventName)
 
     private function sortListenersByPriority($a, $b)
     {
-        if (is_int($a['priority']) && !is_int($b['priority'])) {
+        if (\is_int($a['priority']) && !\is_int($b['priority'])) {
             return 1;
         }
 
-        if (!is_int($a['priority']) && is_int($b['priority'])) {
+        if (!\is_int($a['priority']) && \is_int($b['priority'])) {
             return -1;
         }
 
diff --git a/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php b/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
index f7b0273e15aa..2d8126a65d6b 100644
--- a/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
+++ b/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\EventDispatcher\Debug;
 
-use Symfony\Component\Stopwatch\Stopwatch;
 use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Stopwatch\Stopwatch;
 use Symfony\Component\VarDumper\Caster\ClassStub;
 
 /**
@@ -40,15 +40,15 @@ public function __construct($listener, $name, Stopwatch $stopwatch, EventDispatc
         $this->called = false;
         $this->stoppedPropagation = false;
 
-        if (is_array($listener)) {
-            $this->name = is_object($listener[0]) ? get_class($listener[0]) : $listener[0];
+        if (\is_array($listener)) {
+            $this->name = \is_object($listener[0]) ? \get_class($listener[0]) : $listener[0];
             $this->pretty = $this->name.'::'.$listener[1];
         } elseif ($listener instanceof \Closure) {
             $this->pretty = $this->name = 'closure';
-        } elseif (is_string($listener)) {
+        } elseif (\is_string($listener)) {
             $this->pretty = $this->name = $listener;
         } else {
-            $this->name = get_class($listener);
+            $this->name = \get_class($listener);
             $this->pretty = $this->name.'::__invoke';
         }
 
@@ -101,7 +101,7 @@ public function __invoke(Event $event, $eventName, EventDispatcherInterface $dis
 
         $e = $this->stopwatch->start($this->name, 'event_listener');
 
-        call_user_func($this->listener, $event, $eventName, $this->dispatcher ?: $dispatcher);
+        \call_user_func($this->listener, $event, $eventName, $this->dispatcher ?: $dispatcher);
 
         if ($e->isStarted()) {
             $e->stop();
diff --git a/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php b/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
index a546516a8cfc..570221f048d3 100644
--- a/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
+++ b/src/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\EventDispatcher\DependencyInjection;
 
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\EventDispatcher\EventDispatcher;
diff --git a/src/Symfony/Component/EventDispatcher/EventDispatcher.php b/src/Symfony/Component/EventDispatcher/EventDispatcher.php
index bc79a958da12..4e75c63e4faf 100644
--- a/src/Symfony/Component/EventDispatcher/EventDispatcher.php
+++ b/src/Symfony/Component/EventDispatcher/EventDispatcher.php
@@ -82,13 +82,13 @@ public function getListenerPriority($eventName, $listener)
             return;
         }
 
-        if (is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
+        if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
             $listener[0] = $listener[0]();
         }
 
         foreach ($this->listeners[$eventName] as $priority => $listeners) {
             foreach ($listeners as $k => $v) {
-                if ($v !== $listener && is_array($v) && isset($v[0]) && $v[0] instanceof \Closure) {
+                if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure) {
                     $v[0] = $v[0]();
                     $this->listeners[$eventName][$priority][$k] = $v;
                 }
@@ -135,13 +135,13 @@ public function removeListener($eventName, $listener)
             return;
         }
 
-        if (is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
+        if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
             $listener[0] = $listener[0]();
         }
 
         foreach ($this->listeners[$eventName] as $priority => $listeners) {
             foreach ($listeners as $k => $v) {
-                if ($v !== $listener && is_array($v) && isset($v[0]) && $v[0] instanceof \Closure) {
+                if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure) {
                     $v[0] = $v[0]();
                 }
                 if ($v === $listener) {
@@ -165,9 +165,9 @@ public function removeListener($eventName, $listener)
     public function addSubscriber(EventSubscriberInterface $subscriber)
     {
         foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
-            if (is_string($params)) {
+            if (\is_string($params)) {
                 $this->addListener($eventName, array($subscriber, $params));
-            } elseif (is_string($params[0])) {
+            } elseif (\is_string($params[0])) {
                 $this->addListener($eventName, array($subscriber, $params[0]), isset($params[1]) ? $params[1] : 0);
             } else {
                 foreach ($params as $listener) {
@@ -183,12 +183,12 @@ public function addSubscriber(EventSubscriberInterface $subscriber)
     public function removeSubscriber(EventSubscriberInterface $subscriber)
     {
         foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
-            if (is_array($params) && is_array($params[0])) {
+            if (\is_array($params) && \is_array($params[0])) {
                 foreach ($params as $listener) {
                     $this->removeListener($eventName, array($subscriber, $listener[0]));
                 }
             } else {
-                $this->removeListener($eventName, array($subscriber, is_string($params) ? $params : $params[0]));
+                $this->removeListener($eventName, array($subscriber, \is_string($params) ? $params : $params[0]));
             }
         }
     }
diff --git a/src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php b/src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php
index 53a3421afaf6..d7c5ce18ccca 100644
--- a/src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php
+++ b/src/Symfony/Component/EventDispatcher/Tests/Debug/TraceableEventDispatcherTest.php
@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher;
+use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\EventDispatcher\EventDispatcher;
-use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\Stopwatch\Stopwatch;
 
 class TraceableEventDispatcherTest extends TestCase
diff --git a/src/Symfony/Component/ExpressionLanguage/Compiler.php b/src/Symfony/Component/ExpressionLanguage/Compiler.php
index 66d106041fde..acfb6184a499 100644
--- a/src/Symfony/Component/ExpressionLanguage/Compiler.php
+++ b/src/Symfony/Component/ExpressionLanguage/Compiler.php
@@ -110,7 +110,7 @@ public function string($value)
      */
     public function repr($value)
     {
-        if (is_int($value) || is_float($value)) {
+        if (\is_int($value) || \is_float($value)) {
             if (false !== $locale = setlocale(LC_NUMERIC, 0)) {
                 setlocale(LC_NUMERIC, 'C');
             }
@@ -122,9 +122,9 @@ public function repr($value)
             }
         } elseif (null === $value) {
             $this->raw('null');
-        } elseif (is_bool($value)) {
+        } elseif (\is_bool($value)) {
             $this->raw($value ? 'true' : 'false');
-        } elseif (is_array($value)) {
+        } elseif (\is_array($value)) {
             $this->raw('array(');
             $first = true;
             foreach ($value as $key => $value) {
diff --git a/src/Symfony/Component/ExpressionLanguage/ExpressionFunction.php b/src/Symfony/Component/ExpressionLanguage/ExpressionFunction.php
index 448cd466f095..968d80fa9cf5 100644
--- a/src/Symfony/Component/ExpressionLanguage/ExpressionFunction.php
+++ b/src/Symfony/Component/ExpressionLanguage/ExpressionFunction.php
@@ -76,23 +76,23 @@ public function getEvaluator()
     public static function fromPhp($phpFunctionName, $expressionFunctionName = null)
     {
         $phpFunctionName = ltrim($phpFunctionName, '\\');
-        if (!function_exists($phpFunctionName)) {
+        if (!\function_exists($phpFunctionName)) {
             throw new \InvalidArgumentException(sprintf('PHP function "%s" does not exist.', $phpFunctionName));
         }
 
         $parts = explode('\\', $phpFunctionName);
-        if (!$expressionFunctionName && count($parts) > 1) {
+        if (!$expressionFunctionName && \count($parts) > 1) {
             throw new \InvalidArgumentException(sprintf('An expression function name must be defined when PHP function "%s" is namespaced.', $phpFunctionName));
         }
 
         $compiler = function () use ($phpFunctionName) {
-            return sprintf('\%s(%s)', $phpFunctionName, implode(', ', func_get_args()));
+            return sprintf('\%s(%s)', $phpFunctionName, implode(', ', \func_get_args()));
         };
 
         $evaluator = function () use ($phpFunctionName) {
-            $args = func_get_args();
+            $args = \func_get_args();
 
-            return call_user_func_array($phpFunctionName, array_splice($args, 1));
+            return \call_user_func_array($phpFunctionName, array_splice($args, 1));
         };
 
         return new self($expressionFunctionName ?: end($parts), $compiler, $evaluator);
diff --git a/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php b/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php
index 342600c20f31..851fe0015768 100644
--- a/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php
+++ b/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php
@@ -85,7 +85,7 @@ public function parse($expression, $names)
         $cacheKeyItems = array();
 
         foreach ($names as $nameKey => $name) {
-            $cacheKeyItems[] = is_int($nameKey) ? $name : $nameKey.':'.$name;
+            $cacheKeyItems[] = \is_int($nameKey) ? $name : $nameKey.':'.$name;
         }
 
         $cacheItem = $this->cache->getItem(rawurlencode($expression.'//'.implode('|', $cacheKeyItems)));
diff --git a/src/Symfony/Component/ExpressionLanguage/Lexer.php b/src/Symfony/Component/ExpressionLanguage/Lexer.php
index aeeda8a856c9..bd54e8913a7f 100644
--- a/src/Symfony/Component/ExpressionLanguage/Lexer.php
+++ b/src/Symfony/Component/ExpressionLanguage/Lexer.php
@@ -33,7 +33,7 @@ public function tokenize($expression)
         $cursor = 0;
         $tokens = array();
         $brackets = array();
-        $end = strlen($expression);
+        $end = \strlen($expression);
 
         while ($cursor < $end) {
             if (' ' == $expression[$cursor]) {
@@ -49,7 +49,7 @@ public function tokenize($expression)
                     $number = (int) $match[0]; // integers lower than the maximum
                 }
                 $tokens[] = new Token(Token::NUMBER_TYPE, $number, $cursor + 1);
-                $cursor += strlen($match[0]);
+                $cursor += \strlen($match[0]);
             } elseif (false !== strpos('([{', $expression[$cursor])) {
                 // opening bracket
                 $brackets[] = array($expression[$cursor], $cursor);
@@ -72,11 +72,11 @@ public function tokenize($expression)
             } elseif (preg_match('/"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As', $expression, $match, 0, $cursor)) {
                 // strings
                 $tokens[] = new Token(Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1)), $cursor + 1);
-                $cursor += strlen($match[0]);
+                $cursor += \strlen($match[0]);
             } elseif (preg_match('/not in(?=[\s(])|\!\=\=|not(?=[\s(])|and(?=[\s(])|\=\=\=|\>\=|or(?=[\s(])|\<\=|\*\*|\.\.|in(?=[\s(])|&&|\|\||matches|\=\=|\!\=|\*|~|%|\/|\>|\||\!|\^|&|\+|\<|\-/A', $expression, $match, 0, $cursor)) {
                 // operators
                 $tokens[] = new Token(Token::OPERATOR_TYPE, $match[0], $cursor + 1);
-                $cursor += strlen($match[0]);
+                $cursor += \strlen($match[0]);
             } elseif (false !== strpos('.,?:', $expression[$cursor])) {
                 // punctuation
                 $tokens[] = new Token(Token::PUNCTUATION_TYPE, $expression[$cursor], $cursor + 1);
@@ -84,7 +84,7 @@ public function tokenize($expression)
             } elseif (preg_match('/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A', $expression, $match, 0, $cursor)) {
                 // names
                 $tokens[] = new Token(Token::NAME_TYPE, $match[0], $cursor + 1);
-                $cursor += strlen($match[0]);
+                $cursor += \strlen($match[0]);
             } else {
                 // unlexable
                 throw new SyntaxError(sprintf('Unexpected character "%s"', $expression[$cursor]), $cursor, $expression);
diff --git a/src/Symfony/Component/ExpressionLanguage/Node/BinaryNode.php b/src/Symfony/Component/ExpressionLanguage/Node/BinaryNode.php
index 26b456145c1c..48c6548fa8c6 100644
--- a/src/Symfony/Component/ExpressionLanguage/Node/BinaryNode.php
+++ b/src/Symfony/Component/ExpressionLanguage/Node/BinaryNode.php
@@ -93,7 +93,7 @@ public function evaluate($functions, $values)
             $right = $this->nodes['right']->evaluate($functions, $values);
 
             if ('not in' === $operator) {
-                return !in_array($left, $right);
+                return !\in_array($left, $right);
             }
             $f = self::$functions[$operator];
 
@@ -135,9 +135,9 @@ public function evaluate($functions, $values)
             case '<=':
                 return $left <= $right;
             case 'not in':
-                return !in_array($left, $right);
+                return !\in_array($left, $right);
             case 'in':
-                return in_array($left, $right);
+                return \in_array($left, $right);
             case '+':
                 return $left + $right;
             case '-':
diff --git a/src/Symfony/Component/ExpressionLanguage/Node/ConstantNode.php b/src/Symfony/Component/ExpressionLanguage/Node/ConstantNode.php
index d1bd7c69e8d4..de2c48f10da9 100644
--- a/src/Symfony/Component/ExpressionLanguage/Node/ConstantNode.php
+++ b/src/Symfony/Component/ExpressionLanguage/Node/ConstantNode.php
@@ -56,7 +56,7 @@ public function toArray()
             $array[] = 'null';
         } elseif (is_numeric($value)) {
             $array[] = $value;
-        } elseif (!is_array($value)) {
+        } elseif (!\is_array($value)) {
             $array[] = $this->dumpString($value);
         } elseif ($this->isHash($value)) {
             foreach ($value as $k => $v) {
diff --git a/src/Symfony/Component/ExpressionLanguage/Node/FunctionNode.php b/src/Symfony/Component/ExpressionLanguage/Node/FunctionNode.php
index e3424b50d4ba..1a1ad4336b06 100644
--- a/src/Symfony/Component/ExpressionLanguage/Node/FunctionNode.php
+++ b/src/Symfony/Component/ExpressionLanguage/Node/FunctionNode.php
@@ -37,7 +37,7 @@ public function compile(Compiler $compiler)
 
         $function = $compiler->getFunction($this->attributes['name']);
 
-        $compiler->raw(call_user_func_array($function['compiler'], $arguments));
+        $compiler->raw(\call_user_func_array($function['compiler'], $arguments));
     }
 
     public function evaluate($functions, $values)
@@ -47,7 +47,7 @@ public function evaluate($functions, $values)
             $arguments[] = $node->evaluate($functions, $values);
         }
 
-        return call_user_func_array($functions[$this->attributes['name']]['evaluator'], $arguments);
+        return \call_user_func_array($functions[$this->attributes['name']]['evaluator'], $arguments);
     }
 
     public function toArray()
diff --git a/src/Symfony/Component/ExpressionLanguage/Node/GetAttrNode.php b/src/Symfony/Component/ExpressionLanguage/Node/GetAttrNode.php
index bafd227b48ed..6a8b47ce1ab8 100644
--- a/src/Symfony/Component/ExpressionLanguage/Node/GetAttrNode.php
+++ b/src/Symfony/Component/ExpressionLanguage/Node/GetAttrNode.php
@@ -69,7 +69,7 @@ public function evaluate($functions, $values)
         switch ($this->attributes['type']) {
             case self::PROPERTY_CALL:
                 $obj = $this->nodes['node']->evaluate($functions, $values);
-                if (!is_object($obj)) {
+                if (!\is_object($obj)) {
                     throw new \RuntimeException('Unable to get a property on a non-object.');
                 }
 
@@ -79,18 +79,18 @@ public function evaluate($functions, $values)
 
             case self::METHOD_CALL:
                 $obj = $this->nodes['node']->evaluate($functions, $values);
-                if (!is_object($obj)) {
+                if (!\is_object($obj)) {
                     throw new \RuntimeException('Unable to get a property on a non-object.');
                 }
-                if (!is_callable($toCall = array($obj, $this->nodes['attribute']->attributes['value']))) {
-                    throw new \RuntimeException(sprintf('Unable to call method "%s" of object "%s".', $this->nodes['attribute']->attributes['value'], get_class($obj)));
+                if (!\is_callable($toCall = array($obj, $this->nodes['attribute']->attributes['value']))) {
+                    throw new \RuntimeException(sprintf('Unable to call method "%s" of object "%s".', $this->nodes['attribute']->attributes['value'], \get_class($obj)));
                 }
 
-                return call_user_func_array($toCall, $this->nodes['arguments']->evaluate($functions, $values));
+                return \call_user_func_array($toCall, $this->nodes['arguments']->evaluate($functions, $values));
 
             case self::ARRAY_CALL:
                 $array = $this->nodes['node']->evaluate($functions, $values);
-                if (!is_array($array) && !$array instanceof \ArrayAccess) {
+                if (!\is_array($array) && !$array instanceof \ArrayAccess) {
                     throw new \RuntimeException('Unable to get an item on a non-array.');
                 }
 
diff --git a/src/Symfony/Component/ExpressionLanguage/Node/Node.php b/src/Symfony/Component/ExpressionLanguage/Node/Node.php
index 1db4e852803b..c6eb9f035177 100644
--- a/src/Symfony/Component/ExpressionLanguage/Node/Node.php
+++ b/src/Symfony/Component/ExpressionLanguage/Node/Node.php
@@ -40,9 +40,9 @@ public function __toString()
             $attributes[] = sprintf('%s: %s', $name, str_replace("\n", '', var_export($value, true)));
         }
 
-        $repr = array(str_replace('Symfony\Component\ExpressionLanguage\Node\\', '', get_class($this)).'('.implode(', ', $attributes));
+        $repr = array(str_replace('Symfony\Component\ExpressionLanguage\Node\\', '', \get_class($this)).'('.implode(', ', $attributes));
 
-        if (count($this->nodes)) {
+        if (\count($this->nodes)) {
             foreach ($this->nodes as $node) {
                 foreach (explode("\n", (string) $node) as $line) {
                     $repr[] = '    '.$line;
@@ -76,7 +76,7 @@ public function evaluate($functions, $values)
 
     public function toArray()
     {
-        throw new \BadMethodCallException(sprintf('Dumping a "%s" instance is not supported yet.', get_class($this)));
+        throw new \BadMethodCallException(sprintf('Dumping a "%s" instance is not supported yet.', \get_class($this)));
     }
 
     public function dump()
diff --git a/src/Symfony/Component/ExpressionLanguage/Parser.php b/src/Symfony/Component/ExpressionLanguage/Parser.php
index 4b1ce8e3a165..a3b31ce9769c 100644
--- a/src/Symfony/Component/ExpressionLanguage/Parser.php
+++ b/src/Symfony/Component/ExpressionLanguage/Parser.php
@@ -200,13 +200,13 @@ public function parsePrimaryExpression()
 
                             $node = new Node\FunctionNode($token->value, $this->parseArguments());
                         } else {
-                            if (!in_array($token->value, $this->names, true)) {
+                            if (!\in_array($token->value, $this->names, true)) {
                                 throw new SyntaxError(sprintf('Variable "%s" is not valid', $token->value), $token->cursor, $this->stream->getExpression(), $token->value, $this->names);
                             }
 
                             // is the name used in the compiled code different
                             // from the name used in the expression?
-                            if (is_int($name = array_search($token->value, $this->names))) {
+                            if (\is_int($name = array_search($token->value, $this->names))) {
                                 $name = $token->value;
                             }
 
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php
index c5aed437209d..15a26d5f3fcb 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\ExpressionLanguage\Tests;
 
-use Symfony\Component\ExpressionLanguage\ExpressionFunction;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
 use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
 use Symfony\Component\ExpressionLanguage\ParsedExpression;
 use Symfony\Component\ExpressionLanguage\Tests\Fixtures\TestProvider;
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/LexerTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/LexerTest.php
index 87c16f707b92..16bf4508628b 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/LexerTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/LexerTest.php
@@ -33,7 +33,7 @@ protected function setUp()
      */
     public function testTokenize($tokens, $expression)
     {
-        $tokens[] = new Token('end of expression', null, strlen($expression) + 1);
+        $tokens[] = new Token('end of expression', null, \strlen($expression) + 1);
         $this->assertEquals(new TokenStream($tokens, $expression), $this->lexer->tokenize($expression));
     }
 
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/Node/BinaryNodeTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/Node/BinaryNodeTest.php
index 258d276b53c3..f8456f8dbb74 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/Node/BinaryNodeTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/Node/BinaryNodeTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\ExpressionLanguage\Tests\Node;
 
-use Symfony\Component\ExpressionLanguage\Node\BinaryNode;
 use Symfony\Component\ExpressionLanguage\Node\ArrayNode;
+use Symfony\Component\ExpressionLanguage\Node\BinaryNode;
 use Symfony\Component\ExpressionLanguage\Node\ConstantNode;
 
 class BinaryNodeTest extends AbstractNodeTest
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/Node/FunctionNodeTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/Node/FunctionNodeTest.php
index 8d6f92a9c752..3bddc5e5647e 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/Node/FunctionNodeTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/Node/FunctionNodeTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\ExpressionLanguage\Tests\Node;
 
-use Symfony\Component\ExpressionLanguage\Node\FunctionNode;
 use Symfony\Component\ExpressionLanguage\Node\ConstantNode;
+use Symfony\Component\ExpressionLanguage\Node\FunctionNode;
 use Symfony\Component\ExpressionLanguage\Node\Node;
 
 class FunctionNodeTest extends AbstractNodeTest
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/Node/GetAttrNodeTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/Node/GetAttrNodeTest.php
index cf7cd7a03be5..750acaf93ee9 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/Node/GetAttrNodeTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/Node/GetAttrNodeTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\ExpressionLanguage\Tests\Node;
 
 use Symfony\Component\ExpressionLanguage\Node\ArrayNode;
-use Symfony\Component\ExpressionLanguage\Node\NameNode;
-use Symfony\Component\ExpressionLanguage\Node\GetAttrNode;
 use Symfony\Component\ExpressionLanguage\Node\ConstantNode;
+use Symfony\Component\ExpressionLanguage\Node\GetAttrNode;
+use Symfony\Component\ExpressionLanguage\Node\NameNode;
 
 class GetAttrNodeTest extends AbstractNodeTest
 {
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/Node/NodeTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/Node/NodeTest.php
index 0f35b5febe8e..140f1521340d 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/Node/NodeTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/Node/NodeTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\ExpressionLanguage\Tests\Node;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\ExpressionLanguage\Node\Node;
 use Symfony\Component\ExpressionLanguage\Node\ConstantNode;
+use Symfony\Component\ExpressionLanguage\Node\Node;
 
 class NodeTest extends TestCase
 {
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/Node/UnaryNodeTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/Node/UnaryNodeTest.php
index ae2e3eee768b..ef072cb6ec5b 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/Node/UnaryNodeTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/Node/UnaryNodeTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\ExpressionLanguage\Tests\Node;
 
-use Symfony\Component\ExpressionLanguage\Node\UnaryNode;
 use Symfony\Component\ExpressionLanguage\Node\ConstantNode;
+use Symfony\Component\ExpressionLanguage\Node\UnaryNode;
 
 class UnaryNodeTest extends AbstractNodeTest
 {
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/ParserTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/ParserTest.php
index 11464abd23e1..1e9ffba21e53 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/ParserTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/ParserTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\ExpressionLanguage\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\ExpressionLanguage\Parser;
 use Symfony\Component\ExpressionLanguage\Lexer;
 use Symfony\Component\ExpressionLanguage\Node;
+use Symfony\Component\ExpressionLanguage\Parser;
 
 class ParserTest extends TestCase
 {
diff --git a/src/Symfony/Component/Filesystem/Filesystem.php b/src/Symfony/Component/Filesystem/Filesystem.php
index 046dbb940e39..9e44f2f3d92c 100644
--- a/src/Symfony/Component/Filesystem/Filesystem.php
+++ b/src/Symfony/Component/Filesystem/Filesystem.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Filesystem;
 
+use Symfony\Component\Filesystem\Exception\FileNotFoundException;
 use Symfony\Component\Filesystem\Exception\InvalidArgumentException;
 use Symfony\Component\Filesystem\Exception\IOException;
-use Symfony\Component\Filesystem\Exception\FileNotFoundException;
 
 /**
  * Provides basic utility to manipulate the file system.
@@ -45,7 +45,7 @@ public function copy($originFile, $targetFile, $overwriteNewerFiles = false)
             throw new FileNotFoundException(sprintf('Failed to copy "%s" because file does not exist.', $originFile), 0, null, $originFile);
         }
 
-        $this->mkdir(dirname($targetFile));
+        $this->mkdir(\dirname($targetFile));
 
         $doCopy = true;
         if (!$overwriteNewerFiles && null === parse_url($originFile, PHP_URL_HOST) && is_file($targetFile)) {
@@ -122,7 +122,7 @@ public function exists($files)
         $maxPathLength = PHP_MAXPATHLEN - 2;
 
         foreach ($this->toIterable($files) as $file) {
-            if (strlen($file) > $maxPathLength) {
+            if (\strlen($file) > $maxPathLength) {
                 throw new IOException(sprintf('Could not check if file exist because path length exceeds %d characters.', $maxPathLength), 0, null, $file);
             }
 
@@ -164,14 +164,14 @@ public function remove($files)
     {
         if ($files instanceof \Traversable) {
             $files = iterator_to_array($files, false);
-        } elseif (!is_array($files)) {
+        } elseif (!\is_array($files)) {
             $files = array($files);
         }
         $files = array_reverse($files);
         foreach ($files as $file) {
             if (is_link($file)) {
                 // See https://bugs.php.net/52176
-                if (!(self::box('unlink', $file) || '\\' !== DIRECTORY_SEPARATOR || self::box('rmdir', $file)) && file_exists($file)) {
+                if (!(self::box('unlink', $file) || '\\' !== \DIRECTORY_SEPARATOR || self::box('rmdir', $file)) && file_exists($file)) {
                     throw new IOException(sprintf('Failed to remove symlink "%s": %s.', $file, self::$lastError));
                 }
             } elseif (is_dir($file)) {
@@ -223,7 +223,7 @@ public function chown($files, $user, $recursive = false)
             if ($recursive && is_dir($file) && !is_link($file)) {
                 $this->chown(new \FilesystemIterator($file), $user, true);
             }
-            if (is_link($file) && function_exists('lchown')) {
+            if (is_link($file) && \function_exists('lchown')) {
                 if (true !== @lchown($file, $user)) {
                     throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
                 }
@@ -250,7 +250,7 @@ public function chgrp($files, $group, $recursive = false)
             if ($recursive && is_dir($file) && !is_link($file)) {
                 $this->chgrp(new \FilesystemIterator($file), $group, true);
             }
-            if (is_link($file) && function_exists('lchgrp')) {
+            if (is_link($file) && \function_exists('lchgrp')) {
                 if (true !== @lchgrp($file, $group)) {
                     throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
                 }
@@ -304,7 +304,7 @@ private function isReadable($filename)
     {
         $maxPathLength = PHP_MAXPATHLEN - 2;
 
-        if (strlen($filename) > $maxPathLength) {
+        if (\strlen($filename) > $maxPathLength) {
             throw new IOException(sprintf('Could not check if file is readable because path length exceeds %d characters.', $maxPathLength), 0, null, $filename);
         }
 
@@ -322,7 +322,7 @@ private function isReadable($filename)
      */
     public function symlink($originDir, $targetDir, $copyOnWindows = false)
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $originDir = strtr($originDir, '/', '\\');
             $targetDir = strtr($targetDir, '/', '\\');
 
@@ -333,7 +333,7 @@ public function symlink($originDir, $targetDir, $copyOnWindows = false)
             }
         }
 
-        $this->mkdir(dirname($targetDir));
+        $this->mkdir(\dirname($targetDir));
 
         if (is_link($targetDir)) {
             if (readlink($targetDir) === $originDir) {
@@ -388,7 +388,7 @@ public function hardlink($originFile, $targetFiles)
     private function linkException($origin, $target, $linkType)
     {
         if (self::$lastError) {
-            if ('\\' === DIRECTORY_SEPARATOR && false !== strpos(self::$lastError, 'error code(1314)')) {
+            if ('\\' === \DIRECTORY_SEPARATOR && false !== strpos(self::$lastError, 'error code(1314)')) {
                 throw new IOException(sprintf('Unable to create %s link due to error code 1314: \'A required privilege is not held by the client\'. Do you have the required Administrator-rights?', $linkType), 0, null, $target);
             }
         }
@@ -422,14 +422,14 @@ public function readlink($path, $canonicalize = false)
                 return;
             }
 
-            if ('\\' === DIRECTORY_SEPARATOR) {
+            if ('\\' === \DIRECTORY_SEPARATOR) {
                 $path = readlink($path);
             }
 
             return realpath($path);
         }
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             return realpath($path);
         }
 
@@ -455,13 +455,13 @@ public function makePathRelative($endPath, $startPath)
         }
 
         // Normalize separators on Windows
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $endPath = str_replace('\\', '/', $endPath);
             $startPath = str_replace('\\', '/', $startPath);
         }
 
         $stripDriveLetter = function ($path) {
-            if (strlen($path) > 2 && ':' === $path[1] && '/' === $path[2] && ctype_alpha($path[0])) {
+            if (\strlen($path) > 2 && ':' === $path[1] && '/' === $path[2] && ctype_alpha($path[0])) {
                 return substr($path, 2);
             }
 
@@ -499,16 +499,16 @@ public function makePathRelative($endPath, $startPath)
         }
 
         // Determine how deep the start path is relative to the common path (ie, "web/bundles" = 2 levels)
-        if (1 === count($startPathArr) && '' === $startPathArr[0]) {
+        if (1 === \count($startPathArr) && '' === $startPathArr[0]) {
             $depth = 0;
         } else {
-            $depth = count($startPathArr) - $index;
+            $depth = \count($startPathArr) - $index;
         }
 
         // Repeated "../" for each level need to reach the common path
         $traverser = str_repeat('../', $depth);
 
-        $endPathRemainder = implode('/', array_slice($endPathArr, $index));
+        $endPathRemainder = implode('/', \array_slice($endPathArr, $index));
 
         // Construct $endPath from traversing to the common path, then to the remaining $endPath
         $relativePath = $traverser.('' !== $endPathRemainder ? $endPathRemainder.'/' : '');
@@ -539,7 +539,7 @@ public function mirror($originDir, $targetDir, \Traversable $iterator = null, $o
     {
         $targetDir = rtrim($targetDir, '/\\');
         $originDir = rtrim($originDir, '/\\');
-        $originDirLen = strlen($originDir);
+        $originDirLen = \strlen($originDir);
 
         // Iterate in destination folder to remove obsolete entries
         if ($this->exists($targetDir) && isset($options['delete']) && $options['delete']) {
@@ -548,7 +548,7 @@ public function mirror($originDir, $targetDir, \Traversable $iterator = null, $o
                 $flags = \FilesystemIterator::SKIP_DOTS;
                 $deleteIterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($targetDir, $flags), \RecursiveIteratorIterator::CHILD_FIRST);
             }
-            $targetDirLen = strlen($targetDir);
+            $targetDirLen = \strlen($targetDir);
             foreach ($deleteIterator as $file) {
                 $origin = $originDir.substr($file->getPathname(), $targetDirLen);
                 if (!$this->exists($origin)) {
@@ -606,7 +606,7 @@ public function mirror($originDir, $targetDir, \Traversable $iterator = null, $o
     public function isAbsolutePath($file)
     {
         return strspn($file, '/\\', 0, 1)
-            || (strlen($file) > 3 && ctype_alpha($file[0])
+            || (\strlen($file) > 3 && ctype_alpha($file[0])
                 && ':' === $file[1]
                 && strspn($file, '/\\', 2, 1)
             )
@@ -676,7 +676,7 @@ public function tempnam($dir, $prefix)
      */
     public function dumpFile($filename, $content)
     {
-        $dir = dirname($filename);
+        $dir = \dirname($filename);
 
         if (!is_dir($dir)) {
             $this->mkdir($dir);
@@ -709,7 +709,7 @@ public function dumpFile($filename, $content)
      */
     public function appendToFile($filename, $content)
     {
-        $dir = dirname($filename);
+        $dir = \dirname($filename);
 
         if (!is_dir($dir)) {
             $this->mkdir($dir);
@@ -726,7 +726,7 @@ public function appendToFile($filename, $content)
 
     private function toIterable($files): iterable
     {
-        return is_array($files) || $files instanceof \Traversable ? $files : array($files);
+        return \is_array($files) || $files instanceof \Traversable ? $files : array($files);
     }
 
     /**
@@ -736,7 +736,7 @@ private function getSchemeAndHierarchy(string $filename): array
     {
         $components = explode('://', $filename, 2);
 
-        return 2 === count($components) ? array($components[0], $components[1]) : array(null, $components[0]);
+        return 2 === \count($components) ? array($components[0], $components[1]) : array(null, $components[0]);
     }
 
     private static function box($func)
diff --git a/src/Symfony/Component/Filesystem/Tests/ExceptionTest.php b/src/Symfony/Component/Filesystem/Tests/ExceptionTest.php
index 5a04e0409048..300acf103423 100644
--- a/src/Symfony/Component/Filesystem/Tests/ExceptionTest.php
+++ b/src/Symfony/Component/Filesystem/Tests/ExceptionTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Filesystem\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Filesystem\Exception\IOException;
 use Symfony\Component\Filesystem\Exception\FileNotFoundException;
+use Symfony\Component\Filesystem\Exception\IOException;
 
 /**
  * Test class for Filesystem.
diff --git a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
index def1e5fc0995..0c069c351a7b 100644
--- a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
+++ b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
@@ -18,8 +18,8 @@ class FilesystemTest extends FilesystemTestCase
 {
     public function testCopyCreatesNewFile()
     {
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($sourceFilePath, 'SOURCE FILE');
 
@@ -34,8 +34,8 @@ public function testCopyCreatesNewFile()
      */
     public function testCopyFails()
     {
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         $this->filesystem->copy($sourceFilePath, $targetFilePath);
     }
@@ -46,12 +46,12 @@ public function testCopyFails()
     public function testCopyUnreadableFileFails()
     {
         // skip test on Windows; PHP can't easily set file as unreadable on Windows
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('This test cannot run on Windows.');
         }
 
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($sourceFilePath, 'SOURCE FILE');
 
@@ -63,8 +63,8 @@ public function testCopyUnreadableFileFails()
 
     public function testCopyOverridesExistingFileIfModified()
     {
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($sourceFilePath, 'SOURCE FILE');
         file_put_contents($targetFilePath, 'TARGET FILE');
@@ -78,8 +78,8 @@ public function testCopyOverridesExistingFileIfModified()
 
     public function testCopyDoesNotOverrideExistingFileByDefault()
     {
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($sourceFilePath, 'SOURCE FILE');
         file_put_contents($targetFilePath, 'TARGET FILE');
@@ -97,8 +97,8 @@ public function testCopyDoesNotOverrideExistingFileByDefault()
 
     public function testCopyOverridesExistingFileIfForced()
     {
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($sourceFilePath, 'SOURCE FILE');
         file_put_contents($targetFilePath, 'TARGET FILE');
@@ -120,12 +120,12 @@ public function testCopyOverridesExistingFileIfForced()
     public function testCopyWithOverrideWithReadOnlyTargetFails()
     {
         // skip test on Windows; PHP can't easily set file as unwritable on Windows
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('This test cannot run on Windows.');
         }
 
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($sourceFilePath, 'SOURCE FILE');
         file_put_contents($targetFilePath, 'TARGET FILE');
@@ -143,9 +143,9 @@ public function testCopyWithOverrideWithReadOnlyTargetFails()
 
     public function testCopyCreatesTargetDirectoryIfItDoesNotExist()
     {
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFileDirectory = $this->workspace.DIRECTORY_SEPARATOR.'directory';
-        $targetFilePath = $targetFileDirectory.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFileDirectory = $this->workspace.\DIRECTORY_SEPARATOR.'directory';
+        $targetFilePath = $targetFileDirectory.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($sourceFilePath, 'SOURCE FILE');
 
@@ -162,7 +162,7 @@ public function testCopyCreatesTargetDirectoryIfItDoesNotExist()
     public function testCopyForOriginUrlsAndExistingLocalFileDefaultsToCopy()
     {
         $sourceFilePath = 'http://symfony.com/images/common/logo/logo_symfony_header.png';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($targetFilePath, 'TARGET FILE');
 
@@ -175,8 +175,8 @@ public function testCopyForOriginUrlsAndExistingLocalFileDefaultsToCopy()
     public function testMkdirCreatesDirectoriesRecursively()
     {
         $directory = $this->workspace
-            .DIRECTORY_SEPARATOR.'directory'
-            .DIRECTORY_SEPARATOR.'sub_directory';
+            .\DIRECTORY_SEPARATOR.'directory'
+            .\DIRECTORY_SEPARATOR.'sub_directory';
 
         $this->filesystem->mkdir($directory);
 
@@ -185,7 +185,7 @@ public function testMkdirCreatesDirectoriesRecursively()
 
     public function testMkdirCreatesDirectoriesFromArray()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
         $directories = array(
             $basePath.'1', $basePath.'2', $basePath.'3',
         );
@@ -199,7 +199,7 @@ public function testMkdirCreatesDirectoriesFromArray()
 
     public function testMkdirCreatesDirectoriesFromTraversableObject()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
         $directories = new \ArrayObject(array(
             $basePath.'1', $basePath.'2', $basePath.'3',
         ));
@@ -216,7 +216,7 @@ public function testMkdirCreatesDirectoriesFromTraversableObject()
      */
     public function testMkdirCreatesDirectoriesFails()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
         $dir = $basePath.'2';
 
         file_put_contents($dir, '');
@@ -226,7 +226,7 @@ public function testMkdirCreatesDirectoriesFails()
 
     public function testTouchCreatesEmptyFile()
     {
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'1';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'1';
 
         $this->filesystem->touch($file);
 
@@ -238,14 +238,14 @@ public function testTouchCreatesEmptyFile()
      */
     public function testTouchFails()
     {
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'1'.DIRECTORY_SEPARATOR.'2';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'1'.\DIRECTORY_SEPARATOR.'2';
 
         $this->filesystem->touch($file);
     }
 
     public function testTouchCreatesEmptyFilesFromArray()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
         $files = array(
             $basePath.'1', $basePath.'2', $basePath.'3',
         );
@@ -259,7 +259,7 @@ public function testTouchCreatesEmptyFilesFromArray()
 
     public function testTouchCreatesEmptyFilesFromTraversableObject()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
         $files = new \ArrayObject(array(
             $basePath.'1', $basePath.'2', $basePath.'3',
         ));
@@ -273,7 +273,7 @@ public function testTouchCreatesEmptyFilesFromTraversableObject()
 
     public function testRemoveCleansFilesAndDirectoriesIteratively()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR.'directory'.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR.'directory'.\DIRECTORY_SEPARATOR;
 
         mkdir($basePath);
         mkdir($basePath.'dir');
@@ -286,7 +286,7 @@ public function testRemoveCleansFilesAndDirectoriesIteratively()
 
     public function testRemoveCleansArrayOfFilesAndDirectories()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
 
         mkdir($basePath.'dir');
         touch($basePath.'file');
@@ -303,7 +303,7 @@ public function testRemoveCleansArrayOfFilesAndDirectories()
 
     public function testRemoveCleansTraversableObjectOfFilesAndDirectories()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
 
         mkdir($basePath.'dir');
         touch($basePath.'file');
@@ -320,7 +320,7 @@ public function testRemoveCleansTraversableObjectOfFilesAndDirectories()
 
     public function testRemoveIgnoresNonExistingFiles()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
 
         mkdir($basePath.'dir');
 
@@ -337,7 +337,7 @@ public function testRemoveCleansInvalidLinks()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR.'directory'.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR.'directory'.\DIRECTORY_SEPARATOR;
 
         mkdir($basePath);
         mkdir($basePath.'dir');
@@ -350,7 +350,7 @@ public function testRemoveCleansInvalidLinks()
 
         // create symlink to nonexistent dir
         rmdir($basePath.'dir');
-        $this->assertFalse('\\' === DIRECTORY_SEPARATOR ? @readlink($basePath.'dir-link') : is_dir($basePath.'dir-link'));
+        $this->assertFalse('\\' === \DIRECTORY_SEPARATOR ? @readlink($basePath.'dir-link') : is_dir($basePath.'dir-link'));
 
         $this->filesystem->remove($basePath);
 
@@ -359,7 +359,7 @@ public function testRemoveCleansInvalidLinks()
 
     public function testFilesExists()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR.'directory'.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR.'directory'.\DIRECTORY_SEPARATOR;
 
         mkdir($basePath);
         touch($basePath.'file1');
@@ -374,7 +374,7 @@ public function testFilesExists()
      */
     public function testFilesExistsFails()
     {
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Long file names are an issue on Windows');
         }
         $basePath = $this->workspace.'\\directory\\';
@@ -383,7 +383,7 @@ public function testFilesExistsFails()
         $oldPath = getcwd();
         mkdir($basePath);
         chdir($basePath);
-        $file = str_repeat('T', $maxPathLength - strlen($basePath) + 1);
+        $file = str_repeat('T', $maxPathLength - \strlen($basePath) + 1);
         $path = $basePath.$file;
         exec('TYPE NUL >>'.$file); // equivalent of touch, we can not use the php touch() here because it suffers from the same limitation
         $this->longPathNamesWindows[] = $path; // save this so we can clean up later
@@ -393,7 +393,7 @@ public function testFilesExistsFails()
 
     public function testFilesExistsTraversableObjectOfFilesAndDirectories()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
 
         mkdir($basePath.'dir');
         touch($basePath.'file');
@@ -407,7 +407,7 @@ public function testFilesExistsTraversableObjectOfFilesAndDirectories()
 
     public function testFilesNotExistsTraversableObjectOfFilesAndDirectories()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR;
 
         mkdir($basePath.'dir');
         touch($basePath.'file');
@@ -424,7 +424,7 @@ public function testFilesNotExistsTraversableObjectOfFilesAndDirectories()
 
     public function testInvalidFileNotExists()
     {
-        $basePath = $this->workspace.DIRECTORY_SEPARATOR.'directory'.DIRECTORY_SEPARATOR;
+        $basePath = $this->workspace.\DIRECTORY_SEPARATOR.'directory'.\DIRECTORY_SEPARATOR;
 
         $this->assertFalse($this->filesystem->exists($basePath.time()));
     }
@@ -433,9 +433,9 @@ public function testChmodChangesFileMode()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'dir';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
         mkdir($dir);
-        $file = $dir.DIRECTORY_SEPARATOR.'file';
+        $file = $dir.\DIRECTORY_SEPARATOR.'file';
         touch($file);
 
         $this->filesystem->chmod($file, 0400);
@@ -449,7 +449,7 @@ public function testChmodWithWrongModLeavesPreviousPermissionsUntouched()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'file';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'file';
         touch($dir);
 
         $permissions = fileperms($dir);
@@ -463,9 +463,9 @@ public function testChmodRecursive()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'dir';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
         mkdir($dir);
-        $file = $dir.DIRECTORY_SEPARATOR.'file';
+        $file = $dir.\DIRECTORY_SEPARATOR.'file';
         touch($file);
 
         $this->filesystem->chmod($file, 0400, 0000, true);
@@ -479,7 +479,7 @@ public function testChmodAppliesUmask()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
         touch($file);
 
         $this->filesystem->chmod($file, 0770, 0022);
@@ -490,8 +490,8 @@ public function testChmodChangesModeOfArrayOfFiles()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $directory = $this->workspace.DIRECTORY_SEPARATOR.'directory';
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
+        $directory = $this->workspace.\DIRECTORY_SEPARATOR.'directory';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
         $files = array($directory, $file);
 
         mkdir($directory);
@@ -507,8 +507,8 @@ public function testChmodChangesModeOfTraversableFileObject()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $directory = $this->workspace.DIRECTORY_SEPARATOR.'directory';
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
+        $directory = $this->workspace.\DIRECTORY_SEPARATOR.'directory';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
         $files = new \ArrayObject(array($directory, $file));
 
         mkdir($directory);
@@ -524,8 +524,8 @@ public function testChmodChangesZeroModeOnSubdirectoriesOnRecursive()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $directory = $this->workspace.DIRECTORY_SEPARATOR.'directory';
-        $subdirectory = $directory.DIRECTORY_SEPARATOR.'subdirectory';
+        $directory = $this->workspace.\DIRECTORY_SEPARATOR.'directory';
+        $subdirectory = $directory.\DIRECTORY_SEPARATOR.'subdirectory';
 
         mkdir($directory);
         mkdir($subdirectory);
@@ -540,7 +540,7 @@ public function testChown()
     {
         $this->markAsSkippedIfPosixIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'dir';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
         mkdir($dir);
 
         $owner = $this->getFileOwner($dir);
@@ -553,9 +553,9 @@ public function testChownRecursive()
     {
         $this->markAsSkippedIfPosixIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'dir';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
         mkdir($dir);
-        $file = $dir.DIRECTORY_SEPARATOR.'file';
+        $file = $dir.\DIRECTORY_SEPARATOR.'file';
         touch($file);
 
         $owner = $this->getFileOwner($dir);
@@ -568,8 +568,8 @@ public function testChownSymlink()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -585,8 +585,8 @@ public function testChownLink()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -605,8 +605,8 @@ public function testChownSymlinkFails()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -622,8 +622,8 @@ public function testChownLinkFails()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -639,7 +639,7 @@ public function testChownFail()
     {
         $this->markAsSkippedIfPosixIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'dir';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
         mkdir($dir);
 
         $this->filesystem->chown($dir, 'user'.time().mt_rand(1000, 9999));
@@ -649,7 +649,7 @@ public function testChgrp()
     {
         $this->markAsSkippedIfPosixIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'dir';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
         mkdir($dir);
 
         $group = $this->getFileGroup($dir);
@@ -662,9 +662,9 @@ public function testChgrpRecursive()
     {
         $this->markAsSkippedIfPosixIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'dir';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
         mkdir($dir);
-        $file = $dir.DIRECTORY_SEPARATOR.'file';
+        $file = $dir.\DIRECTORY_SEPARATOR.'file';
         touch($file);
 
         $group = $this->getFileGroup($dir);
@@ -677,8 +677,8 @@ public function testChgrpSymlink()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -694,8 +694,8 @@ public function testChgrpLink()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -714,8 +714,8 @@ public function testChgrpSymlinkFails()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -731,8 +731,8 @@ public function testChgrpLinkFails()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -748,7 +748,7 @@ public function testChgrpFail()
     {
         $this->markAsSkippedIfPosixIsMissing();
 
-        $dir = $this->workspace.DIRECTORY_SEPARATOR.'dir';
+        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
         mkdir($dir);
 
         $this->filesystem->chgrp($dir, 'user'.time().mt_rand(1000, 9999));
@@ -756,8 +756,8 @@ public function testChgrpFail()
 
     public function testRename()
     {
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $newPath = $this->workspace.DIRECTORY_SEPARATOR.'new_file';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $newPath = $this->workspace.\DIRECTORY_SEPARATOR.'new_file';
         touch($file);
 
         $this->filesystem->rename($file, $newPath);
@@ -771,8 +771,8 @@ public function testRename()
      */
     public function testRenameThrowsExceptionIfTargetAlreadyExists()
     {
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $newPath = $this->workspace.DIRECTORY_SEPARATOR.'new_file';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $newPath = $this->workspace.\DIRECTORY_SEPARATOR.'new_file';
 
         touch($file);
         touch($newPath);
@@ -782,8 +782,8 @@ public function testRenameThrowsExceptionIfTargetAlreadyExists()
 
     public function testRenameOverwritesTheTargetIfItAlreadyExists()
     {
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $newPath = $this->workspace.DIRECTORY_SEPARATOR.'new_file';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $newPath = $this->workspace.\DIRECTORY_SEPARATOR.'new_file';
 
         touch($file);
         touch($newPath);
@@ -799,20 +799,20 @@ public function testRenameOverwritesTheTargetIfItAlreadyExists()
      */
     public function testRenameThrowsExceptionOnError()
     {
-        $file = $this->workspace.DIRECTORY_SEPARATOR.uniqid('fs_test_', true);
-        $newPath = $this->workspace.DIRECTORY_SEPARATOR.'new_file';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.uniqid('fs_test_', true);
+        $newPath = $this->workspace.\DIRECTORY_SEPARATOR.'new_file';
 
         $this->filesystem->rename($file, $newPath);
     }
 
     public function testSymlink()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does not support creating "broken" symlinks');
         }
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         // $file does not exists right now: creating "broken" links is a wanted feature
         $this->filesystem->symlink($file, $link);
@@ -832,7 +832,7 @@ public function testRemoveSymlink()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         $this->filesystem->remove($link);
 
@@ -845,8 +845,8 @@ public function testSymlinkIsOverwrittenIfPointsToDifferentTarget()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
         symlink($this->workspace, $link);
@@ -861,8 +861,8 @@ public function testSymlinkIsNotOverwrittenIfAlreadyCreated()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
         symlink($file, $link);
@@ -877,9 +877,9 @@ public function testSymlinkCreatesTargetDirectoryIfItDoesNotExist()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link1 = $this->workspace.DIRECTORY_SEPARATOR.'dir'.DIRECTORY_SEPARATOR.'link';
-        $link2 = $this->workspace.DIRECTORY_SEPARATOR.'dir'.DIRECTORY_SEPARATOR.'subdir'.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link1 = $this->workspace.\DIRECTORY_SEPARATOR.'dir'.\DIRECTORY_SEPARATOR.'link';
+        $link2 = $this->workspace.\DIRECTORY_SEPARATOR.'dir'.\DIRECTORY_SEPARATOR.'subdir'.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -896,8 +896,8 @@ public function testLink()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
         $this->filesystem->hardlink($file, $link);
@@ -913,7 +913,7 @@ public function testRemoveLink()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         $this->filesystem->remove($link);
 
@@ -924,9 +924,9 @@ public function testLinkIsOverwrittenIfPointsToDifferentTarget()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $file2 = $this->workspace.DIRECTORY_SEPARATOR.'file2';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $file2 = $this->workspace.\DIRECTORY_SEPARATOR.'file2';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
         touch($file2);
@@ -942,8 +942,8 @@ public function testLinkIsNotOverwrittenIfAlreadyCreated()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
         link($file, $link);
@@ -958,9 +958,9 @@ public function testLinkWithSeveralTargets()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link1 = $this->workspace.DIRECTORY_SEPARATOR.'link';
-        $link2 = $this->workspace.DIRECTORY_SEPARATOR.'link2';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link1 = $this->workspace.\DIRECTORY_SEPARATOR.'link';
+        $link2 = $this->workspace.\DIRECTORY_SEPARATOR.'link2';
 
         touch($file);
 
@@ -976,8 +976,8 @@ public function testLinkWithSameTarget()
     {
         $this->markAsSkippedIfLinkIsMissing();
 
-        $file = $this->workspace.DIRECTORY_SEPARATOR.'file';
-        $link = $this->workspace.DIRECTORY_SEPARATOR.'link';
+        $file = $this->workspace.\DIRECTORY_SEPARATOR.'file';
+        $link = $this->workspace.\DIRECTORY_SEPARATOR.'link';
 
         touch($file);
 
@@ -992,7 +992,7 @@ public function testReadRelativeLink()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Relative symbolic links are not supported on Windows');
         }
 
@@ -1034,7 +1034,7 @@ public function testReadBrokenLink()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does not support creating "broken" symlinks');
         }
 
@@ -1130,7 +1130,7 @@ public function providePathsForMakePathRelative()
             array('C:/../../aa/../bb/cc', 'C:/aa/dd/..', '../bb/cc/'),
         );
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $paths[] = array('c:\var\lib/symfony/src/Symfony/', 'c:/var/lib/symfony/', 'src/Symfony/');
         }
 
@@ -1157,8 +1157,8 @@ public function testMakePathRelativeWithRelativeEndPath()
 
     public function testMirrorCopiesFilesAndDirectoriesRecursively()
     {
-        $sourcePath = $this->workspace.DIRECTORY_SEPARATOR.'source'.DIRECTORY_SEPARATOR;
-        $directory = $sourcePath.'directory'.DIRECTORY_SEPARATOR;
+        $sourcePath = $this->workspace.\DIRECTORY_SEPARATOR.'source'.\DIRECTORY_SEPARATOR;
+        $directory = $sourcePath.'directory'.\DIRECTORY_SEPARATOR;
         $file1 = $directory.'file1';
         $file2 = $sourcePath.'file2';
 
@@ -1167,41 +1167,41 @@ public function testMirrorCopiesFilesAndDirectoriesRecursively()
         file_put_contents($file1, 'FILE1');
         file_put_contents($file2, 'FILE2');
 
-        $targetPath = $this->workspace.DIRECTORY_SEPARATOR.'target'.DIRECTORY_SEPARATOR;
+        $targetPath = $this->workspace.\DIRECTORY_SEPARATOR.'target'.\DIRECTORY_SEPARATOR;
 
         $this->filesystem->mirror($sourcePath, $targetPath);
 
         $this->assertTrue(is_dir($targetPath));
         $this->assertTrue(is_dir($targetPath.'directory'));
-        $this->assertFileEquals($file1, $targetPath.'directory'.DIRECTORY_SEPARATOR.'file1');
+        $this->assertFileEquals($file1, $targetPath.'directory'.\DIRECTORY_SEPARATOR.'file1');
         $this->assertFileEquals($file2, $targetPath.'file2');
 
         $this->filesystem->remove($file1);
 
         $this->filesystem->mirror($sourcePath, $targetPath, null, array('delete' => false));
-        $this->assertTrue($this->filesystem->exists($targetPath.'directory'.DIRECTORY_SEPARATOR.'file1'));
+        $this->assertTrue($this->filesystem->exists($targetPath.'directory'.\DIRECTORY_SEPARATOR.'file1'));
 
         $this->filesystem->mirror($sourcePath, $targetPath, null, array('delete' => true));
-        $this->assertFalse($this->filesystem->exists($targetPath.'directory'.DIRECTORY_SEPARATOR.'file1'));
+        $this->assertFalse($this->filesystem->exists($targetPath.'directory'.\DIRECTORY_SEPARATOR.'file1'));
 
         file_put_contents($file1, 'FILE1');
 
         $this->filesystem->mirror($sourcePath, $targetPath, null, array('delete' => true));
-        $this->assertTrue($this->filesystem->exists($targetPath.'directory'.DIRECTORY_SEPARATOR.'file1'));
+        $this->assertTrue($this->filesystem->exists($targetPath.'directory'.\DIRECTORY_SEPARATOR.'file1'));
 
         $this->filesystem->remove($directory);
         $this->filesystem->mirror($sourcePath, $targetPath, null, array('delete' => true));
         $this->assertFalse($this->filesystem->exists($targetPath.'directory'));
-        $this->assertFalse($this->filesystem->exists($targetPath.'directory'.DIRECTORY_SEPARATOR.'file1'));
+        $this->assertFalse($this->filesystem->exists($targetPath.'directory'.\DIRECTORY_SEPARATOR.'file1'));
     }
 
     public function testMirrorCreatesEmptyDirectory()
     {
-        $sourcePath = $this->workspace.DIRECTORY_SEPARATOR.'source'.DIRECTORY_SEPARATOR;
+        $sourcePath = $this->workspace.\DIRECTORY_SEPARATOR.'source'.\DIRECTORY_SEPARATOR;
 
         mkdir($sourcePath);
 
-        $targetPath = $this->workspace.DIRECTORY_SEPARATOR.'target'.DIRECTORY_SEPARATOR;
+        $targetPath = $this->workspace.\DIRECTORY_SEPARATOR.'target'.\DIRECTORY_SEPARATOR;
 
         $this->filesystem->mirror($sourcePath, $targetPath);
 
@@ -1214,46 +1214,46 @@ public function testMirrorCopiesLinks()
     {
         $this->markAsSkippedIfSymlinkIsMissing();
 
-        $sourcePath = $this->workspace.DIRECTORY_SEPARATOR.'source'.DIRECTORY_SEPARATOR;
+        $sourcePath = $this->workspace.\DIRECTORY_SEPARATOR.'source'.\DIRECTORY_SEPARATOR;
 
         mkdir($sourcePath);
         file_put_contents($sourcePath.'file1', 'FILE1');
         symlink($sourcePath.'file1', $sourcePath.'link1');
 
-        $targetPath = $this->workspace.DIRECTORY_SEPARATOR.'target'.DIRECTORY_SEPARATOR;
+        $targetPath = $this->workspace.\DIRECTORY_SEPARATOR.'target'.\DIRECTORY_SEPARATOR;
 
         $this->filesystem->mirror($sourcePath, $targetPath);
 
         $this->assertTrue(is_dir($targetPath));
         $this->assertFileEquals($sourcePath.'file1', $targetPath.'link1');
-        $this->assertTrue(is_link($targetPath.DIRECTORY_SEPARATOR.'link1'));
+        $this->assertTrue(is_link($targetPath.\DIRECTORY_SEPARATOR.'link1'));
     }
 
     public function testMirrorCopiesLinkedDirectoryContents()
     {
         $this->markAsSkippedIfSymlinkIsMissing(true);
 
-        $sourcePath = $this->workspace.DIRECTORY_SEPARATOR.'source'.DIRECTORY_SEPARATOR;
+        $sourcePath = $this->workspace.\DIRECTORY_SEPARATOR.'source'.\DIRECTORY_SEPARATOR;
 
         mkdir($sourcePath.'nested/', 0777, true);
         file_put_contents($sourcePath.'/nested/file1.txt', 'FILE1');
         // Note: We symlink directory, not file
         symlink($sourcePath.'nested', $sourcePath.'link1');
 
-        $targetPath = $this->workspace.DIRECTORY_SEPARATOR.'target'.DIRECTORY_SEPARATOR;
+        $targetPath = $this->workspace.\DIRECTORY_SEPARATOR.'target'.\DIRECTORY_SEPARATOR;
 
         $this->filesystem->mirror($sourcePath, $targetPath);
 
         $this->assertTrue(is_dir($targetPath));
         $this->assertFileEquals($sourcePath.'/nested/file1.txt', $targetPath.'link1/file1.txt');
-        $this->assertTrue(is_link($targetPath.DIRECTORY_SEPARATOR.'link1'));
+        $this->assertTrue(is_link($targetPath.\DIRECTORY_SEPARATOR.'link1'));
     }
 
     public function testMirrorCopiesRelativeLinkedContents()
     {
         $this->markAsSkippedIfSymlinkIsMissing(true);
 
-        $sourcePath = $this->workspace.DIRECTORY_SEPARATOR.'source'.DIRECTORY_SEPARATOR;
+        $sourcePath = $this->workspace.\DIRECTORY_SEPARATOR.'source'.\DIRECTORY_SEPARATOR;
         $oldPath = getcwd();
 
         mkdir($sourcePath.'nested/', 0777, true);
@@ -1264,25 +1264,25 @@ public function testMirrorCopiesRelativeLinkedContents()
 
         chdir($oldPath);
 
-        $targetPath = $this->workspace.DIRECTORY_SEPARATOR.'target'.DIRECTORY_SEPARATOR;
+        $targetPath = $this->workspace.\DIRECTORY_SEPARATOR.'target'.\DIRECTORY_SEPARATOR;
 
         $this->filesystem->mirror($sourcePath, $targetPath);
 
         $this->assertTrue(is_dir($targetPath));
         $this->assertFileEquals($sourcePath.'/nested/file1.txt', $targetPath.'link1/file1.txt');
-        $this->assertTrue(is_link($targetPath.DIRECTORY_SEPARATOR.'link1'));
-        $this->assertEquals('\\' === DIRECTORY_SEPARATOR ? realpath($sourcePath.'\nested') : 'nested', readlink($targetPath.DIRECTORY_SEPARATOR.'link1'));
+        $this->assertTrue(is_link($targetPath.\DIRECTORY_SEPARATOR.'link1'));
+        $this->assertEquals('\\' === \DIRECTORY_SEPARATOR ? realpath($sourcePath.'\nested') : 'nested', readlink($targetPath.\DIRECTORY_SEPARATOR.'link1'));
     }
 
     public function testMirrorContentsWithSameNameAsSourceOrTargetWithoutDeleteOption()
     {
-        $sourcePath = $this->workspace.DIRECTORY_SEPARATOR.'source'.DIRECTORY_SEPARATOR;
+        $sourcePath = $this->workspace.\DIRECTORY_SEPARATOR.'source'.\DIRECTORY_SEPARATOR;
 
         mkdir($sourcePath);
         touch($sourcePath.'source');
         touch($sourcePath.'target');
 
-        $targetPath = $this->workspace.DIRECTORY_SEPARATOR.'target'.DIRECTORY_SEPARATOR;
+        $targetPath = $this->workspace.\DIRECTORY_SEPARATOR.'target'.\DIRECTORY_SEPARATOR;
 
         $oldPath = getcwd();
         chdir($this->workspace);
@@ -1298,12 +1298,12 @@ public function testMirrorContentsWithSameNameAsSourceOrTargetWithoutDeleteOptio
 
     public function testMirrorContentsWithSameNameAsSourceOrTargetWithDeleteOption()
     {
-        $sourcePath = $this->workspace.DIRECTORY_SEPARATOR.'source'.DIRECTORY_SEPARATOR;
+        $sourcePath = $this->workspace.\DIRECTORY_SEPARATOR.'source'.\DIRECTORY_SEPARATOR;
 
         mkdir($sourcePath);
         touch($sourcePath.'source');
 
-        $targetPath = $this->workspace.DIRECTORY_SEPARATOR.'target'.DIRECTORY_SEPARATOR;
+        $targetPath = $this->workspace.\DIRECTORY_SEPARATOR.'target'.\DIRECTORY_SEPARATOR;
 
         mkdir($targetPath);
         touch($targetPath.'source');
@@ -1436,11 +1436,11 @@ public function testTempnamWithHTTPSchemeFails()
     public function testTempnamOnUnwritableFallsBackToSysTmp()
     {
         $scheme = 'file://';
-        $dirname = $scheme.$this->workspace.DIRECTORY_SEPARATOR.'does_not_exist';
+        $dirname = $scheme.$this->workspace.\DIRECTORY_SEPARATOR.'does_not_exist';
 
         $filename = $this->filesystem->tempnam($dirname, 'bar');
         $realTempDir = realpath(sys_get_temp_dir());
-        $this->assertStringStartsWith(rtrim($scheme.$realTempDir, DIRECTORY_SEPARATOR), $filename);
+        $this->assertStringStartsWith(rtrim($scheme.$realTempDir, \DIRECTORY_SEPARATOR), $filename);
         $this->assertFileExists($filename);
 
         // Tear down
@@ -1449,10 +1449,10 @@ public function testTempnamOnUnwritableFallsBackToSysTmp()
 
     public function testDumpFile()
     {
-        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo'.DIRECTORY_SEPARATOR.'baz.txt';
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'baz.txt';
 
         // skip mode check on Windows
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $oldMask = umask(0002);
         }
 
@@ -1461,7 +1461,7 @@ public function testDumpFile()
         $this->assertStringEqualsFile($filename, 'bar');
 
         // skip mode check on Windows
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $this->assertFilePermissions(664, $filename);
             umask($oldMask);
         }
@@ -1469,7 +1469,7 @@ public function testDumpFile()
 
     public function testDumpFileOverwritesAnExistingFile()
     {
-        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo.txt';
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo.txt';
         file_put_contents($filename, 'FOO BAR');
 
         $this->filesystem->dumpFile($filename, 'bar');
@@ -1481,7 +1481,7 @@ public function testDumpFileOverwritesAnExistingFile()
     public function testDumpFileWithFileScheme()
     {
         $scheme = 'file://';
-        $filename = $scheme.$this->workspace.DIRECTORY_SEPARATOR.'foo'.DIRECTORY_SEPARATOR.'baz.txt';
+        $filename = $scheme.$this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'baz.txt';
 
         $this->filesystem->dumpFile($filename, 'bar');
 
@@ -1492,7 +1492,7 @@ public function testDumpFileWithFileScheme()
     public function testDumpFileWithZlibScheme()
     {
         $scheme = 'compress.zlib://';
-        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo'.DIRECTORY_SEPARATOR.'baz.txt';
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'baz.txt';
 
         $this->filesystem->dumpFile($filename, 'bar');
 
@@ -1503,10 +1503,10 @@ public function testDumpFileWithZlibScheme()
 
     public function testAppendToFile()
     {
-        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo'.DIRECTORY_SEPARATOR.'bar.txt';
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'bar.txt';
 
         // skip mode check on Windows
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $oldMask = umask(0002);
         }
 
@@ -1518,7 +1518,7 @@ public function testAppendToFile()
         $this->assertStringEqualsFile($filename, 'foobar');
 
         // skip mode check on Windows
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $this->assertFilePermissions(664, $filename);
             umask($oldMask);
         }
@@ -1527,7 +1527,7 @@ public function testAppendToFile()
     public function testAppendToFileWithScheme()
     {
         $scheme = 'file://';
-        $filename = $scheme.$this->workspace.DIRECTORY_SEPARATOR.'foo'.DIRECTORY_SEPARATOR.'baz.txt';
+        $filename = $scheme.$this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'baz.txt';
         $this->filesystem->dumpFile($filename, 'foo');
 
         $this->filesystem->appendToFile($filename, 'bar');
@@ -1539,7 +1539,7 @@ public function testAppendToFileWithScheme()
     public function testAppendToFileWithZlibScheme()
     {
         $scheme = 'compress.zlib://';
-        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo'.DIRECTORY_SEPARATOR.'baz.txt';
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'baz.txt';
         $this->filesystem->dumpFile($filename, 'foo');
 
         // Zlib stat uses file:// wrapper so remove it
@@ -1553,17 +1553,17 @@ public function testAppendToFileWithZlibScheme()
 
     public function testAppendToFileCreateTheFileIfNotExists()
     {
-        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo'.DIRECTORY_SEPARATOR.'bar.txt';
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo'.\DIRECTORY_SEPARATOR.'bar.txt';
 
         // skip mode check on Windows
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $oldMask = umask(0002);
         }
 
         $this->filesystem->appendToFile($filename, 'bar');
 
         // skip mode check on Windows
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $this->assertFilePermissions(664, $filename);
             umask($oldMask);
         }
@@ -1576,7 +1576,7 @@ public function testDumpKeepsExistingPermissionsWhenOverwritingAnExistingFile()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo.txt';
+        $filename = $this->workspace.\DIRECTORY_SEPARATOR.'foo.txt';
         file_put_contents($filename, 'FOO BAR');
         chmod($filename, 0745);
 
@@ -1589,8 +1589,8 @@ public function testCopyShouldKeepExecutionPermission()
     {
         $this->markAsSkippedIfChmodIsMissing();
 
-        $sourceFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_source_file';
-        $targetFilePath = $this->workspace.DIRECTORY_SEPARATOR.'copy_target_file';
+        $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
+        $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
         file_put_contents($sourceFilePath, 'SOURCE FILE');
         chmod($sourceFilePath, 0745);
@@ -1605,6 +1605,6 @@ public function testCopyShouldKeepExecutionPermission()
      */
     private function normalize(string $path): string
     {
-        return str_replace('/', DIRECTORY_SEPARATOR, $path);
+        return str_replace('/', \DIRECTORY_SEPARATOR, $path);
     }
 }
diff --git a/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php b/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
index cde01e50eb8a..e55c26677795 100644
--- a/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
+++ b/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
@@ -42,13 +42,13 @@ class FilesystemTestCase extends TestCase
 
     public static function setUpBeforeClass()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             self::$linkOnWindows = true;
             $originFile = tempnam(sys_get_temp_dir(), 'li');
             $targetFile = tempnam(sys_get_temp_dir(), 'li');
             if (true !== @link($originFile, $targetFile)) {
                 $report = error_get_last();
-                if (is_array($report) && false !== strpos($report['message'], 'error code(1314)')) {
+                if (\is_array($report) && false !== strpos($report['message'], 'error code(1314)')) {
                     self::$linkOnWindows = false;
                 }
             } else {
@@ -60,7 +60,7 @@ public static function setUpBeforeClass()
             $targetDir = tempnam(sys_get_temp_dir(), 'sl');
             if (true !== @symlink($originDir, $targetDir)) {
                 $report = error_get_last();
-                if (is_array($report) && false !== strpos($report['message'], 'error code(1314)')) {
+                if (\is_array($report) && false !== strpos($report['message'], 'error code(1314)')) {
                     self::$symlinkOnWindows = false;
                 }
             } else {
@@ -129,37 +129,37 @@ protected function getFileGroup($filepath)
 
     protected function markAsSkippedIfLinkIsMissing()
     {
-        if (!function_exists('link')) {
+        if (!\function_exists('link')) {
             $this->markTestSkipped('link is not supported');
         }
 
-        if ('\\' === DIRECTORY_SEPARATOR && false === self::$linkOnWindows) {
+        if ('\\' === \DIRECTORY_SEPARATOR && false === self::$linkOnWindows) {
             $this->markTestSkipped('link requires "Create hard links" privilege on windows');
         }
     }
 
     protected function markAsSkippedIfSymlinkIsMissing($relative = false)
     {
-        if ('\\' === DIRECTORY_SEPARATOR && false === self::$symlinkOnWindows) {
+        if ('\\' === \DIRECTORY_SEPARATOR && false === self::$symlinkOnWindows) {
             $this->markTestSkipped('symlink requires "Create symbolic links" privilege on Windows');
         }
 
         // https://bugs.php.net/bug.php?id=69473
-        if ($relative && '\\' === DIRECTORY_SEPARATOR && 1 === PHP_ZTS) {
+        if ($relative && '\\' === \DIRECTORY_SEPARATOR && 1 === PHP_ZTS) {
             $this->markTestSkipped('symlink does not support relative paths on thread safe Windows PHP versions');
         }
     }
 
     protected function markAsSkippedIfChmodIsMissing()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('chmod is not supported on Windows');
         }
     }
 
     protected function markAsSkippedIfPosixIsMissing()
     {
-        if (!function_exists('posix_isatty')) {
+        if (!\function_exists('posix_isatty')) {
             $this->markTestSkipped('Function posix_isatty is required.');
         }
     }
diff --git a/src/Symfony/Component/Finder/Comparator/Comparator.php b/src/Symfony/Component/Finder/Comparator/Comparator.php
index 4f5e1ffe1239..ea37566df888 100644
--- a/src/Symfony/Component/Finder/Comparator/Comparator.php
+++ b/src/Symfony/Component/Finder/Comparator/Comparator.php
@@ -64,7 +64,7 @@ public function setOperator($operator)
             $operator = '==';
         }
 
-        if (!in_array($operator, array('>', '<', '>=', '<=', '==', '!='))) {
+        if (!\in_array($operator, array('>', '<', '>=', '<=', '==', '!='))) {
             throw new \InvalidArgumentException(sprintf('Invalid operator "%s".', $operator));
         }
 
diff --git a/src/Symfony/Component/Finder/Finder.php b/src/Symfony/Component/Finder/Finder.php
index 105acc70ce41..056c836d3fdb 100644
--- a/src/Symfony/Component/Finder/Finder.php
+++ b/src/Symfony/Component/Finder/Finder.php
@@ -541,7 +541,7 @@ public function in($dirs)
         foreach ((array) $dirs as $dir) {
             if (is_dir($dir)) {
                 $resolvedDirs[] = $this->normalizeDir($dir);
-            } elseif ($glob = glob($dir, (defined('GLOB_BRACE') ? GLOB_BRACE : 0) | GLOB_ONLYDIR)) {
+            } elseif ($glob = glob($dir, (\defined('GLOB_BRACE') ? GLOB_BRACE : 0) | GLOB_ONLYDIR)) {
                 $resolvedDirs = array_merge($resolvedDirs, array_map(array($this, 'normalizeDir'), $glob));
             } else {
                 throw new \InvalidArgumentException(sprintf('The "%s" directory does not exist.', $dir));
@@ -564,11 +564,11 @@ public function in($dirs)
      */
     public function getIterator()
     {
-        if (0 === count($this->dirs) && 0 === count($this->iterators)) {
+        if (0 === \count($this->dirs) && 0 === \count($this->iterators)) {
             throw new \LogicException('You must call one of in() or append() methods before iterating over a Finder.');
         }
 
-        if (1 === count($this->dirs) && 0 === count($this->iterators)) {
+        if (1 === \count($this->dirs) && 0 === \count($this->iterators)) {
             return $this->searchInDirectory($this->dirs[0]);
         }
 
@@ -601,7 +601,7 @@ public function append($iterator)
             $this->iterators[] = $iterator->getIterator();
         } elseif ($iterator instanceof \Iterator) {
             $this->iterators[] = $iterator;
-        } elseif ($iterator instanceof \Traversable || is_array($iterator)) {
+        } elseif ($iterator instanceof \Traversable || \is_array($iterator)) {
             $it = new \ArrayIterator();
             foreach ($iterator as $file) {
                 $it->append($file instanceof \SplFileInfo ? $file : new \SplFileInfo($file));
diff --git a/src/Symfony/Component/Finder/Glob.php b/src/Symfony/Component/Finder/Glob.php
index df8b86fa5f1a..d8df62bfea63 100644
--- a/src/Symfony/Component/Finder/Glob.php
+++ b/src/Symfony/Component/Finder/Glob.php
@@ -51,7 +51,7 @@ public static function toRegex($glob, $strictLeadingDot = true, $strictWildcardS
         $escaping = false;
         $inCurlies = 0;
         $regex = '';
-        $sizeGlob = strlen($glob);
+        $sizeGlob = \strlen($glob);
         for ($i = 0; $i < $sizeGlob; ++$i) {
             $car = $glob[$i];
             if ($firstByte && $strictLeadingDot && '.' !== $car) {
diff --git a/src/Symfony/Component/Finder/Iterator/CustomFilterIterator.php b/src/Symfony/Component/Finder/Iterator/CustomFilterIterator.php
index 031bc15710f2..77bd3ac873c6 100644
--- a/src/Symfony/Component/Finder/Iterator/CustomFilterIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/CustomFilterIterator.php
@@ -32,7 +32,7 @@ class CustomFilterIterator extends \FilterIterator
     public function __construct(\Iterator $iterator, array $filters)
     {
         foreach ($filters as $filter) {
-            if (!is_callable($filter)) {
+            if (!\is_callable($filter)) {
                 throw new \InvalidArgumentException('Invalid PHP callback.');
             }
         }
@@ -51,7 +51,7 @@ public function accept()
         $fileinfo = $this->current();
 
         foreach ($this->filters as $filter) {
-            if (false === call_user_func($filter, $fileinfo)) {
+            if (false === \call_user_func($filter, $fileinfo)) {
                 return false;
             }
         }
diff --git a/src/Symfony/Component/Finder/Iterator/PathFilterIterator.php b/src/Symfony/Component/Finder/Iterator/PathFilterIterator.php
index dadfc8ed7f28..3fda557be366 100644
--- a/src/Symfony/Component/Finder/Iterator/PathFilterIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/PathFilterIterator.php
@@ -28,7 +28,7 @@ public function accept()
     {
         $filename = $this->current()->getRelativePathname();
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $filename = str_replace('\\', '/', $filename);
         }
 
diff --git a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
index acd5a37634ab..844ba4692e1b 100644
--- a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
@@ -48,8 +48,8 @@ public function __construct(string $path, int $flags, bool $ignoreUnreadableDirs
         parent::__construct($path, $flags);
         $this->ignoreUnreadableDirs = $ignoreUnreadableDirs;
         $this->rootPath = $path;
-        if ('/' !== DIRECTORY_SEPARATOR && !($flags & self::UNIX_PATHS)) {
-            $this->directorySeparator = DIRECTORY_SEPARATOR;
+        if ('/' !== \DIRECTORY_SEPARATOR && !($flags & self::UNIX_PATHS)) {
+            $this->directorySeparator = \DIRECTORY_SEPARATOR;
         }
     }
 
diff --git a/src/Symfony/Component/Finder/Iterator/SortableIterator.php b/src/Symfony/Component/Finder/Iterator/SortableIterator.php
index c2f54b937652..53f8e31c6c42 100644
--- a/src/Symfony/Component/Finder/Iterator/SortableIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/SortableIterator.php
@@ -63,7 +63,7 @@ public function __construct(\Traversable $iterator, $sort)
             $this->sort = function ($a, $b) {
                 return $a->getMTime() - $b->getMTime();
             };
-        } elseif (is_callable($sort)) {
+        } elseif (\is_callable($sort)) {
             $this->sort = $sort;
         } else {
             throw new \InvalidArgumentException('The SortableIterator takes a PHP callable or a valid built-in sort algorithm as an argument.');
diff --git a/src/Symfony/Component/Finder/Tests/FinderTest.php b/src/Symfony/Component/Finder/Tests/FinderTest.php
index c7908fa86743..fbdcc36e6bad 100644
--- a/src/Symfony/Component/Finder/Tests/FinderTest.php
+++ b/src/Symfony/Component/Finder/Tests/FinderTest.php
@@ -58,7 +58,7 @@ public function testRemoveTrailingSlash()
 
     public function testSymlinksNotResolved()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('symlinks are not supported on Windows');
         }
 
@@ -265,7 +265,7 @@ public function testFilter()
 
     public function testFollowLinks()
     {
-        if ('\\' == DIRECTORY_SEPARATOR) {
+        if ('\\' == \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('symlinks are not supported on Windows');
         }
 
@@ -280,9 +280,9 @@ public function testIn()
         $iterator = $finder->files()->name('*.php')->depth('< 1')->in(array(self::$tmpDir, __DIR__))->getIterator();
 
         $expected = array(
-            self::$tmpDir.DIRECTORY_SEPARATOR.'test.php',
-            __DIR__.DIRECTORY_SEPARATOR.'FinderTest.php',
-            __DIR__.DIRECTORY_SEPARATOR.'GlobTest.php',
+            self::$tmpDir.\DIRECTORY_SEPARATOR.'test.php',
+            __DIR__.\DIRECTORY_SEPARATOR.'FinderTest.php',
+            __DIR__.\DIRECTORY_SEPARATOR.'GlobTest.php',
         );
 
         $this->assertIterator($expected, $iterator);
@@ -384,7 +384,7 @@ public function testRelativePathname()
             $paths[] = $file->getRelativePathname();
         }
 
-        $ref = array('test.php', 'toto', 'test.py', 'foo', 'foo'.DIRECTORY_SEPARATOR.'bar.tmp', 'foo bar');
+        $ref = array('test.php', 'toto', 'test.py', 'foo', 'foo'.\DIRECTORY_SEPARATOR.'bar.tmp', 'foo bar');
 
         sort($paths);
         sort($ref);
@@ -395,7 +395,7 @@ public function testRelativePathname()
     public function testAppendWithAFinder()
     {
         $finder = $this->buildFinder();
-        $finder->files()->in(self::$tmpDir.DIRECTORY_SEPARATOR.'foo');
+        $finder->files()->in(self::$tmpDir.\DIRECTORY_SEPARATOR.'foo');
 
         $finder1 = $this->buildFinder();
         $finder1->directories()->in(self::$tmpDir);
@@ -408,7 +408,7 @@ public function testAppendWithAFinder()
     public function testAppendWithAnArray()
     {
         $finder = $this->buildFinder();
-        $finder->files()->in(self::$tmpDir.DIRECTORY_SEPARATOR.'foo');
+        $finder->files()->in(self::$tmpDir.\DIRECTORY_SEPARATOR.'foo');
 
         $finder->append($this->toAbsolute(array('foo', 'toto')));
 
@@ -423,7 +423,7 @@ public function testAppendReturnsAFinder()
     public function testAppendDoesNotRequireIn()
     {
         $finder = $this->buildFinder();
-        $finder->in(self::$tmpDir.DIRECTORY_SEPARATOR.'foo');
+        $finder->in(self::$tmpDir.\DIRECTORY_SEPARATOR.'foo');
 
         $finder1 = Finder::create()->append($finder);
 
@@ -444,7 +444,7 @@ public function testCountDirectories()
 
     public function testCountFiles()
     {
-        $files = Finder::create()->files()->in(__DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $files = Finder::create()->files()->in(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
         $i = 0;
 
         foreach ($files as $file) {
@@ -460,7 +460,7 @@ public function testCountFiles()
     public function testCountWithoutIn()
     {
         $finder = Finder::create()->files();
-        count($finder);
+        \count($finder);
     }
 
     public function testHasResults()
@@ -483,7 +483,7 @@ public function testNoResults()
     public function testContains($matchPatterns, $noMatchPatterns, $expected)
     {
         $finder = $this->buildFinder();
-        $finder->in(__DIR__.DIRECTORY_SEPARATOR.'Fixtures')
+        $finder->in(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures')
             ->name('*.txt')->sortByName()
             ->contains($matchPatterns)
             ->notContains($noMatchPatterns);
@@ -546,15 +546,15 @@ public function testMultipleLocationsWithSubDirectories()
     {
         $locations = array(
             __DIR__.'/Fixtures/one',
-            self::$tmpDir.DIRECTORY_SEPARATOR.'toto',
+            self::$tmpDir.\DIRECTORY_SEPARATOR.'toto',
         );
 
         $finder = $this->buildFinder();
         $finder->in($locations)->depth('< 10')->name('*.neon');
 
         $expected = array(
-            __DIR__.'/Fixtures/one'.DIRECTORY_SEPARATOR.'b'.DIRECTORY_SEPARATOR.'c.neon',
-            __DIR__.'/Fixtures/one'.DIRECTORY_SEPARATOR.'b'.DIRECTORY_SEPARATOR.'d.neon',
+            __DIR__.'/Fixtures/one'.\DIRECTORY_SEPARATOR.'b'.\DIRECTORY_SEPARATOR.'c.neon',
+            __DIR__.'/Fixtures/one'.\DIRECTORY_SEPARATOR.'b'.\DIRECTORY_SEPARATOR.'d.neon',
         );
 
         $this->assertIterator($expected, $finder);
@@ -575,10 +575,10 @@ public function testIteratorKeys()
     public function testRegexSpecialCharsLocationWithPathRestrictionContainingStartFlag()
     {
         $finder = $this->buildFinder();
-        $finder->in(__DIR__.DIRECTORY_SEPARATOR.'Fixtures'.DIRECTORY_SEPARATOR.'r+e.gex[c]a(r)s')
+        $finder->in(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR.'r+e.gex[c]a(r)s')
             ->path('/^dir/');
 
-        $expected = array('r+e.gex[c]a(r)s'.DIRECTORY_SEPARATOR.'dir', 'r+e.gex[c]a(r)s'.DIRECTORY_SEPARATOR.'dir'.DIRECTORY_SEPARATOR.'bar.dat');
+        $expected = array('r+e.gex[c]a(r)s'.\DIRECTORY_SEPARATOR.'dir', 'r+e.gex[c]a(r)s'.\DIRECTORY_SEPARATOR.'dir'.\DIRECTORY_SEPARATOR.'bar.dat');
         $this->assertIterator($this->toAbsoluteFixtures($expected), $finder);
     }
 
@@ -612,7 +612,7 @@ public function getRegexNameTestData()
     public function testPath($matchPatterns, $noMatchPatterns, array $expected)
     {
         $finder = $this->buildFinder();
-        $finder->in(__DIR__.DIRECTORY_SEPARATOR.'Fixtures')
+        $finder->in(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures')
             ->path($matchPatterns)
             ->notPath($noMatchPatterns);
 
@@ -624,41 +624,41 @@ public function getTestPathData()
         return array(
             array('', '', array()),
             array('/^A\/B\/C/', '/C$/',
-                array('A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C'.DIRECTORY_SEPARATOR.'abc.dat'),
+                array('A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C'.\DIRECTORY_SEPARATOR.'abc.dat'),
             ),
             array('/^A\/B/', 'foobar',
                 array(
-                    'A'.DIRECTORY_SEPARATOR.'B',
-                    'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C',
-                    'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'ab.dat',
-                    'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C'.DIRECTORY_SEPARATOR.'abc.dat',
+                    'A'.\DIRECTORY_SEPARATOR.'B',
+                    'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C',
+                    'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'ab.dat',
+                    'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C'.\DIRECTORY_SEPARATOR.'abc.dat',
                 ),
             ),
             array('A/B/C', 'foobar',
                 array(
-                    'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C',
-                    'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C'.DIRECTORY_SEPARATOR.'abc.dat',
-                    'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C',
-                    'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C'.DIRECTORY_SEPARATOR.'abc.dat.copy',
+                    'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C',
+                    'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C'.\DIRECTORY_SEPARATOR.'abc.dat',
+                    'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C',
+                    'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C'.\DIRECTORY_SEPARATOR.'abc.dat.copy',
                 ),
             ),
             array('A/B', 'foobar',
                 array(
                     //dirs
-                    'A'.DIRECTORY_SEPARATOR.'B',
-                    'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C',
-                    'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'B',
-                    'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C',
+                    'A'.\DIRECTORY_SEPARATOR.'B',
+                    'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C',
+                    'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'B',
+                    'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C',
                     //files
-                    'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'ab.dat',
-                    'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C'.DIRECTORY_SEPARATOR.'abc.dat',
-                    'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'ab.dat.copy',
-                    'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C'.DIRECTORY_SEPARATOR.'abc.dat.copy',
+                    'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'ab.dat',
+                    'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C'.\DIRECTORY_SEPARATOR.'abc.dat',
+                    'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'ab.dat.copy',
+                    'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C'.\DIRECTORY_SEPARATOR.'abc.dat.copy',
                 ),
             ),
             array('/^with space\//', 'foobar',
                 array(
-                    'with space'.DIRECTORY_SEPARATOR.'foo.txt',
+                    'with space'.\DIRECTORY_SEPARATOR.'foo.txt',
                 ),
             ),
         );
@@ -666,7 +666,7 @@ public function getTestPathData()
 
     public function testAccessDeniedException()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('chmod is not supported on Windows');
         }
 
@@ -674,7 +674,7 @@ public function testAccessDeniedException()
         $finder->files()->in(self::$tmpDir);
 
         // make 'foo' directory non-readable
-        $testDir = self::$tmpDir.DIRECTORY_SEPARATOR.'foo';
+        $testDir = self::$tmpDir.\DIRECTORY_SEPARATOR.'foo';
         chmod($testDir, 0333);
 
         if (false === $couldRead = is_readable($testDir)) {
@@ -706,7 +706,7 @@ public function testAccessDeniedException()
 
     public function testIgnoredAccessDeniedException()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('chmod is not supported on Windows');
         }
 
@@ -714,7 +714,7 @@ public function testIgnoredAccessDeniedException()
         $finder->files()->ignoreUnreadableDirs()->in(self::$tmpDir);
 
         // make 'foo' directory non-readable
-        $testDir = self::$tmpDir.DIRECTORY_SEPARATOR.'foo';
+        $testDir = self::$tmpDir.\DIRECTORY_SEPARATOR.'foo';
         chmod($testDir, 0333);
 
         if (false === ($couldRead = is_readable($testDir))) {
diff --git a/src/Symfony/Component/Finder/Tests/GlobTest.php b/src/Symfony/Component/Finder/Tests/GlobTest.php
index d48ac1fc5452..3a5aab312428 100644
--- a/src/Symfony/Component/Finder/Tests/GlobTest.php
+++ b/src/Symfony/Component/Finder/Tests/GlobTest.php
@@ -32,9 +32,9 @@ public function testGlobToRegexDoubleStarStrictDots()
         $regex = Glob::toRegex('/**/*.neon');
 
         foreach ($finder->in(__DIR__) as $k => $v) {
-            $k = str_replace(DIRECTORY_SEPARATOR, '/', $k);
-            if (preg_match($regex, substr($k, strlen(__DIR__)))) {
-                $match[] = substr($k, 10 + strlen(__DIR__));
+            $k = str_replace(\DIRECTORY_SEPARATOR, '/', $k);
+            if (preg_match($regex, substr($k, \strlen(__DIR__)))) {
+                $match[] = substr($k, 10 + \strlen(__DIR__));
             }
         }
         sort($match);
@@ -49,9 +49,9 @@ public function testGlobToRegexDoubleStarNonStrictDots()
         $regex = Glob::toRegex('/**/*.neon', false);
 
         foreach ($finder->in(__DIR__) as $k => $v) {
-            $k = str_replace(DIRECTORY_SEPARATOR, '/', $k);
-            if (preg_match($regex, substr($k, strlen(__DIR__)))) {
-                $match[] = substr($k, 10 + strlen(__DIR__));
+            $k = str_replace(\DIRECTORY_SEPARATOR, '/', $k);
+            if (preg_match($regex, substr($k, \strlen(__DIR__)))) {
+                $match[] = substr($k, 10 + \strlen(__DIR__));
             }
         }
         sort($match);
@@ -66,9 +66,9 @@ public function testGlobToRegexDoubleStarWithoutLeadingSlash()
         $regex = Glob::toRegex('/Fixtures/one/**');
 
         foreach ($finder->in(__DIR__) as $k => $v) {
-            $k = str_replace(DIRECTORY_SEPARATOR, '/', $k);
-            if (preg_match($regex, substr($k, strlen(__DIR__)))) {
-                $match[] = substr($k, 10 + strlen(__DIR__));
+            $k = str_replace(\DIRECTORY_SEPARATOR, '/', $k);
+            if (preg_match($regex, substr($k, \strlen(__DIR__)))) {
+                $match[] = substr($k, 10 + \strlen(__DIR__));
             }
         }
         sort($match);
@@ -83,9 +83,9 @@ public function testGlobToRegexDoubleStarWithoutLeadingSlashNotStrictLeadingDot(
         $regex = Glob::toRegex('/Fixtures/one/**', false);
 
         foreach ($finder->in(__DIR__) as $k => $v) {
-            $k = str_replace(DIRECTORY_SEPARATOR, '/', $k);
-            if (preg_match($regex, substr($k, strlen(__DIR__)))) {
-                $match[] = substr($k, 10 + strlen(__DIR__));
+            $k = str_replace(\DIRECTORY_SEPARATOR, '/', $k);
+            if (preg_match($regex, substr($k, \strlen(__DIR__)))) {
+                $match[] = substr($k, 10 + \strlen(__DIR__));
             }
         }
         sort($match);
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/DateRangeFilterIteratorTest.php b/src/Symfony/Component/Finder/Tests/Iterator/DateRangeFilterIteratorTest.php
index 1ec70518278a..3226f706c7e1 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/DateRangeFilterIteratorTest.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/DateRangeFilterIteratorTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Finder\Tests\Iterator;
 
-use Symfony\Component\Finder\Iterator\DateRangeFilterIterator;
 use Symfony\Component\Finder\Comparator\DateComparator;
+use Symfony\Component\Finder\Iterator\DateRangeFilterIterator;
 
 class DateRangeFilterIteratorTest extends RealIteratorTestCase
 {
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/IteratorTestCase.php b/src/Symfony/Component/Finder/Tests/Iterator/IteratorTestCase.php
index c724a75c692d..89f042aefadd 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/IteratorTestCase.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/IteratorTestCase.php
@@ -19,9 +19,9 @@ protected function assertIterator($expected, \Traversable $iterator)
     {
         // set iterator_to_array $use_key to false to avoid values merge
         // this made FinderTest::testAppendWithAnArray() fail with GnuFinderAdapter
-        $values = array_map(function (\SplFileInfo $fileinfo) { return str_replace('/', DIRECTORY_SEPARATOR, $fileinfo->getPathname()); }, iterator_to_array($iterator, false));
+        $values = array_map(function (\SplFileInfo $fileinfo) { return str_replace('/', \DIRECTORY_SEPARATOR, $fileinfo->getPathname()); }, iterator_to_array($iterator, false));
 
-        $expected = array_map(function ($path) { return str_replace('/', DIRECTORY_SEPARATOR, $path); }, $expected);
+        $expected = array_map(function ($path) { return str_replace('/', \DIRECTORY_SEPARATOR, $path); }, $expected);
 
         sort($values);
         sort($expected);
@@ -52,7 +52,7 @@ protected function assertOrderedIteratorForGroups($expected, \Traversable $itera
 
         foreach ($expected as $subarray) {
             $temp = array();
-            while (count($values) && count($temp) < count($subarray)) {
+            while (\count($values) && \count($temp) < \count($subarray)) {
                 $temp[] = array_shift($values);
             }
             sort($temp);
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php b/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
index cfe31c90f741..36e6528d019b 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
@@ -25,9 +25,9 @@ class MockSplFileInfo extends \SplFileInfo
 
     public function __construct($param)
     {
-        if (is_string($param)) {
+        if (\is_string($param)) {
             parent::__construct($param);
-        } elseif (is_array($param)) {
+        } elseif (\is_array($param)) {
             $defaults = array(
               'name' => 'file.txt',
               'contents' => null,
@@ -92,7 +92,7 @@ public function setMode($mode)
 
     public function setType($type)
     {
-        if (is_string($type)) {
+        if (\is_string($type)) {
             switch ($type) {
                 case 'directory':
                 case 'd':
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/PathFilterIteratorTest.php b/src/Symfony/Component/Finder/Tests/Iterator/PathFilterIteratorTest.php
index 6e10550c06e4..38ed966a6103 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/PathFilterIteratorTest.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/PathFilterIteratorTest.php
@@ -31,37 +31,37 @@ public function getTestFilterData()
         //PATH:   A/B/C/abc.dat
         $inner[] = new MockSplFileInfo(array(
             'name' => 'abc.dat',
-            'relativePathname' => 'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C'.DIRECTORY_SEPARATOR.'abc.dat',
+            'relativePathname' => 'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C'.\DIRECTORY_SEPARATOR.'abc.dat',
         ));
 
         //PATH:   A/B/ab.dat
         $inner[] = new MockSplFileInfo(array(
             'name' => 'ab.dat',
-            'relativePathname' => 'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'ab.dat',
+            'relativePathname' => 'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'ab.dat',
         ));
 
         //PATH:   A/a.dat
         $inner[] = new MockSplFileInfo(array(
             'name' => 'a.dat',
-            'relativePathname' => 'A'.DIRECTORY_SEPARATOR.'a.dat',
+            'relativePathname' => 'A'.\DIRECTORY_SEPARATOR.'a.dat',
         ));
 
         //PATH:   copy/A/B/C/abc.dat.copy
         $inner[] = new MockSplFileInfo(array(
             'name' => 'abc.dat.copy',
-            'relativePathname' => 'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'C'.DIRECTORY_SEPARATOR.'abc.dat',
+            'relativePathname' => 'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'C'.\DIRECTORY_SEPARATOR.'abc.dat',
         ));
 
         //PATH:   copy/A/B/ab.dat.copy
         $inner[] = new MockSplFileInfo(array(
             'name' => 'ab.dat.copy',
-            'relativePathname' => 'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'B'.DIRECTORY_SEPARATOR.'ab.dat',
+            'relativePathname' => 'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'B'.\DIRECTORY_SEPARATOR.'ab.dat',
         ));
 
         //PATH:   copy/A/a.dat.copy
         $inner[] = new MockSplFileInfo(array(
             'name' => 'a.dat.copy',
-            'relativePathname' => 'copy'.DIRECTORY_SEPARATOR.'A'.DIRECTORY_SEPARATOR.'a.dat',
+            'relativePathname' => 'copy'.\DIRECTORY_SEPARATOR.'A'.\DIRECTORY_SEPARATOR.'a.dat',
         ));
 
         return array(
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/RealIteratorTestCase.php b/src/Symfony/Component/Finder/Tests/Iterator/RealIteratorTestCase.php
index 4f274e2d12ef..b0223b782b6a 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/RealIteratorTestCase.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/RealIteratorTestCase.php
@@ -18,7 +18,7 @@ abstract class RealIteratorTestCase extends IteratorTestCase
 
     public static function setUpBeforeClass()
     {
-        self::$tmpDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'symfony_finder';
+        self::$tmpDir = realpath(sys_get_temp_dir()).\DIRECTORY_SEPARATOR.'symfony_finder';
 
         self::$files = array(
             '.git/',
@@ -44,7 +44,7 @@ public static function setUpBeforeClass()
         }
 
         foreach (self::$files as $file) {
-            if (DIRECTORY_SEPARATOR === $file[strlen($file) - 1]) {
+            if (\DIRECTORY_SEPARATOR === $file[\strlen($file) - 1]) {
                 mkdir($file);
             } else {
                 touch($file);
@@ -84,24 +84,24 @@ protected static function toAbsolute($files = null)
          * Without the call to setUpBeforeClass() property can be null.
          */
         if (!self::$tmpDir) {
-            self::$tmpDir = realpath(sys_get_temp_dir()).DIRECTORY_SEPARATOR.'symfony_finder';
+            self::$tmpDir = realpath(sys_get_temp_dir()).\DIRECTORY_SEPARATOR.'symfony_finder';
         }
 
-        if (is_array($files)) {
+        if (\is_array($files)) {
             $f = array();
             foreach ($files as $file) {
-                if (is_array($file)) {
+                if (\is_array($file)) {
                     $f[] = self::toAbsolute($file);
                 } else {
-                    $f[] = self::$tmpDir.DIRECTORY_SEPARATOR.str_replace('/', DIRECTORY_SEPARATOR, $file);
+                    $f[] = self::$tmpDir.\DIRECTORY_SEPARATOR.str_replace('/', \DIRECTORY_SEPARATOR, $file);
                 }
             }
 
             return $f;
         }
 
-        if (is_string($files)) {
-            return self::$tmpDir.DIRECTORY_SEPARATOR.str_replace('/', DIRECTORY_SEPARATOR, $files);
+        if (\is_string($files)) {
+            return self::$tmpDir.\DIRECTORY_SEPARATOR.str_replace('/', \DIRECTORY_SEPARATOR, $files);
         }
 
         return self::$tmpDir;
@@ -111,7 +111,7 @@ protected static function toAbsoluteFixtures($files)
     {
         $f = array();
         foreach ($files as $file) {
-            $f[] = realpath(__DIR__.DIRECTORY_SEPARATOR.'..'.DIRECTORY_SEPARATOR.'Fixtures'.DIRECTORY_SEPARATOR.$file);
+            $f[] = realpath(__DIR__.\DIRECTORY_SEPARATOR.'..'.\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR.$file);
         }
 
         return $f;
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/RecursiveDirectoryIteratorTest.php b/src/Symfony/Component/Finder/Tests/Iterator/RecursiveDirectoryIteratorTest.php
index 3a3ddc4dd4cd..0c9aca24b936 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/RecursiveDirectoryIteratorTest.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/RecursiveDirectoryIteratorTest.php
@@ -43,8 +43,8 @@ public function testSeekOnFtp()
         }
 
         $contains = array(
-            'ftp://speedtest.tele2.net'.DIRECTORY_SEPARATOR.'1000GB.zip',
-            'ftp://speedtest.tele2.net'.DIRECTORY_SEPARATOR.'100GB.zip',
+            'ftp://speedtest.tele2.net'.\DIRECTORY_SEPARATOR.'1000GB.zip',
+            'ftp://speedtest.tele2.net'.\DIRECTORY_SEPARATOR.'100GB.zip',
         );
         $actual = array();
 
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/SizeRangeFilterIteratorTest.php b/src/Symfony/Component/Finder/Tests/Iterator/SizeRangeFilterIteratorTest.php
index 6d75b0f2f0b1..068fc7b0bbfb 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/SizeRangeFilterIteratorTest.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/SizeRangeFilterIteratorTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Finder\Tests\Iterator;
 
-use Symfony\Component\Finder\Iterator\SizeRangeFilterIterator;
 use Symfony\Component\Finder\Comparator\NumberComparator;
+use Symfony\Component\Finder\Iterator\SizeRangeFilterIterator;
 
 class SizeRangeFilterIteratorTest extends RealIteratorTestCase
 {
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/SortableIteratorTest.php b/src/Symfony/Component/Finder/Tests/Iterator/SortableIteratorTest.php
index 444654a28fb6..a35a12b5bee5 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/SortableIteratorTest.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/SortableIteratorTest.php
@@ -30,10 +30,10 @@ public function testConstructor()
      */
     public function testAccept($mode, $expected)
     {
-        if (!is_callable($mode)) {
+        if (!\is_callable($mode)) {
             switch ($mode) {
                 case SortableIterator::SORT_BY_ACCESSED_TIME:
-                    if ('\\' === DIRECTORY_SEPARATOR) {
+                    if ('\\' === \DIRECTORY_SEPARATOR) {
                         touch(self::toAbsolute('.git'));
                     } else {
                         file_get_contents(self::toAbsolute('.git'));
@@ -62,7 +62,7 @@ public function testAccept($mode, $expected)
             || SortableIterator::SORT_BY_CHANGED_TIME === $mode
             || SortableIterator::SORT_BY_MODIFIED_TIME === $mode
         ) {
-            if ('\\' === DIRECTORY_SEPARATOR && SortableIterator::SORT_BY_MODIFIED_TIME !== $mode) {
+            if ('\\' === \DIRECTORY_SEPARATOR && SortableIterator::SORT_BY_MODIFIED_TIME !== $mode) {
                 $this->markTestSkipped('Sorting by atime or ctime is not supported on Windows');
             }
             $this->assertOrderedIteratorForGroups($expected, $iterator);
diff --git a/src/Symfony/Component/Form/AbstractExtension.php b/src/Symfony/Component/Form/AbstractExtension.php
index 59710ca22652..61497aba6b62 100644
--- a/src/Symfony/Component/Form/AbstractExtension.php
+++ b/src/Symfony/Component/Form/AbstractExtension.php
@@ -98,7 +98,7 @@ public function hasTypeExtensions($name)
             $this->initTypeExtensions();
         }
 
-        return isset($this->typeExtensions[$name]) && count($this->typeExtensions[$name]) > 0;
+        return isset($this->typeExtensions[$name]) && \count($this->typeExtensions[$name]) > 0;
     }
 
     /**
@@ -156,7 +156,7 @@ private function initTypes()
                 throw new UnexpectedTypeException($type, 'Symfony\Component\Form\FormTypeInterface');
             }
 
-            $this->types[get_class($type)] = $type;
+            $this->types[\get_class($type)] = $type;
         }
     }
 
diff --git a/src/Symfony/Component/Form/AbstractRendererEngine.php b/src/Symfony/Component/Form/AbstractRendererEngine.php
index c6f14c4b9a5f..7a419dcaeac2 100644
--- a/src/Symfony/Component/Form/AbstractRendererEngine.php
+++ b/src/Symfony/Component/Form/AbstractRendererEngine.php
@@ -49,7 +49,7 @@ public function setTheme(FormView $view, $themes, $useDefaultThemes = true)
         $cacheKey = $view->vars[self::CACHE_KEY_VAR];
 
         // Do not cast, as casting turns objects into arrays of properties
-        $this->themes[$cacheKey] = is_array($themes) ? $themes : array($themes);
+        $this->themes[$cacheKey] = \is_array($themes) ? $themes : array($themes);
         $this->useDefaultThemes[$cacheKey] = (bool) $useDefaultThemes;
 
         // Unset instead of resetting to an empty array, in order to allow
diff --git a/src/Symfony/Component/Form/AbstractType.php b/src/Symfony/Component/Form/AbstractType.php
index e99f1073b135..3509db5d94a9 100644
--- a/src/Symfony/Component/Form/AbstractType.php
+++ b/src/Symfony/Component/Form/AbstractType.php
@@ -52,7 +52,7 @@ public function configureOptions(OptionsResolver $resolver)
      */
     public function getBlockPrefix()
     {
-        return StringUtil::fqcnToBlockPrefix(get_class($this));
+        return StringUtil::fqcnToBlockPrefix(\get_class($this));
     }
 
     /**
diff --git a/src/Symfony/Component/Form/ButtonBuilder.php b/src/Symfony/Component/Form/ButtonBuilder.php
index c49a49f8ada9..dee7d33d8af9 100644
--- a/src/Symfony/Component/Form/ButtonBuilder.php
+++ b/src/Symfony/Component/Form/ButtonBuilder.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form;
 
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\Form\Exception\InvalidArgumentException;
 use Symfony\Component\Form\Exception\BadMethodCallException;
+use Symfony\Component\Form\Exception\InvalidArgumentException;
 
 /**
  * A builder for {@link Button} instances.
diff --git a/src/Symfony/Component/Form/CallbackTransformer.php b/src/Symfony/Component/Form/CallbackTransformer.php
index 5a0574ac823a..8155e4dca8ed 100644
--- a/src/Symfony/Component/Form/CallbackTransformer.php
+++ b/src/Symfony/Component/Form/CallbackTransformer.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form;
 
-use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\Form\Exception\TransformationFailedException;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
 
 class CallbackTransformer implements DataTransformerInterface
 {
@@ -41,7 +41,7 @@ public function __construct(callable $transform, callable $reverseTransform)
      */
     public function transform($data)
     {
-        return call_user_func($this->transform, $data);
+        return \call_user_func($this->transform, $data);
     }
 
     /**
@@ -57,6 +57,6 @@ public function transform($data)
      */
     public function reverseTransform($data)
     {
-        return call_user_func($this->reverseTransform, $data);
+        return \call_user_func($this->reverseTransform, $data);
     }
 }
diff --git a/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php b/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
index 5ae457b2452a..db18f6811280 100644
--- a/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
+++ b/src/Symfony/Component/Form/ChoiceList/ArrayChoiceList.php
@@ -155,7 +155,7 @@ public function getValuesForChoices(array $choices)
             $givenValues = array();
 
             foreach ($choices as $i => $givenChoice) {
-                $givenValues[$i] = (string) call_user_func($this->valueCallback, $givenChoice);
+                $givenValues[$i] = (string) \call_user_func($this->valueCallback, $givenChoice);
             }
 
             return array_intersect($givenValues, array_keys($this->choices));
@@ -196,13 +196,13 @@ protected function flatten(array $choices, $value, &$choicesByValues, &$keysByVa
         }
 
         foreach ($choices as $key => $choice) {
-            if (is_array($choice)) {
+            if (\is_array($choice)) {
                 $this->flatten($choice, $value, $choicesByValues, $keysByValues, $structuredValues[$key]);
 
                 continue;
             }
 
-            $choiceValue = (string) call_user_func($value, $choice);
+            $choiceValue = (string) \call_user_func($value, $choice);
             $choicesByValues[$choiceValue] = $choice;
             $keysByValues[$choiceValue] = $key;
             $structuredValues[$key] = $choiceValue;
@@ -222,7 +222,7 @@ protected function flatten(array $choices, $value, &$choicesByValues, &$keysByVa
     private function castableToString(array $choices, array &$cache = array())
     {
         foreach ($choices as $choice) {
-            if (is_array($choice)) {
+            if (\is_array($choice)) {
                 if (!$this->castableToString($choice, $cache)) {
                     return false;
                 }
diff --git a/src/Symfony/Component/Form/ChoiceList/Factory/CachingFactoryDecorator.php b/src/Symfony/Component/Form/ChoiceList/Factory/CachingFactoryDecorator.php
index 1e571ed81c06..dba025bc6487 100644
--- a/src/Symfony/Component/Form/ChoiceList/Factory/CachingFactoryDecorator.php
+++ b/src/Symfony/Component/Form/ChoiceList/Factory/CachingFactoryDecorator.php
@@ -49,11 +49,11 @@ class CachingFactoryDecorator implements ChoiceListFactoryInterface
      */
     public static function generateHash($value, $namespace = '')
     {
-        if (is_object($value)) {
+        if (\is_object($value)) {
             $value = spl_object_hash($value);
-        } elseif (is_array($value)) {
+        } elseif (\is_array($value)) {
             array_walk_recursive($value, function (&$v) {
-                if (is_object($v)) {
+                if (\is_object($v)) {
                     $v = spl_object_hash($v);
                 }
             });
@@ -77,7 +77,7 @@ private static function flatten(array $array, &$output)
         }
 
         foreach ($array as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 self::flatten($value, $output);
                 continue;
             }
diff --git a/src/Symfony/Component/Form/ChoiceList/Factory/DefaultChoiceListFactory.php b/src/Symfony/Component/Form/ChoiceList/Factory/DefaultChoiceListFactory.php
index 8d28376fd1bd..5dfe8fcd4def 100644
--- a/src/Symfony/Component/Form/ChoiceList/Factory/DefaultChoiceListFactory.php
+++ b/src/Symfony/Component/Form/ChoiceList/Factory/DefaultChoiceListFactory.php
@@ -52,9 +52,9 @@ public function createView(ChoiceListInterface $list, $preferredChoices = null,
         $choices = $list->getChoices();
         $keys = $list->getOriginalKeys();
 
-        if (!is_callable($preferredChoices) && !empty($preferredChoices)) {
+        if (!\is_callable($preferredChoices) && !empty($preferredChoices)) {
             $preferredChoices = function ($choice) use ($preferredChoices) {
-                return in_array($choice, $preferredChoices, true);
+                return \in_array($choice, $preferredChoices, true);
             };
         }
 
@@ -66,7 +66,7 @@ public function createView(ChoiceListInterface $list, $preferredChoices = null,
         // If $groupBy is a callable, choices are added to the group with the
         // name returned by the callable. If the callable returns null, the
         // choice is not added to any group
-        if (is_callable($groupBy)) {
+        if (\is_callable($groupBy)) {
             foreach ($choices as $value => $choice) {
                 self::addChoiceViewGroupedBy(
                     $groupBy,
@@ -99,13 +99,13 @@ public function createView(ChoiceListInterface $list, $preferredChoices = null,
         // Remove any empty group view that may have been created by
         // addChoiceViewGroupedBy()
         foreach ($preferredViews as $key => $view) {
-            if ($view instanceof ChoiceGroupView && 0 === count($view->choices)) {
+            if ($view instanceof ChoiceGroupView && 0 === \count($view->choices)) {
                 unset($preferredViews[$key]);
             }
         }
 
         foreach ($otherViews as $key => $view) {
-            if ($view instanceof ChoiceGroupView && 0 === count($view->choices)) {
+            if ($view instanceof ChoiceGroupView && 0 === \count($view->choices)) {
                 unset($otherViews[$key]);
             }
         }
@@ -118,7 +118,7 @@ private static function addChoiceView($choice, $value, $label, $keys, &$index, $
         // $value may be an integer or a string, since it's stored in the array
         // keys. We want to guarantee it's a string though.
         $key = $keys[$value];
-        $nextIndex = is_int($index) ? $index++ : call_user_func($index, $choice, $key, $value);
+        $nextIndex = \is_int($index) ? $index++ : \call_user_func($index, $choice, $key, $value);
 
         // BC normalize label to accept a false value
         if (null === $label) {
@@ -127,7 +127,7 @@ private static function addChoiceView($choice, $value, $label, $keys, &$index, $
         } elseif (false !== $label) {
             // If "choice_label" is set to false and "expanded" is true, the value false
             // should be passed on to the "label" option of the checkboxes/radio buttons
-            $dynamicLabel = call_user_func($label, $choice, $key, $value);
+            $dynamicLabel = \call_user_func($label, $choice, $key, $value);
             $label = false === $dynamicLabel ? false : (string) $dynamicLabel;
         }
 
@@ -137,11 +137,11 @@ private static function addChoiceView($choice, $value, $label, $keys, &$index, $
             $label,
             // The attributes may be a callable or a mapping from choice indices
             // to nested arrays
-            is_callable($attr) ? call_user_func($attr, $choice, $key, $value) : (isset($attr[$key]) ? $attr[$key] : array())
+            \is_callable($attr) ? \call_user_func($attr, $choice, $key, $value) : (isset($attr[$key]) ? $attr[$key] : array())
         );
 
         // $isPreferred may be null if no choices are preferred
-        if ($isPreferred && call_user_func($isPreferred, $choice, $key, $value)) {
+        if ($isPreferred && \call_user_func($isPreferred, $choice, $key, $value)) {
             $preferredViews[$nextIndex] = $view;
         } else {
             $otherViews[$nextIndex] = $view;
@@ -156,7 +156,7 @@ private static function addChoiceViewsGroupedBy($groupBy, $label, $choices, $key
             }
 
             // Add the contents of groups to new ChoiceGroupView instances
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $preferredViewsForGroup = array();
                 $otherViewsForGroup = array();
 
@@ -172,11 +172,11 @@ private static function addChoiceViewsGroupedBy($groupBy, $label, $choices, $key
                     $otherViewsForGroup
                 );
 
-                if (count($preferredViewsForGroup) > 0) {
+                if (\count($preferredViewsForGroup) > 0) {
                     $preferredViews[$key] = new ChoiceGroupView($key, $preferredViewsForGroup);
                 }
 
-                if (count($otherViewsForGroup) > 0) {
+                if (\count($otherViewsForGroup) > 0) {
                     $otherViews[$key] = new ChoiceGroupView($key, $otherViewsForGroup);
                 }
 
@@ -200,7 +200,7 @@ private static function addChoiceViewsGroupedBy($groupBy, $label, $choices, $key
 
     private static function addChoiceViewGroupedBy($groupBy, $choice, $value, $label, $keys, &$index, $attr, $isPreferred, &$preferredViews, &$otherViews)
     {
-        $groupLabel = call_user_func($groupBy, $choice, $keys[$value], $value);
+        $groupLabel = \call_user_func($groupBy, $choice, $keys[$value], $value);
 
         if (null === $groupLabel) {
             // If the callable returns null, don't group the choice
diff --git a/src/Symfony/Component/Form/ChoiceList/Factory/PropertyAccessDecorator.php b/src/Symfony/Component/Form/ChoiceList/Factory/PropertyAccessDecorator.php
index 8584c911707c..8d8e10da1f8b 100644
--- a/src/Symfony/Component/Form/ChoiceList/Factory/PropertyAccessDecorator.php
+++ b/src/Symfony/Component/Form/ChoiceList/Factory/PropertyAccessDecorator.php
@@ -71,7 +71,7 @@ public function getDecoratedFactory()
      */
     public function createListFromChoices($choices, $value = null)
     {
-        if (is_string($value)) {
+        if (\is_string($value)) {
             $value = new PropertyPath($value);
         }
 
@@ -82,7 +82,7 @@ public function createListFromChoices($choices, $value = null)
                 // when such values are passed to
                 // ChoiceListInterface::getValuesForChoices(). Handle this case
                 // so that the call to getValue() doesn't break.
-                if (is_object($choice) || is_array($choice)) {
+                if (\is_object($choice) || \is_array($choice)) {
                     return $accessor->getValue($choice, $value);
                 }
             };
@@ -102,7 +102,7 @@ public function createListFromChoices($choices, $value = null)
      */
     public function createListFromLoader(ChoiceLoaderInterface $loader, $value = null)
     {
-        if (is_string($value)) {
+        if (\is_string($value)) {
             $value = new PropertyPath($value);
         }
 
@@ -113,7 +113,7 @@ public function createListFromLoader(ChoiceLoaderInterface $loader, $value = nul
                 // when such values are passed to
                 // ChoiceListInterface::getValuesForChoices(). Handle this case
                 // so that the call to getValue() doesn't break.
-                if (is_object($choice) || is_array($choice)) {
+                if (\is_object($choice) || \is_array($choice)) {
                     return $accessor->getValue($choice, $value);
                 }
             };
@@ -138,7 +138,7 @@ public function createView(ChoiceListInterface $list, $preferredChoices = null,
     {
         $accessor = $this->propertyAccessor;
 
-        if (is_string($label)) {
+        if (\is_string($label)) {
             $label = new PropertyPath($label);
         }
 
@@ -148,7 +148,7 @@ public function createView(ChoiceListInterface $list, $preferredChoices = null,
             };
         }
 
-        if (is_string($preferredChoices)) {
+        if (\is_string($preferredChoices)) {
             $preferredChoices = new PropertyPath($preferredChoices);
         }
 
@@ -163,7 +163,7 @@ public function createView(ChoiceListInterface $list, $preferredChoices = null,
             };
         }
 
-        if (is_string($index)) {
+        if (\is_string($index)) {
             $index = new PropertyPath($index);
         }
 
@@ -173,7 +173,7 @@ public function createView(ChoiceListInterface $list, $preferredChoices = null,
             };
         }
 
-        if (is_string($groupBy)) {
+        if (\is_string($groupBy)) {
             $groupBy = new PropertyPath($groupBy);
         }
 
@@ -187,7 +187,7 @@ public function createView(ChoiceListInterface $list, $preferredChoices = null,
             };
         }
 
-        if (is_string($attr)) {
+        if (\is_string($attr)) {
             $attr = new PropertyPath($attr);
         }
 
diff --git a/src/Symfony/Component/Form/ChoiceList/Loader/CallbackChoiceLoader.php b/src/Symfony/Component/Form/ChoiceList/Loader/CallbackChoiceLoader.php
index d2ca5e013c6e..b2825051afda 100644
--- a/src/Symfony/Component/Form/ChoiceList/Loader/CallbackChoiceLoader.php
+++ b/src/Symfony/Component/Form/ChoiceList/Loader/CallbackChoiceLoader.php
@@ -46,7 +46,7 @@ public function loadChoiceList($value = null)
             return $this->choiceList;
         }
 
-        return $this->choiceList = new ArrayChoiceList(call_user_func($this->callback), $value);
+        return $this->choiceList = new ArrayChoiceList(\call_user_func($this->callback), $value);
     }
 
     /**
diff --git a/src/Symfony/Component/Form/Command/DebugCommand.php b/src/Symfony/Component/Form/Command/DebugCommand.php
index 68f3bc96f100..7ad84d8701c0 100644
--- a/src/Symfony/Component/Form/Command/DebugCommand.php
+++ b/src/Symfony/Component/Form/Command/DebugCommand.php
@@ -111,10 +111,10 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 $object = $resolvedType->getOptionsResolver();
 
                 if (!$object->isDefined($option)) {
-                    $message = sprintf('Option "%s" is not defined in "%s".', $option, get_class($resolvedType->getInnerType()));
+                    $message = sprintf('Option "%s" is not defined in "%s".', $option, \get_class($resolvedType->getInnerType()));
 
                     if ($alternatives = $this->findAlternatives($option, $object->getDefinedOptions())) {
-                        if (1 == count($alternatives)) {
+                        if (1 == \count($alternatives)) {
                             $message .= "\n\nDid you mean this?\n    ";
                         } else {
                             $message .= "\n\nDid you mean one of these?\n    ";
@@ -147,12 +147,12 @@ private function getFqcnTypeClass(InputInterface $input, SymfonyStyle $io, $shor
             }
         }
 
-        if (0 === $count = count($classes)) {
+        if (0 === $count = \count($classes)) {
             $message = sprintf("Could not find type \"%s\" into the following namespaces:\n    %s", $shortClassName, implode("\n    ", $this->namespaces));
 
             $allTypes = array_merge($this->getCoreTypes(), $this->types);
             if ($alternatives = $this->findAlternatives($shortClassName, $allTypes)) {
-                if (1 == count($alternatives)) {
+                if (1 == \count($alternatives)) {
                     $message .= "\n\nDid you mean this?\n    ";
                 } else {
                     $message .= "\n\nDid you mean one of these?\n    ";
@@ -178,7 +178,7 @@ private function getCoreTypes()
         $loadTypesRefMethod = (new \ReflectionObject($coreExtension))->getMethod('loadTypes');
         $loadTypesRefMethod->setAccessible(true);
         $coreTypes = $loadTypesRefMethod->invoke($coreExtension);
-        $coreTypes = array_map(function (FormTypeInterface $type) { return get_class($type); }, $coreTypes);
+        $coreTypes = array_map(function (FormTypeInterface $type) { return \get_class($type); }, $coreTypes);
         sort($coreTypes);
 
         return $coreTypes;
@@ -189,7 +189,7 @@ private function findAlternatives($name, array $collection)
         $alternatives = array();
         foreach ($collection as $item) {
             $lev = levenshtein($name, $item);
-            if ($lev <= strlen($name) / 3 || false !== strpos($item, $name)) {
+            if ($lev <= \strlen($name) / 3 || false !== strpos($item, $name)) {
                 $alternatives[$item] = isset($alternatives[$item]) ? $alternatives[$item] - $lev : $lev;
             }
         }
diff --git a/src/Symfony/Component/Form/Console/Descriptor/Descriptor.php b/src/Symfony/Component/Form/Console/Descriptor/Descriptor.php
index fbdb19aff60f..bfa4302da221 100644
--- a/src/Symfony/Component/Form/Console/Descriptor/Descriptor.php
+++ b/src/Symfony/Component/Form/Console/Descriptor/Descriptor.php
@@ -58,7 +58,7 @@ public function describe(OutputInterface $output, $object, array $options = arra
                 $this->describeOption($object, $options);
                 break;
             default:
-                throw new \InvalidArgumentException(sprintf('Object of type "%s" is not describable.', get_class($object)));
+                throw new \InvalidArgumentException(sprintf('Object of type "%s" is not describable.', \get_class($object)));
         }
     }
 
@@ -133,7 +133,7 @@ protected function getOptionDefinition(OptionsResolver $optionsResolver, $option
 
     private function getParentOptionsResolver(ResolvedFormTypeInterface $type)
     {
-        $this->parents[$class = get_class($type->getInnerType())] = array();
+        $this->parents[$class = \get_class($type->getInnerType())] = array();
 
         if (null !== $type->getParent()) {
             $optionsResolver = clone $this->getParentOptionsResolver($type->getParent());
@@ -155,7 +155,7 @@ private function collectTypeExtensionsOptions(ResolvedFormTypeInterface $type, O
         foreach ($type->getTypeExtensions() as $extension) {
             $inheritedOptions = $optionsResolver->getDefinedOptions();
             $extension->configureOptions($optionsResolver);
-            $this->extensions[get_class($extension)] = array_diff($optionsResolver->getDefinedOptions(), $inheritedOptions);
+            $this->extensions[\get_class($extension)] = array_diff($optionsResolver->getDefinedOptions(), $inheritedOptions);
         }
     }
 }
diff --git a/src/Symfony/Component/Form/Console/Descriptor/JsonDescriptor.php b/src/Symfony/Component/Form/Console/Descriptor/JsonDescriptor.php
index 9d02aba3c12a..8e5a03e9ca93 100644
--- a/src/Symfony/Component/Form/Console/Descriptor/JsonDescriptor.php
+++ b/src/Symfony/Component/Form/Console/Descriptor/JsonDescriptor.php
@@ -45,7 +45,7 @@ protected function describeResolvedFormType(ResolvedFormTypeInterface $resolvedF
         $this->sortOptions($formOptions);
 
         $data = array(
-            'class' => get_class($resolvedFormType->getInnerType()),
+            'class' => \get_class($resolvedFormType->getInnerType()),
             'block_prefix' => $resolvedFormType->getInnerType()->getBlockPrefix(),
             'options' => $formOptions,
             'parent_types' => $this->parents,
@@ -90,7 +90,7 @@ private function sortOptions(array &$options)
         foreach ($options as &$opts) {
             $sorted = false;
             foreach ($opts as &$opt) {
-                if (is_array($opt)) {
+                if (\is_array($opt)) {
                     sort($opt);
                     $sorted = true;
                 }
diff --git a/src/Symfony/Component/Form/Console/Descriptor/TextDescriptor.php b/src/Symfony/Component/Form/Console/Descriptor/TextDescriptor.php
index d899ffce4e2a..ac8a8bb232ff 100644
--- a/src/Symfony/Component/Form/Console/Descriptor/TextDescriptor.php
+++ b/src/Symfony/Component/Form/Console/Descriptor/TextDescriptor.php
@@ -28,9 +28,9 @@ class TextDescriptor extends Descriptor
     protected function describeDefaults(array $options)
     {
         $this->output->section('Built-in form types (Symfony\Component\Form\Extension\Core\Type)');
-        $shortClassNames = array_map(function ($fqcn) { return array_slice(explode('\\', $fqcn), -1)[0]; }, $options['core_types']);
-        for ($i = 0; $i * 5 < count($shortClassNames); ++$i) {
-            $this->output->writeln(' '.implode(', ', array_slice($shortClassNames, $i * 5, 5)));
+        $shortClassNames = array_map(function ($fqcn) { return \array_slice(explode('\\', $fqcn), -1)[0]; }, $options['core_types']);
+        for ($i = 0; $i * 5 < \count($shortClassNames); ++$i) {
+            $this->output->writeln(' '.implode(', ', \array_slice($shortClassNames, $i * 5, 5)));
         }
 
         $this->output->section('Service form types');
@@ -63,14 +63,14 @@ protected function describeResolvedFormType(ResolvedFormTypeInterface $resolvedF
         ), $formOptions);
 
         $tableRows = array();
-        $count = count(max($formOptions));
+        $count = \count(max($formOptions));
         for ($i = 0; $i < $count; ++$i) {
             $cells = array();
             foreach (array_keys($tableHeaders) as $group) {
                 if (isset($formOptions[$group][$i])) {
                     $option = $formOptions[$group][$i];
 
-                    if (is_string($option) && in_array($option, $this->requiredOptions)) {
+                    if (\is_string($option) && \in_array($option, $this->requiredOptions)) {
                         $option .= ' <info>(required)</info>';
                     }
 
@@ -82,7 +82,7 @@ protected function describeResolvedFormType(ResolvedFormTypeInterface $resolvedF
             $tableRows[] = $cells;
         }
 
-        $this->output->title(sprintf('%s (Block prefix: "%s")', get_class($resolvedFormType->getInnerType()), $resolvedFormType->getInnerType()->getBlockPrefix()));
+        $this->output->title(sprintf('%s (Block prefix: "%s")', \get_class($resolvedFormType->getInnerType()), $resolvedFormType->getInnerType()->getBlockPrefix()));
         $this->output->table($tableHeaders, $tableRows);
 
         if ($this->parents) {
@@ -120,7 +120,7 @@ protected function describeOption(OptionsResolver $optionsResolver, array $optio
         }
         array_pop($rows);
 
-        $this->output->title(sprintf('%s (%s)', get_class($options['type']), $options['option']));
+        $this->output->title(sprintf('%s (%s)', \get_class($options['type']), $options['option']));
         $this->output->table(array(), $rows);
     }
 
@@ -129,11 +129,11 @@ private function normalizeAndSortOptionsColumns(array $options)
         foreach ($options as $group => $opts) {
             $sorted = false;
             foreach ($opts as $class => $opt) {
-                if (is_string($class)) {
+                if (\is_string($class)) {
                     unset($options[$group][$class]);
                 }
 
-                if (!is_array($opt) || 0 === count($opt)) {
+                if (!\is_array($opt) || 0 === \count($opt)) {
                     continue;
                 }
 
@@ -165,7 +165,7 @@ private function getDumpFunction()
             $prefix = Caster::PREFIX_VIRTUAL;
 
             return array(
-                $prefix.'parameters' => isset($a[$prefix.'parameters']) ? count($a[$prefix.'parameters']->value) : 0,
+                $prefix.'parameters' => isset($a[$prefix.'parameters']) ? \count($a[$prefix.'parameters']->value) : 0,
                 $prefix.'file' => $a[$prefix.'file'],
                 $prefix.'line' => $a[$prefix.'line'],
             );
diff --git a/src/Symfony/Component/Form/DependencyInjection/FormPass.php b/src/Symfony/Component/Form/DependencyInjection/FormPass.php
index 4926f549c22c..01a81469503b 100644
--- a/src/Symfony/Component/Form/DependencyInjection/FormPass.php
+++ b/src/Symfony/Component/Form/DependencyInjection/FormPass.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Form\DependencyInjection;
 
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\PriorityTaggedServiceTrait;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Reference;
 
diff --git a/src/Symfony/Component/Form/Exception/UnexpectedTypeException.php b/src/Symfony/Component/Form/Exception/UnexpectedTypeException.php
index 77a5c79d97f2..c9aa11eb47e7 100644
--- a/src/Symfony/Component/Form/Exception/UnexpectedTypeException.php
+++ b/src/Symfony/Component/Form/Exception/UnexpectedTypeException.php
@@ -15,6 +15,6 @@ class UnexpectedTypeException extends InvalidArgumentException
 {
     public function __construct($value, string $expectedType)
     {
-        parent::__construct(sprintf('Expected argument of type "%s", "%s" given', $expectedType, is_object($value) ? get_class($value) : gettype($value)));
+        parent::__construct(sprintf('Expected argument of type "%s", "%s" given', $expectedType, \is_object($value) ? \get_class($value) : \gettype($value)));
     }
 }
diff --git a/src/Symfony/Component/Form/Extension/Core/DataMapper/CheckboxListMapper.php b/src/Symfony/Component/Form/Extension/Core/DataMapper/CheckboxListMapper.php
index b85fb0025fe6..5e2101022278 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataMapper/CheckboxListMapper.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataMapper/CheckboxListMapper.php
@@ -34,13 +34,13 @@ public function mapDataToForms($choices, $checkboxes)
             $choices = array();
         }
 
-        if (!is_array($choices)) {
+        if (!\is_array($choices)) {
             throw new UnexpectedTypeException($choices, 'array');
         }
 
         foreach ($checkboxes as $checkbox) {
             $value = $checkbox->getConfig()->getOption('value');
-            $checkbox->setData(in_array($value, $choices, true));
+            $checkbox->setData(\in_array($value, $choices, true));
         }
     }
 
@@ -49,7 +49,7 @@ public function mapDataToForms($choices, $checkboxes)
      */
     public function mapFormsToData($checkboxes, &$choices)
     {
-        if (!is_array($choices)) {
+        if (!\is_array($choices)) {
             throw new UnexpectedTypeException($choices, 'array');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataMapper/PropertyPathMapper.php b/src/Symfony/Component/Form/Extension/Core/DataMapper/PropertyPathMapper.php
index 25aba9a16d43..f9721e52b176 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataMapper/PropertyPathMapper.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataMapper/PropertyPathMapper.php
@@ -37,7 +37,7 @@ public function mapDataToForms($data, $forms)
     {
         $empty = null === $data || array() === $data;
 
-        if (!$empty && !is_array($data) && !is_object($data)) {
+        if (!$empty && !\is_array($data) && !\is_object($data)) {
             throw new UnexpectedTypeException($data, 'object, array or empty');
         }
 
@@ -62,7 +62,7 @@ public function mapFormsToData($forms, &$data)
             return;
         }
 
-        if (!is_array($data) && !is_object($data)) {
+        if (!\is_array($data) && !\is_object($data)) {
             throw new UnexpectedTypeException($data, 'object, array or empty');
         }
 
@@ -81,7 +81,7 @@ public function mapFormsToData($forms, &$data)
 
                 // If the data is identical to the value in $data, we are
                 // dealing with a reference
-                if (!is_object($data) || !$config->getByReference() || $form->getData() !== $this->propertyAccessor->getValue($data, $propertyPath)) {
+                if (!\is_object($data) || !$config->getByReference() || $form->getData() !== $this->propertyAccessor->getValue($data, $propertyPath)) {
                     $this->propertyAccessor->setValue($data, $propertyPath, $form->getData());
                 }
             }
diff --git a/src/Symfony/Component/Form/Extension/Core/DataMapper/RadioListMapper.php b/src/Symfony/Component/Form/Extension/Core/DataMapper/RadioListMapper.php
index 6f757c601f9b..d2ec810f70c4 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataMapper/RadioListMapper.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataMapper/RadioListMapper.php
@@ -30,7 +30,7 @@ class RadioListMapper implements DataMapperInterface
      */
     public function mapDataToForms($choice, $radios)
     {
-        if (!is_string($choice)) {
+        if (!\is_string($choice)) {
             throw new UnexpectedTypeException($choice, 'string');
         }
 
@@ -45,7 +45,7 @@ public function mapDataToForms($choice, $radios)
      */
     public function mapFormsToData($radios, &$choice)
     {
-        if (null !== $choice && !is_string($choice)) {
+        if (null !== $choice && !\is_string($choice)) {
             throw new UnexpectedTypeException($choice, 'null or string');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/ArrayToPartsTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/ArrayToPartsTransformer.php
index 6929fb886705..53d4deddd379 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/ArrayToPartsTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/ArrayToPartsTransformer.php
@@ -32,7 +32,7 @@ public function transform($array)
             $array = array();
         }
 
-        if (!is_array($array)) {
+        if (!\is_array($array)) {
             throw new TransformationFailedException('Expected an array.');
         }
 
@@ -51,7 +51,7 @@ public function transform($array)
 
     public function reverseTransform($array)
     {
-        if (!is_array($array)) {
+        if (!\is_array($array)) {
             throw new TransformationFailedException('Expected an array.');
         }
 
@@ -70,8 +70,8 @@ public function reverseTransform($array)
             }
         }
 
-        if (count($emptyKeys) > 0) {
-            if (count($emptyKeys) === count($this->partMapping)) {
+        if (\count($emptyKeys) > 0) {
+            if (\count($emptyKeys) === \count($this->partMapping)) {
                 // All parts empty
                 return;
             }
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/BooleanToStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/BooleanToStringTransformer.php
index 21435ba5cbaf..0d9c4a05b295 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/BooleanToStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/BooleanToStringTransformer.php
@@ -47,7 +47,7 @@ public function transform($value)
             return;
         }
 
-        if (!is_bool($value)) {
+        if (!\is_bool($value)) {
             throw new TransformationFailedException('Expected a Boolean.');
         }
 
@@ -69,7 +69,7 @@ public function reverseTransform($value)
             return false;
         }
 
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             throw new TransformationFailedException('Expected a string.');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoiceToValueTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoiceToValueTransformer.php
index e8424b92994a..1154ad08a593 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoiceToValueTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoiceToValueTransformer.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form\Extension\Core\DataTransformer;
 
+use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
 use Symfony\Component\Form\DataTransformerInterface;
 use Symfony\Component\Form\Exception\TransformationFailedException;
-use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -34,13 +34,13 @@ public function transform($choice)
 
     public function reverseTransform($value)
     {
-        if (null !== $value && !is_string($value)) {
+        if (null !== $value && !\is_string($value)) {
             throw new TransformationFailedException('Expected a string or null.');
         }
 
         $choices = $this->choiceList->getChoicesForValues(array((string) $value));
 
-        if (1 !== count($choices)) {
+        if (1 !== \count($choices)) {
             if (null === $value || '' === $value) {
                 return;
             }
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoicesToValuesTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoicesToValuesTransformer.php
index a6b2f3fd58ce..835d51cddbb3 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoicesToValuesTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoicesToValuesTransformer.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form\Extension\Core\DataTransformer;
 
-use Symfony\Component\Form\Exception\TransformationFailedException;
-use Symfony\Component\Form\DataTransformerInterface;
 use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\TransformationFailedException;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -38,7 +38,7 @@ public function transform($array)
             return array();
         }
 
-        if (!is_array($array)) {
+        if (!\is_array($array)) {
             throw new TransformationFailedException('Expected an array.');
         }
 
@@ -58,13 +58,13 @@ public function reverseTransform($array)
             return array();
         }
 
-        if (!is_array($array)) {
+        if (!\is_array($array)) {
             throw new TransformationFailedException('Expected an array.');
         }
 
         $choices = $this->choiceList->getChoicesForValues($array);
 
-        if (count($choices) !== count($array)) {
+        if (\count($choices) !== \count($array)) {
             throw new TransformationFailedException('Could not find all matching choices for the given values');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DataTransformerChain.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DataTransformerChain.php
index 81ffc7e24762..72d1586d499d 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DataTransformerChain.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DataTransformerChain.php
@@ -73,7 +73,7 @@ public function transform($value)
      */
     public function reverseTransform($value)
     {
-        for ($i = count($this->transformers) - 1; $i >= 0; --$i) {
+        for ($i = \count($this->transformers) - 1; $i >= 0; --$i) {
             $value = $this->transformers[$i]->reverseTransform($value);
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateIntervalToArrayTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateIntervalToArrayTransformer.php
index 0950af445ab7..b7f3267b1299 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateIntervalToArrayTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateIntervalToArrayTransformer.php
@@ -88,7 +88,7 @@ public function transform($dateInterval)
         foreach (self::$availableFields as $field => $char) {
             $result[$field] = $dateInterval->format('%'.($this->pad ? strtoupper($char) : $char));
         }
-        if (in_array('weeks', $this->fields, true)) {
+        if (\in_array('weeks', $this->fields, true)) {
             $result['weeks'] = '0';
             if (isset($result['days']) && (int) $result['days'] >= 7) {
                 $result['weeks'] = (string) floor($result['days'] / 7);
@@ -116,7 +116,7 @@ public function reverseTransform($value)
         if (null === $value) {
             return;
         }
-        if (!is_array($value)) {
+        if (!\is_array($value)) {
             throw new UnexpectedTypeException($value, 'array');
         }
         if ('' === implode('', $value)) {
@@ -128,10 +128,10 @@ public function reverseTransform($value)
                 $emptyFields[] = $field;
             }
         }
-        if (count($emptyFields) > 0) {
+        if (\count($emptyFields) > 0) {
             throw new TransformationFailedException(sprintf('The fields "%s" should not be empty', implode('", "', $emptyFields)));
         }
-        if (isset($value['invert']) && !is_bool($value['invert'])) {
+        if (isset($value['invert']) && !\is_bool($value['invert'])) {
             throw new TransformationFailedException('The value of "invert" must be boolean');
         }
         foreach (self::$availableFields as $field => $char) {
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateIntervalToStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateIntervalToStringTransformer.php
index 4aeede823258..1e80dd68f721 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateIntervalToStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateIntervalToStringTransformer.php
@@ -72,7 +72,7 @@ public function reverseTransform($value)
         if (null === $value) {
             return;
         }
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             throw new UnexpectedTypeException($value, 'string');
         }
         if ('' === $value) {
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToArrayTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToArrayTransformer.php
index 8edc501fca27..60c39b6f8f65 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToArrayTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToArrayTransformer.php
@@ -114,7 +114,7 @@ public function reverseTransform($value)
             return;
         }
 
-        if (!is_array($value)) {
+        if (!\is_array($value)) {
             throw new TransformationFailedException('Expected an array.');
         }
 
@@ -130,7 +130,7 @@ public function reverseTransform($value)
             }
         }
 
-        if (count($emptyFields) > 0) {
+        if (\count($emptyFields) > 0) {
             throw new TransformationFailedException(
                 sprintf('The fields "%s" should not be empty', implode('", "', $emptyFields)
             ));
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
index 16b141985ea9..b97773353c6f 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
@@ -51,11 +51,11 @@ public function __construct(string $inputTimezone = null, string $outputTimezone
             $timeFormat = \IntlDateFormatter::SHORT;
         }
 
-        if (!in_array($dateFormat, self::$formats, true)) {
+        if (!\in_array($dateFormat, self::$formats, true)) {
             throw new UnexpectedTypeException($dateFormat, implode('", "', self::$formats));
         }
 
-        if (!in_array($timeFormat, self::$formats, true)) {
+        if (!\in_array($timeFormat, self::$formats, true)) {
             throw new UnexpectedTypeException($timeFormat, implode('", "', self::$formats));
         }
 
@@ -106,7 +106,7 @@ public function transform($dateTime)
      */
     public function reverseTransform($value)
     {
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             throw new TransformationFailedException('Expected a string.');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToRfc3339Transformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToRfc3339Transformer.php
index 550ea9b50f67..4f3a94436120 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToRfc3339Transformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToRfc3339Transformer.php
@@ -60,7 +60,7 @@ public function transform($dateTime)
      */
     public function reverseTransform($rfc3339)
     {
-        if (!is_string($rfc3339)) {
+        if (!\is_string($rfc3339)) {
             throw new TransformationFailedException('Expected a string.');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToStringTransformer.php
index c93d2c995d96..16e776b9ea8e 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToStringTransformer.php
@@ -112,7 +112,7 @@ public function reverseTransform($value)
             return;
         }
 
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             throw new TransformationFailedException('Expected a string.');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeZoneToStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeZoneToStringTransformer.php
index 978a64690798..1547499ed530 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeZoneToStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeZoneToStringTransformer.php
@@ -38,7 +38,7 @@ public function transform($dateTimeZone)
         }
 
         if ($this->multiple) {
-            if (!is_array($dateTimeZone)) {
+            if (!\is_array($dateTimeZone)) {
                 throw new TransformationFailedException('Expected an array.');
             }
 
@@ -62,14 +62,14 @@ public function reverseTransform($value)
         }
 
         if ($this->multiple) {
-            if (!is_array($value)) {
+            if (!\is_array($value)) {
                 throw new TransformationFailedException('Expected an array.');
             }
 
             return array_map(array(new self(), 'reverseTransform'), $value);
         }
 
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             throw new TransformationFailedException('Expected a string.');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
index d513caffc779..84df5ba7b60e 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
@@ -138,7 +138,7 @@ public function transform($value)
      */
     public function reverseTransform($value)
     {
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             throw new TransformationFailedException('Expected a string.');
         }
 
@@ -181,7 +181,7 @@ public function reverseTransform($value)
             throw new TransformationFailedException('I don\'t have a clear idea what infinity looks like');
         }
 
-        if (is_int($result) && $result === (int) $float = (float) $result) {
+        if (\is_int($result) && $result === (int) $float = (float) $result) {
             $result = $float;
         }
 
@@ -189,7 +189,7 @@ public function reverseTransform($value)
             $length = mb_strlen($value, $encoding);
             $remainder = mb_substr($value, $position, $length, $encoding);
         } else {
-            $length = strlen($value);
+            $length = \strlen($value);
             $remainder = substr($value, $position, $length);
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php
index 0ac32d5e2f09..74439a042c63 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/PercentToLocalizedStringTransformer.php
@@ -52,7 +52,7 @@ public function __construct(int $scale = null, string $type = null)
             $type = self::FRACTIONAL;
         }
 
-        if (!in_array($type, self::$types, true)) {
+        if (!\in_array($type, self::$types, true)) {
             throw new UnexpectedTypeException($type, implode('", "', self::$types));
         }
 
@@ -107,7 +107,7 @@ public function transform($value)
      */
     public function reverseTransform($value)
     {
-        if (!is_string($value)) {
+        if (!\is_string($value)) {
             throw new TransformationFailedException('Expected a string.');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/ValueToDuplicatesTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/ValueToDuplicatesTransformer.php
index 5b851af7dd88..c9adb0ad5a6f 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/ValueToDuplicatesTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/ValueToDuplicatesTransformer.php
@@ -54,7 +54,7 @@ public function transform($value)
      */
     public function reverseTransform($array)
     {
-        if (!is_array($array)) {
+        if (!\is_array($array)) {
             throw new TransformationFailedException('Expected an array.');
         }
 
@@ -73,8 +73,8 @@ public function reverseTransform($array)
             }
         }
 
-        if (count($emptyKeys) > 0) {
-            if (count($emptyKeys) == count($this->keys)) {
+        if (\count($emptyKeys) > 0) {
+            if (\count($emptyKeys) == \count($this->keys)) {
                 // All keys empty
                 return;
             }
diff --git a/src/Symfony/Component/Form/Extension/Core/EventListener/FixUrlProtocolListener.php b/src/Symfony/Component/Form/Extension/Core/EventListener/FixUrlProtocolListener.php
index 04ca6647ec8c..2219b819da86 100644
--- a/src/Symfony/Component/Form/Extension/Core/EventListener/FixUrlProtocolListener.php
+++ b/src/Symfony/Component/Form/Extension/Core/EventListener/FixUrlProtocolListener.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form\Extension\Core\EventListener;
 
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 
 /**
  * Adds a protocol to a URL if it doesn't already have one.
@@ -36,7 +36,7 @@ public function onSubmit(FormEvent $event)
     {
         $data = $event->getData();
 
-        if ($this->defaultProtocol && $data && is_string($data) && !preg_match('~^[\w+.-]+://~', $data)) {
+        if ($this->defaultProtocol && $data && \is_string($data) && !preg_match('~^[\w+.-]+://~', $data)) {
             $event->setData($this->defaultProtocol.'://'.$data);
         }
     }
diff --git a/src/Symfony/Component/Form/Extension/Core/EventListener/MergeCollectionListener.php b/src/Symfony/Component/Form/Extension/Core/EventListener/MergeCollectionListener.php
index 2a99581e7517..279c90c74a32 100644
--- a/src/Symfony/Component/Form/Extension/Core/EventListener/MergeCollectionListener.php
+++ b/src/Symfony/Component/Form/Extension/Core/EventListener/MergeCollectionListener.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Extension\Core\EventListener;
 
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -50,11 +50,11 @@ public function onSubmit(FormEvent $event)
             $data = array();
         }
 
-        if (!is_array($data) && !($data instanceof \Traversable && $data instanceof \ArrayAccess)) {
+        if (!\is_array($data) && !($data instanceof \Traversable && $data instanceof \ArrayAccess)) {
             throw new UnexpectedTypeException($data, 'array or (\Traversable and \ArrayAccess)');
         }
 
-        if (null !== $dataToMergeInto && !is_array($dataToMergeInto) && !($dataToMergeInto instanceof \Traversable && $dataToMergeInto instanceof \ArrayAccess)) {
+        if (null !== $dataToMergeInto && !\is_array($dataToMergeInto) && !($dataToMergeInto instanceof \Traversable && $dataToMergeInto instanceof \ArrayAccess)) {
             throw new UnexpectedTypeException($dataToMergeInto, 'array or (\Traversable and \ArrayAccess)');
         }
 
@@ -72,7 +72,7 @@ public function onSubmit(FormEvent $event)
             }
         } else {
             // Calculate delta
-            $itemsToAdd = is_object($data) ? clone $data : $data;
+            $itemsToAdd = \is_object($data) ? clone $data : $data;
             $itemsToDelete = array();
 
             foreach ($dataToMergeInto as $beforeKey => $beforeItem) {
diff --git a/src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php b/src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php
index d4b36b921e1b..c6983916d44a 100644
--- a/src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php
+++ b/src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Form\Extension\Core\EventListener;
 
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\FormEvent;
-use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\FormInterface;
 
 /**
@@ -66,7 +66,7 @@ public function preSetData(FormEvent $event)
             $data = array();
         }
 
-        if (!is_array($data) && !($data instanceof \Traversable && $data instanceof \ArrayAccess)) {
+        if (!\is_array($data) && !($data instanceof \Traversable && $data instanceof \ArrayAccess)) {
             throw new UnexpectedTypeException($data, 'array or (\Traversable and \ArrayAccess)');
         }
 
@@ -88,7 +88,7 @@ public function preSubmit(FormEvent $event)
         $form = $event->getForm();
         $data = $event->getData();
 
-        if (!is_array($data)) {
+        if (!\is_array($data)) {
             $data = array();
         }
 
@@ -126,7 +126,7 @@ public function onSubmit(FormEvent $event)
             $data = array();
         }
 
-        if (!is_array($data) && !($data instanceof \Traversable && $data instanceof \ArrayAccess)) {
+        if (!\is_array($data) && !($data instanceof \Traversable && $data instanceof \ArrayAccess)) {
             throw new UnexpectedTypeException($data, 'array or (\Traversable and \ArrayAccess)');
         }
 
@@ -135,7 +135,7 @@ public function onSubmit(FormEvent $event)
             /** @var FormInterface $child */
             foreach ($form as $name => $child) {
                 $isNew = !isset($previousData[$name]);
-                $isEmpty = is_callable($this->deleteEmpty) ? call_user_func($this->deleteEmpty, $child->getData()) : $child->isEmpty();
+                $isEmpty = \is_callable($this->deleteEmpty) ? \call_user_func($this->deleteEmpty, $child->getData()) : $child->isEmpty();
 
                 // $isNew can only be true if allowAdd is true, so we don't
                 // need to check allowAdd again
diff --git a/src/Symfony/Component/Form/Extension/Core/EventListener/TrimListener.php b/src/Symfony/Component/Form/Extension/Core/EventListener/TrimListener.php
index 96a1b2dcd6d2..59f1a242f8fa 100644
--- a/src/Symfony/Component/Form/Extension/Core/EventListener/TrimListener.php
+++ b/src/Symfony/Component/Form/Extension/Core/EventListener/TrimListener.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form\Extension\Core\EventListener;
 
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\Util\StringUtil;
 
 /**
@@ -27,7 +27,7 @@ public function preSubmit(FormEvent $event)
     {
         $data = $event->getData();
 
-        if (!is_string($data)) {
+        if (!\is_string($data)) {
             return;
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/CheckboxType.php b/src/Symfony/Component/Form/Extension/Core/Type/CheckboxType.php
index 90646e8712a2..1661caa07c49 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/CheckboxType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/CheckboxType.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\DataTransformer\BooleanToStringTransformer;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormInterface;
-use Symfony\Component\Form\Extension\Core\DataTransformer\BooleanToStringTransformer;
 use Symfony\Component\Form\FormView;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php b/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
index f4590b29a4bc..c81f562fcb4b 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
@@ -12,25 +12,25 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
 use Symfony\Component\Form\ChoiceList\Factory\CachingFactoryDecorator;
+use Symfony\Component\Form\ChoiceList\Factory\ChoiceListFactoryInterface;
+use Symfony\Component\Form\ChoiceList\Factory\DefaultChoiceListFactory;
 use Symfony\Component\Form\ChoiceList\Factory\PropertyAccessDecorator;
 use Symfony\Component\Form\ChoiceList\View\ChoiceGroupView;
-use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
-use Symfony\Component\Form\ChoiceList\Factory\DefaultChoiceListFactory;
-use Symfony\Component\Form\ChoiceList\Factory\ChoiceListFactoryInterface;
 use Symfony\Component\Form\ChoiceList\View\ChoiceListView;
 use Symfony\Component\Form\ChoiceList\View\ChoiceView;
 use Symfony\Component\Form\Exception\TransformationFailedException;
-use Symfony\Component\Form\Extension\Core\DataMapper\RadioListMapper;
 use Symfony\Component\Form\Extension\Core\DataMapper\CheckboxListMapper;
+use Symfony\Component\Form\Extension\Core\DataMapper\RadioListMapper;
+use Symfony\Component\Form\Extension\Core\DataTransformer\ChoicesToValuesTransformer;
+use Symfony\Component\Form\Extension\Core\DataTransformer\ChoiceToValueTransformer;
+use Symfony\Component\Form\Extension\Core\EventListener\MergeCollectionListener;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Extension\Core\EventListener\MergeCollectionListener;
-use Symfony\Component\Form\Extension\Core\DataTransformer\ChoiceToValueTransformer;
-use Symfony\Component\Form\Extension\Core\DataTransformer\ChoicesToValuesTransformer;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
@@ -70,7 +70,7 @@ public function buildForm(FormBuilderInterface $builder, array $options)
 
             // Check if the choices already contain the empty value
             // Only add the placeholder option if this is not the case
-            if (null !== $options['placeholder'] && 0 === count($choiceList->getChoicesForValues(array('')))) {
+            if (null !== $options['placeholder'] && 0 === \count($choiceList->getChoicesForValues(array('')))) {
                 $placeholderView = new ChoiceView(null, '', $options['placeholder']);
 
                 // "placeholder" is a reserved name
@@ -96,7 +96,7 @@ public function buildForm(FormBuilderInterface $builder, array $options)
 
                 // Convert the submitted data to a string, if scalar, before
                 // casting it to an array
-                if (!is_array($data)) {
+                if (!\is_array($data)) {
                     $data = (array) (string) $data;
                 }
 
@@ -127,7 +127,7 @@ public function buildForm(FormBuilderInterface $builder, array $options)
                 unset($unknownValues['']);
 
                 // Throw exception if unknown values were submitted
-                if (count($unknownValues) > 0) {
+                if (\count($unknownValues) > 0) {
                     throw new TransformationFailedException(sprintf(
                         'The choices "%s" do not exist in the choice list.',
                         implode('", "', array_keys($unknownValues))
@@ -157,12 +157,12 @@ public function buildForm(FormBuilderInterface $builder, array $options)
         $builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) {
             $data = $event->getData();
 
-            if (!is_array($data)) {
+            if (!\is_array($data)) {
                 return;
             }
 
             foreach ($data as $v) {
-                if (null !== $v && !is_string($v) && !is_int($v)) {
+                if (null !== $v && !\is_string($v) && !\is_int($v)) {
                     throw new TransformationFailedException('All choices submitted must be NULL, strings or ints.');
                 }
             }
@@ -203,7 +203,7 @@ public function buildView(FormView $view, FormInterface $form, array $options)
         // avoid making the type check inside the closure.
         if ($options['multiple']) {
             $view->vars['is_selected'] = function ($choice, array $values) {
-                return in_array($choice, $values, true);
+                return \in_array($choice, $values, true);
             };
         } else {
             $view->vars['is_selected'] = function ($choice, $value) {
@@ -351,7 +351,7 @@ private function addSubForms(FormBuilderInterface $builder, array $choiceViews,
     {
         foreach ($choiceViews as $name => $choiceView) {
             // Flatten groups
-            if (is_array($choiceView)) {
+            if (\is_array($choiceView)) {
                 $this->addSubForms($builder, $choiceView, $options);
                 continue;
             }
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php b/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
index e342efa52484..1cdc99019e6d 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\EventListener\ResizeFormListener;
 use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Form\FormView;
 use Symfony\Component\Form\FormInterface;
-use Symfony\Component\Form\Extension\Core\EventListener\ResizeFormListener;
+use Symfony\Component\Form\FormView;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/DateIntervalType.php b/src/Symfony/Component/Form/Extension/Core/Type/DateIntervalType.php
index 777c0ec121f6..7332b45b9154 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/DateIntervalType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/DateIntervalType.php
@@ -186,7 +186,7 @@ public function configureOptions(OptionsResolver $resolver)
         };
 
         $placeholderNormalizer = function (Options $options, $placeholder) use ($placeholderDefault, $timeParts) {
-            if (is_array($placeholder)) {
+            if (\is_array($placeholder)) {
                 $default = $placeholderDefault($options);
 
                 return array_merge(array_fill_keys($timeParts, $default), $placeholder);
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/DateTimeType.php b/src/Symfony/Component/Form/Extension/Core/Type/DateTimeType.php
index 23eeaf500964..081e0ed2c31e 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/DateTimeType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/DateTimeType.php
@@ -12,18 +12,18 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
-use Symfony\Component\Form\FormInterface;
-use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\ReversedTransformer;
+use Symfony\Component\Form\Extension\Core\DataTransformer\ArrayToPartsTransformer;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DataTransformerChain;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToArrayTransformer;
-use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToStringTransformer;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToLocalizedStringTransformer;
-use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToTimestampTransformer;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToRfc3339Transformer;
-use Symfony\Component\Form\Extension\Core\DataTransformer\ArrayToPartsTransformer;
+use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToStringTransformer;
+use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToTimestampTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\Form\ReversedTransformer;
+use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
@@ -77,12 +77,12 @@ public function buildForm(FormBuilderInterface $builder, array $options)
             $timeParts[] = 'second';
         }
 
-        $dateFormat = is_int($options['date_format']) ? $options['date_format'] : self::DEFAULT_DATE_FORMAT;
+        $dateFormat = \is_int($options['date_format']) ? $options['date_format'] : self::DEFAULT_DATE_FORMAT;
         $timeFormat = self::DEFAULT_TIME_FORMAT;
         $calendar = \IntlDateFormatter::GREGORIAN;
-        $pattern = is_string($options['format']) ? $options['format'] : null;
+        $pattern = \is_string($options['format']) ? $options['format'] : null;
 
-        if (!in_array($dateFormat, self::$acceptedFormats, true)) {
+        if (!\in_array($dateFormat, self::$acceptedFormats, true)) {
             throw new InvalidOptionsException('The "date_format" option must be one of the IntlDateFormatter constants (FULL, LONG, MEDIUM, SHORT) or a string representing a custom format.');
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/DateType.php b/src/Symfony/Component/Form/Extension/Core/Type/DateType.php
index bf51b15b6a4d..cd0dd15e215f 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/DateType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/DateType.php
@@ -12,17 +12,17 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormInterface;
-use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToLocalizedStringTransformer;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToArrayTransformer;
+use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToLocalizedStringTransformer;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToStringTransformer;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToTimestampTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
 use Symfony\Component\Form\ReversedTransformer;
+use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
-use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
 
 class DateType extends AbstractType
 {
@@ -46,12 +46,12 @@ class DateType extends AbstractType
      */
     public function buildForm(FormBuilderInterface $builder, array $options)
     {
-        $dateFormat = is_int($options['format']) ? $options['format'] : self::DEFAULT_FORMAT;
+        $dateFormat = \is_int($options['format']) ? $options['format'] : self::DEFAULT_FORMAT;
         $timeFormat = \IntlDateFormatter::NONE;
         $calendar = \IntlDateFormatter::GREGORIAN;
-        $pattern = is_string($options['format']) ? $options['format'] : null;
+        $pattern = \is_string($options['format']) ? $options['format'] : null;
 
-        if (!in_array($dateFormat, self::$acceptedFormats, true)) {
+        if (!\in_array($dateFormat, self::$acceptedFormats, true)) {
             throw new InvalidOptionsException('The "format" option must be one of the IntlDateFormatter constants (FULL, LONG, MEDIUM, SHORT) or a string representing a custom format.');
         }
 
@@ -157,7 +157,7 @@ public function finishView(FormView $view, FormInterface $form, array $options)
             $pattern = $form->getConfig()->getAttribute('formatter')->getPattern();
 
             // remove special characters unless the format was explicitly specified
-            if (!is_string($options['format'])) {
+            if (!\is_string($options['format'])) {
                 // remove quoted strings first
                 $pattern = preg_replace('/\'[^\']+\'/', '', $pattern);
 
@@ -192,7 +192,7 @@ public function configureOptions(OptionsResolver $resolver)
         };
 
         $placeholderNormalizer = function (Options $options, $placeholder) use ($placeholderDefault) {
-            if (is_array($placeholder)) {
+            if (\is_array($placeholder)) {
                 $default = $placeholderDefault($options);
 
                 return array_merge(
@@ -209,7 +209,7 @@ public function configureOptions(OptionsResolver $resolver)
         };
 
         $choiceTranslationDomainNormalizer = function (Options $options, $choiceTranslationDomain) {
-            if (is_array($choiceTranslationDomain)) {
+            if (\is_array($choiceTranslationDomain)) {
                 $default = false;
 
                 return array_replace(
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/FileType.php b/src/Symfony/Component/Form/Extension/Core/Type/FileType.php
index 36836378ae5b..1b699d51e84a 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/FileType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/FileType.php
@@ -36,7 +36,7 @@ public function buildForm(FormBuilderInterface $builder, array $options)
                 $data = array();
                 $files = $event->getData();
 
-                if (!is_array($files)) {
+                if (!\is_array($files)) {
                     $files = array();
                 }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/FormType.php b/src/Symfony/Component/Form/Extension/Core/Type/FormType.php
index 1beb6ab806f8..363fd4659027 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/FormType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/FormType.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Form\Extension\Core\Type;
 
+use Symfony\Component\Form\Exception\LogicException;
+use Symfony\Component\Form\Extension\Core\DataMapper\PropertyPathMapper;
+use Symfony\Component\Form\Extension\Core\EventListener\TrimListener;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Extension\Core\EventListener\TrimListener;
-use Symfony\Component\Form\Extension\Core\DataMapper\PropertyPathMapper;
-use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 use Symfony\Component\PropertyAccess\PropertyAccess;
@@ -122,7 +122,7 @@ public function configureOptions(OptionsResolver $resolver)
 
         // Derive "data_class" option from passed "data" object
         $dataClass = function (Options $options) {
-            return isset($options['data']) && is_object($options['data']) ? get_class($options['data']) : null;
+            return isset($options['data']) && \is_object($options['data']) ? \get_class($options['data']) : null;
         };
 
         // Derive "empty_data" closure from "data_class" option
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/IntegerType.php b/src/Symfony/Component/Form/Extension/Core/Type/IntegerType.php
index 5a3765f71cfc..4051cbf23d3a 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/IntegerType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/IntegerType.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\Extension\Core\DataTransformer\IntegerToLocalizedStringTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class IntegerType extends AbstractType
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/MoneyType.php b/src/Symfony/Component/Form/Extension/Core/Type/MoneyType.php
index 585c1b6c9345..4ca60105ce15 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/MoneyType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/MoneyType.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormInterface;
-use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\Extension\Core\DataTransformer\MoneyToLocalizedStringTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormView;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/NumberType.php b/src/Symfony/Component/Form/Extension/Core/Type/NumberType.php
index ae49053e5514..4ef1cac13ddd 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/NumberType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/NumberType.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\Extension\Core\DataTransformer\NumberToLocalizedStringTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class NumberType extends AbstractType
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/PercentType.php b/src/Symfony/Component/Form/Extension/Core/Type/PercentType.php
index 46d29e284ec0..ff4d7168f910 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/PercentType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/PercentType.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\Extension\Core\DataTransformer\PercentToLocalizedStringTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class PercentType extends AbstractType
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/RepeatedType.php b/src/Symfony/Component/Form/Extension/Core/Type/RepeatedType.php
index 941f61b3c825..1189190f0980 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/RepeatedType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/RepeatedType.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\Extension\Core\DataTransformer\ValueToDuplicatesTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class RepeatedType extends AbstractType
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/TextareaType.php b/src/Symfony/Component/Form/Extension/Core/Type/TextareaType.php
index ddfe994d6e40..e4127f932cfc 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/TextareaType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/TextareaType.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormView;
 use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
 
 class TextareaType extends AbstractType
 {
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php b/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
index d1c04f73d927..ad7a1dba6b28 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
@@ -12,16 +12,16 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormEvent;
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\FormInterface;
-use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Form\ReversedTransformer;
 use Symfony\Component\Form\Exception\InvalidConfigurationException;
+use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToArrayTransformer;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToStringTransformer;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToTimestampTransformer;
-use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToArrayTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
+use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormView;
+use Symfony\Component\Form\ReversedTransformer;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
@@ -189,7 +189,7 @@ public function configureOptions(OptionsResolver $resolver)
         };
 
         $placeholderNormalizer = function (Options $options, $placeholder) use ($placeholderDefault) {
-            if (is_array($placeholder)) {
+            if (\is_array($placeholder)) {
                 $default = $placeholderDefault($options);
 
                 return array_merge(
@@ -206,7 +206,7 @@ public function configureOptions(OptionsResolver $resolver)
         };
 
         $choiceTranslationDomainNormalizer = function (Options $options, $choiceTranslationDomain) {
-            if (is_array($choiceTranslationDomain)) {
+            if (\is_array($choiceTranslationDomain)) {
                 $default = false;
 
                 return array_replace(
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/TimezoneType.php b/src/Symfony/Component/Form/Extension/Core/Type/TimezoneType.php
index 3adf18e84fc9..fb548fd932dd 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/TimezoneType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/TimezoneType.php
@@ -79,10 +79,10 @@ private static function getTimezones(int $regions): array
         foreach (\DateTimeZone::listIdentifiers($regions) as $timezone) {
             $parts = explode('/', $timezone);
 
-            if (count($parts) > 2) {
+            if (\count($parts) > 2) {
                 $region = $parts[0];
                 $name = $parts[1].' - '.$parts[2];
-            } elseif (count($parts) > 1) {
+            } elseif (\count($parts) > 1) {
                 $region = $parts[0];
                 $name = $parts[1];
             } else {
@@ -93,6 +93,6 @@ private static function getTimezones(int $regions): array
             $timezones[$region][str_replace('_', ' ', $name)] = $timezone;
         }
 
-        return 1 === count($timezones) ? reset($timezones) : $timezones;
+        return 1 === \count($timezones) ? reset($timezones) : $timezones;
     }
 }
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/UrlType.php b/src/Symfony/Component/Form/Extension/Core/Type/UrlType.php
index 4994835ccf80..689a2a10051a 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/UrlType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/UrlType.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\Extension\Core\EventListener\FixUrlProtocolListener;
+use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class UrlType extends AbstractType
diff --git a/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php b/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php
index 9774304a152a..6827686afddc 100644
--- a/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php
+++ b/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Extension\Csrf\EventListener;
 
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\Util\ServerParams;
 use Symfony\Component\Security\Csrf\CsrfToken;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
@@ -69,7 +69,7 @@ public function preSubmit(FormEvent $event)
                 $form->addError(new FormError($errorMessage));
             }
 
-            if (is_array($data)) {
+            if (\is_array($data)) {
                 unset($data[$this->fieldName]);
                 $event->setData($data);
             }
diff --git a/src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php b/src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php
index 5a24d6574ace..70a880d3c81b 100644
--- a/src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php
+++ b/src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php
@@ -14,8 +14,8 @@
 use Symfony\Component\Form\AbstractTypeExtension;
 use Symfony\Component\Form\Extension\Csrf\EventListener\CsrfValidationListener;
 use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Form\FormView;
 use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
 use Symfony\Component\Form\Util\ServerParams;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
@@ -59,7 +59,7 @@ public function buildForm(FormBuilderInterface $builder, array $options)
             ->addEventSubscriber(new CsrfValidationListener(
                 $options['csrf_field_name'],
                 $options['csrf_token_manager'],
-                $options['csrf_token_id'] ?: ($builder->getName() ?: get_class($builder->getType()->getInnerType())),
+                $options['csrf_token_id'] ?: ($builder->getName() ?: \get_class($builder->getType()->getInnerType())),
                 $options['csrf_message'],
                 $this->translator,
                 $this->translationDomain,
@@ -79,7 +79,7 @@ public function finishView(FormView $view, FormInterface $form, array $options)
     {
         if ($options['csrf_protection'] && !$view->parent && $options['compound']) {
             $factory = $form->getConfig()->getFormFactory();
-            $tokenId = $options['csrf_token_id'] ?: ($form->getName() ?: get_class($form->getConfig()->getType()->getInnerType()));
+            $tokenId = $options['csrf_token_id'] ?: ($form->getName() ?: \get_class($form->getConfig()->getType()->getInnerType()));
             $data = (string) $options['csrf_token_manager']->getToken($tokenId);
 
             $csrfForm = $factory->createNamed($options['csrf_field_name'], 'Symfony\Component\Form\Extension\Core\Type\HiddenType', $data, array(
diff --git a/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php b/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
index a3b7765e1247..7ac4f8b69357 100644
--- a/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
+++ b/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
@@ -162,7 +162,7 @@ public function collectSubmittedData(FormInterface $form)
 
         // Count errors
         if (isset($this->dataByForm[$hash]['errors'])) {
-            $this->data['nb_errors'] += count($this->dataByForm[$hash]['errors']);
+            $this->data['nb_errors'] += \count($this->dataByForm[$hash]['errors']);
         }
 
         foreach ($form as $child) {
@@ -259,7 +259,7 @@ protected function getCasters()
             FormInterface::class => function (FormInterface $f, array $a) {
                 return array(
                     Caster::PREFIX_VIRTUAL.'name' => $f->getName(),
-                    Caster::PREFIX_VIRTUAL.'type_class' => new ClassStub(get_class($f->getConfig()->getType()->getInnerType())),
+                    Caster::PREFIX_VIRTUAL.'type_class' => new ClassStub(\get_class($f->getConfig()->getType()->getInnerType())),
                 );
             },
             FormView::class => array(StubCaster::class, 'cutInternals'),
diff --git a/src/Symfony/Component/Form/Extension/DataCollector/FormDataExtractor.php b/src/Symfony/Component/Form/Extension/DataCollector/FormDataExtractor.php
index 9e7a9b579ea3..cdb1baec8f54 100644
--- a/src/Symfony/Component/Form/Extension/DataCollector/FormDataExtractor.php
+++ b/src/Symfony/Component/Form/Extension/DataCollector/FormDataExtractor.php
@@ -30,7 +30,7 @@ public function extractConfiguration(FormInterface $form)
         $data = array(
             'id' => $this->buildId($form),
             'name' => $form->getName(),
-            'type_class' => get_class($form->getConfig()->getType()->getInnerType()),
+            'type_class' => \get_class($form->getConfig()->getType()->getInnerType()),
             'synchronized' => $form->isSynchronized(),
             'passed_options' => array(),
             'resolved_options' => array(),
@@ -96,7 +96,7 @@ public function extractSubmittedData(FormInterface $form)
         foreach ($form->getErrors() as $error) {
             $errorData = array(
                 'message' => $error->getMessage(),
-                'origin' => is_object($error->getOrigin())
+                'origin' => \is_object($error->getOrigin())
                     ? spl_object_hash($error->getOrigin())
                     : null,
                 'trace' => array(),
diff --git a/src/Symfony/Component/Form/Extension/DependencyInjection/DependencyInjectionExtension.php b/src/Symfony/Component/Form/Extension/DependencyInjection/DependencyInjectionExtension.php
index e261fa4f7b83..826fcdfba3bf 100644
--- a/src/Symfony/Component/Form/Extension/DependencyInjection/DependencyInjectionExtension.php
+++ b/src/Symfony/Component/Form/Extension/DependencyInjection/DependencyInjectionExtension.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Extension\DependencyInjection;
 
 use Psr\Container\ContainerInterface;
+use Symfony\Component\Form\Exception\InvalidArgumentException;
 use Symfony\Component\Form\FormExtensionInterface;
 use Symfony\Component\Form\FormTypeGuesserChain;
-use Symfony\Component\Form\Exception\InvalidArgumentException;
 
 class DependencyInjectionExtension implements FormExtensionInterface
 {
diff --git a/src/Symfony/Component/Form/Extension/HttpFoundation/HttpFoundationRequestHandler.php b/src/Symfony/Component/Form/Extension/HttpFoundation/HttpFoundationRequestHandler.php
index 571db0eb41df..0a1297d3ab21 100644
--- a/src/Symfony/Component/Form/Extension/HttpFoundation/HttpFoundationRequestHandler.php
+++ b/src/Symfony/Component/Form/Extension/HttpFoundation/HttpFoundationRequestHandler.php
@@ -73,7 +73,7 @@ public function handleRequest(FormInterface $form, $request = null)
                 $form->submit(null, false);
 
                 $form->addError(new FormError(
-                    call_user_func($form->getConfig()->getOption('upload_max_size_message')),
+                    \call_user_func($form->getConfig()->getOption('upload_max_size_message')),
                     null,
                     array('{{ max }}' => $this->serverParams->getNormalizedIniPostMaxSize())
                 ));
@@ -93,7 +93,7 @@ public function handleRequest(FormInterface $form, $request = null)
                 return;
             }
 
-            if (is_array($params) && is_array($files)) {
+            if (\is_array($params) && \is_array($files)) {
                 $data = array_replace_recursive($params, $files);
             } else {
                 $data = $params ?: $files;
@@ -101,7 +101,7 @@ public function handleRequest(FormInterface $form, $request = null)
         }
 
         // Don't auto-submit the form unless at least one field is present.
-        if ('' === $name && count(array_intersect_key($data, $form->all())) <= 0) {
+        if ('' === $name && \count(array_intersect_key($data, $form->all())) <= 0) {
             return;
         }
 
diff --git a/src/Symfony/Component/Form/Extension/HttpFoundation/Type/FormTypeHttpFoundationExtension.php b/src/Symfony/Component/Form/Extension/HttpFoundation/Type/FormTypeHttpFoundationExtension.php
index d0f257a83dc9..0216b41c1271 100644
--- a/src/Symfony/Component/Form/Extension/HttpFoundation/Type/FormTypeHttpFoundationExtension.php
+++ b/src/Symfony/Component/Form/Extension/HttpFoundation/Type/FormTypeHttpFoundationExtension.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Extension\HttpFoundation\Type;
 
 use Symfony\Component\Form\AbstractTypeExtension;
-use Symfony\Component\Form\RequestHandlerInterface;
-use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\Extension\HttpFoundation\HttpFoundationRequestHandler;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\RequestHandlerInterface;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
diff --git a/src/Symfony/Component/Form/Extension/Templating/TemplatingExtension.php b/src/Symfony/Component/Form/Extension/Templating/TemplatingExtension.php
index 6d47d73167c8..903f7c75b48e 100644
--- a/src/Symfony/Component/Form/Extension/Templating/TemplatingExtension.php
+++ b/src/Symfony/Component/Form/Extension/Templating/TemplatingExtension.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Form\Extension\Templating;
 
+use Symfony\Bundle\FrameworkBundle\Templating\Helper\FormHelper;
 use Symfony\Component\Form\AbstractExtension;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
 use Symfony\Component\Templating\PhpEngine;
-use Symfony\Bundle\FrameworkBundle\Templating\Helper\FormHelper;
 
 /**
  * Integrates the Templating component with the Form library.
diff --git a/src/Symfony/Component/Form/Extension/Templating/TemplatingRendererEngine.php b/src/Symfony/Component/Form/Extension/Templating/TemplatingRendererEngine.php
index 7d389828ea3b..b26c9ef1ddb3 100644
--- a/src/Symfony/Component/Form/Extension/Templating/TemplatingRendererEngine.php
+++ b/src/Symfony/Component/Form/Extension/Templating/TemplatingRendererEngine.php
@@ -60,7 +60,7 @@ protected function loadResourceForBlockName($cacheKey, FormView $view, $blockNam
 
         // Check each theme whether it contains the searched block
         if (isset($this->themes[$cacheKey])) {
-            for ($i = count($this->themes[$cacheKey]) - 1; $i >= 0; --$i) {
+            for ($i = \count($this->themes[$cacheKey]) - 1; $i >= 0; --$i) {
                 if ($this->loadResourceFromTheme($cacheKey, $blockName, $this->themes[$cacheKey][$i])) {
                     return true;
                 }
@@ -70,7 +70,7 @@ protected function loadResourceForBlockName($cacheKey, FormView $view, $blockNam
         // Check the default themes once we reach the root form without success
         if (!$view->parent) {
             if (!isset($this->useDefaultThemes[$cacheKey]) || $this->useDefaultThemes[$cacheKey]) {
-                for ($i = count($this->defaultThemes) - 1; $i >= 0; --$i) {
+                for ($i = \count($this->defaultThemes) - 1; $i >= 0; --$i) {
                     if ($this->loadResourceFromTheme($cacheKey, $blockName, $this->defaultThemes[$i])) {
                         return true;
                     }
diff --git a/src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php b/src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php
index 273db0dbd287..3168a8ee1b5f 100644
--- a/src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php
+++ b/src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php
@@ -47,8 +47,8 @@ public function validate($form, Constraint $constraint)
             $data = $form->getData();
 
             // Validate the data against its own constraints
-            if ($form->isRoot() && (is_object($data) || is_array($data))) {
-                if (is_array($groups) && count($groups) > 0 || $groups instanceof GroupSequence && count($groups->groups) > 0) {
+            if ($form->isRoot() && (\is_object($data) || \is_array($data))) {
+                if (\is_array($groups) && \count($groups) > 0 || $groups instanceof GroupSequence && \count($groups->groups) > 0) {
                     $validator->atPath('data')->validate($form->getData(), null, $groups);
                 }
             }
@@ -62,9 +62,9 @@ public function validate($form, Constraint $constraint)
                 // Otherwise validate a constraint only once for the first
                 // matching group
                 foreach ($groups as $group) {
-                    if (in_array($group, $constraint->groups)) {
+                    if (\in_array($group, $constraint->groups)) {
                         $validator->atPath('data')->validate($form->getData(), $constraint, $group);
-                        if (count($this->context->getViolations()) > 0) {
+                        if (\count($this->context->getViolations()) > 0) {
                             break;
                         }
                     }
@@ -81,7 +81,7 @@ public function validate($form, Constraint $constraint)
                     // Otherwise validate a constraint only once for the first
                     // matching group
                     foreach ($groups as $group) {
-                        if (in_array($group, $constraint->groups)) {
+                        if (\in_array($group, $constraint->groups)) {
                             $validator->atPath('data')->validate($form->getData(), $constraint, $group);
 
                             // Prevent duplicate validation
@@ -111,7 +111,7 @@ public function validate($form, Constraint $constraint)
             if ($childrenSynchronized) {
                 $clientDataAsString = is_scalar($form->getViewData())
                     ? (string) $form->getViewData()
-                    : gettype($form->getViewData());
+                    : \gettype($form->getViewData());
 
                 $this->context->setConstraint($constraint);
                 $this->context->buildViolation($config->getOption('invalid_message'))
@@ -124,7 +124,7 @@ public function validate($form, Constraint $constraint)
         }
 
         // Mark the form with an error if it contains extra fields
-        if (!$config->getOption('allow_extra_fields') && count($form->getExtraData()) > 0) {
+        if (!$config->getOption('allow_extra_fields') && \count($form->getExtraData()) > 0) {
             $this->context->setConstraint($constraint);
             $this->context->buildViolation($config->getOption('extra_fields_message'))
                 ->setParameter('{{ extra_fields }}', implode('", "', array_keys($form->getExtraData())))
@@ -179,8 +179,8 @@ private static function getValidationGroups(FormInterface $form)
      */
     private static function resolveValidationGroups($groups, FormInterface $form)
     {
-        if (!is_string($groups) && is_callable($groups)) {
-            $groups = call_user_func($groups, $form);
+        if (!\is_string($groups) && \is_callable($groups)) {
+            $groups = \call_user_func($groups, $form);
         }
 
         if ($groups instanceof GroupSequence) {
diff --git a/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php b/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
index bd116d2a71a7..7b95f147d7e3 100644
--- a/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
+++ b/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Form\Extension\Validator\EventListener;
 
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Form\Extension\Validator\Constraints\Form;
 use Symfony\Component\Form\Extension\Validator\ViolationMapper\ViolationMapperInterface;
-use Symfony\Component\Validator\Validator\ValidatorInterface;
-use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\FormEvent;
-use Symfony\Component\Form\Extension\Validator\Constraints\Form;
+use Symfony\Component\Form\FormEvents;
+use Symfony\Component\Validator\Validator\ValidatorInterface;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
diff --git a/src/Symfony/Component/Form/Extension/Validator/Type/BaseValidatorExtension.php b/src/Symfony/Component/Form/Extension/Validator/Type/BaseValidatorExtension.php
index 4f52003c0d09..431bf5ecfb6c 100644
--- a/src/Symfony/Component/Form/Extension/Validator/Type/BaseValidatorExtension.php
+++ b/src/Symfony/Component/Form/Extension/Validator/Type/BaseValidatorExtension.php
@@ -39,7 +39,7 @@ public function configureOptions(OptionsResolver $resolver)
                 return;
             }
 
-            if (is_callable($groups)) {
+            if (\is_callable($groups)) {
                 return $groups;
             }
 
diff --git a/src/Symfony/Component/Form/Extension/Validator/Type/FormTypeValidatorExtension.php b/src/Symfony/Component/Form/Extension/Validator/Type/FormTypeValidatorExtension.php
index 761f93158de5..b83c2030c0f0 100644
--- a/src/Symfony/Component/Form/Extension/Validator/Type/FormTypeValidatorExtension.php
+++ b/src/Symfony/Component/Form/Extension/Validator/Type/FormTypeValidatorExtension.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Form\Extension\Validator\Type;
 
-use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Form\Extension\Validator\ViolationMapper\ViolationMapper;
 use Symfony\Component\Form\Extension\Validator\EventListener\ValidationListener;
-use Symfony\Component\Validator\Validator\ValidatorInterface;
+use Symfony\Component\Form\Extension\Validator\ViolationMapper\ViolationMapper;
+use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
+use Symfony\Component\Validator\Validator\ValidatorInterface;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -49,7 +49,7 @@ public function configureOptions(OptionsResolver $resolver)
 
         // Constraint should always be converted to an array
         $constraintsNormalizer = function (Options $options, $constraints) {
-            return is_object($constraints) ? array($constraints) : (array) $constraints;
+            return \is_object($constraints) ? array($constraints) : (array) $constraints;
         };
 
         $resolver->setDefaults(array(
diff --git a/src/Symfony/Component/Form/Extension/Validator/Type/UploadValidatorExtension.php b/src/Symfony/Component/Form/Extension/Validator/Type/UploadValidatorExtension.php
index 25bc229fa3e2..fe97a93ed1ac 100644
--- a/src/Symfony/Component/Form/Extension/Validator/Type/UploadValidatorExtension.php
+++ b/src/Symfony/Component/Form/Extension/Validator/Type/UploadValidatorExtension.php
@@ -40,7 +40,7 @@ public function configureOptions(OptionsResolver $resolver)
         $translationDomain = $this->translationDomain;
         $resolver->setNormalizer('upload_max_size_message', function (Options $options, $message) use ($translator, $translationDomain) {
             return function () use ($translator, $translationDomain, $message) {
-                return $translator->trans(call_user_func($message), array(), $translationDomain);
+                return $translator->trans(\call_user_func($message), array(), $translationDomain);
             };
         });
     }
diff --git a/src/Symfony/Component/Form/Extension/Validator/ValidatorExtension.php b/src/Symfony/Component/Form/Extension/Validator/ValidatorExtension.php
index 60e43b3cdc37..8e90a54da46c 100644
--- a/src/Symfony/Component/Form/Extension/Validator/ValidatorExtension.php
+++ b/src/Symfony/Component/Form/Extension/Validator/ValidatorExtension.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form\Extension\Validator;
 
-use Symfony\Component\Form\Extension\Validator\Constraints\Form;
 use Symfony\Component\Form\AbstractExtension;
+use Symfony\Component\Form\Extension\Validator\Constraints\Form;
 use Symfony\Component\Validator\Constraints\Valid;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Validator\ValidatorInterface;
diff --git a/src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php b/src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php
index 207015b2ce8c..d784c13e6949 100644
--- a/src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php
+++ b/src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php
@@ -77,7 +77,7 @@ public function guessPattern($class, $property)
      */
     public function guessTypeForConstraint(Constraint $constraint)
     {
-        switch (get_class($constraint)) {
+        switch (\get_class($constraint)) {
             case 'Symfony\Component\Validator\Constraints\Type':
                 switch ($constraint->type) {
                     case 'array':
@@ -162,7 +162,7 @@ public function guessTypeForConstraint(Constraint $constraint)
      */
     public function guessRequiredForConstraint(Constraint $constraint)
     {
-        switch (get_class($constraint)) {
+        switch (\get_class($constraint)) {
             case 'Symfony\Component\Validator\Constraints\NotNull':
             case 'Symfony\Component\Validator\Constraints\NotBlank':
             case 'Symfony\Component\Validator\Constraints\IsTrue':
@@ -177,7 +177,7 @@ public function guessRequiredForConstraint(Constraint $constraint)
      */
     public function guessMaxLengthForConstraint(Constraint $constraint)
     {
-        switch (get_class($constraint)) {
+        switch (\get_class($constraint)) {
             case 'Symfony\Component\Validator\Constraints\Length':
                 if (is_numeric($constraint->max)) {
                     return new ValueGuess($constraint->max, Guess::HIGH_CONFIDENCE);
@@ -185,14 +185,14 @@ public function guessMaxLengthForConstraint(Constraint $constraint)
                 break;
 
             case 'Symfony\Component\Validator\Constraints\Type':
-                if (in_array($constraint->type, array('double', 'float', 'numeric', 'real'))) {
+                if (\in_array($constraint->type, array('double', 'float', 'numeric', 'real'))) {
                     return new ValueGuess(null, Guess::MEDIUM_CONFIDENCE);
                 }
                 break;
 
             case 'Symfony\Component\Validator\Constraints\Range':
                 if (is_numeric($constraint->max)) {
-                    return new ValueGuess(strlen((string) $constraint->max), Guess::LOW_CONFIDENCE);
+                    return new ValueGuess(\strlen((string) $constraint->max), Guess::LOW_CONFIDENCE);
                 }
                 break;
         }
@@ -205,7 +205,7 @@ public function guessMaxLengthForConstraint(Constraint $constraint)
      */
     public function guessPatternForConstraint(Constraint $constraint)
     {
-        switch (get_class($constraint)) {
+        switch (\get_class($constraint)) {
             case 'Symfony\Component\Validator\Constraints\Length':
                 if (is_numeric($constraint->min)) {
                     return new ValueGuess(sprintf('.{%s,}', (string) $constraint->min), Guess::LOW_CONFIDENCE);
@@ -222,12 +222,12 @@ public function guessPatternForConstraint(Constraint $constraint)
 
             case 'Symfony\Component\Validator\Constraints\Range':
                 if (is_numeric($constraint->min)) {
-                    return new ValueGuess(sprintf('.{%s,}', strlen((string) $constraint->min)), Guess::LOW_CONFIDENCE);
+                    return new ValueGuess(sprintf('.{%s,}', \strlen((string) $constraint->min)), Guess::LOW_CONFIDENCE);
                 }
                 break;
 
             case 'Symfony\Component\Validator\Constraints\Type':
-                if (in_array($constraint->type, array('double', 'float', 'numeric', 'real'))) {
+                if (\in_array($constraint->type, array('double', 'float', 'numeric', 'real'))) {
                     return new ValueGuess(null, Guess::MEDIUM_CONFIDENCE);
                 }
                 break;
diff --git a/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/MappingRule.php b/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/MappingRule.php
index 4f31227408ff..c4d08821f28f 100644
--- a/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/MappingRule.php
+++ b/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/MappingRule.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form\Extension\Validator\ViolationMapper;
 
-use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\Exception\ErrorMappingException;
+use Symfony\Component\Form\FormInterface;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -64,7 +64,7 @@ public function match($propertyPath)
      */
     public function isPrefix($propertyPath)
     {
-        $length = strlen($propertyPath);
+        $length = \strlen($propertyPath);
         $prefix = substr($this->propertyPath, 0, $length);
         $next = isset($this->propertyPath[$length]) ? $this->propertyPath[$length] : null;
 
diff --git a/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationMapper.php b/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationMapper.php
index 8a3602e701c3..b635646f6896 100644
--- a/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationMapper.php
+++ b/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationMapper.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Form\Extension\Validator\ViolationMapper;
 
+use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\Util\InheritDataAwareIterator;
-use Symfony\Component\PropertyAccess\PropertyPathIterator;
 use Symfony\Component\PropertyAccess\PropertyPathBuilder;
+use Symfony\Component\PropertyAccess\PropertyPathIterator;
 use Symfony\Component\PropertyAccess\PropertyPathIteratorInterface;
-use Symfony\Component\Form\FormError;
 use Symfony\Component\Validator\ConstraintViolation;
 
 /**
@@ -48,7 +48,7 @@ public function mapViolation(ConstraintViolation $violation, FormInterface $form
         $match = false;
 
         // Don't create a ViolationPath instance for empty property paths
-        if (strlen($violation->getPropertyPath()) > 0) {
+        if (\strlen($violation->getPropertyPath()) > 0) {
             $violationPath = new ViolationPath($violation->getPropertyPath());
             $relativePath = $this->reconstructPath($violationPath, $form);
         }
diff --git a/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationPath.php b/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationPath.php
index 72c4cacfec7f..acfa5eab9c0e 100644
--- a/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationPath.php
+++ b/src/Symfony/Component/Form/Extension/Validator/ViolationMapper/ViolationPath.php
@@ -56,7 +56,7 @@ public function __construct(string $violationPath)
         $elements = $path->getElements();
         $data = false;
 
-        for ($i = 0, $l = count($elements); $i < $l; ++$i) {
+        for ($i = 0, $l = \count($elements); $i < $l; ++$i) {
             if (!$data) {
                 // The element "data" has not yet been passed
                 if ('children' === $elements[$i] && $path->isProperty($i)) {
@@ -107,7 +107,7 @@ public function __construct(string $violationPath)
             }
         }
 
-        $this->length = count($this->elements);
+        $this->length = \count($this->elements);
 
         $this->buildString();
     }
diff --git a/src/Symfony/Component/Form/Form.php b/src/Symfony/Component/Form/Form.php
index 41170ea87aee..dae0d273d42b 100644
--- a/src/Symfony/Component/Form/Form.php
+++ b/src/Symfony/Component/Form/Form.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Form;
 
-use Symfony\Component\Form\Exception\RuntimeException;
-use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\Form\Exception\AlreadySubmittedException;
-use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Form\Exception\OutOfBoundsException;
+use Symfony\Component\Form\Exception\RuntimeException;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\Form\Util\FormUtil;
 use Symfony\Component\Form\Util\InheritDataAwareIterator;
 use Symfony\Component\Form\Util\OrderedHashMap;
@@ -322,7 +322,7 @@ public function setData($modelData)
             return $this;
         }
 
-        if (is_object($modelData) && !$this->config->getByReference()) {
+        if (\is_object($modelData) && !$this->config->getByReference()) {
             $modelData = clone $modelData;
         }
 
@@ -354,9 +354,9 @@ public function setData($modelData)
             $dataClass = $this->config->getDataClass();
 
             if (null !== $dataClass && !$viewData instanceof $dataClass) {
-                $actualType = is_object($viewData)
-                    ? 'an instance of class '.get_class($viewData)
-                    : 'a(n) '.gettype($viewData);
+                $actualType = \is_object($viewData)
+                    ? 'an instance of class '.\get_class($viewData)
+                    : 'a(n) '.\gettype($viewData);
 
                 throw new LogicException(
                     'The form\'s view data is expected to be an instance of class '.
@@ -376,7 +376,7 @@ public function setData($modelData)
 
         // It is not necessary to invoke this method if the form doesn't have children,
         // even if the form is compound.
-        if (count($this->children) > 0) {
+        if (\count($this->children) > 0) {
             // Update child forms from the data
             $iterator = new InheritDataAwareIterator($this->children);
             $iterator = new \RecursiveIteratorIterator($iterator);
@@ -561,7 +561,7 @@ public function submit($submittedData, $clearMissing = true)
                     $submittedData = array();
                 }
 
-                if (!is_array($submittedData)) {
+                if (!\is_array($submittedData)) {
                     throw new TransformationFailedException('Compound forms expect an array or NULL on submission.');
                 }
 
@@ -618,7 +618,7 @@ public function submit($submittedData, $clearMissing = true)
                 // Merge form data from children into existing view data
                 // It is not necessary to invoke this method if the form has no children,
                 // even if it is compound.
-                if (count($this->children) > 0) {
+                if (\count($this->children) > 0) {
                     // Use InheritDataAwareIterator to process children of
                     // descendants that inherit this form's data.
                     // These descendants will not be submitted normally (see the check
@@ -723,7 +723,7 @@ public function isEmpty()
 
         return FormUtil::isEmpty($this->modelData) ||
             // arrays, countables
-            ((is_array($this->modelData) || $this->modelData instanceof \Countable) && 0 === count($this->modelData)) ||
+            ((\is_array($this->modelData) || $this->modelData instanceof \Countable) && 0 === \count($this->modelData)) ||
             // traversables that are not countable
             ($this->modelData instanceof \Traversable && 0 === iterator_count($this->modelData));
     }
@@ -741,7 +741,7 @@ public function isValid()
             return true;
         }
 
-        return 0 === count($this->getErrors(true));
+        return 0 === \count($this->getErrors(true));
     }
 
     /**
@@ -778,7 +778,7 @@ public function getErrors($deep = false, $flatten = true)
 
                 $iterator = $child->getErrors(true, $flatten);
 
-                if (0 === count($iterator)) {
+                if (0 === \count($iterator)) {
                     continue;
                 }
 
@@ -840,11 +840,11 @@ public function add($child, $type = null, array $options = array())
         }
 
         if (!$child instanceof FormInterface) {
-            if (!is_string($child) && !is_int($child)) {
+            if (!\is_string($child) && !\is_int($child)) {
                 throw new UnexpectedTypeException($child, 'string, integer or Symfony\Component\Form\FormInterface');
             }
 
-            if (null !== $type && !is_string($type) && !$type instanceof FormTypeInterface) {
+            if (null !== $type && !\is_string($type) && !$type instanceof FormTypeInterface) {
                 throw new UnexpectedTypeException($type, 'string or Symfony\Component\Form\FormTypeInterface');
             }
 
@@ -992,7 +992,7 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->children);
+        return \count($this->children);
     }
 
     /**
@@ -1063,7 +1063,7 @@ private function normToModel($value)
         try {
             $transformers = $this->config->getModelTransformers();
 
-            for ($i = count($transformers) - 1; $i >= 0; --$i) {
+            for ($i = \count($transformers) - 1; $i >= 0; --$i) {
                 $value = $transformers[$i]->reverseTransform($value);
             }
         } catch (TransformationFailedException $exception) {
@@ -1130,7 +1130,7 @@ private function viewToNorm($value)
         }
 
         try {
-            for ($i = count($transformers) - 1; $i >= 0; --$i) {
+            for ($i = \count($transformers) - 1; $i >= 0; --$i) {
                 $value = $transformers[$i]->reverseTransform($value);
             }
         } catch (TransformationFailedException $exception) {
diff --git a/src/Symfony/Component/Form/FormBuilder.php b/src/Symfony/Component/Form/FormBuilder.php
index ce0bbaa9c21a..b9b01a6c7d3c 100644
--- a/src/Symfony/Component/Form/FormBuilder.php
+++ b/src/Symfony/Component/Form/FormBuilder.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Form;
 
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Form\Exception\BadMethodCallException;
 use Symfony\Component\Form\Exception\InvalidArgumentException;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 /**
  * A builder for creating {@link Form} instances.
@@ -62,11 +62,11 @@ public function add($child, $type = null, array $options = array())
             return $this;
         }
 
-        if (!is_string($child) && !is_int($child)) {
+        if (!\is_string($child) && !\is_int($child)) {
             throw new UnexpectedTypeException($child, 'string, integer or Symfony\Component\Form\FormBuilderInterface');
         }
 
-        if (null !== $type && !is_string($type) && !$type instanceof FormTypeInterface) {
+        if (null !== $type && !\is_string($type) && !$type instanceof FormTypeInterface) {
             throw new UnexpectedTypeException($type, 'string or Symfony\Component\Form\FormTypeInterface');
         }
 
@@ -177,7 +177,7 @@ public function count()
             throw new BadMethodCallException('FormBuilder methods cannot be accessed anymore once the builder is turned into a FormConfigInterface instance.');
         }
 
-        return count($this->children);
+        return \count($this->children);
     }
 
     /**
diff --git a/src/Symfony/Component/Form/FormConfigBuilder.php b/src/Symfony/Component/Form/FormConfigBuilder.php
index e3660e19adbc..da2dc87fa99d 100644
--- a/src/Symfony/Component/Form/FormConfigBuilder.php
+++ b/src/Symfony/Component/Form/FormConfigBuilder.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Component\Form;
 
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\EventDispatcher\ImmutableEventDispatcher;
 use Symfony\Component\Form\Exception\BadMethodCallException;
 use Symfony\Component\Form\Exception\InvalidArgumentException;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\PropertyAccess\PropertyPath;
 use Symfony\Component\PropertyAccess\PropertyPathInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\EventDispatcher\ImmutableEventDispatcher;
 
 /**
  * A basic form configuration.
@@ -790,7 +790,7 @@ public function setMethod($method)
 
         $upperCaseMethod = strtoupper($method);
 
-        if (!in_array($upperCaseMethod, self::$allowedMethods)) {
+        if (!\in_array($upperCaseMethod, self::$allowedMethods)) {
             throw new InvalidArgumentException(sprintf(
                 'The form method is "%s", but should be one of "%s".',
                 $method,
@@ -857,7 +857,7 @@ public function getFormConfig()
      */
     public static function validateName($name)
     {
-        if (null !== $name && !is_string($name) && !is_int($name)) {
+        if (null !== $name && !\is_string($name) && !\is_int($name)) {
             throw new UnexpectedTypeException($name, 'string, integer or null');
         }
 
diff --git a/src/Symfony/Component/Form/FormErrorIterator.php b/src/Symfony/Component/Form/FormErrorIterator.php
index 857fde678c36..ef6e2b78cd16 100644
--- a/src/Symfony/Component/Form/FormErrorIterator.php
+++ b/src/Symfony/Component/Form/FormErrorIterator.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form;
 
+use Symfony\Component\Form\Exception\BadMethodCallException;
 use Symfony\Component\Form\Exception\InvalidArgumentException;
 use Symfony\Component\Form\Exception\OutOfBoundsException;
-use Symfony\Component\Form\Exception\BadMethodCallException;
 use Symfony\Component\Validator\ConstraintViolation;
 
 /**
@@ -55,7 +55,7 @@ public function __construct(FormInterface $form, array $errors)
                     'The errors must be instances of '.
                     '"\Symfony\Component\Form\FormError" or "%s". Got: "%s".',
                     __CLASS__,
-                    is_object($error) ? get_class($error) : gettype($error)
+                    \is_object($error) ? \get_class($error) : \gettype($error)
                 ));
             }
         }
@@ -234,7 +234,7 @@ public function getChildren()
      */
     public function count()
     {
-        return count($this->errors);
+        return \count($this->errors);
     }
 
     /**
@@ -270,7 +270,7 @@ public function findByCodes($codes)
         $errors = array();
         foreach ($this as $error) {
             $cause = $error->getCause();
-            if ($cause instanceof ConstraintViolation && in_array($cause->getCode(), $codes, true)) {
+            if ($cause instanceof ConstraintViolation && \in_array($cause->getCode(), $codes, true)) {
                 $errors[] = $error;
             }
         }
diff --git a/src/Symfony/Component/Form/FormFactory.php b/src/Symfony/Component/Form/FormFactory.php
index 886cdee630ae..3f18ccf3259c 100644
--- a/src/Symfony/Component/Form/FormFactory.php
+++ b/src/Symfony/Component/Form/FormFactory.php
@@ -51,7 +51,7 @@ public function createForProperty($class, $property, $data = null, array $option
      */
     public function createBuilder($type = 'Symfony\Component\Form\Extension\Core\Type\FormType', $data = null, array $options = array())
     {
-        if (!is_string($type)) {
+        if (!\is_string($type)) {
             throw new UnexpectedTypeException($type, 'string');
         }
 
@@ -67,7 +67,7 @@ public function createNamedBuilder($name, $type = 'Symfony\Component\Form\Extens
             $options['data'] = $data;
         }
 
-        if (!is_string($type)) {
+        if (!\is_string($type)) {
             throw new UnexpectedTypeException($type, 'string');
         }
 
diff --git a/src/Symfony/Component/Form/FormFactoryBuilder.php b/src/Symfony/Component/Form/FormFactoryBuilder.php
index 2f72e7a9a977..3afe1f535960 100644
--- a/src/Symfony/Component/Form/FormFactoryBuilder.php
+++ b/src/Symfony/Component/Form/FormFactoryBuilder.php
@@ -144,8 +144,8 @@ public function getFormFactory()
     {
         $extensions = $this->extensions;
 
-        if (count($this->types) > 0 || count($this->typeExtensions) > 0 || count($this->typeGuessers) > 0) {
-            if (count($this->typeGuessers) > 1) {
+        if (\count($this->types) > 0 || \count($this->typeExtensions) > 0 || \count($this->typeGuessers) > 0) {
+            if (\count($this->typeGuessers) > 1) {
                 $typeGuesser = new FormTypeGuesserChain($this->typeGuessers);
             } else {
                 $typeGuesser = isset($this->typeGuessers[0]) ? $this->typeGuessers[0] : null;
diff --git a/src/Symfony/Component/Form/FormRegistry.php b/src/Symfony/Component/Form/FormRegistry.php
index cb8facdac076..67d114608032 100644
--- a/src/Symfony/Component/Form/FormRegistry.php
+++ b/src/Symfony/Component/Form/FormRegistry.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form;
 
 use Symfony\Component\Form\Exception\ExceptionInterface;
+use Symfony\Component\Form\Exception\InvalidArgumentException;
 use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
-use Symfony\Component\Form\Exception\InvalidArgumentException;
 
 /**
  * The central registry of the Form component.
@@ -110,7 +110,7 @@ private function resolveType(FormTypeInterface $type)
     {
         $typeExtensions = array();
         $parentType = $type->getParent();
-        $fqcn = get_class($type);
+        $fqcn = \get_class($type);
 
         if (isset($this->checkedTypes[$fqcn])) {
             $types = implode(' > ', array_merge(array_keys($this->checkedTypes), array($fqcn)));
diff --git a/src/Symfony/Component/Form/FormRenderer.php b/src/Symfony/Component/Form/FormRenderer.php
index 92f042de2c66..3ccf807fce48 100644
--- a/src/Symfony/Component/Form/FormRenderer.php
+++ b/src/Symfony/Component/Form/FormRenderer.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form;
 
-use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Form\Exception\BadMethodCallException;
+use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
 use Twig\Environment;
 
@@ -174,7 +174,7 @@ public function searchAndRenderBlock(FormView $view, $blockNameSuffix, array $va
             foreach ($view->vars['block_prefixes'] as $blockNamePrefix) {
                 $blockNameHierarchy[] = $blockNamePrefix.'_'.$blockNameSuffix;
             }
-            $hierarchyLevel = count($blockNameHierarchy) - 1;
+            $hierarchyLevel = \count($blockNameHierarchy) - 1;
 
             $hierarchyInit = true;
         } else {
@@ -218,7 +218,7 @@ public function searchAndRenderBlock(FormView $view, $blockNameSuffix, array $va
 
         // Escape if no resource exists for this block
         if (!$resource) {
-            if (count($blockNameHierarchy) !== count(array_unique($blockNameHierarchy))) {
+            if (\count($blockNameHierarchy) !== \count(array_unique($blockNameHierarchy))) {
                 throw new LogicException(sprintf('Unable to render the form because the block names array contains duplicates: "%s".', implode('", "', array_reverse($blockNameHierarchy))));
             }
 
diff --git a/src/Symfony/Component/Form/FormTypeGuesserChain.php b/src/Symfony/Component/Form/FormTypeGuesserChain.php
index ea6ba66149e7..c0cbd0bde1d9 100644
--- a/src/Symfony/Component/Form/FormTypeGuesserChain.php
+++ b/src/Symfony/Component/Form/FormTypeGuesserChain.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form;
 
-use Symfony\Component\Form\Guess\Guess;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\Guess\Guess;
 
 class FormTypeGuesserChain implements FormTypeGuesserInterface
 {
diff --git a/src/Symfony/Component/Form/FormView.php b/src/Symfony/Component/Form/FormView.php
index 9fbca4379688..25e9980f316c 100644
--- a/src/Symfony/Component/Form/FormView.php
+++ b/src/Symfony/Component/Form/FormView.php
@@ -63,7 +63,7 @@ public function __construct(self $parent = null)
      */
     public function isRendered()
     {
-        if (true === $this->rendered || 0 === count($this->children)) {
+        if (true === $this->rendered || 0 === \count($this->children)) {
             return $this->rendered;
         }
 
@@ -162,6 +162,6 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->children);
+        return \count($this->children);
     }
 }
diff --git a/src/Symfony/Component/Form/NativeRequestHandler.php b/src/Symfony/Component/Form/NativeRequestHandler.php
index 37e1c99a7450..ccebdab6d80a 100644
--- a/src/Symfony/Component/Form/NativeRequestHandler.php
+++ b/src/Symfony/Component/Form/NativeRequestHandler.php
@@ -78,7 +78,7 @@ public function handleRequest(FormInterface $form, $request = null)
                 $form->submit(null, false);
 
                 $form->addError(new FormError(
-                    call_user_func($form->getConfig()->getOption('upload_max_size_message')),
+                    \call_user_func($form->getConfig()->getOption('upload_max_size_message')),
                     null,
                     array('{{ max }}' => $this->serverParams->getNormalizedIniPostMaxSize())
                 ));
@@ -103,7 +103,7 @@ public function handleRequest(FormInterface $form, $request = null)
                 return;
             }
 
-            if (is_array($params) && is_array($files)) {
+            if (\is_array($params) && \is_array($files)) {
                 $data = array_replace_recursive($params, $files);
             } else {
                 $data = $params ?: $files;
@@ -111,7 +111,7 @@ public function handleRequest(FormInterface $form, $request = null)
         }
 
         // Don't auto-submit the form unless at least one field is present.
-        if ('' === $name && count(array_intersect_key($data, $form->all())) <= 0) {
+        if ('' === $name && \count(array_intersect_key($data, $form->all())) <= 0) {
             return;
         }
 
@@ -126,7 +126,7 @@ public function isFileUpload($data)
         // POST data will always be strings or arrays of strings. Thus, we can be sure
         // that the submitted data is a file upload if the "error" value is an integer
         // (this value must have been injected by PHP itself).
-        return is_array($data) && isset($data['error']) && is_int($data['error']);
+        return \is_array($data) && isset($data['error']) && \is_int($data['error']);
     }
 
     /**
@@ -166,14 +166,14 @@ private static function getRequestMethod()
      */
     private static function fixPhpFilesArray($data)
     {
-        if (!is_array($data)) {
+        if (!\is_array($data)) {
             return $data;
         }
 
         $keys = array_keys($data);
         sort($keys);
 
-        if (self::$fileKeys !== $keys || !isset($data['name']) || !is_array($data['name'])) {
+        if (self::$fileKeys !== $keys || !isset($data['name']) || !\is_array($data['name'])) {
             return $data;
         }
 
@@ -204,7 +204,7 @@ private static function fixPhpFilesArray($data)
      */
     private static function stripEmptyFiles($data)
     {
-        if (!is_array($data)) {
+        if (!\is_array($data)) {
             return $data;
         }
 
diff --git a/src/Symfony/Component/Form/PreloadedExtension.php b/src/Symfony/Component/Form/PreloadedExtension.php
index be720a343045..b26dbe638d8c 100644
--- a/src/Symfony/Component/Form/PreloadedExtension.php
+++ b/src/Symfony/Component/Form/PreloadedExtension.php
@@ -37,7 +37,7 @@ public function __construct(array $types, array $typeExtensions, FormTypeGuesser
         $this->typeGuesser = $typeGuesser;
 
         foreach ($types as $type) {
-            $this->types[get_class($type)] = $type;
+            $this->types[\get_class($type)] = $type;
         }
     }
 
diff --git a/src/Symfony/Component/Form/ResolvedFormType.php b/src/Symfony/Component/Form/ResolvedFormType.php
index b71be3ceb0a5..4a0c9588a7d5 100644
--- a/src/Symfony/Component/Form/ResolvedFormType.php
+++ b/src/Symfony/Component/Form/ResolvedFormType.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form;
 
-use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 /**
diff --git a/src/Symfony/Component/Form/Test/FormIntegrationTestCase.php b/src/Symfony/Component/Form/Test/FormIntegrationTestCase.php
index e3ee8ebe4b01..28e6cb385efa 100644
--- a/src/Symfony/Component/Form/Test/FormIntegrationTestCase.php
+++ b/src/Symfony/Component/Form/Test/FormIntegrationTestCase.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Test;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Form\Forms;
 use Symfony\Component\Form\FormFactoryInterface;
+use Symfony\Component\Form\Forms;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
diff --git a/src/Symfony/Component/Form/Test/FormPerformanceTestCase.php b/src/Symfony/Component/Form/Test/FormPerformanceTestCase.php
index dfb4ffaa0115..a6d8dc7411d9 100644
--- a/src/Symfony/Component/Form/Test/FormPerformanceTestCase.php
+++ b/src/Symfony/Component/Form/Test/FormPerformanceTestCase.php
@@ -54,7 +54,7 @@ protected function runTest()
      */
     public function setMaxRunningTime($maxRunningTime)
     {
-        if (is_int($maxRunningTime) && $maxRunningTime >= 0) {
+        if (\is_int($maxRunningTime) && $maxRunningTime >= 0) {
             $this->maxRunningTime = $maxRunningTime;
         } else {
             throw new \InvalidArgumentException();
diff --git a/src/Symfony/Component/Form/Test/TypeTestCase.php b/src/Symfony/Component/Form/Test/TypeTestCase.php
index 346dc6164889..aa7516f56358 100644
--- a/src/Symfony/Component/Form/Test/TypeTestCase.php
+++ b/src/Symfony/Component/Form/Test/TypeTestCase.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form\Test;
 
-use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\Form\Test\Traits\ValidatorExtensionTrait;
 
 abstract class TypeTestCase extends FormIntegrationTestCase
@@ -37,7 +37,7 @@ protected function setUp()
 
     protected function tearDown()
     {
-        if (in_array(ValidatorExtensionTrait::class, class_uses($this))) {
+        if (\in_array(ValidatorExtensionTrait::class, class_uses($this))) {
             $this->validator = null;
         }
     }
@@ -46,7 +46,7 @@ protected function getExtensions()
     {
         $extensions = array();
 
-        if (in_array(ValidatorExtensionTrait::class, class_uses($this))) {
+        if (\in_array(ValidatorExtensionTrait::class, class_uses($this))) {
             $extensions[] = $this->getValidatorExtension();
         }
 
diff --git a/src/Symfony/Component/Form/Tests/AbstractFormTest.php b/src/Symfony/Component/Form/Tests/AbstractFormTest.php
index 4c93e0cc42a1..977b5f40e0ec 100644
--- a/src/Symfony/Component/Form/Tests/AbstractFormTest.php
+++ b/src/Symfony/Component/Form/Tests/AbstractFormTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Form\FormBuilder;
 
 abstract class AbstractFormTest extends TestCase
 {
diff --git a/src/Symfony/Component/Form/Tests/AbstractLayoutTest.php b/src/Symfony/Component/Form/Tests/AbstractLayoutTest.php
index 09a9b638bd45..bb33665939c3 100644
--- a/src/Symfony/Component/Form/Tests/AbstractLayoutTest.php
+++ b/src/Symfony/Component/Form/Tests/AbstractLayoutTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form\Tests;
 
+use Symfony\Component\Form\Extension\Csrf\CsrfExtension;
 use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Extension\Csrf\CsrfExtension;
 use Symfony\Component\Form\Test\FormIntegrationTestCase;
 
 abstract class AbstractLayoutTest extends FormIntegrationTestCase
@@ -23,7 +23,7 @@ abstract class AbstractLayoutTest extends FormIntegrationTestCase
 
     protected function setUp()
     {
-        if (!extension_loaded('intl')) {
+        if (!\extension_loaded('intl')) {
             $this->markTestSkipped('Extension intl is required.');
         }
 
diff --git a/src/Symfony/Component/Form/Tests/ChoiceList/Factory/CachingFactoryDecoratorTest.php b/src/Symfony/Component/Form/Tests/ChoiceList/Factory/CachingFactoryDecoratorTest.php
index b038865fd803..dd6c968bd84b 100644
--- a/src/Symfony/Component/Form/Tests/ChoiceList/Factory/CachingFactoryDecoratorTest.php
+++ b/src/Symfony/Component/Form/Tests/ChoiceList/Factory/CachingFactoryDecoratorTest.php
@@ -486,7 +486,7 @@ public function provideSameChoices()
             array(0, 0),
             array('a', 'a'),
             // https://github.com/symfony/symfony/issues/10409
-            array(chr(181).'meter', chr(181).'meter'), // UTF-8
+            array(\chr(181).'meter', \chr(181).'meter'), // UTF-8
             array($object, $object),
         );
     }
@@ -516,7 +516,7 @@ public function provideSameKeyChoices()
             array(0, 0),
             array(0, '0'),
             array('a', 'a'),
-            array(chr(181).'meter', chr(181).'meter'),
+            array(\chr(181).'meter', \chr(181).'meter'),
         );
     }
 
diff --git a/src/Symfony/Component/Form/Tests/CompoundFormTest.php b/src/Symfony/Component/Form/Tests/CompoundFormTest.php
index 85813a1ffbc3..336593f7f763 100644
--- a/src/Symfony/Component/Form/Tests/CompoundFormTest.php
+++ b/src/Symfony/Component/Form/Tests/CompoundFormTest.php
@@ -17,9 +17,9 @@
 use Symfony\Component\Form\Forms;
 use Symfony\Component\Form\FormView;
 use Symfony\Component\Form\SubmitButtonBuilder;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\File\UploadedFile;
 use Symfony\Component\Form\Tests\Fixtures\FixedDataTransformer;
+use Symfony\Component\HttpFoundation\File\UploadedFile;
+use Symfony\Component\HttpFoundation\Request;
 
 class CompoundFormTest extends AbstractFormTest
 {
diff --git a/src/Symfony/Component/Form/Tests/DependencyInjection/FormPassTest.php b/src/Symfony/Component/Form/Tests/DependencyInjection/FormPassTest.php
index 59e2262efc41..f5939b40e09c 100644
--- a/src/Symfony/Component/Form/Tests/DependencyInjection/FormPassTest.php
+++ b/src/Symfony/Component/Form/Tests/DependencyInjection/FormPassTest.php
@@ -14,12 +14,12 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
-use Symfony\Component\Form\DependencyInjection\FormPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceLocator;
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\DependencyInjection\FormPass;
 use Symfony\Component\Form\FormRegistryInterface;
 
 /**
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataMapper/PropertyPathMapperTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataMapper/PropertyPathMapperTest.php
index e99b7e2715b9..bcc5933a9fef 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataMapper/PropertyPathMapperTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataMapper/PropertyPathMapperTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Tests\Extension\Core\DataMapper;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Form\Extension\Core\DataMapper\PropertyPathMapper;
 use Symfony\Component\Form\FormConfigBuilder;
 use Symfony\Component\Form\FormConfigInterface;
-use Symfony\Component\Form\Extension\Core\DataMapper\PropertyPathMapper;
 
 class PropertyPathMapperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateIntervalToArrayTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateIntervalToArrayTransformerTest.php
index e5735dfca34f..a75fe1145c57 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateIntervalToArrayTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateIntervalToArrayTransformerTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form\Tests\Extension\Core\DataTransformer;
 
-use Symfony\Component\Form\Extension\Core\DataTransformer\DateIntervalToArrayTransformer;
 use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\Extension\Core\DataTransformer\DateIntervalToArrayTransformer;
 
 /**
  * @author Steffen Roßkamp <steffen.rosskamp@gimmickmedia.de>
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateIntervalToStringTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateIntervalToStringTransformerTest.php
index 9b831118c2ea..389e0c161d04 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateIntervalToStringTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateIntervalToStringTransformerTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form\Tests\Extension\Core\DataTransformer;
 
-use Symfony\Component\Form\Extension\Core\DataTransformer\DateIntervalToStringTransformer;
 use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\Extension\Core\DataTransformer\DateIntervalToStringTransformer;
 
 /**
  * @author Steffen Roßkamp <steffen.rosskamp@gimmickmedia.de>
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeZoneToStringTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeZoneToStringTransformerTest.php
index 51442ecbf905..e6560d7558f3 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeZoneToStringTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeZoneToStringTransformerTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form\Tests\Extension\Core\DataTransformer;
 
-use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeZoneToStringTransformer;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeZoneToStringTransformer;
 
 class DateTimeZoneToStringTransformerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/FixUrlProtocolListenerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/FixUrlProtocolListenerTest.php
index e3fd9523d96d..454aaa85617c 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/FixUrlProtocolListenerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/FixUrlProtocolListenerTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Tests\Extension\Core\EventListener;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\Extension\Core\EventListener\FixUrlProtocolListener;
+use Symfony\Component\Form\FormEvent;
 
 class FixUrlProtocolListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/MergeCollectionListenerCustomArrayObjectTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/MergeCollectionListenerCustomArrayObjectTest.php
index 5eb6c7b9fdbd..76bdc7682366 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/MergeCollectionListenerCustomArrayObjectTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/MergeCollectionListenerCustomArrayObjectTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Form\Tests\Extension\Core\EventListener;
 
-use Symfony\Component\Form\Tests\Fixtures\CustomArrayObject;
 use Symfony\Component\Form\FormBuilder;
+use Symfony\Component\Form\Tests\Fixtures\CustomArrayObject;
 
 class MergeCollectionListenerCustomArrayObjectTest extends MergeCollectionListenerTest
 {
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/MergeCollectionListenerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/MergeCollectionListenerTest.php
index 2dcbc359eab9..627d7bb3f1e6 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/MergeCollectionListenerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/MergeCollectionListenerTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Tests\Extension\Core\EventListener;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\Extension\Core\EventListener\MergeCollectionListener;
+use Symfony\Component\Form\FormEvent;
 
 abstract class MergeCollectionListenerTest extends TestCase
 {
@@ -85,7 +85,7 @@ public function testAddExtraEntriesIfAllowAdd($allowDelete)
         $listener->onSubmit($event);
 
         // The original object was modified
-        if (is_object($originalData)) {
+        if (\is_object($originalData)) {
             $this->assertSame($originalData, $event->getData());
         }
 
@@ -109,7 +109,7 @@ public function testAddExtraEntriesIfAllowAddDontOverwriteExistingIndices($allow
         $listener->onSubmit($event);
 
         // The original object was modified
-        if (is_object($originalData)) {
+        if (\is_object($originalData)) {
             $this->assertSame($originalData, $event->getData());
         }
 
@@ -134,7 +134,7 @@ public function testDoNothingIfNotAllowAdd($allowDelete)
         $listener->onSubmit($event);
 
         // We still have the original object
-        if (is_object($originalData)) {
+        if (\is_object($originalData)) {
             $this->assertSame($originalData, $event->getData());
         }
 
@@ -158,7 +158,7 @@ public function testRemoveMissingEntriesIfAllowDelete($allowAdd)
         $listener->onSubmit($event);
 
         // The original object was modified
-        if (is_object($originalData)) {
+        if (\is_object($originalData)) {
             $this->assertSame($originalData, $event->getData());
         }
 
@@ -183,7 +183,7 @@ public function testDoNothingIfNotAllowDelete($allowAdd)
         $listener->onSubmit($event);
 
         // We still have the original object
-        if (is_object($originalData)) {
+        if (\is_object($originalData)) {
             $this->assertSame($originalData, $event->getData());
         }
 
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/TrimListenerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/TrimListenerTest.php
index 3cfa0607f75a..1ecd3ad705cf 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/TrimListenerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/EventListener/TrimListenerTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Form\Tests\Extension\Core\EventListener;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\Extension\Core\EventListener\TrimListener;
+use Symfony\Component\Form\FormEvent;
 
 class TrimListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php
index 1f2432325179..e12ab6ff9311 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php
@@ -112,7 +112,7 @@ public function testExpandedChoicesOptionsTurnIntoChildren()
             'choices' => $this->choices,
         ));
 
-        $this->assertCount(count($this->choices), $form, 'Each choice should become a new field');
+        $this->assertCount(\count($this->choices), $form, 'Each choice should become a new field');
     }
 
     public function testChoiceListWithScalarValues()
@@ -197,7 +197,7 @@ public function testPlaceholderPresentOnNonRequiredExpandedSingleChoice()
         ));
 
         $this->assertArrayHasKey('placeholder', $form);
-        $this->assertCount(count($this->choices) + 1, $form, 'Each choice should become a new field');
+        $this->assertCount(\count($this->choices) + 1, $form, 'Each choice should become a new field');
     }
 
     public function testPlaceholderNotPresentIfRequired()
@@ -210,7 +210,7 @@ public function testPlaceholderNotPresentIfRequired()
         ));
 
         $this->assertArrayNotHasKey('placeholder', $form);
-        $this->assertCount(count($this->choices), $form, 'Each choice should become a new field');
+        $this->assertCount(\count($this->choices), $form, 'Each choice should become a new field');
     }
 
     public function testPlaceholderNotPresentIfMultiple()
@@ -223,7 +223,7 @@ public function testPlaceholderNotPresentIfMultiple()
         ));
 
         $this->assertArrayNotHasKey('placeholder', $form);
-        $this->assertCount(count($this->choices), $form, 'Each choice should become a new field');
+        $this->assertCount(\count($this->choices), $form, 'Each choice should become a new field');
     }
 
     public function testPlaceholderNotPresentIfEmptyChoice()
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/FormTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/FormTypeTest.php
index ef2edd5a7d11..d7e958d55970 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/FormTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/FormTypeTest.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Form\Tests\Extension\Core\Type;
 
-use Symfony\Component\PropertyAccess\PropertyPath;
 use Symfony\Component\Form\CallbackTransformer;
+use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\Tests\Fixtures\Author;
 use Symfony\Component\Form\Tests\Fixtures\FixedDataTransformer;
-use Symfony\Component\Form\FormError;
+use Symfony\Component\PropertyAccess\PropertyPath;
 
 class FormTest_AuthorWithoutRefSetter
 {
@@ -40,7 +40,7 @@ public function getReference()
     // to update it
     public function getReferenceCopy()
     {
-        return is_object($this->referenceCopy) ? clone $this->referenceCopy : $this->referenceCopy;
+        return \is_object($this->referenceCopy) ? clone $this->referenceCopy : $this->referenceCopy;
     }
 
     public function setReferenceCopy($reference)
diff --git a/src/Symfony/Component/Form/Tests/Extension/Csrf/EventListener/CsrfValidationListenerTest.php b/src/Symfony/Component/Form/Tests/Extension/Csrf/EventListener/CsrfValidationListenerTest.php
index 47f9e43294ba..e9d9947774bc 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Csrf/EventListener/CsrfValidationListenerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Csrf/EventListener/CsrfValidationListenerTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Form\Tests\Extension\Csrf\EventListener;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Form\Extension\Csrf\EventListener\CsrfValidationListener;
 use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\Form\FormEvent;
-use Symfony\Component\Form\Extension\Csrf\EventListener\CsrfValidationListener;
 
 class CsrfValidationListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Form/Tests/Extension/Csrf/Type/FormTypeCsrfExtensionTest.php b/src/Symfony/Component/Form/Tests/Extension/Csrf/Type/FormTypeCsrfExtensionTest.php
index 6432ac688996..599a14a3e665 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Csrf/Type/FormTypeCsrfExtensionTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Csrf/Type/FormTypeCsrfExtensionTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Form\Tests\Extension\Csrf\Type;
 
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Csrf\CsrfExtension;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\Test\TypeTestCase;
-use Symfony\Component\Form\Extension\Csrf\CsrfExtension;
 use Symfony\Component\Security\Csrf\CsrfToken;
 
 class FormTypeCsrfExtensionTest_ChildType extends AbstractType
@@ -391,7 +391,7 @@ public function testsTranslateCustomErrorMessage()
         $expected = new FormError('[trans]Foobar[/trans]');
         $expected->setOrigin($form);
 
-        $this->assertGreaterThan(0, count($errors));
+        $this->assertGreaterThan(0, \count($errors));
         $this->assertEquals($expected, $errors[0]);
     }
 }
diff --git a/src/Symfony/Component/Form/Tests/Extension/DataCollector/FormDataCollectorTest.php b/src/Symfony/Component/Form/Tests/Extension/DataCollector/FormDataCollectorTest.php
index bd3f25bffb2a..3bfef602531f 100644
--- a/src/Symfony/Component/Form/Tests/Extension/DataCollector/FormDataCollectorTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/DataCollector/FormDataCollectorTest.php
@@ -353,7 +353,7 @@ public function testSerializeWithFormAddedMultipleTimes()
         $form2View = new FormView();
         $child1View = new FormView();
         $child1View->vars['is_selected'] = function ($choice, array $values) {
-            return in_array($choice, $values, true);
+            return \in_array($choice, $values, true);
         };
 
         $form1->add($child1);
diff --git a/src/Symfony/Component/Form/Tests/Extension/HttpFoundation/HttpFoundationRequestHandlerTest.php b/src/Symfony/Component/Form/Tests/Extension/HttpFoundation/HttpFoundationRequestHandlerTest.php
index 9fbe12258311..e694e405792c 100644
--- a/src/Symfony/Component/Form/Tests/Extension/HttpFoundation/HttpFoundationRequestHandlerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/HttpFoundation/HttpFoundationRequestHandlerTest.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Form\Extension\HttpFoundation\HttpFoundationRequestHandler;
 use Symfony\Component\Form\Tests\AbstractRequestHandlerTest;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
+use Symfony\Component\HttpFoundation\Request;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php
index 6301d2bf8af4..67431656a1f3 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php
@@ -11,16 +11,16 @@
 
 namespace Symfony\Component\Form\Tests\Extension\Validator\Constraints;
 
-use Symfony\Component\Form\FormBuilder;
-use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\CallbackTransformer;
-use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\Extension\Validator\Constraints\Form;
 use Symfony\Component\Form\Extension\Validator\Constraints\FormValidator;
+use Symfony\Component\Form\FormBuilder;
+use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\SubmitButtonBuilder;
 use Symfony\Component\Validator\Constraints\GroupSequence;
-use Symfony\Component\Validator\Constraints\NotNull;
 use Symfony\Component\Validator\Constraints\NotBlank;
+use Symfony\Component\Validator\Constraints\NotNull;
 use Symfony\Component\Validator\Constraints\Valid;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
 
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/EventListener/ValidationListenerTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/EventListener/ValidationListenerTest.php
index 8694f93436b5..ae161819c7b5 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/EventListener/ValidationListenerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/EventListener/ValidationListenerTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Form\Tests\Extension\Validator\EventListener;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Form\FormBuilder;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\Extension\Validator\Constraints\Form;
 use Symfony\Component\Form\Extension\Validator\EventListener\ValidationListener;
+use Symfony\Component\Form\FormBuilder;
+use Symfony\Component\Form\FormEvent;
 use Symfony\Component\PropertyAccess\PropertyPath;
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationList;
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/Type/UploadValidatorExtensionTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/Type/UploadValidatorExtensionTest.php
index 17792b67454f..7d4178bc83ea 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/Type/UploadValidatorExtensionTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/Type/UploadValidatorExtensionTest.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Form\Extension\Validator\Type\UploadValidatorExtension;
 use Symfony\Component\Form\Test\TypeTestCase;
-use Symfony\Component\OptionsResolver\OptionsResolver;
 use Symfony\Component\OptionsResolver\Options;
+use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class UploadValidatorExtensionTest extends TypeTestCase
 {
@@ -40,6 +40,6 @@ public function testPostMaxSizeTranslation()
         $extension->configureOptions($resolver);
         $options = $resolver->resolve();
 
-        $this->assertEquals('translated max {{ max }}!', call_user_func($options['upload_max_size_message']));
+        $this->assertEquals('translated max {{ max }}!', \call_user_func($options['upload_max_size_message']));
     }
 }
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorTypeGuesserTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorTypeGuesserTest.php
index 7d4773725393..1a743cdfe856 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorTypeGuesserTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorTypeGuesserTest.php
@@ -16,11 +16,11 @@
 use Symfony\Component\Form\Guess\Guess;
 use Symfony\Component\Form\Guess\ValueGuess;
 use Symfony\Component\Validator\Constraints\Email;
+use Symfony\Component\Validator\Constraints\IsTrue;
 use Symfony\Component\Validator\Constraints\Length;
 use Symfony\Component\Validator\Constraints\NotBlank;
 use Symfony\Component\Validator\Constraints\NotNull;
 use Symfony\Component\Validator\Constraints\Range;
-use Symfony\Component\Validator\Constraints\IsTrue;
 use Symfony\Component\Validator\Constraints\Type;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/ViolationMapper/ViolationMapperTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/ViolationMapper/ViolationMapperTest.php
index 53243c88f74d..66e2dafff8d5 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/ViolationMapper/ViolationMapperTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/ViolationMapper/ViolationMapperTest.php
@@ -12,13 +12,13 @@
 namespace Symfony\Component\Form\Tests\Extension\Validator\ViolationMapper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Form\Extension\Validator\ViolationMapper\ViolationMapper;
-use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\CallbackTransformer;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+use Symfony\Component\Form\Extension\Validator\ViolationMapper\ViolationMapper;
 use Symfony\Component\Form\Form;
-use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormConfigBuilder;
 use Symfony\Component\Form\FormError;
+use Symfony\Component\Form\FormInterface;
 use Symfony\Component\PropertyAccess\PropertyPath;
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationInterface;
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/ViolationMapper/ViolationPathTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/ViolationMapper/ViolationPathTest.php
index 88d5169cd7a4..2e1c9f673daa 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/ViolationMapper/ViolationPathTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/ViolationMapper/ViolationPathTest.php
@@ -96,8 +96,8 @@ public function testCreatePath($string, $entries, $slicedPath = null)
         $path = new ViolationPath($string);
 
         $this->assertSame($slicedPath, $path->__toString());
-        $this->assertCount(count($entries), $path->getElements());
-        $this->assertSame(count($entries), $path->getLength());
+        $this->assertCount(\count($entries), $path->getElements());
+        $this->assertSame(\count($entries), $path->getLength());
 
         foreach ($entries as $index => $entry) {
             $this->assertEquals($entry[0], $path->getElement($index));
diff --git a/src/Symfony/Component/Form/Tests/Fixtures/AlternatingRowType.php b/src/Symfony/Component/Form/Tests/Fixtures/AlternatingRowType.php
index a558e3a6d290..ea576af8f51a 100644
--- a/src/Symfony/Component/Form/Tests/Fixtures/AlternatingRowType.php
+++ b/src/Symfony/Component/Form/Tests/Fixtures/AlternatingRowType.php
@@ -3,9 +3,9 @@
 namespace Symfony\Component\Form\Tests\Fixtures;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 
 class AlternatingRowType extends AbstractType
 {
diff --git a/src/Symfony/Component/Form/Tests/Fixtures/CustomArrayObject.php b/src/Symfony/Component/Form/Tests/Fixtures/CustomArrayObject.php
index 950f677fd061..91b277303732 100644
--- a/src/Symfony/Component/Form/Tests/Fixtures/CustomArrayObject.php
+++ b/src/Symfony/Component/Form/Tests/Fixtures/CustomArrayObject.php
@@ -55,7 +55,7 @@ public function getIterator()
 
     public function count()
     {
-        return count($this->array);
+        return \count($this->array);
     }
 
     public function serialize()
diff --git a/src/Symfony/Component/Form/Tests/Fixtures/FixedFilterListener.php b/src/Symfony/Component/Form/Tests/Fixtures/FixedFilterListener.php
index 762a10b8c95f..5a85ea8d1980 100644
--- a/src/Symfony/Component/Form/Tests/Fixtures/FixedFilterListener.php
+++ b/src/Symfony/Component/Form/Tests/Fixtures/FixedFilterListener.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Form\Tests\Fixtures;
 
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\FormEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 
 class FixedFilterListener implements EventSubscriberInterface
 {
diff --git a/src/Symfony/Component/Form/Tests/Fixtures/TestExtension.php b/src/Symfony/Component/Form/Tests/Fixtures/TestExtension.php
index 042bee51280e..bdbc5a9c1cfb 100644
--- a/src/Symfony/Component/Form/Tests/Fixtures/TestExtension.php
+++ b/src/Symfony/Component/Form/Tests/Fixtures/TestExtension.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Form\Tests\Fixtures;
 
-use Symfony\Component\Form\FormTypeInterface;
+use Symfony\Component\Form\FormExtensionInterface;
 use Symfony\Component\Form\FormTypeExtensionInterface;
 use Symfony\Component\Form\FormTypeGuesserInterface;
-use Symfony\Component\Form\FormExtensionInterface;
+use Symfony\Component\Form\FormTypeInterface;
 
 class TestExtension implements FormExtensionInterface
 {
@@ -31,7 +31,7 @@ public function __construct(FormTypeGuesserInterface $guesser)
 
     public function addType(FormTypeInterface $type)
     {
-        $this->types[get_class($type)] = $type;
+        $this->types[\get_class($type)] = $type;
     }
 
     public function getType($name)
diff --git a/src/Symfony/Component/Form/Tests/FormFactoryBuilderTest.php b/src/Symfony/Component/Form/Tests/FormFactoryBuilderTest.php
index 854f4f347f75..3e66ce8c38be 100644
--- a/src/Symfony/Component/Form/Tests/FormFactoryBuilderTest.php
+++ b/src/Symfony/Component/Form/Tests/FormFactoryBuilderTest.php
@@ -41,7 +41,7 @@ public function testAddType()
         $extensions = $registry->getExtensions();
 
         $this->assertCount(1, $extensions);
-        $this->assertTrue($extensions[0]->hasType(get_class($this->type)));
+        $this->assertTrue($extensions[0]->hasType(\get_class($this->type)));
         $this->assertNull($extensions[0]->getTypeGuesser());
     }
 
diff --git a/src/Symfony/Component/Form/Tests/FormFactoryTest.php b/src/Symfony/Component/Form/Tests/FormFactoryTest.php
index 6029f34a8c4e..ce65e05bb170 100644
--- a/src/Symfony/Component/Form/Tests/FormFactoryTest.php
+++ b/src/Symfony/Component/Form/Tests/FormFactoryTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Form\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Form\FormTypeGuesserChain;
 use Symfony\Component\Form\FormFactory;
+use Symfony\Component\Form\FormTypeGuesserChain;
 use Symfony\Component\Form\Guess\Guess;
-use Symfony\Component\Form\Guess\ValueGuess;
 use Symfony\Component\Form\Guess\TypeGuess;
+use Symfony\Component\Form\Guess\ValueGuess;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
diff --git a/src/Symfony/Component/Form/Tests/FormRegistryTest.php b/src/Symfony/Component/Form/Tests/FormRegistryTest.php
index b304eaed40fb..ca38c7a8b294 100644
--- a/src/Symfony/Component/Form/Tests/FormRegistryTest.php
+++ b/src/Symfony/Component/Form/Tests/FormRegistryTest.php
@@ -16,14 +16,14 @@
 use Symfony\Component\Form\FormTypeGuesserChain;
 use Symfony\Component\Form\ResolvedFormType;
 use Symfony\Component\Form\ResolvedFormTypeFactoryInterface;
-use Symfony\Component\Form\Tests\Fixtures\FormWithSameParentType;
-use Symfony\Component\Form\Tests\Fixtures\RecursiveFormTypeBar;
-use Symfony\Component\Form\Tests\Fixtures\RecursiveFormTypeBaz;
-use Symfony\Component\Form\Tests\Fixtures\RecursiveFormTypeFoo;
 use Symfony\Component\Form\Tests\Fixtures\FooSubType;
 use Symfony\Component\Form\Tests\Fixtures\FooType;
 use Symfony\Component\Form\Tests\Fixtures\FooTypeBarExtension;
 use Symfony\Component\Form\Tests\Fixtures\FooTypeBazExtension;
+use Symfony\Component\Form\Tests\Fixtures\FormWithSameParentType;
+use Symfony\Component\Form\Tests\Fixtures\RecursiveFormTypeBar;
+use Symfony\Component\Form\Tests\Fixtures\RecursiveFormTypeBaz;
+use Symfony\Component\Form\Tests\Fixtures\RecursiveFormTypeFoo;
 use Symfony\Component\Form\Tests\Fixtures\TestExtension;
 
 /**
@@ -86,7 +86,7 @@ public function testGetTypeFromExtension()
             ->with($type)
             ->willReturn($resolvedType);
 
-        $this->assertSame($resolvedType, $this->registry->getType(get_class($type)));
+        $this->assertSame($resolvedType, $this->registry->getType(\get_class($type)));
     }
 
     public function testLoadUnregisteredType()
@@ -134,7 +134,7 @@ public function testGetTypeWithTypeExtensions()
             ->with($type, array($ext1, $ext2))
             ->willReturn($resolvedType);
 
-        $this->assertSame($resolvedType, $this->registry->getType(get_class($type)));
+        $this->assertSame($resolvedType, $this->registry->getType(\get_class($type)));
     }
 
     public function testGetTypeConnectsParent()
@@ -157,7 +157,7 @@ public function testGetTypeConnectsParent()
             ->with($type, array(), $parentResolvedType)
             ->willReturn($resolvedType);
 
-        $this->assertSame($resolvedType, $this->registry->getType(get_class($type)));
+        $this->assertSame($resolvedType, $this->registry->getType(\get_class($type)));
     }
 
     /**
@@ -210,7 +210,7 @@ public function testHasTypeAfterLoadingFromExtension()
 
         $this->extension2->addType($type);
 
-        $this->assertTrue($this->registry->hasType(get_class($type)));
+        $this->assertTrue($this->registry->hasType(\get_class($type)));
     }
 
     public function testHasTypeIfFQCN()
diff --git a/src/Symfony/Component/Form/Tests/ResolvedFormTypeTest.php b/src/Symfony/Component/Form/Tests/ResolvedFormTypeTest.php
index dcdba550c487..ca9ec14252ca 100644
--- a/src/Symfony/Component/Form/Tests/ResolvedFormTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/ResolvedFormTypeTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Form\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\Form\FormTypeExtensionInterface;
 use Symfony\Component\Form\FormTypeInterface;
 use Symfony\Component\Form\ResolvedFormType;
-use Symfony\Component\Form\FormBuilder;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 /**
diff --git a/src/Symfony/Component/Form/Tests/Resources/TranslationFilesTest.php b/src/Symfony/Component/Form/Tests/Resources/TranslationFilesTest.php
index 6d3dae218caf..d0bc82e75965 100644
--- a/src/Symfony/Component/Form/Tests/Resources/TranslationFilesTest.php
+++ b/src/Symfony/Component/Form/Tests/Resources/TranslationFilesTest.php
@@ -33,15 +33,15 @@ public function provideTranslationFiles()
     {
         return array_map(
             function ($filePath) { return (array) $filePath; },
-            glob(dirname(dirname(__DIR__)).'/Resources/translations/*.xlf')
+            glob(\dirname(\dirname(__DIR__)).'/Resources/translations/*.xlf')
         );
     }
 
     public function testNorwegianAlias()
     {
         $this->assertFileEquals(
-            dirname(dirname(__DIR__)).'/Resources/translations/validators.nb.xlf',
-            dirname(dirname(__DIR__)).'/Resources/translations/validators.no.xlf',
+            \dirname(\dirname(__DIR__)).'/Resources/translations/validators.nb.xlf',
+            \dirname(\dirname(__DIR__)).'/Resources/translations/validators.no.xlf',
             'The NO locale should be an alias for the NB variant of the Norwegian language.'
         );
     }
diff --git a/src/Symfony/Component/Form/Tests/SimpleFormTest.php b/src/Symfony/Component/Form/Tests/SimpleFormTest.php
index 36caf2d15b9f..cb3736ea3702 100644
--- a/src/Symfony/Component/Form/Tests/SimpleFormTest.php
+++ b/src/Symfony/Component/Form/Tests/SimpleFormTest.php
@@ -11,16 +11,16 @@
 
 namespace Symfony\Component\Form\Tests;
 
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\Form;
-use Symfony\Component\Form\FormEvent;
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\PropertyAccess\PropertyPath;
 use Symfony\Component\Form\FormConfigBuilder;
 use Symfony\Component\Form\FormError;
-use Symfony\Component\Form\Exception\TransformationFailedException;
-use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\Tests\Fixtures\FixedDataTransformer;
 use Symfony\Component\Form\Tests\Fixtures\FixedFilterListener;
+use Symfony\Component\PropertyAccess\PropertyPath;
 
 class SimpleFormTest_Countable implements \Countable
 {
diff --git a/src/Symfony/Component/Form/Util/OrderedHashMap.php b/src/Symfony/Component/Form/Util/OrderedHashMap.php
index 24ec0d529902..6a97559850a3 100644
--- a/src/Symfony/Component/Form/Util/OrderedHashMap.php
+++ b/src/Symfony/Component/Form/Util/OrderedHashMap.php
@@ -169,6 +169,6 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->elements);
+        return \count($this->elements);
     }
 }
diff --git a/src/Symfony/Component/Form/Util/OrderedHashMapIterator.php b/src/Symfony/Component/Form/Util/OrderedHashMapIterator.php
index d9d874af61a1..3de636392dd8 100644
--- a/src/Symfony/Component/Form/Util/OrderedHashMapIterator.php
+++ b/src/Symfony/Component/Form/Util/OrderedHashMapIterator.php
@@ -73,7 +73,7 @@ public function __construct(array &$elements, array &$orderedKeys, array &$manag
         $this->elements = &$elements;
         $this->orderedKeys = &$orderedKeys;
         $this->managedCursors = &$managedCursors;
-        $this->cursorId = count($managedCursors);
+        $this->cursorId = \count($managedCursors);
 
         $this->managedCursors[$this->cursorId] = &$this->cursor;
     }
diff --git a/src/Symfony/Component/Form/Util/ServerParams.php b/src/Symfony/Component/Form/Util/ServerParams.php
index fc5e9dd27ad3..3d5b76a7c27c 100644
--- a/src/Symfony/Component/Form/Util/ServerParams.php
+++ b/src/Symfony/Component/Form/Util/ServerParams.php
@@ -53,9 +53,9 @@ public function getPostMaxSize()
 
         $max = ltrim($iniMax, '+');
         if (0 === strpos($max, '0x')) {
-            $max = intval($max, 16);
+            $max = \intval($max, 16);
         } elseif (0 === strpos($max, '0')) {
-            $max = intval($max, 8);
+            $max = \intval($max, 8);
         } else {
             $max = (int) $max;
         }
diff --git a/src/Symfony/Component/HttpFoundation/AcceptHeaderItem.php b/src/Symfony/Component/HttpFoundation/AcceptHeaderItem.php
index 367531496e23..26f30481245f 100644
--- a/src/Symfony/Component/HttpFoundation/AcceptHeaderItem.php
+++ b/src/Symfony/Component/HttpFoundation/AcceptHeaderItem.php
@@ -53,7 +53,7 @@ public static function fromString($itemValue)
                 $attributes[$bit] = null;
             } else {
                 $parts = explode('=', $bit);
-                $attributes[$parts[0]] = isset($parts[1]) && strlen($parts[1]) > 0 ? $parts[1] : '';
+                $attributes[$parts[0]] = isset($parts[1]) && \strlen($parts[1]) > 0 ? $parts[1] : '';
             }
         }
 
@@ -68,7 +68,7 @@ public static function fromString($itemValue)
     public function __toString()
     {
         $string = $this->value.($this->quality < 1 ? ';q='.$this->quality : '');
-        if (count($this->attributes) > 0) {
+        if (\count($this->attributes) > 0) {
             $string .= ';'.implode(';', array_map(function ($name, $value) {
                 return sprintf(preg_match('/[,;=]/', $value) ? '%s="%s"' : '%s=%s', $name, $value);
             }, array_keys($this->attributes), $this->attributes));
diff --git a/src/Symfony/Component/HttpFoundation/ApacheRequest.php b/src/Symfony/Component/HttpFoundation/ApacheRequest.php
index 84803ebae28f..4e99186dcd50 100644
--- a/src/Symfony/Component/HttpFoundation/ApacheRequest.php
+++ b/src/Symfony/Component/HttpFoundation/ApacheRequest.php
@@ -35,7 +35,7 @@ protected function prepareBaseUrl()
 
         if (false === strpos($this->server->get('REQUEST_URI'), $baseUrl)) {
             // assume mod_rewrite
-            return rtrim(dirname($baseUrl), '/\\');
+            return rtrim(\dirname($baseUrl), '/\\');
         }
 
         return $baseUrl;
diff --git a/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php b/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
index d5a08ea8fa89..dd300a30ad18 100644
--- a/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
+++ b/src/Symfony/Component/HttpFoundation/BinaryFileResponse.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpFoundation;
 
-use Symfony\Component\HttpFoundation\File\File;
 use Symfony\Component\HttpFoundation\File\Exception\FileException;
+use Symfony\Component\HttpFoundation\File\File;
 
 /**
  * BinaryFileResponse represents an HTTP response delivering a file.
@@ -165,7 +165,7 @@ public function setContentDisposition($disposition, $filename = '', $filenameFal
             for ($i = 0, $filenameLength = mb_strlen($filename, $encoding); $i < $filenameLength; ++$i) {
                 $char = mb_substr($filename, $i, 1, $encoding);
 
-                if ('%' === $char || ord($char) < 32 || ord($char) > 126) {
+                if ('%' === $char || \ord($char) < 32 || \ord($char) > 126) {
                     $filenameFallback .= '_';
                 } else {
                     $filenameFallback .= $char;
@@ -221,12 +221,12 @@ public function prepare(Request $request)
                 foreach (explode(',', $request->headers->get('X-Accel-Mapping', '')) as $mapping) {
                     $mapping = explode('=', $mapping, 2);
 
-                    if (2 === count($mapping)) {
+                    if (2 === \count($mapping)) {
                         $pathPrefix = trim($mapping[0]);
                         $location = trim($mapping[1]);
 
-                        if (substr($path, 0, strlen($pathPrefix)) === $pathPrefix) {
-                            $path = $location.substr($path, strlen($pathPrefix));
+                        if (substr($path, 0, \strlen($pathPrefix)) === $pathPrefix) {
+                            $path = $location.substr($path, \strlen($pathPrefix));
                             break;
                         }
                     }
diff --git a/src/Symfony/Component/HttpFoundation/CHANGELOG.md b/src/Symfony/Component/HttpFoundation/CHANGELOG.md
index 5b90113d51ea..7ddf94f95ae3 100644
--- a/src/Symfony/Component/HttpFoundation/CHANGELOG.md
+++ b/src/Symfony/Component/HttpFoundation/CHANGELOG.md
@@ -1,6 +1,12 @@
 CHANGELOG
 =========
 
+4.0.14
+------
+
+ * [BC BREAK] Support for the IIS-only `X_ORIGINAL_URL` and `X_REWRITE_URL`
+   HTTP headers has been dropped for security reasons.
+
 4.0.0
 -----
 
diff --git a/src/Symfony/Component/HttpFoundation/Cookie.php b/src/Symfony/Component/HttpFoundation/Cookie.php
index cc9de5adf7fc..4962e1de37ee 100644
--- a/src/Symfony/Component/HttpFoundation/Cookie.php
+++ b/src/Symfony/Component/HttpFoundation/Cookie.php
@@ -128,7 +128,7 @@ public function __construct(string $name, string $value = null, $expire = 0, ?st
             $sameSite = strtolower($sameSite);
         }
 
-        if (!in_array($sameSite, array(self::SAMESITE_LAX, self::SAMESITE_STRICT, null), true)) {
+        if (!\in_array($sameSite, array(self::SAMESITE_LAX, self::SAMESITE_STRICT, null), true)) {
             throw new \InvalidArgumentException('The "sameSite" parameter value is not valid.');
         }
 
@@ -266,7 +266,7 @@ public function isHttpOnly()
      */
     public function isCleared()
     {
-        return $this->expire < time();
+        return 0 !== $this->expire && $this->expire < time();
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/File/Exception/UnexpectedTypeException.php b/src/Symfony/Component/HttpFoundation/File/Exception/UnexpectedTypeException.php
index 82e6691fff89..82b982b37898 100644
--- a/src/Symfony/Component/HttpFoundation/File/Exception/UnexpectedTypeException.php
+++ b/src/Symfony/Component/HttpFoundation/File/Exception/UnexpectedTypeException.php
@@ -15,6 +15,6 @@ class UnexpectedTypeException extends FileException
 {
     public function __construct($value, string $expectedType)
     {
-        parent::__construct(sprintf('Expected argument of type %s, %s given', $expectedType, is_object($value) ? get_class($value) : gettype($value)));
+        parent::__construct(sprintf('Expected argument of type %s, %s given', $expectedType, \is_object($value) ? \get_class($value) : \gettype($value)));
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/File/File.php b/src/Symfony/Component/HttpFoundation/File/File.php
index 44ac3925114a..de7b0809734a 100644
--- a/src/Symfony/Component/HttpFoundation/File/File.php
+++ b/src/Symfony/Component/HttpFoundation/File/File.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\HttpFoundation\File\Exception\FileException;
 use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
-use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser;
 use Symfony\Component\HttpFoundation\File\MimeType\ExtensionGuesser;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser;
 
 /**
  * A file in the file system.
@@ -115,7 +115,7 @@ protected function getTargetFile($directory, $name = null)
             throw new FileException(sprintf('Unable to write in the "%s" directory', $directory));
         }
 
-        $target = rtrim($directory, '/\\').DIRECTORY_SEPARATOR.(null === $name ? $this->getBasename() : $this->getName($name));
+        $target = rtrim($directory, '/\\').\DIRECTORY_SEPARATOR.(null === $name ? $this->getBasename() : $this->getName($name));
 
         return new self($target, false);
     }
diff --git a/src/Symfony/Component/HttpFoundation/File/MimeType/FileBinaryMimeTypeGuesser.php b/src/Symfony/Component/HttpFoundation/File/MimeType/FileBinaryMimeTypeGuesser.php
index 83be44af67d2..313000195d51 100644
--- a/src/Symfony/Component/HttpFoundation/File/MimeType/FileBinaryMimeTypeGuesser.php
+++ b/src/Symfony/Component/HttpFoundation/File/MimeType/FileBinaryMimeTypeGuesser.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpFoundation\File\MimeType;
 
-use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;
+use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 
 /**
  * Guesses the mime type with the binary "file" (only available on *nix).
@@ -49,7 +49,7 @@ public static function isSupported()
             return $supported;
         }
 
-        if ('\\' === DIRECTORY_SEPARATOR || !function_exists('passthru') || !function_exists('escapeshellarg')) {
+        if ('\\' === \DIRECTORY_SEPARATOR || !\function_exists('passthru') || !\function_exists('escapeshellarg')) {
             return $supported = false;
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/File/MimeType/FileinfoMimeTypeGuesser.php b/src/Symfony/Component/HttpFoundation/File/MimeType/FileinfoMimeTypeGuesser.php
index d3ba8b31b5eb..cee9ef3f7223 100644
--- a/src/Symfony/Component/HttpFoundation/File/MimeType/FileinfoMimeTypeGuesser.php
+++ b/src/Symfony/Component/HttpFoundation/File/MimeType/FileinfoMimeTypeGuesser.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpFoundation\File\MimeType;
 
-use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;
+use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 
 /**
  * Guesses the mime type using the PECL extension FileInfo.
@@ -40,7 +40,7 @@ public function __construct(string $magicFile = null)
      */
     public static function isSupported()
     {
-        return function_exists('finfo_open');
+        return \function_exists('finfo_open');
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesser.php b/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesser.php
index d78c76068234..dae47a7c023d 100644
--- a/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesser.php
+++ b/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesser.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpFoundation\File\MimeType;
 
-use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;
+use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 
 /**
  * A singleton mime type guesser.
diff --git a/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesserInterface.php b/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesserInterface.php
index f8c3ad2289cc..5ac1acb82324 100644
--- a/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesserInterface.php
+++ b/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesserInterface.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpFoundation\File\MimeType;
 
-use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;
+use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 
 /**
  * Guesses the mime type of a file.
diff --git a/src/Symfony/Component/HttpFoundation/File/UploadedFile.php b/src/Symfony/Component/HttpFoundation/File/UploadedFile.php
index e234537cb22d..c2e133345876 100644
--- a/src/Symfony/Component/HttpFoundation/File/UploadedFile.php
+++ b/src/Symfony/Component/HttpFoundation/File/UploadedFile.php
@@ -222,9 +222,9 @@ public static function getMaxFilesize()
 
         $max = ltrim($iniMax, '+');
         if (0 === strpos($max, '0x')) {
-            $max = intval($max, 16);
+            $max = \intval($max, 16);
         } elseif (0 === strpos($max, '0')) {
-            $max = intval($max, 8);
+            $max = \intval($max, 8);
         } else {
             $max = (int) $max;
         }
diff --git a/src/Symfony/Component/HttpFoundation/FileBag.php b/src/Symfony/Component/HttpFoundation/FileBag.php
index 5edd0e6210c5..c135ad641248 100644
--- a/src/Symfony/Component/HttpFoundation/FileBag.php
+++ b/src/Symfony/Component/HttpFoundation/FileBag.php
@@ -45,7 +45,7 @@ public function replace(array $files = array())
      */
     public function set($key, $value)
     {
-        if (!is_array($value) && !$value instanceof UploadedFile) {
+        if (!\is_array($value) && !$value instanceof UploadedFile) {
             throw new \InvalidArgumentException('An uploaded file must be an array or an instance of UploadedFile.');
         }
 
@@ -76,7 +76,7 @@ protected function convertFileInformation($file)
         }
 
         $file = $this->fixPhpFilesArray($file);
-        if (is_array($file)) {
+        if (\is_array($file)) {
             $keys = array_keys($file);
             sort($keys);
 
@@ -113,14 +113,14 @@ protected function convertFileInformation($file)
      */
     protected function fixPhpFilesArray($data)
     {
-        if (!is_array($data)) {
+        if (!\is_array($data)) {
             return $data;
         }
 
         $keys = array_keys($data);
         sort($keys);
 
-        if (self::$fileKeys != $keys || !isset($data['name']) || !is_array($data['name'])) {
+        if (self::$fileKeys != $keys || !isset($data['name']) || !\is_array($data['name'])) {
             return $data;
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/HeaderBag.php b/src/Symfony/Component/HttpFoundation/HeaderBag.php
index 375fcf590e97..dc271eb7a8f6 100644
--- a/src/Symfony/Component/HttpFoundation/HeaderBag.php
+++ b/src/Symfony/Component/HttpFoundation/HeaderBag.php
@@ -181,7 +181,7 @@ public function has($key)
      */
     public function contains($key, $value)
     {
-        return in_array($value, $this->get($key, null, false));
+        return \in_array($value, $this->get($key, null, false));
     }
 
     /**
@@ -289,7 +289,7 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->headers);
+        return \count($this->headers);
     }
 
     protected function getCacheControlHeader()
diff --git a/src/Symfony/Component/HttpFoundation/IpUtils.php b/src/Symfony/Component/HttpFoundation/IpUtils.php
index 86d135b2d3af..a1bfa90885dc 100644
--- a/src/Symfony/Component/HttpFoundation/IpUtils.php
+++ b/src/Symfony/Component/HttpFoundation/IpUtils.php
@@ -37,7 +37,7 @@ private function __construct()
      */
     public static function checkIp($requestIp, $ips)
     {
-        if (!is_array($ips)) {
+        if (!\is_array($ips)) {
             $ips = array($ips);
         }
 
@@ -116,7 +116,7 @@ public static function checkIp6($requestIp, $ip)
             return self::$checkedIps[$cacheKey];
         }
 
-        if (!((extension_loaded('sockets') && defined('AF_INET6')) || @inet_pton('::1'))) {
+        if (!((\extension_loaded('sockets') && \defined('AF_INET6')) || @inet_pton('::1'))) {
             throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/JsonResponse.php b/src/Symfony/Component/HttpFoundation/JsonResponse.php
index 729264029097..f10262e88e76 100644
--- a/src/Symfony/Component/HttpFoundation/JsonResponse.php
+++ b/src/Symfony/Component/HttpFoundation/JsonResponse.php
@@ -101,7 +101,7 @@ public function setCallback($callback = null)
             );
             $parts = explode('.', $callback);
             foreach ($parts as $part) {
-                if (!preg_match($pattern, $part) || in_array($part, $reserved, true)) {
+                if (!preg_match($pattern, $part) || \in_array($part, $reserved, true)) {
                     throw new \InvalidArgumentException('The callback name is not valid.');
                 }
             }
@@ -142,7 +142,7 @@ public function setData($data = array())
         try {
             $data = json_encode($data, $this->encodingOptions);
         } catch (\Exception $e) {
-            if ('Exception' === get_class($e) && 0 === strpos($e->getMessage(), 'Failed calling ')) {
+            if ('Exception' === \get_class($e) && 0 === strpos($e->getMessage(), 'Failed calling ')) {
                 throw $e->getPrevious() ?: $e;
             }
             throw $e;
diff --git a/src/Symfony/Component/HttpFoundation/ParameterBag.php b/src/Symfony/Component/HttpFoundation/ParameterBag.php
index 257ef8bceaa4..e3be0a9b8b22 100644
--- a/src/Symfony/Component/HttpFoundation/ParameterBag.php
+++ b/src/Symfony/Component/HttpFoundation/ParameterBag.php
@@ -200,12 +200,12 @@ public function filter($key, $default = null, $filter = FILTER_DEFAULT, $options
         $value = $this->get($key, $default);
 
         // Always turn $options into an array - this allows filter_var option shortcuts.
-        if (!is_array($options) && $options) {
+        if (!\is_array($options) && $options) {
             $options = array('flags' => $options);
         }
 
         // Add a convenience check for arrays.
-        if (is_array($value) && !isset($options['flags'])) {
+        if (\is_array($value) && !isset($options['flags'])) {
             $options['flags'] = FILTER_REQUIRE_ARRAY;
         }
 
@@ -229,6 +229,6 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->parameters);
+        return \count($this->parameters);
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index d2ae92c88a48..458a3cf70c74 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -281,7 +281,7 @@ public static function createFromGlobals()
         $request = self::createRequestFromFactory($_GET, $_POST, array(), $_COOKIE, $_FILES, $_SERVER);
 
         if (0 === strpos($request->headers->get('CONTENT_TYPE'), 'application/x-www-form-urlencoded')
-            && in_array(strtoupper($request->server->get('REQUEST_METHOD', 'GET')), array('PUT', 'DELETE', 'PATCH'))
+            && \in_array(strtoupper($request->server->get('REQUEST_METHOD', 'GET')), array('PUT', 'DELETE', 'PATCH'))
         ) {
             parse_str($request->getContent(), $data);
             $request->request = new ParameterBag($data);
@@ -533,7 +533,7 @@ public function overrideGlobals()
 
         foreach ($this->headers->all() as $key => $value) {
             $key = strtoupper(str_replace('-', '_', $key));
-            if (in_array($key, array('CONTENT_TYPE', 'CONTENT_LENGTH'))) {
+            if (\in_array($key, array('CONTENT_TYPE', 'CONTENT_LENGTH'))) {
                 $_SERVER[$key] = implode(', ', $value);
             } else {
                 $_SERVER['HTTP_'.$key] = implode(', ', $value);
@@ -1075,7 +1075,7 @@ public function getRelativeUriForPath($path)
         }
 
         $targetDirs[] = $targetFile;
-        $path = str_repeat('../', count($sourceDirs)).implode('/', $targetDirs);
+        $path = str_repeat('../', \count($sourceDirs)).implode('/', $targetDirs);
 
         // A reference to the same base directory or an empty subdirectory must be prefixed with "./".
         // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
@@ -1114,7 +1114,7 @@ public function getQueryString()
     public function isSecure()
     {
         if ($this->isFromTrustedProxy() && $proto = $this->getTrustedValues(self::HEADER_X_FORWARDED_PROTO)) {
-            return in_array(strtolower($proto[0]), array('https', 'on', 'ssl', '1'), true);
+            return \in_array(strtolower($proto[0]), array('https', 'on', 'ssl', '1'), true);
         }
 
         $https = $this->server->get('HTTPS');
@@ -1160,10 +1160,10 @@ public function getHost()
             throw new SuspiciousOperationException(sprintf('Invalid Host "%s".', $host));
         }
 
-        if (count(self::$trustedHostPatterns) > 0) {
+        if (\count(self::$trustedHostPatterns) > 0) {
             // to avoid host header injection attacks, you should provide a list of trusted host patterns
 
-            if (in_array($host, self::$trustedHosts)) {
+            if (\in_array($host, self::$trustedHosts)) {
                 return $host;
             }
 
@@ -1221,7 +1221,10 @@ public function getMethod()
                 if ($method = $this->headers->get('X-HTTP-METHOD-OVERRIDE')) {
                     $this->method = strtoupper($method);
                 } elseif (self::$httpMethodParameterOverride) {
-                    $this->method = strtoupper($this->request->get('_method', $this->query->get('_method', 'POST')));
+                    $method = $this->request->get('_method', $this->query->get('_method', 'POST'));
+                    if (\is_string($method)) {
+                        $this->method = strtoupper($method);
+                    }
                 }
             }
         }
@@ -1292,10 +1295,10 @@ public function getFormat($mimeType)
         }
 
         foreach (static::$formats as $format => $mimeTypes) {
-            if (in_array($mimeType, (array) $mimeTypes)) {
+            if (\in_array($mimeType, (array) $mimeTypes)) {
                 return $format;
             }
-            if (null !== $canonicalMimeType && in_array($canonicalMimeType, (array) $mimeTypes)) {
+            if (null !== $canonicalMimeType && \in_array($canonicalMimeType, (array) $mimeTypes)) {
                 return $format;
             }
         }
@@ -1313,7 +1316,7 @@ public function setFormat($format, $mimeTypes)
             static::initializeFormats();
         }
 
-        static::$formats[$format] = is_array($mimeTypes) ? $mimeTypes : array($mimeTypes);
+        static::$formats[$format] = \is_array($mimeTypes) ? $mimeTypes : array($mimeTypes);
     }
 
     /**
@@ -1425,12 +1428,12 @@ public function isMethod($method)
      */
     public function isMethodSafe(/* $andCacheable = true */)
     {
-        if (!func_num_args() || func_get_arg(0)) {
+        if (!\func_num_args() || func_get_arg(0)) {
             // setting $andCacheable to false should be deprecated in 4.1
             throw new \BadMethodCallException('Checking only for cacheable HTTP methods with Symfony\Component\HttpFoundation\Request::isMethodSafe() is not supported.');
         }
 
-        return in_array($this->getMethod(), array('GET', 'HEAD', 'OPTIONS', 'TRACE'));
+        return \in_array($this->getMethod(), array('GET', 'HEAD', 'OPTIONS', 'TRACE'));
     }
 
     /**
@@ -1440,7 +1443,7 @@ public function isMethodSafe(/* $andCacheable = true */)
      */
     public function isMethodIdempotent()
     {
-        return in_array($this->getMethod(), array('HEAD', 'GET', 'PUT', 'DELETE', 'TRACE', 'OPTIONS', 'PURGE'));
+        return \in_array($this->getMethod(), array('HEAD', 'GET', 'PUT', 'DELETE', 'TRACE', 'OPTIONS', 'PURGE'));
     }
 
     /**
@@ -1452,7 +1455,7 @@ public function isMethodIdempotent()
      */
     public function isMethodCacheable()
     {
-        return in_array($this->getMethod(), array('GET', 'HEAD'));
+        return \in_array($this->getMethod(), array('GET', 'HEAD'));
     }
 
     /**
@@ -1490,7 +1493,7 @@ public function getProtocolVersion()
      */
     public function getContent($asResource = false)
     {
-        $currentContentIsResource = is_resource($this->content);
+        $currentContentIsResource = \is_resource($this->content);
 
         if (true === $asResource) {
             if ($currentContentIsResource) {
@@ -1500,7 +1503,7 @@ public function getContent($asResource = false)
             }
 
             // Content passed in parameter (test)
-            if (is_string($this->content)) {
+            if (\is_string($this->content)) {
                 $resource = fopen('php://temp', 'r+');
                 fwrite($resource, $this->content);
                 rewind($resource);
@@ -1568,7 +1571,7 @@ public function getPreferredLanguage(array $locales = null)
             $extendedPreferredLanguages[] = $language;
             if (false !== $position = strpos($language, '_')) {
                 $superLanguage = substr($language, 0, $position);
-                if (!in_array($superLanguage, $preferredLanguages)) {
+                if (!\in_array($superLanguage, $preferredLanguages)) {
                     $extendedPreferredLanguages[] = $superLanguage;
                 }
             }
@@ -1599,11 +1602,11 @@ public function getLanguages()
                     // Language not listed in ISO 639 that are not variants
                     // of any listed language, which can be registered with the
                     // i-prefix, such as i-cherokee
-                    if (count($codes) > 1) {
+                    if (\count($codes) > 1) {
                         $lang = $codes[1];
                     }
                 } else {
-                    for ($i = 0, $max = count($codes); $i < $max; ++$i) {
+                    for ($i = 0, $max = \count($codes); $i < $max; ++$i) {
                         if (0 === $i) {
                             $lang = strtolower($codes[0]);
                         } else {
@@ -1688,18 +1691,7 @@ protected function prepareRequestUri()
     {
         $requestUri = '';
 
-        if ($this->headers->has('X_ORIGINAL_URL')) {
-            // IIS with Microsoft Rewrite Module
-            $requestUri = $this->headers->get('X_ORIGINAL_URL');
-            $this->headers->remove('X_ORIGINAL_URL');
-            $this->server->remove('HTTP_X_ORIGINAL_URL');
-            $this->server->remove('UNENCODED_URL');
-            $this->server->remove('IIS_WasUrlRewritten');
-        } elseif ($this->headers->has('X_REWRITE_URL')) {
-            // IIS with ISAPI_Rewrite
-            $requestUri = $this->headers->get('X_REWRITE_URL');
-            $this->headers->remove('X_REWRITE_URL');
-        } elseif ('1' == $this->server->get('IIS_WasUrlRewritten') && '' != $this->server->get('UNENCODED_URL')) {
+        if ('1' == $this->server->get('IIS_WasUrlRewritten') && '' != $this->server->get('UNENCODED_URL')) {
             // IIS7 with URL Rewrite: make sure we get the unencoded URL (double slash problem)
             $requestUri = $this->server->get('UNENCODED_URL');
             $this->server->remove('UNENCODED_URL');
@@ -1709,7 +1701,7 @@ protected function prepareRequestUri()
             // HTTP proxy reqs setup request URI with scheme and host [and port] + the URL path, only use URL path
             $schemeAndHttpHost = $this->getSchemeAndHttpHost();
             if (0 === strpos($requestUri, $schemeAndHttpHost)) {
-                $requestUri = substr($requestUri, strlen($schemeAndHttpHost));
+                $requestUri = substr($requestUri, \strlen($schemeAndHttpHost));
             }
         } elseif ($this->server->has('ORIG_PATH_INFO')) {
             // IIS 5.0, PHP as CGI
@@ -1749,7 +1741,7 @@ protected function prepareBaseUrl()
             $segs = explode('/', trim($file, '/'));
             $segs = array_reverse($segs);
             $index = 0;
-            $last = count($segs);
+            $last = \count($segs);
             $baseUrl = '';
             do {
                 $seg = $segs[$index];
@@ -1769,9 +1761,9 @@ protected function prepareBaseUrl()
             return $prefix;
         }
 
-        if ($baseUrl && false !== $prefix = $this->getUrlencodedPrefix($requestUri, rtrim(dirname($baseUrl), '/'.DIRECTORY_SEPARATOR).'/')) {
+        if ($baseUrl && false !== $prefix = $this->getUrlencodedPrefix($requestUri, rtrim(\dirname($baseUrl), '/'.\DIRECTORY_SEPARATOR).'/')) {
             // directory portion of $baseUrl matches
-            return rtrim($prefix, '/'.DIRECTORY_SEPARATOR);
+            return rtrim($prefix, '/'.\DIRECTORY_SEPARATOR);
         }
 
         $truncatedRequestUri = $requestUri;
@@ -1788,11 +1780,11 @@ protected function prepareBaseUrl()
         // If using mod_rewrite or ISAPI_Rewrite strip the script filename
         // out of baseUrl. $pos !== 0 makes sure it is not matching a value
         // from PATH_INFO or QUERY_STRING
-        if (strlen($requestUri) >= strlen($baseUrl) && (false !== $pos = strpos($requestUri, $baseUrl)) && 0 !== $pos) {
-            $baseUrl = substr($requestUri, 0, $pos + strlen($baseUrl));
+        if (\strlen($requestUri) >= \strlen($baseUrl) && (false !== $pos = strpos($requestUri, $baseUrl)) && 0 !== $pos) {
+            $baseUrl = substr($requestUri, 0, $pos + \strlen($baseUrl));
         }
 
-        return rtrim($baseUrl, '/'.DIRECTORY_SEPARATOR);
+        return rtrim($baseUrl, '/'.\DIRECTORY_SEPARATOR);
     }
 
     /**
@@ -1809,12 +1801,12 @@ protected function prepareBasePath()
 
         $filename = basename($this->server->get('SCRIPT_FILENAME'));
         if (basename($baseUrl) === $filename) {
-            $basePath = dirname($baseUrl);
+            $basePath = \dirname($baseUrl);
         } else {
             $basePath = $baseUrl;
         }
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $basePath = str_replace('\\', '/', $basePath);
         }
 
@@ -1844,7 +1836,7 @@ protected function preparePathInfo()
             return $requestUri;
         }
 
-        $pathInfo = substr($requestUri, strlen($baseUrl));
+        $pathInfo = substr($requestUri, \strlen($baseUrl));
         if (false === $pathInfo || '' === $pathInfo) {
             // If substr() returns false then PATH_INFO is set to an empty string
             return '/';
@@ -1898,7 +1890,7 @@ private function getUrlencodedPrefix(string $string, string $prefix)
             return false;
         }
 
-        $len = strlen($prefix);
+        $len = \strlen($prefix);
 
         if (preg_match(sprintf('#^(%%[[:xdigit:]]{2}|.){%d}#', $len), $string, $match)) {
             return $match[0];
@@ -1910,7 +1902,7 @@ private function getUrlencodedPrefix(string $string, string $prefix)
     private static function createRequestFromFactory(array $query = array(), array $request = array(), array $attributes = array(), array $cookies = array(), array $files = array(), array $server = array(), $content = null)
     {
         if (self::$requestFactory) {
-            $request = call_user_func(self::$requestFactory, $query, $request, $attributes, $cookies, $files, $server, $content);
+            $request = \call_user_func(self::$requestFactory, $query, $request, $attributes, $cookies, $files, $server, $content);
 
             if (!$request instanceof self) {
                 throw new \LogicException('The Request factory must return an instance of Symfony\Component\HttpFoundation\Request.');
@@ -1949,6 +1941,11 @@ private function getTrustedValues($type, $ip = null)
         if ((self::$trustedHeaderSet & self::HEADER_FORWARDED) && $this->headers->has(self::$trustedHeaders[self::HEADER_FORWARDED])) {
             $forwardedValues = $this->headers->get(self::$trustedHeaders[self::HEADER_FORWARDED]);
             $forwardedValues = preg_match_all(sprintf('{(?:%s)=(?:"?\[?)([a-zA-Z0-9\.:_\-/]*+)}', self::$forwardedParams[$type]), $forwardedValues, $matches) ? $matches[1] : array();
+            if (self::HEADER_X_FORWARDED_PORT === $type) {
+                foreach ($forwardedValues as $k => $v) {
+                    $forwardedValues[$k] = substr_replace($v, '0.0.0.0', 0, strrpos($v, ':'));
+                }
+            }
         }
 
         if (null !== $ip) {
diff --git a/src/Symfony/Component/HttpFoundation/RequestMatcher.php b/src/Symfony/Component/HttpFoundation/RequestMatcher.php
index cc13f71af28a..57fa48e40be3 100644
--- a/src/Symfony/Component/HttpFoundation/RequestMatcher.php
+++ b/src/Symfony/Component/HttpFoundation/RequestMatcher.php
@@ -145,11 +145,11 @@ public function matchAttribute($key, $regexp)
      */
     public function matches(Request $request)
     {
-        if ($this->schemes && !in_array($request->getScheme(), $this->schemes, true)) {
+        if ($this->schemes && !\in_array($request->getScheme(), $this->schemes, true)) {
             return false;
         }
 
-        if ($this->methods && !in_array($request->getMethod(), $this->methods, true)) {
+        if ($this->methods && !\in_array($request->getMethod(), $this->methods, true)) {
             return false;
         }
 
@@ -173,6 +173,6 @@ public function matches(Request $request)
 
         // Note to future implementors: add additional checks above the
         // foreach above or else your check might not be run!
-        return 0 === count($this->ips);
+        return 0 === \count($this->ips);
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/RequestStack.php b/src/Symfony/Component/HttpFoundation/RequestStack.php
index 3d9cfd0c6419..40123f66f910 100644
--- a/src/Symfony/Component/HttpFoundation/RequestStack.php
+++ b/src/Symfony/Component/HttpFoundation/RequestStack.php
@@ -92,7 +92,7 @@ public function getMasterRequest()
      */
     public function getParentRequest()
     {
-        $pos = count($this->requests) - 2;
+        $pos = \count($this->requests) - 2;
 
         if (!isset($this->requests[$pos])) {
             return;
diff --git a/src/Symfony/Component/HttpFoundation/Response.php b/src/Symfony/Component/HttpFoundation/Response.php
index b7433173c7d9..07ef41339ca0 100644
--- a/src/Symfony/Component/HttpFoundation/Response.php
+++ b/src/Symfony/Component/HttpFoundation/Response.php
@@ -368,9 +368,9 @@ public function send()
         $this->sendHeaders();
         $this->sendContent();
 
-        if (function_exists('fastcgi_finish_request')) {
+        if (\function_exists('fastcgi_finish_request')) {
             fastcgi_finish_request();
-        } elseif (!\in_array(PHP_SAPI, array('cli', 'phpdbg'), true)) {
+        } elseif (!\in_array(\PHP_SAPI, array('cli', 'phpdbg'), true)) {
             static::closeOutputBuffers(0, true);
         }
 
@@ -390,8 +390,8 @@ public function send()
      */
     public function setContent($content)
     {
-        if (null !== $content && !is_string($content) && !is_numeric($content) && !is_callable(array($content, '__toString'))) {
-            throw new \UnexpectedValueException(sprintf('The Response content must be a string or object implementing __toString(), "%s" given.', gettype($content)));
+        if (null !== $content && !\is_string($content) && !is_numeric($content) && !\is_callable(array($content, '__toString'))) {
+            throw new \UnexpectedValueException(sprintf('The Response content must be a string or object implementing __toString(), "%s" given.', \gettype($content)));
         }
 
         $this->content = (string) $content;
@@ -522,7 +522,7 @@ public function getCharset(): ?string
      */
     public function isCacheable(): bool
     {
-        if (!in_array($this->statusCode, array(200, 203, 300, 301, 302, 404, 410))) {
+        if (!\in_array($this->statusCode, array(200, 203, 300, 301, 302, 404, 410))) {
             return false;
         }
 
@@ -1067,7 +1067,7 @@ public function isNotModified(Request $request): bool
         $modifiedSince = $request->headers->get('If-Modified-Since');
 
         if ($etags = $request->getETags()) {
-            $notModified = in_array($this->getEtag(), $etags) || in_array('*', $etags);
+            $notModified = \in_array($this->getEtag(), $etags) || \in_array('*', $etags);
         }
 
         if ($modifiedSince && $lastModified) {
@@ -1180,7 +1180,7 @@ public function isNotFound(): bool
      */
     public function isRedirect(string $location = null): bool
     {
-        return in_array($this->statusCode, array(201, 301, 302, 303, 307, 308)) && (null === $location ?: $location == $this->headers->get('Location'));
+        return \in_array($this->statusCode, array(201, 301, 302, 303, 307, 308)) && (null === $location ?: $location == $this->headers->get('Location'));
     }
 
     /**
@@ -1190,7 +1190,7 @@ public function isRedirect(string $location = null): bool
      */
     public function isEmpty(): bool
     {
-        return in_array($this->statusCode, array(204, 304));
+        return \in_array($this->statusCode, array(204, 304));
     }
 
     /**
@@ -1203,7 +1203,7 @@ public function isEmpty(): bool
     public static function closeOutputBuffers(int $targetLevel, bool $flush)
     {
         $status = ob_get_status(true);
-        $level = count($status);
+        $level = \count($status);
         $flags = PHP_OUTPUT_HANDLER_REMOVABLE | ($flush ? PHP_OUTPUT_HANDLER_FLUSHABLE : PHP_OUTPUT_HANDLER_CLEANABLE);
 
         while ($level-- > $targetLevel && ($s = $status[$level]) && (!isset($s['del']) ? !isset($s['flags']) || ($s['flags'] & $flags) === $flags : $s['del'])) {
diff --git a/src/Symfony/Component/HttpFoundation/ResponseHeaderBag.php b/src/Symfony/Component/HttpFoundation/ResponseHeaderBag.php
index e8a05ee68fbc..00cff7af0874 100644
--- a/src/Symfony/Component/HttpFoundation/ResponseHeaderBag.php
+++ b/src/Symfony/Component/HttpFoundation/ResponseHeaderBag.php
@@ -216,7 +216,7 @@ public function removeCookie($name, $path = '/', $domain = null)
      */
     public function getCookies($format = self::COOKIES_FLAT)
     {
-        if (!in_array($format, array(self::COOKIES_FLAT, self::COOKIES_ARRAY))) {
+        if (!\in_array($format, array(self::COOKIES_FLAT, self::COOKIES_ARRAY))) {
             throw new \InvalidArgumentException(sprintf('Format "%s" invalid (%s).', $format, implode(', ', array(self::COOKIES_FLAT, self::COOKIES_ARRAY))));
         }
 
@@ -267,7 +267,7 @@ public function clearCookie($name, $path = '/', $domain = null, $secure = false,
      */
     public function makeDisposition($disposition, $filename, $filenameFallback = '')
     {
-        if (!in_array($disposition, array(self::DISPOSITION_ATTACHMENT, self::DISPOSITION_INLINE))) {
+        if (!\in_array($disposition, array(self::DISPOSITION_ATTACHMENT, self::DISPOSITION_INLINE))) {
             throw new \InvalidArgumentException(sprintf('The disposition must be either "%s" or "%s".', self::DISPOSITION_ATTACHMENT, self::DISPOSITION_INLINE));
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/ServerBag.php b/src/Symfony/Component/HttpFoundation/ServerBag.php
index 19d2022ef7dd..d8ab561aafb1 100644
--- a/src/Symfony/Component/HttpFoundation/ServerBag.php
+++ b/src/Symfony/Component/HttpFoundation/ServerBag.php
@@ -68,7 +68,7 @@ public function getHeaders()
                 if (0 === stripos($authorizationHeader, 'basic ')) {
                     // Decode AUTHORIZATION header into PHP_AUTH_USER and PHP_AUTH_PW when authorization header is basic
                     $exploded = explode(':', base64_decode(substr($authorizationHeader, 6)), 2);
-                    if (2 == count($exploded)) {
+                    if (2 == \count($exploded)) {
                         list($headers['PHP_AUTH_USER'], $headers['PHP_AUTH_PW']) = $exploded;
                     }
                 } elseif (empty($this->parameters['PHP_AUTH_DIGEST']) && (0 === stripos($authorizationHeader, 'digest '))) {
diff --git a/src/Symfony/Component/HttpFoundation/Session/Attribute/AttributeBag.php b/src/Symfony/Component/HttpFoundation/Session/Attribute/AttributeBag.php
index 286534b8f2ed..82577b804ed5 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Attribute/AttributeBag.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Attribute/AttributeBag.php
@@ -143,6 +143,6 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->attributes);
+        return \count($this->attributes);
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Session/Attribute/NamespacedAttributeBag.php b/src/Symfony/Component/HttpFoundation/Session/Attribute/NamespacedAttributeBag.php
index dd7a7fad822f..50cd740d958b 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Attribute/NamespacedAttributeBag.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Attribute/NamespacedAttributeBag.php
@@ -110,7 +110,7 @@ protected function &resolveAttributePath($name, $writeContext = false)
         }
 
         $parts = explode($this->namespaceCharacter, $name);
-        if (count($parts) < 2) {
+        if (\count($parts) < 2) {
             if (!$writeContext) {
                 return $array;
             }
@@ -120,7 +120,7 @@ protected function &resolveAttributePath($name, $writeContext = false)
             return $array;
         }
 
-        unset($parts[count($parts) - 1]);
+        unset($parts[\count($parts) - 1]);
 
         foreach ($parts as $part) {
             if (null !== $array && !array_key_exists($part, $array)) {
diff --git a/src/Symfony/Component/HttpFoundation/Session/Session.php b/src/Symfony/Component/HttpFoundation/Session/Session.php
index c0978d552f19..8a33a9c3a725 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Session.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Session.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\HttpFoundation\Session;
 
-use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBagInterface;
 use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
 use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;
 use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;
+use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
@@ -138,7 +138,7 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->getAttributeBag()->all());
+        return \count($this->getAttributeBag()->all());
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php
index 1d3500a99590..b1465716cbb3 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php
@@ -119,7 +119,7 @@ public function destroy($sessionId)
     {
         if (!headers_sent() && ini_get('session.use_cookies')) {
             if (!$this->sessionName) {
-                throw new \LogicException(sprintf('Session name cannot be empty, did you forget to call "parent::open()" in "%s"?.', get_class($this)));
+                throw new \LogicException(sprintf('Session name cannot be empty, did you forget to call "parent::open()" in "%s"?.', \get_class($this)));
             }
             $sessionCookie = sprintf(' %s=', urlencode($this->sessionName));
             $sessionCookieWithId = sprintf('%s%s;', $sessionCookie, urlencode($sessionId));
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
index 0fd34dc1b65f..d1e451671525 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
@@ -178,7 +178,7 @@ public function __construct($pdoOrDsn = null, array $options = array())
 
             $this->pdo = $pdoOrDsn;
             $this->driver = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME);
-        } elseif (is_string($pdoOrDsn) && false !== strpos($pdoOrDsn, '://')) {
+        } elseif (\is_string($pdoOrDsn) && false !== strpos($pdoOrDsn, '://')) {
             $this->dsn = $this->buildDsnFromUrl($pdoOrDsn);
         } else {
             $this->dsn = $pdoOrDsn;
@@ -629,7 +629,7 @@ protected function doRead($sessionId)
                     return '';
                 }
 
-                return is_resource($sessionRows[0][0]) ? stream_get_contents($sessionRows[0][0]) : $sessionRows[0][0];
+                return \is_resource($sessionRows[0][0]) ? stream_get_contents($sessionRows[0][0]) : $sessionRows[0][0];
             }
 
             if (null !== $insertStmt) {
@@ -735,11 +735,11 @@ private function doAdvisoryLock(string $sessionId)
     private function convertStringToInt(string $string): int
     {
         if (4 === \PHP_INT_SIZE) {
-            return (ord($string[3]) << 24) + (ord($string[2]) << 16) + (ord($string[1]) << 8) + ord($string[0]);
+            return (\ord($string[3]) << 24) + (\ord($string[2]) << 16) + (\ord($string[1]) << 8) + \ord($string[0]);
         }
 
-        $int1 = (ord($string[7]) << 24) + (ord($string[6]) << 16) + (ord($string[5]) << 8) + ord($string[4]);
-        $int2 = (ord($string[3]) << 24) + (ord($string[2]) << 16) + (ord($string[1]) << 8) + ord($string[0]);
+        $int1 = (\ord($string[7]) << 24) + (\ord($string[6]) << 16) + (\ord($string[5]) << 8) + \ord($string[4]);
+        $int2 = (\ord($string[3]) << 24) + (\ord($string[2]) << 16) + (\ord($string[1]) << 8) + \ord($string[0]);
 
         return $int2 + ($int1 << 32);
     }
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/StrictSessionHandler.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/StrictSessionHandler.php
index 228119297d85..83a1f2c063c0 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/StrictSessionHandler.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/StrictSessionHandler.php
@@ -24,7 +24,7 @@ class StrictSessionHandler extends AbstractSessionHandler
     public function __construct(\SessionHandlerInterface $handler)
     {
         if ($handler instanceof \SessionUpdateTimestampHandlerInterface) {
-            throw new \LogicException(sprintf('"%s" is already an instance of "SessionUpdateTimestampHandlerInterface", you cannot wrap it with "%s".', get_class($handler), self::class));
+            throw new \LogicException(sprintf('"%s" is already an instance of "SessionUpdateTimestampHandlerInterface", you cannot wrap it with "%s".', \get_class($handler), self::class));
         }
 
         $this->handler = $handler;
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php b/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
index bfe13f05ed2e..bf54f19e3fe8 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
@@ -248,7 +248,7 @@ public function save()
                 $handler = $handler->getHandler();
             }
 
-            trigger_error(sprintf('session_write_close(): Failed to write session data with %s handler', get_class($handler)), E_USER_WARNING);
+            trigger_error(sprintf('session_write_close(): Failed to write session data with %s handler', \get_class($handler)), E_USER_WARNING);
         }
 
         $this->closed = true;
diff --git a/src/Symfony/Component/HttpFoundation/StreamedResponse.php b/src/Symfony/Component/HttpFoundation/StreamedResponse.php
index 2519f874ccec..6dba703d2811 100644
--- a/src/Symfony/Component/HttpFoundation/StreamedResponse.php
+++ b/src/Symfony/Component/HttpFoundation/StreamedResponse.php
@@ -111,7 +111,7 @@ public function sendContent()
             throw new \LogicException('The Response callback must not be null.');
         }
 
-        call_user_func($this->callback);
+        \call_user_func($this->callback);
 
         return $this;
     }
diff --git a/src/Symfony/Component/HttpFoundation/Tests/CookieTest.php b/src/Symfony/Component/HttpFoundation/Tests/CookieTest.php
index 5abb5814080f..3c7563addae9 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/CookieTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/CookieTest.php
@@ -154,6 +154,18 @@ public function testCookieIsCleared()
         $cookie = new Cookie('foo', 'bar', time() - 20);
 
         $this->assertTrue($cookie->isCleared(), '->isCleared() returns true if the cookie has expired');
+
+        $cookie = new Cookie('foo', 'bar');
+
+        $this->assertFalse($cookie->isCleared());
+
+        $cookie = new Cookie('foo', 'bar', 0);
+
+        $this->assertFalse($cookie->isCleared());
+
+        $cookie = new Cookie('foo', 'bar', -1);
+
+        $this->assertFalse($cookie->isCleared());
     }
 
     public function testToString()
diff --git a/src/Symfony/Component/HttpFoundation/Tests/File/MimeType/MimeTypeTest.php b/src/Symfony/Component/HttpFoundation/Tests/File/MimeType/MimeTypeTest.php
index b3f1f026a558..bb88807ab051 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/File/MimeType/MimeTypeTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/File/MimeType/MimeTypeTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpFoundation\Tests\File\MimeType;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser;
 use Symfony\Component\HttpFoundation\File\MimeType\FileBinaryMimeTypeGuesser;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser;
 
 /**
  * @requires extension fileinfo
@@ -59,7 +59,7 @@ public function testGuessWithIncorrectPath()
 
     public function testGuessWithNonReadablePath()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Can not verify chmod operations on Windows');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/File/UploadedFileTest.php b/src/Symfony/Component/HttpFoundation/Tests/File/UploadedFileTest.php
index 36f122fe7922..1a88d483505b 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/File/UploadedFileTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/File/UploadedFileTest.php
@@ -46,7 +46,7 @@ public function testFileUploadsWithNoMimeType()
 
         $this->assertEquals('application/octet-stream', $file->getClientMimeType());
 
-        if (extension_loaded('fileinfo')) {
+        if (\extension_loaded('fileinfo')) {
             $this->assertEquals('image/gif', $file->getMimeType());
         }
     }
diff --git a/src/Symfony/Component/HttpFoundation/Tests/HeaderBagTest.php b/src/Symfony/Component/HttpFoundation/Tests/HeaderBagTest.php
index 6d19ceb009f2..c5a437f99937 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/HeaderBagTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/HeaderBagTest.php
@@ -192,7 +192,7 @@ public function testGetIterator()
             $this->assertEquals(array($headers[$key]), $val);
         }
 
-        $this->assertEquals(count($headers), $i);
+        $this->assertEquals(\count($headers), $i);
     }
 
     public function testCount()
@@ -200,6 +200,6 @@ public function testCount()
         $headers = array('foo' => 'bar', 'HELLO' => 'WORLD');
         $headerBag = new HeaderBag($headers);
 
-        $this->assertCount(count($headers), $headerBag);
+        $this->assertCount(\count($headers), $headerBag);
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php b/src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
index 7a93f9947262..232a2040ff63 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
@@ -47,7 +47,7 @@ public function getIpv4Data()
      */
     public function testIpv6($matches, $remoteAddr, $cidr)
     {
-        if (!defined('AF_INET6')) {
+        if (!\defined('AF_INET6')) {
             $this->markTestSkipped('Only works when PHP is compiled without the option "disable-ipv6".');
         }
 
@@ -78,7 +78,7 @@ public function getIpv6Data()
      */
     public function testAnIpv6WithOptionDisabledIpv6()
     {
-        if (defined('AF_INET6')) {
+        if (\defined('AF_INET6')) {
             $this->markTestSkipped('Only works when PHP is compiled with the option "disable-ipv6".');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/ParameterBagTest.php b/src/Symfony/Component/HttpFoundation/Tests/ParameterBagTest.php
index ab908d8d37de..dccfd4f30868 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/ParameterBagTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/ParameterBagTest.php
@@ -171,7 +171,7 @@ public function testGetIterator()
             $this->assertEquals($parameters[$key], $val);
         }
 
-        $this->assertEquals(count($parameters), $i);
+        $this->assertEquals(\count($parameters), $i);
     }
 
     public function testCount()
@@ -179,7 +179,7 @@ public function testCount()
         $parameters = array('foo' => 'bar', 'hello' => 'world');
         $bag = new ParameterBag($parameters);
 
-        $this->assertCount(count($parameters), $bag);
+        $this->assertCount(\count($parameters), $bag);
     }
 
     public function testGetBoolean()
diff --git a/src/Symfony/Component/HttpFoundation/Tests/RequestMatcherTest.php b/src/Symfony/Component/HttpFoundation/Tests/RequestMatcherTest.php
index b5d80048ff11..10d764a776bb 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/RequestMatcherTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/RequestMatcherTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpFoundation\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\RequestMatcher;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestMatcher;
 
 class RequestMatcherTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
index bc76b2d41519..38699efe9a02 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
-use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
-use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Session\Session;
+use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
 
 class RequestTest extends TestCase
 {
@@ -848,6 +848,11 @@ public function testGetSetMethod()
         $request->setMethod('POST');
         $request->headers->set('X-HTTP-METHOD-OVERRIDE', 'delete');
         $this->assertEquals('DELETE', $request->getMethod(), '->getMethod() returns the method from X-HTTP-Method-Override if defined and POST');
+
+        $request = new Request();
+        $request->setMethod('POST');
+        $request->query->set('_method', array('delete', 'patch'));
+        $this->assertSame('POST', $request->getMethod(), '->getMethod() returns the request method if invalid type is defined in query');
     }
 
     /**
@@ -1817,52 +1822,8 @@ public function iisRequestUriProvider()
     {
         return array(
             array(
-                array(
-                    'X_ORIGINAL_URL' => '/foo/bar',
-                ),
-                array(),
-                '/foo/bar',
-            ),
-            array(
-                array(
-                    'X_REWRITE_URL' => '/foo/bar',
-                ),
                 array(),
-                '/foo/bar',
-            ),
-            array(
-                array(),
-                array(
-                    'IIS_WasUrlRewritten' => '1',
-                    'UNENCODED_URL' => '/foo/bar',
-                ),
-                '/foo/bar',
-            ),
-            array(
-                array(
-                    'X_ORIGINAL_URL' => '/foo/bar',
-                ),
-                array(
-                    'HTTP_X_ORIGINAL_URL' => '/foo/bar',
-                ),
-                '/foo/bar',
-            ),
-            array(
-                array(
-                    'X_ORIGINAL_URL' => '/foo/bar',
-                ),
-                array(
-                    'IIS_WasUrlRewritten' => '1',
-                    'UNENCODED_URL' => '/foo/bar',
-                ),
-                '/foo/bar',
-            ),
-            array(
-                array(
-                    'X_ORIGINAL_URL' => '/foo/bar',
-                ),
                 array(
-                    'HTTP_X_ORIGINAL_URL' => '/foo/bar',
                     'IIS_WasUrlRewritten' => '1',
                     'UNENCODED_URL' => '/foo/bar',
                 ),
diff --git a/src/Symfony/Component/HttpFoundation/Tests/ResponseHeaderBagTest.php b/src/Symfony/Component/HttpFoundation/Tests/ResponseHeaderBagTest.php
index 7b5e720afdb6..06e2d41d01bb 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/ResponseHeaderBagTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/ResponseHeaderBagTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpFoundation\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\ResponseHeaderBag;
 use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpFoundation\ResponseHeaderBag;
 
 /**
  * @group time-sensitive
diff --git a/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php b/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
index a51b954fa0bd..29cf71240dc0 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
@@ -974,7 +974,7 @@ protected function provideResponse()
      */
     public function ianaCodesReasonPhrasesProvider()
     {
-        if (!in_array('https', stream_get_wrappers(), true)) {
+        if (!\in_array('https', stream_get_wrappers(), true)) {
             $this->markTestSkipped('The "https" wrapper is not available');
         }
 
@@ -1002,7 +1002,7 @@ public function ianaCodesReasonPhrasesProvider()
             $value = $xpath->query('.//ns:value', $record)->item(0)->nodeValue;
             $description = $xpath->query('.//ns:description', $record)->item(0)->nodeValue;
 
-            if (in_array($description, array('Unassigned', '(Unused)'), true)) {
+            if (\in_array($description, array('Unassigned', '(Unused)'), true)) {
                 continue;
             }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Attribute/AttributeBagTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Attribute/AttributeBagTest.php
index 724a0b984470..43644e23eab2 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Attribute/AttributeBagTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Attribute/AttributeBagTest.php
@@ -176,11 +176,11 @@ public function testGetIterator()
             ++$i;
         }
 
-        $this->assertEquals(count($this->array), $i);
+        $this->assertEquals(\count($this->array), $i);
     }
 
     public function testCount()
     {
-        $this->assertCount(count($this->array), $this->bag);
+        $this->assertCount(\count($this->array), $this->bag);
     }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/SessionTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/SessionTest.php
index 41720e4b6fc4..37d722660fbc 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/SessionTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/SessionTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpFoundation\Tests\Session;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\Session\Session;
-use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
+use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
+use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
 
 /**
@@ -206,7 +206,7 @@ public function testGetIterator()
             ++$i;
         }
 
-        $this->assertEquals(count($attributes), $i);
+        $this->assertEquals(\count($attributes), $i);
     }
 
     public function testGetCount()
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NullSessionHandlerTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NullSessionHandlerTest.php
index 718fd0f830e4..9a2212b8b400 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NullSessionHandlerTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NullSessionHandlerTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpFoundation\Tests\Session\Storage\Handler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Session\Storage\Handler\NullSessionHandler;
 use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;
-use Symfony\Component\HttpFoundation\Session\Session;
 
 /**
  * Test class for NullSessionHandler.
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/PdoSessionHandlerTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/PdoSessionHandlerTest.php
index d9d0efe94134..e84781898bb2 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/PdoSessionHandlerTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/PdoSessionHandlerTest.php
@@ -389,8 +389,8 @@ public function getAttribute($attribute)
 
     public function prepare($statement, $driverOptions = array())
     {
-        return is_callable($this->prepareResult)
-            ? call_user_func($this->prepareResult, $statement, $driverOptions)
+        return \is_callable($this->prepareResult)
+            ? \call_user_func($this->prepareResult, $statement, $driverOptions)
             : $this->prepareResult;
     }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MockArraySessionStorageTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MockArraySessionStorageTest.php
index 82df5543eb54..0c182e0b0bf5 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MockArraySessionStorageTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MockArraySessionStorageTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpFoundation\Tests\Session\Storage;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
 use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
+use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
 
 /**
  * Test class for MockArraySessionStorage.
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MockFileSessionStorageTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MockFileSessionStorageTest.php
index 53accd38447d..16957981750e 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MockFileSessionStorageTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/MockFileSessionStorageTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpFoundation\Tests\Session\Storage;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\Session\Storage\MockFileSessionStorage;
-use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
+use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
+use Symfony\Component\HttpFoundation\Session\Storage\MockFileSessionStorage;
 
 /**
  * Test class for MockFileSessionStorage.
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/NativeSessionStorageTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/NativeSessionStorageTest.php
index 382707b0c399..52da2947cbcb 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/NativeSessionStorageTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/NativeSessionStorageTest.php
@@ -184,7 +184,7 @@ public function testCookieOptions()
 
     public function testSessionOptions()
     {
-        if (defined('HHVM_VERSION')) {
+        if (\defined('HHVM_VERSION')) {
             $this->markTestSkipped('HHVM is not handled in this test case.');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/PhpBridgeSessionStorageTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/PhpBridgeSessionStorageTest.php
index 0b3b7e141e0f..303f36d34843 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/PhpBridgeSessionStorageTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/PhpBridgeSessionStorageTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpFoundation\Tests\Session\Storage;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\Session\Storage\PhpBridgeSessionStorage;
 use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
+use Symfony\Component\HttpFoundation\Session\Storage\PhpBridgeSessionStorage;
 
 /**
  * Test class for PhpSessionStorage.
diff --git a/src/Symfony/Component/HttpKernel/Bundle/Bundle.php b/src/Symfony/Component/HttpKernel/Bundle/Bundle.php
index 46a0c893d8df..23e093373d6d 100644
--- a/src/Symfony/Component/HttpKernel/Bundle/Bundle.php
+++ b/src/Symfony/Component/HttpKernel/Bundle/Bundle.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\HttpKernel\Bundle;
 
+use Symfony\Component\Console\Application;
+use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Container;
-use Symfony\Component\Console\Application;
 use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
 
 /**
@@ -72,7 +72,7 @@ public function getContainerExtension()
 
             if (null !== $extension) {
                 if (!$extension instanceof ExtensionInterface) {
-                    throw new \LogicException(sprintf('Extension %s must implement Symfony\Component\DependencyInjection\Extension\ExtensionInterface.', get_class($extension)));
+                    throw new \LogicException(sprintf('Extension %s must implement Symfony\Component\DependencyInjection\Extension\ExtensionInterface.', \get_class($extension)));
                 }
 
                 // check naming convention
@@ -120,7 +120,7 @@ public function getPath()
     {
         if (null === $this->path) {
             $reflected = new \ReflectionObject($this);
-            $this->path = dirname($reflected->getFileName());
+            $this->path = \dirname($reflected->getFileName());
         }
 
         return $this->path;
diff --git a/src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmer.php b/src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmer.php
index dba35a639a46..52dc2ad2c3d8 100644
--- a/src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmer.php
+++ b/src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmer.php
@@ -20,7 +20,7 @@ abstract class CacheWarmer implements CacheWarmerInterface
 {
     protected function writeCacheFile($file, $content)
     {
-        $tmpFile = @tempnam(dirname($file), basename($file));
+        $tmpFile = @tempnam(\dirname($file), basename($file));
         if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $file)) {
             @chmod($file, 0666 & ~umask());
 
diff --git a/src/Symfony/Component/HttpKernel/Client.php b/src/Symfony/Component/HttpKernel/Client.php
index 7979722d164f..380dd152436a 100644
--- a/src/Symfony/Component/HttpKernel/Client.php
+++ b/src/Symfony/Component/HttpKernel/Client.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\HttpKernel;
 
 use Symfony\Component\BrowserKit\Client as BaseClient;
+use Symfony\Component\BrowserKit\CookieJar;
+use Symfony\Component\BrowserKit\History;
 use Symfony\Component\BrowserKit\Request as DomRequest;
 use Symfony\Component\BrowserKit\Response as DomResponse;
-use Symfony\Component\BrowserKit\History;
-use Symfony\Component\BrowserKit\CookieJar;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -89,7 +89,7 @@ protected function getScript($request)
         foreach (get_declared_classes() as $class) {
             if (0 === strpos($class, 'ComposerAutoloaderInit')) {
                 $r = new \ReflectionClass($class);
-                $file = dirname(dirname($r->getFileName())).'/autoload.php';
+                $file = \dirname(\dirname($r->getFileName())).'/autoload.php';
                 if (file_exists($file)) {
                     $requires .= "require_once '".str_replace("'", "\\'", $file)."';\n";
                 }
@@ -160,7 +160,7 @@ protected function filterFiles(array $files)
     {
         $filtered = array();
         foreach ($files as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $filtered[$key] = $this->filterFiles($value);
             } elseif ($value instanceof UploadedFile) {
                 if ($value->isValid() && $value->getSize() > UploadedFile::getMaxFilesize()) {
diff --git a/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver.php b/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver.php
index 186007ebe49c..142a6d54a6e5 100644
--- a/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver.php
@@ -56,7 +56,7 @@ public function getArguments(Request $request, $controller)
                 $resolved = $resolver->resolve($request, $metadata);
 
                 if (!$resolved instanceof \Generator) {
-                    throw new \InvalidArgumentException(sprintf('%s::resolve() must yield at least one value.', get_class($resolver)));
+                    throw new \InvalidArgumentException(sprintf('%s::resolve() must yield at least one value.', \get_class($resolver)));
                 }
 
                 foreach ($resolved as $append) {
@@ -69,10 +69,10 @@ public function getArguments(Request $request, $controller)
 
             $representative = $controller;
 
-            if (is_array($representative)) {
-                $representative = sprintf('%s::%s()', get_class($representative[0]), $representative[1]);
-            } elseif (is_object($representative)) {
-                $representative = get_class($representative);
+            if (\is_array($representative)) {
+                $representative = sprintf('%s::%s()', \get_class($representative[0]), $representative[1]);
+            } elseif (\is_object($representative)) {
+                $representative = \get_class($representative);
             }
 
             throw new \RuntimeException(sprintf('Controller "%s" requires that you provide a value for the "$%s" argument. Either the argument is nullable and no null value has been provided, no default value has been provided or because there is a non optional argument after this one.', $representative, $metadata->getName()));
diff --git a/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/VariadicValueResolver.php b/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/VariadicValueResolver.php
index 56ae5f191c4d..7ee2d7af5cee 100644
--- a/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/VariadicValueResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/VariadicValueResolver.php
@@ -37,8 +37,8 @@ public function resolve(Request $request, ArgumentMetadata $argument)
     {
         $values = $request->attributes->get($argument->getName());
 
-        if (!is_array($values)) {
-            throw new \InvalidArgumentException(sprintf('The action argument "...$%1$s" is required to be an array, the request attribute "%1$s" contains a type of "%2$s" instead.', $argument->getName(), gettype($values)));
+        if (!\is_array($values)) {
+            throw new \InvalidArgumentException(sprintf('The action argument "...$%1$s" is required to be an array, the request attribute "%1$s" contains a type of "%2$s" instead.', $argument->getName(), \gettype($values)));
         }
 
         foreach ($values as $value) {
diff --git a/src/Symfony/Component/HttpKernel/Controller/ContainerControllerResolver.php b/src/Symfony/Component/HttpKernel/Controller/ContainerControllerResolver.php
index 426e6728839c..1704c749d89e 100644
--- a/src/Symfony/Component/HttpKernel/Controller/ContainerControllerResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/ContainerControllerResolver.php
@@ -40,7 +40,7 @@ public function getController(Request $request)
     {
         $controller = parent::getController($request);
 
-        if (is_array($controller) && isset($controller[0]) && is_string($controller[0]) && $this->container->has($controller[0])) {
+        if (\is_array($controller) && isset($controller[0]) && \is_string($controller[0]) && $this->container->has($controller[0])) {
             $controller[0] = $this->instantiateController($controller[0]);
         }
 
diff --git a/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php b/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php
index 4d4d5ac129dd..512b54d4707a 100644
--- a/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php
@@ -46,29 +46,29 @@ public function getController(Request $request)
             return false;
         }
 
-        if (is_array($controller)) {
+        if (\is_array($controller)) {
             return $controller;
         }
 
-        if (is_object($controller)) {
+        if (\is_object($controller)) {
             if (method_exists($controller, '__invoke')) {
                 return $controller;
             }
 
-            throw new \InvalidArgumentException(sprintf('Controller "%s" for URI "%s" is not callable.', get_class($controller), $request->getPathInfo()));
+            throw new \InvalidArgumentException(sprintf('Controller "%s" for URI "%s" is not callable.', \get_class($controller), $request->getPathInfo()));
         }
 
         if (false === strpos($controller, ':')) {
             if (method_exists($controller, '__invoke')) {
                 return $this->instantiateController($controller);
-            } elseif (function_exists($controller)) {
+            } elseif (\function_exists($controller)) {
                 return $controller;
             }
         }
 
         $callable = $this->createController($controller);
 
-        if (!is_callable($callable)) {
+        if (!\is_callable($callable)) {
             throw new \InvalidArgumentException(sprintf('The controller for URI "%s" is not callable. %s', $request->getPathInfo(), $this->getControllerError($callable)));
         }
 
@@ -113,7 +113,7 @@ protected function instantiateController($class)
 
     private function getControllerError($callable)
     {
-        if (is_string($callable)) {
+        if (\is_string($callable)) {
             if (false !== strpos($callable, '::')) {
                 $callable = explode('::', $callable);
             }
@@ -122,26 +122,26 @@ private function getControllerError($callable)
                 return sprintf('Class "%s" does not have a method "__invoke".', $callable);
             }
 
-            if (!function_exists($callable)) {
+            if (!\function_exists($callable)) {
                 return sprintf('Function "%s" does not exist.', $callable);
             }
         }
 
-        if (!is_array($callable)) {
-            return sprintf('Invalid type for controller given, expected string or array, got "%s".', gettype($callable));
+        if (!\is_array($callable)) {
+            return sprintf('Invalid type for controller given, expected string or array, got "%s".', \gettype($callable));
         }
 
-        if (2 !== count($callable)) {
+        if (2 !== \count($callable)) {
             return 'Invalid format for controller, expected array(controller, method) or controller::method.';
         }
 
         list($controller, $method) = $callable;
 
-        if (is_string($controller) && !class_exists($controller)) {
+        if (\is_string($controller) && !class_exists($controller)) {
             return sprintf('Class "%s" does not exist.', $controller);
         }
 
-        $className = is_object($controller) ? get_class($controller) : $controller;
+        $className = \is_object($controller) ? \get_class($controller) : $controller;
 
         if (method_exists($controller, $method)) {
             return sprintf('Method "%s" on class "%s" should be public and non-abstract.', $method, $className);
@@ -154,7 +154,7 @@ private function getControllerError($callable)
         foreach ($collection as $item) {
             $lev = levenshtein($method, $item);
 
-            if ($lev <= strlen($method) / 3 || false !== strpos($item, $method)) {
+            if ($lev <= \strlen($method) / 3 || false !== strpos($item, $method)) {
                 $alternatives[] = $item;
             }
         }
@@ -163,7 +163,7 @@ private function getControllerError($callable)
 
         $message = sprintf('Expected method "%s" on class "%s"', $method, $className);
 
-        if (count($alternatives) > 0) {
+        if (\count($alternatives) > 0) {
             $message .= sprintf(', did you mean "%s"?', implode('", "', $alternatives));
         } else {
             $message .= sprintf('. Available methods: "%s".', implode('", "', $collection));
diff --git a/src/Symfony/Component/HttpKernel/Controller/TraceableArgumentResolver.php b/src/Symfony/Component/HttpKernel/Controller/TraceableArgumentResolver.php
index 6fb0fa66aca7..39848127b76c 100644
--- a/src/Symfony/Component/HttpKernel/Controller/TraceableArgumentResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/TraceableArgumentResolver.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Controller;
 
-use Symfony\Component\Stopwatch\Stopwatch;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Stopwatch\Stopwatch;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
diff --git a/src/Symfony/Component/HttpKernel/Controller/TraceableControllerResolver.php b/src/Symfony/Component/HttpKernel/Controller/TraceableControllerResolver.php
index adaaa26d08bb..bf6b6aa1f2f8 100644
--- a/src/Symfony/Component/HttpKernel/Controller/TraceableControllerResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/TraceableControllerResolver.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Controller;
 
-use Symfony\Component\Stopwatch\Stopwatch;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Stopwatch\Stopwatch;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
diff --git a/src/Symfony/Component/HttpKernel/ControllerMetadata/ArgumentMetadataFactory.php b/src/Symfony/Component/HttpKernel/ControllerMetadata/ArgumentMetadataFactory.php
index 86683d55de3d..10e851b67a84 100644
--- a/src/Symfony/Component/HttpKernel/ControllerMetadata/ArgumentMetadataFactory.php
+++ b/src/Symfony/Component/HttpKernel/ControllerMetadata/ArgumentMetadataFactory.php
@@ -25,9 +25,9 @@ public function createArgumentMetadata($controller)
     {
         $arguments = array();
 
-        if (is_array($controller)) {
+        if (\is_array($controller)) {
             $reflection = new \ReflectionMethod($controller[0], $controller[1]);
-        } elseif (is_object($controller) && !$controller instanceof \Closure) {
+        } elseif (\is_object($controller) && !$controller instanceof \Closure) {
             $reflection = (new \ReflectionObject($controller))->getMethod('__invoke');
         } else {
             $reflection = new \ReflectionFunction($controller);
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
index 14abce761f88..76ad4a8c889a 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\HttpKernel\DataCollector;
 
-use Symfony\Component\HttpKernel\KernelInterface;
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Kernel;
+use Symfony\Component\HttpKernel\KernelInterface;
 use Symfony\Component\VarDumper\Caster\LinkStub;
 
 /**
@@ -67,11 +67,11 @@ public function collect(Request $request, Response $response, \Exception $except
             'php_architecture' => PHP_INT_SIZE * 8,
             'php_intl_locale' => class_exists('Locale', false) && \Locale::getDefault() ? \Locale::getDefault() : 'n/a',
             'php_timezone' => date_default_timezone_get(),
-            'xdebug_enabled' => extension_loaded('xdebug'),
-            'apcu_enabled' => extension_loaded('apcu') && ini_get('apc.enabled'),
-            'zend_opcache_enabled' => extension_loaded('Zend OPcache') && ini_get('opcache.enable'),
+            'xdebug_enabled' => \extension_loaded('xdebug'),
+            'apcu_enabled' => \extension_loaded('apcu') && ini_get('apc.enabled'),
+            'zend_opcache_enabled' => \extension_loaded('Zend OPcache') && ini_get('opcache.enable'),
             'bundles' => array(),
-            'sapi_name' => PHP_SAPI,
+            'sapi_name' => \PHP_SAPI,
         );
 
         if (isset($this->kernel)) {
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php
index faa0d9e37042..a3d8c99d84ff 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php
@@ -80,7 +80,7 @@ protected function getCasters()
             '*' => function ($v, array $a, Stub $s, $isNested) {
                 if (!$v instanceof Stub) {
                     foreach ($a as $k => $v) {
-                        if (is_object($v) && !$v instanceof \DateTimeInterface && !$v instanceof Stub) {
+                        if (\is_object($v) && !$v instanceof \DateTimeInterface && !$v instanceof Stub) {
                             $a[$k] = new CutStub($v);
                         }
                     }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
index dc8c60031e48..6ce0582d7249 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
@@ -18,8 +18,8 @@
 use Symfony\Component\VarDumper\Cloner\Data;
 use Symfony\Component\VarDumper\Cloner\VarCloner;
 use Symfony\Component\VarDumper\Dumper\CliDumper;
-use Symfony\Component\VarDumper\Dumper\HtmlDumper;
 use Symfony\Component\VarDumper\Dumper\DataDumperInterface;
+use Symfony\Component\VarDumper\Dumper\HtmlDumper;
 use Twig\Template;
 
 /**
@@ -105,7 +105,7 @@ public function dump(Data $data)
                                 $src = explode("\n", $src);
                                 $fileExcerpt = array();
 
-                                for ($i = max($line - 3, 1), $max = min($line + 3, count($src)); $i <= $max; ++$i) {
+                                for ($i = max($line - 3, 1), $max = min($line + 3, \count($src)); $i <= $max; ++$i) {
                                     $fileExcerpt[] = '<li'.($i === $line ? ' class="selected"' : '').'><code>'.$this->htmlEncode($src[$i - 1]).'</code></li>';
                                 }
 
@@ -200,7 +200,7 @@ public function unserialize($data)
         parent::unserialize($data);
         $charset = array_pop($this->data);
         $fileLinkFormat = array_pop($this->data);
-        $this->dataCount = count($this->data);
+        $this->dataCount = \count($this->data);
         self::__construct($this->stopwatch, $fileLinkFormat, $charset);
     }
 
@@ -244,13 +244,13 @@ public function __destruct()
             $this->isCollected = true;
 
             $h = headers_list();
-            $i = count($h);
+            $i = \count($h);
             array_unshift($h, 'Content-Type: '.ini_get('default_mimetype'));
             while (0 !== stripos($h[$i], 'Content-Type:')) {
                 --$i;
             }
 
-            if (!\in_array(PHP_SAPI, array('cli', 'phpdbg'), true) && stripos($h[$i], 'html')) {
+            if (!\in_array(\PHP_SAPI, array('cli', 'phpdbg'), true) && stripos($h[$i], 'html')) {
                 $this->dumper = new HtmlDumper('php://output', $this->charset);
                 $this->dumper->setDisplayOptions(array('fileLinkFormat' => $this->fileLinkFormat));
             } else {
@@ -276,7 +276,7 @@ private function doDump($data, $name, $file, $line)
                         $s = $this->style('meta', '%s');
                         $f = strip_tags($this->style('', $file));
                         $name = strip_tags($this->style('', $name));
-                        if ($fmt && $link = is_string($fmt) ? strtr($fmt, array('%f' => $file, '%l' => $line)) : $fmt->format($file, $line)) {
+                        if ($fmt && $link = \is_string($fmt) ? strtr($fmt, array('%f' => $file, '%l' => $line)) : $fmt->format($file, $line)) {
                             $name = sprintf('<a href="%s" title="%s">'.$s.'</a>', strip_tags($this->style('', $link)), $f, $name);
                         } else {
                             $name = sprintf('<abbr title="%s">'.$s.'</abbr>', $f, $name);
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
index e82a1fc19bb0..ec177d9fd48e 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\HttpKernel\DataCollector;
 
+use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcherInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcherInterface;
 
 /**
  * EventDataCollector.
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php
index 3f6fc32e04be..7a7d5d8711f7 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php
@@ -218,7 +218,7 @@ private function isSilencedOrDeprecationErrorLog(array $log)
             return true;
         }
 
-        if ($exception instanceof \ErrorException && in_array($exception->getSeverity(), array(E_DEPRECATED, E_USER_DEPRECATED), true)) {
+        if ($exception instanceof \ErrorException && \in_array($exception->getSeverity(), array(E_DEPRECATED, E_USER_DEPRECATED), true)) {
             return true;
         }
 
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php
index 8d8cc1a04d18..310b2f91a55d 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php
@@ -98,9 +98,9 @@ private function convertToBytes($memoryLimit)
         $memoryLimit = strtolower($memoryLimit);
         $max = strtolower(ltrim($memoryLimit, '+'));
         if (0 === strpos($max, '0x')) {
-            $max = intval($max, 16);
+            $max = \intval($max, 16);
         } elseif (0 === strpos($max, '0')) {
-            $max = intval($max, 8);
+            $max = \intval($max, 8);
         } else {
             $max = (int) $max;
         }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
index 54d17d28c7ca..e415833cc33e 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Component\HttpKernel\DataCollector;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Cookie;
 use Symfony\Component\HttpFoundation\ParameterBag;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
@@ -42,7 +42,7 @@ public function collect(Request $request, Response $response, \Exception $except
         $route = '';
         foreach ($request->attributes->all() as $key => $value) {
             if ('_route' === $key) {
-                $route = is_object($value) ? $value->getPath() : $value;
+                $route = \is_object($value) ? $value->getPath() : $value;
                 $attributes[$key] = $route;
             } else {
                 $attributes[$key] = $value;
@@ -116,7 +116,7 @@ public function collect(Request $request, Response $response, \Exception $except
         }
 
         foreach ($this->data as $key => $value) {
-            if (!is_array($value)) {
+            if (!\is_array($value)) {
                 continue;
             }
             if ('request_headers' === $key || 'response_headers' === $key) {
@@ -149,7 +149,7 @@ public function collect(Request $request, Response $response, \Exception $except
             ));
         }
 
-        $this->data['identifier'] = $this->data['route'] ?: (is_array($this->data['controller']) ? $this->data['controller']['class'].'::'.$this->data['controller']['method'].'()' : $this->data['controller']);
+        $this->data['identifier'] = $this->data['route'] ?: (\is_array($this->data['controller']) ? $this->data['controller']['class'].'::'.$this->data['controller']['method'].'()' : $this->data['controller']);
     }
 
     public function lateCollect()
@@ -350,25 +350,25 @@ public function getName()
      */
     protected function parseController($controller)
     {
-        if (is_string($controller) && false !== strpos($controller, '::')) {
+        if (\is_string($controller) && false !== strpos($controller, '::')) {
             $controller = explode('::', $controller);
         }
 
-        if (is_array($controller)) {
+        if (\is_array($controller)) {
             try {
                 $r = new \ReflectionMethod($controller[0], $controller[1]);
 
                 return array(
-                    'class' => is_object($controller[0]) ? get_class($controller[0]) : $controller[0],
+                    'class' => \is_object($controller[0]) ? \get_class($controller[0]) : $controller[0],
                     'method' => $controller[1],
                     'file' => $r->getFileName(),
                     'line' => $r->getStartLine(),
                 );
             } catch (\ReflectionException $e) {
-                if (is_callable($controller)) {
+                if (\is_callable($controller)) {
                     // using __call or  __callStatic
                     return array(
-                        'class' => is_object($controller[0]) ? get_class($controller[0]) : $controller[0],
+                        'class' => \is_object($controller[0]) ? \get_class($controller[0]) : $controller[0],
                         'method' => $controller[1],
                         'file' => 'n/a',
                         'line' => 'n/a',
@@ -388,7 +388,7 @@ protected function parseController($controller)
             );
         }
 
-        if (is_object($controller)) {
+        if (\is_object($controller)) {
             $r = new \ReflectionClass($controller);
 
             return array(
@@ -399,6 +399,6 @@ protected function parseController($controller)
             );
         }
 
-        return is_string($controller) ? $controller : 'n/a';
+        return \is_string($controller) ? $controller : 'n/a';
     }
 }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php
index afd34f8af814..481747b3c839 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\HttpKernel\DataCollector;
 
+use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
 
 /**
diff --git a/src/Symfony/Component/HttpKernel/Debug/FileLinkFormatter.php b/src/Symfony/Component/HttpKernel/Debug/FileLinkFormatter.php
index a4aa6c79ac32..bafb50954855 100644
--- a/src/Symfony/Component/HttpKernel/Debug/FileLinkFormatter.php
+++ b/src/Symfony/Component/HttpKernel/Debug/FileLinkFormatter.php
@@ -34,8 +34,8 @@ class FileLinkFormatter implements \Serializable
     public function __construct($fileLinkFormat = null, RequestStack $requestStack = null, string $baseDir = null, $urlFormat = null)
     {
         $fileLinkFormat = $fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
-        if ($fileLinkFormat && !is_array($fileLinkFormat)) {
-            $i = strpos($f = $fileLinkFormat, '&', max(strrpos($f, '%f'), strrpos($f, '%l'))) ?: strlen($f);
+        if ($fileLinkFormat && !\is_array($fileLinkFormat)) {
+            $i = strpos($f = $fileLinkFormat, '&', max(strrpos($f, '%f'), strrpos($f, '%l'))) ?: \strlen($f);
             $fileLinkFormat = array(substr($f, 0, $i)) + preg_split('/&([^>]++)>/', substr($f, $i), -1, PREG_SPLIT_DELIM_CAPTURE);
         }
 
@@ -50,7 +50,7 @@ public function format($file, $line)
         if ($fmt = $this->getFileLinkFormat()) {
             for ($i = 1; isset($fmt[$i]); ++$i) {
                 if (0 === strpos($file, $k = $fmt[$i++])) {
-                    $file = substr_replace($file, $fmt[$i], 0, strlen($k));
+                    $file = substr_replace($file, $fmt[$i], 0, \strlen($k));
                     break;
                 }
             }
@@ -97,7 +97,7 @@ private function getFileLinkFormat()
 
                 return array(
                     $request->getSchemeAndHttpHost().$request->getBaseUrl().$this->urlFormat,
-                    $this->baseDir.DIRECTORY_SEPARATOR, '',
+                    $this->baseDir.\DIRECTORY_SEPARATOR, '',
                 );
             }
         }
diff --git a/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php b/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
index fbc49dffc8da..ddf4fa7cecf0 100644
--- a/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
+++ b/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpKernel\Debug;
 
 use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher as BaseTraceableEventDispatcher;
-use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\HttpKernel\KernelEvents;
 
 /**
  * Collects some data about event listeners.
diff --git a/src/Symfony/Component/HttpKernel/DependencyInjection/AddAnnotatedClassesToCachePass.php b/src/Symfony/Component/HttpKernel/DependencyInjection/AddAnnotatedClassesToCachePass.php
index 0f9540972f14..3e054a7ee3a1 100644
--- a/src/Symfony/Component/HttpKernel/DependencyInjection/AddAnnotatedClassesToCachePass.php
+++ b/src/Symfony/Component/HttpKernel/DependencyInjection/AddAnnotatedClassesToCachePass.php
@@ -13,8 +13,8 @@
 
 use Composer\Autoload\ClassLoader;
 use Symfony\Component\Debug\DebugClassLoader;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Kernel;
 
 /**
@@ -88,7 +88,7 @@ private function getClassesInComposerClassMaps()
         $classes = array();
 
         foreach (spl_autoload_functions() as $function) {
-            if (!is_array($function)) {
+            if (!\is_array($function)) {
                 continue;
             }
 
@@ -96,7 +96,7 @@ private function getClassesInComposerClassMaps()
                 $function = $function[0]->getClassLoader();
             }
 
-            if (is_array($function) && $function[0] instanceof ClassLoader) {
+            if (\is_array($function) && $function[0] instanceof ClassLoader) {
                 $classes += array_filter($function[0]->getClassMap());
             }
         }
diff --git a/src/Symfony/Component/HttpKernel/DependencyInjection/FragmentRendererPass.php b/src/Symfony/Component/HttpKernel/DependencyInjection/FragmentRendererPass.php
index 825038b695e9..2a8c1b1b11bc 100644
--- a/src/Symfony/Component/HttpKernel/DependencyInjection/FragmentRendererPass.php
+++ b/src/Symfony/Component/HttpKernel/DependencyInjection/FragmentRendererPass.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\HttpKernel\DependencyInjection;
 
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\HttpKernel\Fragment\FragmentRendererInterface;
diff --git a/src/Symfony/Component/HttpKernel/DependencyInjection/LoggerPass.php b/src/Symfony/Component/HttpKernel/DependencyInjection/LoggerPass.php
index 2ad7f322289f..b6df1f6e614c 100644
--- a/src/Symfony/Component/HttpKernel/DependencyInjection/LoggerPass.php
+++ b/src/Symfony/Component/HttpKernel/DependencyInjection/LoggerPass.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpKernel\DependencyInjection;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\Log\Logger;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\Log\Logger;
 
 /**
  * Registers the default logger if necessary.
diff --git a/src/Symfony/Component/HttpKernel/DependencyInjection/MergeExtensionConfigurationPass.php b/src/Symfony/Component/HttpKernel/DependencyInjection/MergeExtensionConfigurationPass.php
index dcd73828de0b..1dbf7f7beeed 100644
--- a/src/Symfony/Component/HttpKernel/DependencyInjection/MergeExtensionConfigurationPass.php
+++ b/src/Symfony/Component/HttpKernel/DependencyInjection/MergeExtensionConfigurationPass.php
@@ -31,7 +31,7 @@ public function __construct(array $extensions)
     public function process(ContainerBuilder $container)
     {
         foreach ($this->extensions as $extension) {
-            if (!count($container->getExtensionConfig($extension))) {
+            if (!\count($container->getExtensionConfig($extension))) {
                 $container->loadFromExtension($extension, array());
             }
         }
diff --git a/src/Symfony/Component/HttpKernel/DependencyInjection/RegisterControllerArgumentLocatorsPass.php b/src/Symfony/Component/HttpKernel/DependencyInjection/RegisterControllerArgumentLocatorsPass.php
index 8cb19c479041..7747c6299c24 100644
--- a/src/Symfony/Component/HttpKernel/DependencyInjection/RegisterControllerArgumentLocatorsPass.php
+++ b/src/Symfony/Component/HttpKernel/DependencyInjection/RegisterControllerArgumentLocatorsPass.php
@@ -60,7 +60,7 @@ public function process(ContainerBuilder $container)
             while ($def instanceof ChildDefinition) {
                 $def = $container->findDefinition($def->getParent());
                 $class = $class ?: $def->getClass();
-                $bindings = $def->getBindings();
+                $bindings += $def->getBindings();
             }
             $class = $parameterBag->resolveValue($class);
 
diff --git a/src/Symfony/Component/HttpKernel/DependencyInjection/RemoveEmptyControllerArgumentLocatorsPass.php b/src/Symfony/Component/HttpKernel/DependencyInjection/RemoveEmptyControllerArgumentLocatorsPass.php
index 52c6d69c1f71..c74126940698 100644
--- a/src/Symfony/Component/HttpKernel/DependencyInjection/RemoveEmptyControllerArgumentLocatorsPass.php
+++ b/src/Symfony/Component/HttpKernel/DependencyInjection/RemoveEmptyControllerArgumentLocatorsPass.php
@@ -48,7 +48,7 @@ public function process(ContainerBuilder $container)
                 // any methods listed for call-at-instantiation cannot be actions
                 $reason = false;
                 $action = substr(strrchr($controller, ':'), 1);
-                $id = substr($controller, 0, -1 - strlen($action));
+                $id = substr($controller, 0, -1 - \strlen($action));
                 $controllerDef = $container->getDefinition($id);
                 foreach ($controllerDef->getMethodCalls() as list($method)) {
                     if (0 === strcasecmp($action, $method)) {
diff --git a/src/Symfony/Component/HttpKernel/Event/FilterControllerArgumentsEvent.php b/src/Symfony/Component/HttpKernel/Event/FilterControllerArgumentsEvent.php
index 309647bc8e9b..5e178f2b0bde 100644
--- a/src/Symfony/Component/HttpKernel/Event/FilterControllerArgumentsEvent.php
+++ b/src/Symfony/Component/HttpKernel/Event/FilterControllerArgumentsEvent.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Event;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * Allows filtering of controller arguments.
diff --git a/src/Symfony/Component/HttpKernel/Event/FilterControllerEvent.php b/src/Symfony/Component/HttpKernel/Event/FilterControllerEvent.php
index cbbfd0fe4488..7eab4493769b 100644
--- a/src/Symfony/Component/HttpKernel/Event/FilterControllerEvent.php
+++ b/src/Symfony/Component/HttpKernel/Event/FilterControllerEvent.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Event;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * Allows filtering of a controller callable.
diff --git a/src/Symfony/Component/HttpKernel/Event/FilterResponseEvent.php b/src/Symfony/Component/HttpKernel/Event/FilterResponseEvent.php
index 4cdc207f56b4..04589f7b5c32 100644
--- a/src/Symfony/Component/HttpKernel/Event/FilterResponseEvent.php
+++ b/src/Symfony/Component/HttpKernel/Event/FilterResponseEvent.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\HttpKernel\Event;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * Allows to filter a Response object.
diff --git a/src/Symfony/Component/HttpKernel/Event/GetResponseForControllerResultEvent.php b/src/Symfony/Component/HttpKernel/Event/GetResponseForControllerResultEvent.php
index 592653d77fa0..a0082821decc 100644
--- a/src/Symfony/Component/HttpKernel/Event/GetResponseForControllerResultEvent.php
+++ b/src/Symfony/Component/HttpKernel/Event/GetResponseForControllerResultEvent.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Event;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * Allows to create a response for the return value of a controller.
diff --git a/src/Symfony/Component/HttpKernel/Event/GetResponseForExceptionEvent.php b/src/Symfony/Component/HttpKernel/Event/GetResponseForExceptionEvent.php
index cf0fcd16233e..7fab006d1305 100644
--- a/src/Symfony/Component/HttpKernel/Event/GetResponseForExceptionEvent.php
+++ b/src/Symfony/Component/HttpKernel/Event/GetResponseForExceptionEvent.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Event;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * Allows to create a response for a thrown exception.
diff --git a/src/Symfony/Component/HttpKernel/Event/KernelEvent.php b/src/Symfony/Component/HttpKernel/Event/KernelEvent.php
index 0dcf879f3da7..f3db8a60d9ec 100644
--- a/src/Symfony/Component/HttpKernel/Event/KernelEvent.php
+++ b/src/Symfony/Component/HttpKernel/Event/KernelEvent.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\HttpKernel\Event;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * Base class for events thrown in the HttpKernel component.
diff --git a/src/Symfony/Component/HttpKernel/Event/PostResponseEvent.php b/src/Symfony/Component/HttpKernel/Event/PostResponseEvent.php
index 2406fddbe89d..0981e64c9235 100644
--- a/src/Symfony/Component/HttpKernel/Event/PostResponseEvent.php
+++ b/src/Symfony/Component/HttpKernel/Event/PostResponseEvent.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\HttpKernel\Event;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * Allows to execute logic after a response was sent.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php b/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php
index a54ca62d87b6..41187d4125d9 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\HttpKernel\EventListener;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * Sets the session in the request.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php b/src/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php
index 75f810e98834..cb5da50bd086 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\HttpKernel\EventListener;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Cookie;
 use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
-use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
 
 /**
  * TestSessionListener.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/AddRequestFormatsListener.php b/src/Symfony/Component/HttpKernel/EventListener/AddRequestFormatsListener.php
index f21fc6ab7c78..5ec528417c98 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/AddRequestFormatsListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/AddRequestFormatsListener.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpKernel\EventListener;
 
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
 
 /**
  * Adds configured formats to each request.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php b/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php
index 4c2398cc0dde..47fe05c5e1b7 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php
@@ -12,15 +12,15 @@
 namespace Symfony\Component\HttpKernel\EventListener;
 
 use Psr\Log\LoggerInterface;
+use Symfony\Component\Console\ConsoleEvents;
+use Symfony\Component\Console\Event\ConsoleEvent;
+use Symfony\Component\Console\Output\ConsoleOutputInterface;
 use Symfony\Component\Debug\ErrorHandler;
 use Symfony\Component\Debug\ExceptionHandler;
 use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpKernel\Event\KernelEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\Console\ConsoleEvents;
-use Symfony\Component\Console\Event\ConsoleEvent;
-use Symfony\Component\Console\Output\ConsoleOutputInterface;
 
 /**
  * Configures errors and exceptions handlers.
@@ -70,14 +70,14 @@ public function configure(Event $event = null)
         $this->firstCall = $this->hasTerminatedWithException = false;
 
         $handler = set_exception_handler('var_dump');
-        $handler = is_array($handler) ? $handler[0] : null;
+        $handler = \is_array($handler) ? $handler[0] : null;
         restore_exception_handler();
 
         if ($this->logger || null !== $this->throwAt) {
             if ($handler instanceof ErrorHandler) {
                 if ($this->logger) {
                     $handler->setDefaultLogger($this->logger, $this->levels);
-                    if (is_array($this->levels)) {
+                    if (\is_array($this->levels)) {
                         $levels = 0;
                         foreach ($this->levels as $type => $log) {
                             $levels |= $type;
@@ -126,7 +126,7 @@ public function configure(Event $event = null)
         if ($this->exceptionHandler) {
             if ($handler instanceof ErrorHandler) {
                 $h = $handler->setExceptionHandler('var_dump');
-                if (is_array($h) && $h[0] instanceof ExceptionHandler) {
+                if (\is_array($h) && $h[0] instanceof ExceptionHandler) {
                     $handler->setExceptionHandler($h);
                     $handler = $h[0];
                 } else {
@@ -147,7 +147,7 @@ public static function getSubscribedEvents()
     {
         $events = array(KernelEvents::REQUEST => array('configure', 2048));
 
-        if ('cli' === PHP_SAPI && defined('Symfony\Component\Console\ConsoleEvents::COMMAND')) {
+        if ('cli' === \PHP_SAPI && \defined('Symfony\Component\Console\ConsoleEvents::COMMAND')) {
             $events[ConsoleEvents::COMMAND] = array('configure', 2048);
         }
 
diff --git a/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php b/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php
index 983f1c2b8f2b..147e09013dd9 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php
@@ -14,14 +14,14 @@
 use Psr\Log\LoggerInterface;
 use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
-use Symfony\Component\HttpKernel\Log\DebugLoggerInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
-use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\HttpKernel\Log\DebugLoggerInterface;
 
 /**
  * ExceptionListener.
@@ -45,16 +45,16 @@ public function onKernelException(GetResponseForExceptionEvent $event)
     {
         $exception = $event->getException();
         $request = $event->getRequest();
-        $eventDispatcher = func_num_args() > 2 ? func_get_arg(2) : null;
+        $eventDispatcher = \func_num_args() > 2 ? func_get_arg(2) : null;
 
-        $this->logException($exception, sprintf('Uncaught PHP Exception %s: "%s" at %s line %s', get_class($exception), $exception->getMessage(), $exception->getFile(), $exception->getLine()));
+        $this->logException($exception, sprintf('Uncaught PHP Exception %s: "%s" at %s line %s', \get_class($exception), $exception->getMessage(), $exception->getFile(), $exception->getLine()));
 
         $request = $this->duplicateRequest($exception, $request);
 
         try {
             $response = $event->getKernel()->handle($request, HttpKernelInterface::SUB_REQUEST, false);
         } catch (\Exception $e) {
-            $this->logException($e, sprintf('Exception thrown when handling an exception (%s: %s at %s line %s)', get_class($e), $e->getMessage(), $e->getFile(), $e->getLine()));
+            $this->logException($e, sprintf('Exception thrown when handling an exception (%s: %s at %s line %s)', \get_class($e), $e->getMessage(), $e->getFile(), $e->getLine()));
 
             $wrapper = $e;
 
diff --git a/src/Symfony/Component/HttpKernel/EventListener/FragmentListener.php b/src/Symfony/Component/HttpKernel/EventListener/FragmentListener.php
index f6bfd6cc6d80..b47aa7cca055 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/FragmentListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/FragmentListener.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\HttpKernel\EventListener;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\UriSigner;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * Handles content fragments represented by special URIs.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/LocaleListener.php b/src/Symfony/Component/HttpKernel/EventListener/LocaleListener.php
index 6c2b5098dcf4..1067e8a0a51d 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/LocaleListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/LocaleListener.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\HttpKernel\EventListener;
 
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpFoundation\RequestStack;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\RequestContextAwareInterface;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * Initializes the locale based on the current request.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php b/src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php
index 52e06e1b3551..e2826245db98 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Component\HttpKernel\EventListener;
 
-use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\RequestMatcherInterface;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
 use Symfony\Component\HttpKernel\Event\PostResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Profiler\Profiler;
-use Symfony\Component\HttpFoundation\RequestMatcherInterface;
-use Symfony\Component\HttpFoundation\RequestStack;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * ProfilerListener collects data for the current request by listening to the kernel events.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/ResponseListener.php b/src/Symfony/Component/HttpKernel/EventListener/ResponseListener.php
index 01475c2a77d3..0550c0230ef3 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/ResponseListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/ResponseListener.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\HttpKernel\EventListener;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * ResponseListener fixes the Response headers based on the Request.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/RouterListener.php b/src/Symfony/Component/HttpKernel/EventListener/RouterListener.php
index f7cf446e52fa..391928456462 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/RouterListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/RouterListener.php
@@ -12,25 +12,25 @@
 namespace Symfony\Component\HttpKernel\EventListener;
 
 use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
-use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
-use Symfony\Component\HttpKernel\Kernel;
-use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
 use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpKernel\Kernel;
+use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\NoConfigurationException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
-use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
 use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
+use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
 use Symfony\Component\Routing\RequestContext;
 use Symfony\Component\Routing\RequestContextAwareInterface;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\HttpFoundation\Request;
 
 /**
  * Initializes the context from the request and sets request attributes based on a matching route.
@@ -167,7 +167,7 @@ public static function getSubscribedEvents()
     private function createWelcomeResponse()
     {
         $version = Kernel::VERSION;
-        $baseDir = realpath($this->projectDir).DIRECTORY_SEPARATOR;
+        $baseDir = realpath($this->projectDir).\DIRECTORY_SEPARATOR;
         $docVersion = substr(Kernel::VERSION, 0, 3);
 
         ob_start();
diff --git a/src/Symfony/Component/HttpKernel/EventListener/StreamedResponseListener.php b/src/Symfony/Component/HttpKernel/EventListener/StreamedResponseListener.php
index 671db5d82709..2c616b9182b3 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/StreamedResponseListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/StreamedResponseListener.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\HttpKernel\EventListener;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * StreamedResponseListener is responsible for sending the Response
diff --git a/src/Symfony/Component/HttpKernel/EventListener/SurrogateListener.php b/src/Symfony/Component/HttpKernel/EventListener/SurrogateListener.php
index 37d1b9d04eaa..634353385715 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/SurrogateListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/SurrogateListener.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\HttpKernel\EventListener;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\HttpCache\HttpCache;
 use Symfony\Component\HttpKernel\HttpCache\SurrogateInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * SurrogateListener adds a Surrogate-Control HTTP header when the Response needs to be parsed for Surrogates.
diff --git a/src/Symfony/Component/HttpKernel/EventListener/TranslatorListener.php b/src/Symfony/Component/HttpKernel/EventListener/TranslatorListener.php
index 6967ad0298b5..2a5fc712807d 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/TranslatorListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/TranslatorListener.php
@@ -13,10 +13,10 @@
 
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\Translation\TranslatorInterface;
 
 /**
diff --git a/src/Symfony/Component/HttpKernel/Fragment/AbstractSurrogateFragmentRenderer.php b/src/Symfony/Component/HttpKernel/Fragment/AbstractSurrogateFragmentRenderer.php
index ba1f3687038a..6ab6ec1fd0ac 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/AbstractSurrogateFragmentRenderer.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/AbstractSurrogateFragmentRenderer.php
@@ -92,13 +92,13 @@ private function generateSignedFragmentUri($uri, Request $request): string
         // we need to sign the absolute URI, but want to return the path only.
         $fragmentUri = $this->signer->sign($this->generateFragmentUri($uri, $request, true));
 
-        return substr($fragmentUri, strlen($request->getSchemeAndHttpHost()));
+        return substr($fragmentUri, \strlen($request->getSchemeAndHttpHost()));
     }
 
     private function containsNonScalars(array $values): bool
     {
         foreach ($values as $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 return $this->containsNonScalars($value);
             } elseif (!is_scalar($value) && null !== $value) {
                 return true;
diff --git a/src/Symfony/Component/HttpKernel/Fragment/FragmentHandler.php b/src/Symfony/Component/HttpKernel/Fragment/FragmentHandler.php
index aa61bd1f7dd6..0c31826b27a0 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/FragmentHandler.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/FragmentHandler.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\HttpKernel\Fragment;
 
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\StreamedResponse;
-use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
 
 /**
diff --git a/src/Symfony/Component/HttpKernel/Fragment/FragmentRendererInterface.php b/src/Symfony/Component/HttpKernel/Fragment/FragmentRendererInterface.php
index b177c3ac12ca..bcf4e9944a9d 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/FragmentRendererInterface.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/FragmentRendererInterface.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpKernel\Fragment;
 
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\Controller\ControllerReference;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Controller\ControllerReference;
 
 /**
  * Interface implemented by all rendering strategies.
diff --git a/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php b/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
index d65d373ee30c..3ee0cfa2640f 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
@@ -13,9 +13,9 @@
 
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\Templating\EngineInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
 use Symfony\Component\HttpKernel\UriSigner;
+use Symfony\Component\Templating\EngineInterface;
 use Twig\Environment;
 use Twig\Error\LoaderError;
 use Twig\Loader\ExistsLoaderInterface;
@@ -89,7 +89,7 @@ public function render($uri, Request $request, array $options = array())
             }
 
             // we need to sign the absolute URI, but want to return the path only.
-            $uri = substr($this->signer->sign($this->generateFragmentUri($uri, $request, true)), strlen($request->getSchemeAndHttpHost()));
+            $uri = substr($this->signer->sign($this->generateFragmentUri($uri, $request, true)), \strlen($request->getSchemeAndHttpHost()));
         }
 
         // We need to replace ampersands in the URI with the encoded form in order to return valid html/xml content.
@@ -102,12 +102,12 @@ public function render($uri, Request $request, array $options = array())
             $content = $template;
         }
 
-        $attributes = isset($options['attributes']) && is_array($options['attributes']) ? $options['attributes'] : array();
+        $attributes = isset($options['attributes']) && \is_array($options['attributes']) ? $options['attributes'] : array();
         if (isset($options['id']) && $options['id']) {
             $attributes['id'] = $options['id'];
         }
         $renderedAttributes = '';
-        if (count($attributes) > 0) {
+        if (\count($attributes) > 0) {
             $flags = ENT_QUOTES | ENT_SUBSTITUTE;
             foreach ($attributes as $attribute => $value) {
                 $renderedAttributes .= sprintf(
diff --git a/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php b/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
index 0248e0ccd8b9..712248578d0a 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/InlineFragmentRenderer.php
@@ -11,13 +11,14 @@
 
 namespace Symfony\Component\HttpKernel\Fragment;
 
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
-use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpKernel\HttpCache\SubRequestHandler;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
 
 /**
  * Implements the inline rendering strategy where the Request is rendered by the current HTTP kernel.
@@ -76,7 +77,7 @@ public function render($uri, Request $request, array $options = array())
 
         $level = ob_get_level();
         try {
-            return $this->kernel->handle($subRequest, HttpKernelInterface::SUB_REQUEST, false);
+            return SubRequestHandler::handle($this->kernel, $subRequest, HttpKernelInterface::SUB_REQUEST, false);
         } catch (\Exception $e) {
             // we dispatch the exception event to trigger the logging
             // the response that comes back is simply ignored
@@ -109,15 +110,6 @@ protected function createSubRequest($uri, Request $request)
         $cookies = $request->cookies->all();
         $server = $request->server->all();
 
-        if (Request::HEADER_X_FORWARDED_FOR & Request::getTrustedHeaderSet()) {
-            $currentXForwardedFor = $request->headers->get('X_FORWARDED_FOR', '');
-
-            $server['HTTP_X_FORWARDED_FOR'] = ($currentXForwardedFor ? $currentXForwardedFor.', ' : '').$request->getClientIp();
-        }
-
-        $trustedProxies = Request::getTrustedProxies();
-        $server['REMOTE_ADDR'] = $trustedProxies ? reset($trustedProxies) : '127.0.0.1';
-
         unset($server['HTTP_IF_MODIFIED_SINCE']);
         unset($server['HTTP_IF_NONE_MATCH']);
 
diff --git a/src/Symfony/Component/HttpKernel/Fragment/RoutableFragmentRenderer.php b/src/Symfony/Component/HttpKernel/Fragment/RoutableFragmentRenderer.php
index d7eeb89a6bef..0c1b95d4e939 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/RoutableFragmentRenderer.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/RoutableFragmentRenderer.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Fragment;
 
-use Symfony\Component\HttpKernel\Controller\ControllerReference;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Controller\ControllerReference;
 use Symfony\Component\HttpKernel\EventListener\FragmentListener;
 
 /**
@@ -80,7 +80,7 @@ protected function generateFragmentUri(ControllerReference $reference, Request $
     private function checkNonScalar($values)
     {
         foreach ($values as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $this->checkNonScalar($value);
             } elseif (!is_scalar($value) && null !== $value) {
                 throw new \LogicException(sprintf('Controller attributes cannot contain non-scalar/non-null values (value for key "%s" is not a scalar or null).', $key));
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/Esi.php b/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
index d09907ea6220..69134c71a12c 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
@@ -71,7 +71,7 @@ public function process(Request $request, Response $response)
         }
 
         $parts = explode(';', $type);
-        if (!in_array($parts[0], $this->contentTypes)) {
+        if (!\in_array($parts[0], $this->contentTypes)) {
             return $response;
         }
 
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php b/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php
index aa234f13ba59..fa3be46c8e2a 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php
@@ -15,10 +15,10 @@
 
 namespace Symfony\Component\HttpKernel\HttpCache;
 
-use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\HttpKernel\TerminableInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\TerminableInterface;
 
 /**
  * Cache provides HTTP caching.
@@ -370,7 +370,7 @@ protected function validate(Request $request, Response $entry, $catch = false)
 
             // return the response and not the cache entry if the response is valid but not cached
             $etag = $response->getEtag();
-            if ($etag && in_array($etag, $requestEtags) && !in_array($etag, $cachedEtags)) {
+            if ($etag && \in_array($etag, $requestEtags) && !\in_array($etag, $cachedEtags)) {
                 return $response;
             }
 
@@ -444,30 +444,11 @@ protected function forward(Request $request, $catch = false, Response $entry = n
             $this->surrogate->addSurrogateCapability($request);
         }
 
-        // modify the X-Forwarded-For header if needed
-        $forwardedFor = $request->headers->get('X-Forwarded-For');
-        if ($forwardedFor) {
-            $request->headers->set('X-Forwarded-For', $forwardedFor.', '.$request->server->get('REMOTE_ADDR'));
-        } else {
-            $request->headers->set('X-Forwarded-For', $request->server->get('REMOTE_ADDR'));
-        }
-
-        // fix the client IP address by setting it to 127.0.0.1 as HttpCache
-        // is always called from the same process as the backend.
-        $request->server->set('REMOTE_ADDR', '127.0.0.1');
-
-        // make sure HttpCache is a trusted proxy
-        if (!in_array('127.0.0.1', $trustedProxies = Request::getTrustedProxies())) {
-            $trustedProxies[] = '127.0.0.1';
-            Request::setTrustedProxies($trustedProxies, Request::HEADER_X_FORWARDED_ALL);
-        }
-
         // always a "master" request (as the real master request can be in cache)
-        $response = $this->kernel->handle($request, HttpKernelInterface::MASTER_REQUEST, $catch);
-        // FIXME: we probably need to also catch exceptions if raw === true
+        $response = SubRequestHandler::handle($this->kernel, $request, HttpKernelInterface::MASTER_REQUEST, $catch);
 
         // we don't implement the stale-if-error on Requests, which is nonetheless part of the RFC
-        if (null !== $entry && in_array($response->getStatusCode(), array(500, 502, 503, 504))) {
+        if (null !== $entry && \in_array($response->getStatusCode(), array(500, 502, 503, 504))) {
             if (null === $age = $entry->headers->getCacheControlDirective('stale-if-error')) {
                 $age = $this->options['stale_if_error'];
             }
@@ -606,7 +587,7 @@ private function restoreResponseBody(Request $request, Response $response)
             $response->setContent(ob_get_clean());
             $response->headers->remove('X-Body-Eval');
             if (!$response->headers->has('Transfer-Encoding')) {
-                $response->headers->set('Content-Length', strlen($response->getContent()));
+                $response->headers->set('Content-Length', \strlen($response->getContent()));
             }
         } elseif ($response->headers->has('X-Body-File')) {
             // Response does not include possibly dynamic content (ESI, SSI), so we need
@@ -640,7 +621,7 @@ private function isPrivateRequest(Request $request)
             $key = strtolower(str_replace('HTTP_', '', $key));
 
             if ('cookie' === $key) {
-                if (count($request->cookies->all())) {
+                if (\count($request->cookies->all())) {
                     return true;
                 }
             } elseif ($request->headers->has($key)) {
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/Ssi.php b/src/Symfony/Component/HttpKernel/HttpCache/Ssi.php
index 3178c3351596..58df17601995 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/Ssi.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/Ssi.php
@@ -58,7 +58,7 @@ public function process(Request $request, Response $response)
         }
 
         $parts = explode(';', $type);
-        if (!in_array($parts[0], $this->contentTypes)) {
+        if (!\in_array($parts[0], $this->contentTypes)) {
             return $response;
         }
 
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/Store.php b/src/Symfony/Component/HttpKernel/HttpCache/Store.php
index 5f54dbe62e9e..925ca96fd4ba 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/Store.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/Store.php
@@ -66,7 +66,7 @@ public function lock(Request $request)
 
         if (!isset($this->locks[$key])) {
             $path = $this->getPath($key);
-            if (!file_exists(dirname($path)) && false === @mkdir(dirname($path), 0777, true) && !is_dir(dirname($path))) {
+            if (!file_exists(\dirname($path)) && false === @mkdir(\dirname($path), 0777, true) && !is_dir(\dirname($path))) {
                 return $path;
             }
             $h = fopen($path, 'cb');
@@ -185,7 +185,7 @@ public function write(Request $request, Response $response)
             $response->headers->set('X-Content-Digest', $digest);
 
             if (!$response->headers->has('Transfer-Encoding')) {
-                $response->headers->set('Content-Length', strlen($response->getContent()));
+                $response->headers->set('Content-Length', \strlen($response->getContent()));
             }
         }
 
@@ -373,17 +373,17 @@ private function save($key, $data)
             @ftruncate($fp, 0);
             @fseek($fp, 0);
             $len = @fwrite($fp, $data);
-            if (strlen($data) !== $len) {
+            if (\strlen($data) !== $len) {
                 @ftruncate($fp, 0);
 
                 return false;
             }
         } else {
-            if (!file_exists(dirname($path)) && false === @mkdir(dirname($path), 0777, true) && !is_dir(dirname($path))) {
+            if (!file_exists(\dirname($path)) && false === @mkdir(\dirname($path), 0777, true) && !is_dir(\dirname($path))) {
                 return false;
             }
 
-            $tmpFile = tempnam(dirname($path), basename($path));
+            $tmpFile = tempnam(\dirname($path), basename($path));
             if (false === $fp = @fopen($tmpFile, 'wb')) {
                 @unlink($tmpFile);
 
@@ -410,7 +410,7 @@ private function save($key, $data)
 
     public function getPath($key)
     {
-        return $this->root.DIRECTORY_SEPARATOR.substr($key, 0, 2).DIRECTORY_SEPARATOR.substr($key, 2, 2).DIRECTORY_SEPARATOR.substr($key, 4, 2).DIRECTORY_SEPARATOR.substr($key, 6);
+        return $this->root.\DIRECTORY_SEPARATOR.substr($key, 0, 2).\DIRECTORY_SEPARATOR.substr($key, 2, 2).\DIRECTORY_SEPARATOR.substr($key, 4, 2).\DIRECTORY_SEPARATOR.substr($key, 6);
     }
 
     /**
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/SubRequestHandler.php b/src/Symfony/Component/HttpKernel/HttpCache/SubRequestHandler.php
new file mode 100644
index 000000000000..8c57356ac3d2
--- /dev/null
+++ b/src/Symfony/Component/HttpKernel/HttpCache/SubRequestHandler.php
@@ -0,0 +1,87 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\HttpCache;
+
+use Symfony\Component\HttpFoundation\IpUtils;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @internal
+ */
+class SubRequestHandler
+{
+    public static function handle(HttpKernelInterface $kernel, Request $request, $type, $catch): Response
+    {
+        // save global state related to trusted headers and proxies
+        $trustedProxies = Request::getTrustedProxies();
+        $trustedHeaderSet = Request::getTrustedHeaderSet();
+
+        // remove untrusted values
+        $remoteAddr = $request->server->get('REMOTE_ADDR');
+        if (!IpUtils::checkIp($remoteAddr, $trustedProxies)) {
+            $trustedHeaders = array(
+                'FORWARDED' => $trustedHeaderSet & Request::HEADER_FORWARDED,
+                'X_FORWARDED_FOR' => $trustedHeaderSet & Request::HEADER_X_FORWARDED_FOR,
+                'X_FORWARDED_HOST' => $trustedHeaderSet & Request::HEADER_X_FORWARDED_HOST,
+                'X_FORWARDED_PROTO' => $trustedHeaderSet & Request::HEADER_X_FORWARDED_PROTO,
+                'X_FORWARDED_PORT' => $trustedHeaderSet & Request::HEADER_X_FORWARDED_PORT,
+            );
+            foreach (array_filter($trustedHeaders) as $name => $key) {
+                $request->headers->remove($name);
+            }
+        }
+
+        // compute trusted values, taking any trusted proxies into account
+        $trustedIps = array();
+        $trustedValues = array();
+        foreach (array_reverse($request->getClientIps()) as $ip) {
+            $trustedIps[] = $ip;
+            $trustedValues[] = sprintf('for="%s"', $ip);
+        }
+        if ($ip !== $remoteAddr) {
+            $trustedIps[] = $remoteAddr;
+            $trustedValues[] = sprintf('for="%s"', $remoteAddr);
+        }
+
+        // set trusted values, reusing as much as possible the global trusted settings
+        if (Request::HEADER_FORWARDED & $trustedHeaderSet) {
+            $trustedValues[0] .= sprintf(';host="%s";proto=%s', $request->getHttpHost(), $request->getScheme());
+            $request->headers->set('Forwarded', implode(', ', $trustedValues));
+        }
+        if (Request::HEADER_X_FORWARDED_FOR & $trustedHeaderSet) {
+            $request->headers->set('X-Forwarded-For', implode(', ', $trustedIps));
+        } elseif (!(Request::HEADER_FORWARDED & $trustedHeaderSet)) {
+            Request::setTrustedProxies($trustedProxies, $trustedHeaderSet | Request::HEADER_X_FORWARDED_FOR);
+            $request->headers->set('X-Forwarded-For', implode(', ', $trustedIps));
+        }
+
+        // fix the client IP address by setting it to 127.0.0.1,
+        // which is the core responsibility of this method
+        $request->server->set('REMOTE_ADDR', '127.0.0.1');
+
+        // ensure 127.0.0.1 is set as trusted proxy
+        if (!IpUtils::checkIp('127.0.0.1', $trustedProxies)) {
+            Request::setTrustedProxies(array_merge($trustedProxies, array('127.0.0.1')), Request::getTrustedHeaderSet());
+        }
+
+        try {
+            return $kernel->handle($request, $type, $catch);
+        } finally {
+            // restore global state
+            Request::setTrustedProxies($trustedProxies, $trustedHeaderSet);
+        }
+    }
+}
diff --git a/src/Symfony/Component/HttpKernel/HttpKernel.php b/src/Symfony/Component/HttpKernel/HttpKernel.php
index d4ef09e8478f..06d210056c99 100644
--- a/src/Symfony/Component/HttpKernel/HttpKernel.php
+++ b/src/Symfony/Component/HttpKernel/HttpKernel.php
@@ -11,13 +11,15 @@
 
 namespace Symfony\Component\HttpKernel;
 
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Controller\ArgumentResolver;
 use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
 use Symfony\Component\HttpKernel\Event\FilterControllerArgumentsEvent;
-use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
 use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
@@ -25,11 +27,9 @@
 use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
 use Symfony\Component\HttpKernel\Event\PostResponseEvent;
-use Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\RequestStack;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
 /**
  * HttpKernel notifies events to convert a Request object to a Response one.
@@ -250,11 +250,11 @@ private function handleException(\Exception $e, Request $request, int $type): Re
 
     private function varToString($var): string
     {
-        if (is_object($var)) {
-            return sprintf('Object(%s)', get_class($var));
+        if (\is_object($var)) {
+            return sprintf('Object(%s)', \get_class($var));
         }
 
-        if (is_array($var)) {
+        if (\is_array($var)) {
             $a = array();
             foreach ($var as $k => $v) {
                 $a[] = sprintf('%s => %s', $k, $this->varToString($v));
@@ -263,7 +263,7 @@ private function varToString($var): string
             return sprintf('Array(%s)', implode(', ', $a));
         }
 
-        if (is_resource($var)) {
+        if (\is_resource($var)) {
             return sprintf('Resource(%s)', get_resource_type($var));
         }
 
diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index 1ef4e8af9510..7e75a9e0c410 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -13,28 +13,28 @@
 
 use Symfony\Bridge\ProxyManager\LazyProxy\Instantiator\RuntimeInstantiator;
 use Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\ProxyDumper;
+use Symfony\Component\Config\ConfigCache;
+use Symfony\Component\Config\Loader\DelegatingLoader;
+use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\PassConfig;
-use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Dumper\PhpDumper;
-use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
-use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+use Symfony\Component\DependencyInjection\Loader\ClosureLoader;
+use Symfony\Component\DependencyInjection\Loader\DirectoryLoader;
+use Symfony\Component\DependencyInjection\Loader\GlobFileLoader;
 use Symfony\Component\DependencyInjection\Loader\IniFileLoader;
 use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
-use Symfony\Component\DependencyInjection\Loader\GlobFileLoader;
-use Symfony\Component\DependencyInjection\Loader\DirectoryLoader;
-use Symfony\Component\DependencyInjection\Loader\ClosureLoader;
+use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Bundle\BundleInterface;
 use Symfony\Component\HttpKernel\Config\FileLocator;
-use Symfony\Component\HttpKernel\DependencyInjection\MergeExtensionConfigurationPass;
 use Symfony\Component\HttpKernel\DependencyInjection\AddAnnotatedClassesToCachePass;
-use Symfony\Component\Config\Loader\LoaderResolver;
-use Symfony\Component\Config\Loader\DelegatingLoader;
-use Symfony\Component\Config\ConfigCache;
+use Symfony\Component\HttpKernel\DependencyInjection\MergeExtensionConfigurationPass;
 
 /**
  * The Kernel is the heart of the Symfony system.
@@ -63,11 +63,11 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
     private $requestStackSize = 0;
     private $resetServices = false;
 
-    const VERSION = '4.0.13';
-    const VERSION_ID = 40013;
+    const VERSION = '4.0.14';
+    const VERSION_ID = 40014;
     const MAJOR_VERSION = 4;
     const MINOR_VERSION = 0;
-    const RELEASE_VERSION = 13;
+    const RELEASE_VERSION = 14;
     const EXTRA_VERSION = '';
 
     const END_OF_MAINTENANCE = '07/2018';
@@ -215,7 +215,7 @@ public function getBundles()
     public function getBundle($name)
     {
         if (!isset($this->bundles[$name])) {
-            throw new \InvalidArgumentException(sprintf('Bundle "%s" does not exist or it is not enabled. Maybe you forgot to add it in the registerBundles() method of your %s.php file?', $name, get_class($this)));
+            throw new \InvalidArgumentException(sprintf('Bundle "%s" does not exist or it is not enabled. Maybe you forgot to add it in the registerBundles() method of your %s.php file?', $name, \get_class($this)));
         }
 
         return $this->bundles[$name];
@@ -268,7 +268,7 @@ public function locateResource($name, $dir = null, $first = true)
             $resourceBundle = $bundle->getName();
         }
 
-        if (count($files) > 0) {
+        if (\count($files) > 0) {
             return $first && $isResource ? $files[0] : $files;
         }
 
@@ -313,7 +313,7 @@ public function getRootDir()
     {
         if (null === $this->rootDir) {
             $r = new \ReflectionObject($this);
-            $this->rootDir = dirname($r->getFileName());
+            $this->rootDir = \dirname($r->getFileName());
         }
 
         return $this->rootDir;
@@ -328,12 +328,12 @@ public function getProjectDir()
     {
         if (null === $this->projectDir) {
             $r = new \ReflectionObject($this);
-            $dir = $rootDir = dirname($r->getFileName());
+            $dir = $rootDir = \dirname($r->getFileName());
             while (!file_exists($dir.'/composer.json')) {
-                if ($dir === dirname($dir)) {
+                if ($dir === \dirname($dir)) {
                     return $this->projectDir = $rootDir;
                 }
-                $dir = dirname($dir);
+                $dir = \dirname($dir);
             }
             $this->projectDir = $dir;
         }
@@ -473,7 +473,7 @@ protected function initializeContainer()
 
         if ($this->debug) {
             $collectedLogs = array();
-            $previousHandler = defined('PHPUNIT_COMPOSER_INSTALL');
+            $previousHandler = \defined('PHPUNIT_COMPOSER_INSTALL');
             $previousHandler = $previousHandler ?: set_error_handler(function ($type, $message, $file, $line) use (&$collectedLogs, &$previousHandler) {
                 if (E_USER_DEPRECATED !== $type && E_DEPRECATED !== $type) {
                     return $previousHandler ? $previousHandler($type, $message, $file, $line) : false;
@@ -489,7 +489,7 @@ protected function initializeContainer()
                 // Clean the trace by removing first frames added by the error handler itself.
                 for ($i = 0; isset($backtrace[$i]); ++$i) {
                     if (isset($backtrace[$i]['file'], $backtrace[$i]['line']) && $backtrace[$i]['line'] === $line && $backtrace[$i]['file'] === $file) {
-                        $backtrace = array_slice($backtrace, 1 + $i);
+                        $backtrace = \array_slice($backtrace, 1 + $i);
                         break;
                     }
                 }
@@ -528,20 +528,20 @@ protected function initializeContainer()
                 error_reporting($errorLevel);
             }
         }
-        $oldContainer = is_object($oldContainer) ? new \ReflectionClass($oldContainer) : false;
+        $oldContainer = \is_object($oldContainer) ? new \ReflectionClass($oldContainer) : false;
 
         $this->dumpContainer($cache, $container, $class, $this->getContainerBaseClass());
         $this->container = require $cache->getPath();
         $this->container->set('kernel', $this);
 
-        if ($oldContainer && get_class($this->container) !== $oldContainer->name) {
+        if ($oldContainer && \get_class($this->container) !== $oldContainer->name) {
             // Because concurrent requests might still be using them,
             // old container files are not removed immediately,
             // but on a next dump of the container.
             static $legacyContainers = array();
-            $oldContainerDir = dirname($oldContainer->getFileName());
+            $oldContainerDir = \dirname($oldContainer->getFileName());
             $legacyContainers[$oldContainerDir.'.legacy'] = true;
-            foreach (glob(dirname($oldContainerDir).DIRECTORY_SEPARATOR.'*.legacy') as $legacyContainer) {
+            foreach (glob(\dirname($oldContainerDir).\DIRECTORY_SEPARATOR.'*.legacy') as $legacyContainer) {
                 if (!isset($legacyContainers[$legacyContainer]) && @unlink($legacyContainer)) {
                     (new Filesystem())->remove(substr($legacyContainer, 0, -7));
                 }
@@ -566,7 +566,7 @@ protected function getKernelParameters()
         $bundlesMetadata = array();
 
         foreach ($this->bundles as $name => $bundle) {
-            $bundles[$name] = get_class($bundle);
+            $bundles[$name] = \get_class($bundle);
             $bundlesMetadata[$name] = array(
                 'path' => $bundle->getPath(),
                 'namespace' => $bundle->getNamespace(),
@@ -697,14 +697,14 @@ protected function dumpContainer(ConfigCache $cache, ContainerBuilder $container
         ));
 
         $rootCode = array_pop($content);
-        $dir = dirname($cache->getPath()).'/';
+        $dir = \dirname($cache->getPath()).'/';
         $fs = new Filesystem();
 
         foreach ($content as $file => $code) {
             $fs->dumpFile($dir.$file, $code);
             @chmod($dir.$file, 0666 & ~umask());
         }
-        @unlink(dirname($dir.$file).'.legacy');
+        @unlink(\dirname($dir.$file).'.legacy');
 
         $cache->write($rootCode, $container->getResources());
     }
@@ -742,7 +742,7 @@ protected function getContainerLoader(ContainerInterface $container)
      */
     public static function stripComments($source)
     {
-        if (!function_exists('token_get_all')) {
+        if (!\function_exists('token_get_all')) {
             return $source;
         }
 
@@ -770,7 +770,7 @@ public static function stripComments($source)
 
                 // replace multiple new lines with a single newline
                 $rawChunk .= preg_replace(array('/\n{2,}/S'), "\n", $token[1]);
-            } elseif (in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
+            } elseif (\in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
                 $ignoreSpace = true;
             } else {
                 $rawChunk .= $token[1];
diff --git a/src/Symfony/Component/HttpKernel/KernelInterface.php b/src/Symfony/Component/HttpKernel/KernelInterface.php
index 925e37b071fb..b99040781927 100644
--- a/src/Symfony/Component/HttpKernel/KernelInterface.php
+++ b/src/Symfony/Component/HttpKernel/KernelInterface.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\HttpKernel;
 
+use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpKernel\Bundle\BundleInterface;
-use Symfony\Component\Config\Loader\LoaderInterface;
 
 /**
  * The Kernel is the heart of the Symfony system.
diff --git a/src/Symfony/Component/HttpKernel/Log/Logger.php b/src/Symfony/Component/HttpKernel/Log/Logger.php
index bf6ab49232fa..8b671d84dfd8 100644
--- a/src/Symfony/Component/HttpKernel/Log/Logger.php
+++ b/src/Symfony/Component/HttpKernel/Log/Logger.php
@@ -58,7 +58,7 @@ public function __construct(string $minLevel = null, $output = 'php://stderr', c
 
         $this->minLevelIndex = self::$levels[$minLevel];
         $this->formatter = $formatter ?: array($this, 'format');
-        if (false === $this->handle = is_resource($output) ? $output : @fopen($output, 'a')) {
+        if (false === $this->handle = \is_resource($output) ? $output : @fopen($output, 'a')) {
             throw new InvalidArgumentException(sprintf('Unable to open "%s".', $output));
         }
     }
diff --git a/src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php b/src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php
index d78411d3f6b7..b95c6eeacd68 100644
--- a/src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php
+++ b/src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php
@@ -59,7 +59,7 @@ public function find($ip, $url, $limit, $method, $start = null, $end = null, $st
         fseek($file, 0, SEEK_END);
 
         $result = array();
-        while (count($result) < $limit && $line = $this->readLineFromFile($file)) {
+        while (\count($result) < $limit && $line = $this->readLineFromFile($file)) {
             $values = str_getcsv($line);
             list($csvToken, $csvIp, $csvMethod, $csvUrl, $csvTime, $csvParent, $csvStatusCode) = $values;
             $csvTime = (int) $csvTime;
@@ -134,7 +134,7 @@ public function write(Profile $profile)
         $profileIndexed = is_file($file);
         if (!$profileIndexed) {
             // Create directory
-            $dir = dirname($file);
+            $dir = \dirname($file);
             if (!is_dir($dir) && false === @mkdir($dir, 0777, true) && !is_dir($dir)) {
                 throw new \RuntimeException(sprintf('Unable to create the storage directory (%s).', $dir));
             }
diff --git a/src/Symfony/Component/HttpKernel/Profiler/Profiler.php b/src/Symfony/Component/HttpKernel/Profiler/Profiler.php
index 9152e9927767..caade137a29f 100644
--- a/src/Symfony/Component/HttpKernel/Profiler/Profiler.php
+++ b/src/Symfony/Component/HttpKernel/Profiler/Profiler.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\HttpKernel\Profiler;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\DataCollector\DataCollectorInterface;
 use Symfony\Component\HttpKernel\DataCollector\LateDataCollectorInterface;
-use Psr\Log\LoggerInterface;
 
 /**
  * Profiler.
@@ -100,7 +100,7 @@ public function saveProfile(Profile $profile)
         }
 
         if (!($ret = $this->storage->write($profile)) && null !== $this->logger) {
-            $this->logger->warning('Unable to store the profiler information.', array('configured_storage' => get_class($this->storage)));
+            $this->logger->warning('Unable to store the profiler information.', array('configured_storage' => \get_class($this->storage)));
         }
 
         return $ret;
diff --git a/src/Symfony/Component/HttpKernel/Tests/CacheClearer/Psr6CacheClearerTest.php b/src/Symfony/Component/HttpKernel/Tests/CacheClearer/Psr6CacheClearerTest.php
index 588fd3007e46..e1d2fe82e979 100644
--- a/src/Symfony/Component/HttpKernel/Tests/CacheClearer/Psr6CacheClearerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/CacheClearer/Psr6CacheClearerTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpKernel\Tests\CacheClearer;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\CacheClearer\Psr6CacheClearer;
 use Psr\Cache\CacheItemPoolInterface;
+use Symfony\Component\HttpKernel\CacheClearer\Psr6CacheClearer;
 
 class Psr6CacheClearerTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/CacheWarmer/CacheWarmerTest.php b/src/Symfony/Component/HttpKernel/Tests/CacheWarmer/CacheWarmerTest.php
index 05666cb0dcdc..4d34e7bfc90e 100644
--- a/src/Symfony/Component/HttpKernel/Tests/CacheWarmer/CacheWarmerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/CacheWarmer/CacheWarmerTest.php
@@ -31,7 +31,7 @@ public static function tearDownAfterClass()
     public function testWriteCacheFileCreatesTheFile()
     {
         $warmer = new TestCacheWarmer(self::$cacheFile);
-        $warmer->warmUp(dirname(self::$cacheFile));
+        $warmer->warmUp(\dirname(self::$cacheFile));
 
         $this->assertFileExists(self::$cacheFile);
     }
@@ -43,7 +43,7 @@ public function testWriteNonWritableCacheFileThrowsARuntimeException()
     {
         $nonWritableFile = '/this/file/is/very/probably/not/writable';
         $warmer = new TestCacheWarmer($nonWritableFile);
-        $warmer->warmUp(dirname($nonWritableFile));
+        $warmer->warmUp(\dirname($nonWritableFile));
     }
 }
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/ClientTest.php b/src/Symfony/Component/HttpKernel/Tests/ClientTest.php
index b774d8ec7ae1..5af273086820 100644
--- a/src/Symfony/Component/HttpKernel/Tests/ClientTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/ClientTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\HttpKernel\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\Client;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\HttpFoundation\Cookie;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+use Symfony\Component\HttpKernel\Client;
 use Symfony\Component\HttpKernel\Tests\Fixtures\TestClient;
 
 /**
@@ -120,7 +120,7 @@ public function testUploadedFile()
             $this->assertTrue($file->isValid());
         }
 
-        $file->move(dirname($target), basename($target));
+        $file->move(\dirname($target), basename($target));
 
         $this->assertFileExists($target);
         unlink($target);
diff --git a/src/Symfony/Component/HttpKernel/Tests/Controller/ArgumentResolverTest.php b/src/Symfony/Component/HttpKernel/Tests/Controller/ArgumentResolverTest.php
index 6a5926f85c7e..bb4e06617ecd 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Controller/ArgumentResolverTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Controller/ArgumentResolverTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\HttpKernel\Tests\Controller;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
 use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
@@ -23,7 +24,6 @@
 use Symfony\Component\HttpKernel\Tests\Fixtures\Controller\ExtendingSession;
 use Symfony\Component\HttpKernel\Tests\Fixtures\Controller\NullableController;
 use Symfony\Component\HttpKernel\Tests\Fixtures\Controller\VariadicController;
-use Symfony\Component\HttpFoundation\Request;
 
 class ArgumentResolverTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/Controller/ContainerControllerResolverTest.php b/src/Symfony/Component/HttpKernel/Tests/Controller/ContainerControllerResolverTest.php
index 1602de4c261f..a9c19fbee094 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Controller/ContainerControllerResolverTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Controller/ContainerControllerResolverTest.php
@@ -38,7 +38,7 @@ public function testGetControllerService()
 
         $controller = $resolver->getController($request);
 
-        $this->assertInstanceOf(get_class($this), $controller[0]);
+        $this->assertInstanceOf(\get_class($this), $controller[0]);
         $this->assertSame('controllerMethod1', $controller[1]);
     }
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php b/src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php
index 203a162fa815..62e3975ab8bc 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\Controller\ControllerResolver;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Controller\ControllerResolver;
 
 class ControllerResolverTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/ConfigDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/ConfigDataCollectorTest.php
index 4fb36afda227..a99e34ad4288 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/ConfigDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/ConfigDataCollectorTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\HttpKernel\Tests\DataCollector;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\DataCollector\ConfigDataCollector;
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\ConfigDataCollector;
+use Symfony\Component\HttpKernel\Kernel;
 
 class ConfigDataCollectorTest extends TestCase
 {
@@ -38,9 +38,9 @@ public function testCollect()
         $this->assertSame(date_default_timezone_get(), $c->getPhpTimezone());
         $this->assertSame(Kernel::VERSION, $c->getSymfonyVersion());
         $this->assertNull($c->getToken());
-        $this->assertSame(extension_loaded('xdebug'), $c->hasXDebug());
-        $this->assertSame(extension_loaded('Zend OPcache') && ini_get('opcache.enable'), $c->hasZendOpcache());
-        $this->assertSame(extension_loaded('apcu') && ini_get('apc.enabled'), $c->hasApcu());
+        $this->assertSame(\extension_loaded('xdebug'), $c->hasXDebug());
+        $this->assertSame(\extension_loaded('Zend OPcache') && ini_get('opcache.enable'), $c->hasZendOpcache());
+        $this->assertSame(\extension_loaded('apcu') && ini_get('apc.enabled'), $c->hasApcu());
     }
 }
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
index d809331cb099..fd5ea11e720b 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpKernel\Tests\DataCollector;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\DataCollector\DumpDataCollector;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\DumpDataCollector;
 use Symfony\Component\VarDumper\Cloner\Data;
 use Symfony\Component\VarDumper\Dumper\CliDumper;
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/ExceptionDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/ExceptionDataCollectorTest.php
index 178f1f01a3fc..1e8d186cc31f 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/ExceptionDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/ExceptionDataCollectorTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Debug\Exception\FlattenException;
-use Symfony\Component\HttpKernel\DataCollector\ExceptionDataCollector;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\ExceptionDataCollector;
 
 class ExceptionDataCollectorTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/MemoryDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/MemoryDataCollectorTest.php
index ab78e9e8e178..1435d05e83c3 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/MemoryDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/MemoryDataCollectorTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpKernel\Tests\DataCollector;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\DataCollector\MemoryDataCollector;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\MemoryDataCollector;
 
 class MemoryDataCollectorTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/RequestDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/RequestDataCollectorTest.php
index 69bef76d4135..cce08e27c4cc 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/RequestDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/RequestDataCollectorTest.php
@@ -12,20 +12,20 @@
 namespace Symfony\Component\HttpKernel\Tests\DataCollector;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpFoundation\Cookie;
 use Symfony\Component\HttpFoundation\ParameterBag;
 use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
 use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
+use Symfony\Component\HttpKernel\DataCollector\RequestDataCollector;
+use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\HttpKernel;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\HttpKernel\DataCollector\RequestDataCollector;
-use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\Cookie;
-use Symfony\Component\EventDispatcher\EventDispatcher;
 
 class RequestDataCollectorTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/TimeDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/TimeDataCollectorTest.php
index 8048cc37a5fd..cf6a86695d77 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/TimeDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/TimeDataCollectorTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpKernel\Tests\DataCollector;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\DataCollector\TimeDataCollector;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\TimeDataCollector;
 
 /**
  * @group time-sensitive
diff --git a/src/Symfony/Component/HttpKernel/Tests/Debug/FileLinkFormatterTest.php b/src/Symfony/Component/HttpKernel/Tests/Debug/FileLinkFormatterTest.php
index d616098a545c..e14780ac687f 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Debug/FileLinkFormatterTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Debug/FileLinkFormatterTest.php
@@ -27,7 +27,7 @@ public function testWhenNoFileLinkFormatAndNoRequest()
 
     public function testWhenFileLinkFormatAndNoRequest()
     {
-        $file = __DIR__.DIRECTORY_SEPARATOR.'file.php';
+        $file = __DIR__.\DIRECTORY_SEPARATOR.'file.php';
 
         $sut = new FileLinkFormatter('debug://open?url=file://%f&line=%l', new RequestStack());
 
@@ -36,7 +36,7 @@ public function testWhenFileLinkFormatAndNoRequest()
 
     public function testWhenFileLinkFormatAndRequest()
     {
-        $file = __DIR__.DIRECTORY_SEPARATOR.'file.php';
+        $file = __DIR__.\DIRECTORY_SEPARATOR.'file.php';
         $baseDir = __DIR__;
         $requestStack = new RequestStack();
         $request = new Request();
@@ -49,7 +49,7 @@ public function testWhenFileLinkFormatAndRequest()
 
     public function testWhenNoFileLinkFormatAndRequest()
     {
-        $file = __DIR__.DIRECTORY_SEPARATOR.'file.php';
+        $file = __DIR__.\DIRECTORY_SEPARATOR.'file.php';
         $requestStack = new RequestStack();
         $request = new Request();
         $requestStack->push($request);
diff --git a/src/Symfony/Component/HttpKernel/Tests/Debug/TraceableEventDispatcherTest.php b/src/Symfony/Component/HttpKernel/Tests/Debug/TraceableEventDispatcherTest.php
index aaa82d524cc6..3de147c7f79f 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Debug/TraceableEventDispatcherTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Debug/TraceableEventDispatcherTest.php
@@ -13,11 +13,11 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher;
 use Symfony\Component\HttpKernel\HttpKernel;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Stopwatch\Stopwatch;
 
 class TraceableEventDispatcherTest extends TestCase
diff --git a/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/LazyLoadingFragmentHandlerTest.php b/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/LazyLoadingFragmentHandlerTest.php
index 7e664954dd6d..2bc84a53c859 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/LazyLoadingFragmentHandlerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/LazyLoadingFragmentHandlerTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpKernel\Tests\DependencyInjection;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\DependencyInjection\LazyLoadingFragmentHandler;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DependencyInjection\LazyLoadingFragmentHandler;
 
 class LazyLoadingFragmentHandlerTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/LoggerPassTest.php b/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/LoggerPassTest.php
index b199e11dabe7..cb504877cdc4 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/LoggerPassTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/LoggerPassTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Psr\Log\LoggerInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\DependencyInjection\LoggerPass;
 use Symfony\Component\HttpKernel\Log\Logger;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * @author Kévin Dunglas <dunglas@gmail.com>
diff --git a/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/RegisterControllerArgumentLocatorsPassTest.php b/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/RegisterControllerArgumentLocatorsPassTest.php
index 4016deb4ab29..ca121c732711 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/RegisterControllerArgumentLocatorsPassTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DependencyInjection/RegisterControllerArgumentLocatorsPassTest.php
@@ -13,13 +13,14 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
+use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceLocator;
 use Symfony\Component\DependencyInjection\TypedReference;
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\HttpKernel\DependencyInjection\RegisterControllerArgumentLocatorsPass;
 
 class RegisterControllerArgumentLocatorsPassTest extends TestCase
@@ -326,6 +327,29 @@ public function testDoNotBindScalarValueToControllerArgument()
         $locator = $container->getDefinition((string) $resolver->getArgument(0))->getArgument(0);
         $this->assertEmpty($locator);
     }
+
+    public function testBindingsOnChildDefinitions()
+    {
+        $container = new ContainerBuilder();
+        $resolver = $container->register('argument_resolver.service')->addArgument(array());
+
+        $container->register('parent', ArgumentWithoutTypeController::class);
+
+        $container->setDefinition('child', (new ChildDefinition('parent'))
+            ->setBindings(array('$someArg' => new Reference('parent')))
+            ->addTag('controller.service_arguments')
+        );
+
+        $pass = new RegisterControllerArgumentLocatorsPass();
+        $pass->process($container);
+
+        $locator = $container->getDefinition((string) $resolver->getArgument(0))->getArgument(0);
+        $this->assertInstanceOf(ServiceClosureArgument::class, $locator['child:fooAction']);
+
+        $locator = $container->getDefinition((string) $locator['child:fooAction']->getValues()[0])->getArgument(0);
+        $this->assertInstanceOf(ServiceClosureArgument::class, $locator['someArg']);
+        $this->assertEquals(new Reference('parent'), $locator['someArg']->getValues()[0]);
+    }
 }
 
 class RegisterTestController
diff --git a/src/Symfony/Component/HttpKernel/Tests/Event/FilterControllerArgumentsEventTest.php b/src/Symfony/Component/HttpKernel/Tests/Event/FilterControllerArgumentsEventTest.php
index 9165d31f24a1..f1e440b2fc71 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Event/FilterControllerArgumentsEventTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Event/FilterControllerArgumentsEventTest.php
@@ -2,9 +2,9 @@
 
 namespace Symfony\Component\HttpKernel\Tests\Event;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Event\FilterControllerArgumentsEvent;
-use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpKernel\Tests\TestHttpKernel;
 
 class FilterControllerArgumentsEventTest extends TestCase
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/AddRequestFormatsListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/AddRequestFormatsListenerTest.php
index f4878f626f05..3ffb9f3d632e 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/AddRequestFormatsListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/AddRequestFormatsListenerTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\HttpKernel\Tests\EventListener;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\EventListener\AddRequestFormatsListener;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\EventListener\AddRequestFormatsListener;
 use Symfony\Component\HttpKernel\KernelEvents;
 
 /**
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/DebugHandlersListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/DebugHandlersListenerTest.php
index 467b8dde8849..9a9c17edab52 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/DebugHandlersListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/DebugHandlersListenerTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Psr\Log\LogLevel;
-use Symfony\Component\Console\Event\ConsoleEvent;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\ConsoleEvents;
+use Symfony\Component\Console\Event\ConsoleEvent;
 use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Input\ArgvInput;
 use Symfony\Component\Console\Output\ConsoleOutput;
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/ExceptionListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/ExceptionListenerTest.php
index 3cb0b298bb07..0b73075e7b89 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/ExceptionListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/ExceptionListenerTest.php
@@ -13,14 +13,14 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
 use Symfony\Component\HttpKernel\EventListener\ExceptionListener;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Log\DebugLoggerInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Tests\Logger;
 
 /**
@@ -37,9 +37,9 @@ public function testConstruct()
         $logger = new TestLogger();
         $l = new ExceptionListener('foo', $logger);
 
-        $_logger = new \ReflectionProperty(get_class($l), 'logger');
+        $_logger = new \ReflectionProperty(\get_class($l), 'logger');
         $_logger->setAccessible(true);
-        $_controller = new \ReflectionProperty(get_class($l), 'controller');
+        $_controller = new \ReflectionProperty(\get_class($l), 'controller');
         $_controller->setAccessible(true);
 
         $this->assertSame($logger, $_logger->getValue($l));
@@ -157,7 +157,7 @@ class TestLogger extends Logger implements DebugLoggerInterface
 {
     public function countErrors()
     {
-        return count($this->logs['critical']);
+        return \count($this->logs['critical']);
     }
 }
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/FragmentListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/FragmentListenerTest.php
index 464b2ab462f1..edf0498265c8 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/FragmentListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/FragmentListenerTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\HttpKernel\Tests\EventListener;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\EventListener\FragmentListener;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\EventListener\FragmentListener;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\UriSigner;
 
 class FragmentListenerTest extends TestCase
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/LocaleListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/LocaleListenerTest.php
index 332393eead2f..f442235ad048 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/LocaleListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/LocaleListenerTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\EventListener\LocaleListener;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 
 class LocaleListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/ProfilerListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/ProfilerListenerTest.php
index 751aee8695f3..526b3aa75dcf 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/ProfilerListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/ProfilerListenerTest.php
@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\RequestStack;
-use Symfony\Component\HttpKernel\EventListener\ProfilerListener;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
 use Symfony\Component\HttpKernel\Event\PostResponseEvent;
+use Symfony\Component\HttpKernel\EventListener\ProfilerListener;
 use Symfony\Component\HttpKernel\Exception\HttpException;
 use Symfony\Component\HttpKernel\Kernel;
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/ResponseListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/ResponseListenerTest.php
index 12a31eb3eeed..1d8960267dbe 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/ResponseListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/ResponseListenerTest.php
@@ -12,13 +12,13 @@
 namespace Symfony\Component\HttpKernel\Tests\EventListener;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\EventListener\ResponseListener;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\EventListener\ResponseListener;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\EventDispatcher\EventDispatcher;
 
 class ResponseListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/RouterListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/RouterListenerTest.php
index 2668ede8e8e4..92e727296578 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/RouterListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/RouterListenerTest.php
@@ -18,12 +18,12 @@
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Controller\ArgumentResolver;
 use Symfony\Component\HttpKernel\Controller\ControllerResolver;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\EventListener\ExceptionListener;
 use Symfony\Component\HttpKernel\EventListener\RouterListener;
 use Symfony\Component\HttpKernel\EventListener\ValidateRequestListener;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\HttpKernel;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\Routing\Exception\NoConfigurationException;
 use Symfony\Component\Routing\RequestContext;
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/SessionListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/SessionListenerTest.php
index a6416e7f693d..1b95d19f9c25 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/SessionListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/SessionListenerTest.php
@@ -16,9 +16,9 @@
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Session\Session;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\EventListener\AbstractSessionListener;
 use Symfony\Component\HttpKernel\EventListener\SessionListener;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/SurrogateListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/SurrogateListenerTest.php
index 1e79ebe05239..b955c07d4742 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/SurrogateListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/SurrogateListenerTest.php
@@ -12,14 +12,14 @@
 namespace Symfony\Component\HttpKernel\Tests\EventListener;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\HttpCache\Esi;
-use Symfony\Component\HttpKernel\EventListener\SurrogateListener;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
-use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\HttpKernel\EventListener\SurrogateListener;
+use Symfony\Component\HttpKernel\HttpCache\Esi;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpKernel\KernelEvents;
 
 class SurrogateListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/TestSessionListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/TestSessionListenerTest.php
index 01f0a3b8641a..0d0985ca5daf 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/TestSessionListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/TestSessionListenerTest.php
@@ -13,14 +13,14 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\ServiceSubscriberInterface;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\Session\SessionInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\EventListener\SessionListener;
 use Symfony\Component\HttpKernel\EventListener\TestSessionListener;
-use Symfony\Component\HttpFoundation\Session\SessionInterface;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * SessionListenerTest.
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/ValidateRequestListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/ValidateRequestListenerTest.php
index 801660318016..bdab742ce182 100644
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/ValidateRequestListenerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/EventListener/ValidateRequestListenerTest.php
@@ -14,8 +14,8 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\EventListener\ValidateRequestListener;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\EventListener\ValidateRequestListener;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fixtures/123/Kernel123.php b/src/Symfony/Component/HttpKernel/Tests/Fixtures/123/Kernel123.php
index b6cf1cba20e7..d3a76684dfa2 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fixtures/123/Kernel123.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fixtures/123/Kernel123.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Tests\Fixtures\_123;
 
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\HttpKernel\Kernel;
 
 class Kernel123 extends Kernel
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForOverrideName.php b/src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForOverrideName.php
index a1102ab7843c..f7baaa6325fb 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForOverrideName.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForOverrideName.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Tests\Fixtures;
 
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\HttpKernel\Kernel;
 
 class KernelForOverrideName extends Kernel
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForTest.php b/src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForTest.php
index 5fd61bbc7e7c..9acee4cac553 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fixtures/KernelForTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpKernel\Tests\Fixtures;
 
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\HttpKernel\Kernel;
 
 class KernelForTest extends Kernel
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fragment/EsiFragmentRendererTest.php b/src/Symfony/Component/HttpKernel/Tests/Fragment/EsiFragmentRendererTest.php
index 8a40dcd5bb89..7ac1f4faa537 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fragment/EsiFragmentRendererTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fragment/EsiFragmentRendererTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\HttpKernel\Tests\Fragment;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
 use Symfony\Component\HttpKernel\Fragment\EsiFragmentRenderer;
 use Symfony\Component\HttpKernel\HttpCache\Esi;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\UriSigner;
 
 class EsiFragmentRendererTest extends TestCase
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fragment/FragmentHandlerTest.php b/src/Symfony/Component/HttpKernel/Tests/Fragment/FragmentHandlerTest.php
index 9c906b50a0be..a296aa0e183c 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fragment/FragmentHandlerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fragment/FragmentHandlerTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpKernel\Tests\Fragment;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
 
 /**
  * @group time-sensitive
@@ -88,7 +88,7 @@ protected function getHandler($returnValue, $arguments = array())
         ;
 
         if ($arguments) {
-            call_user_func_array(array($e, 'with'), $arguments);
+            \call_user_func_array(array($e, 'with'), $arguments);
         }
 
         $handler = new FragmentHandler($this->requestStack);
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fragment/HIncludeFragmentRendererTest.php b/src/Symfony/Component/HttpKernel/Tests/Fragment/HIncludeFragmentRendererTest.php
index 7171c71bc3af..10fbccf0fa20 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fragment/HIncludeFragmentRendererTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fragment/HIncludeFragmentRendererTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\HttpKernel\Tests\Fragment;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
 use Symfony\Component\HttpKernel\Fragment\HIncludeFragmentRenderer;
 use Symfony\Component\HttpKernel\UriSigner;
-use Symfony\Component\HttpFoundation\Request;
 
 class HIncludeFragmentRendererTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php b/src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php
index 03a72e80579d..91552a1b54c8 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php
@@ -12,14 +12,14 @@
 namespace Symfony\Component\HttpKernel\Tests\Fragment;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
-use Symfony\Component\HttpKernel\HttpKernel;
 use Symfony\Component\HttpKernel\Fragment\InlineFragmentRenderer;
+use Symfony\Component\HttpKernel\HttpKernel;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\EventDispatcher\EventDispatcher;
 
 class InlineFragmentRendererTest extends TestCase
 {
@@ -44,7 +44,7 @@ public function testRenderWithObjectsAsAttributes()
         $subRequest = Request::create('/_fragment?_path=_format%3Dhtml%26_locale%3Den%26_controller%3Dmain_controller');
         $subRequest->attributes->replace(array('object' => $object, '_format' => 'html', '_controller' => 'main_controller', '_locale' => 'en'));
         $subRequest->headers->set('x-forwarded-for', array('127.0.0.1'));
-        $subRequest->server->set('HTTP_X_FORWARDED_FOR', '127.0.0.1');
+        $subRequest->headers->set('forwarded', array('for="127.0.0.1";host="localhost";proto=http'));
 
         $strategy = new InlineFragmentRenderer($this->getKernelExpectingRequest($subRequest));
 
@@ -55,7 +55,10 @@ public function testRenderWithTrustedHeaderDisabled()
     {
         Request::setTrustedProxies(array(), 0);
 
-        $strategy = new InlineFragmentRenderer($this->getKernelExpectingRequest(Request::create('/')));
+        $expectedSubRequest = Request::create('/');
+        $expectedSubRequest->headers->set('x-forwarded-for', array('127.0.0.1'));
+
+        $strategy = new InlineFragmentRenderer($this->getKernelExpectingRequest($expectedSubRequest));
         $this->assertSame('foo', $strategy->render('/', Request::create('/'))->getContent());
 
         Request::setTrustedProxies(array(), -1);
@@ -146,8 +149,8 @@ public function testESIHeaderIsKeptInSubrequest()
 
         if (Request::HEADER_X_FORWARDED_FOR & Request::getTrustedHeaderSet()) {
             $expectedSubRequest->headers->set('x-forwarded-for', array('127.0.0.1'));
-            $expectedSubRequest->server->set('HTTP_X_FORWARDED_FOR', '127.0.0.1');
         }
+        $expectedSubRequest->headers->set('forwarded', array('for="127.0.0.1";host="localhost";proto=http'));
 
         $strategy = new InlineFragmentRenderer($this->getKernelExpectingRequest($expectedSubRequest));
 
@@ -158,7 +161,7 @@ public function testESIHeaderIsKeptInSubrequest()
 
     public function testESIHeaderIsKeptInSubrequestWithTrustedHeaderDisabled()
     {
-        Request::setTrustedProxies(array(), 0);
+        Request::setTrustedProxies(array(), Request::HEADER_FORWARDED);
 
         $this->testESIHeaderIsKeptInSubrequest();
 
@@ -169,7 +172,7 @@ public function testHeadersPossiblyResultingIn304AreNotAssignedToSubrequest()
     {
         $expectedSubRequest = Request::create('/');
         $expectedSubRequest->headers->set('x-forwarded-for', array('127.0.0.1'));
-        $expectedSubRequest->server->set('HTTP_X_FORWARDED_FOR', '127.0.0.1');
+        $expectedSubRequest->headers->set('forwarded', array('for="127.0.0.1";host="localhost";proto=http'));
 
         $strategy = new InlineFragmentRenderer($this->getKernelExpectingRequest($expectedSubRequest));
         $request = Request::create('/', 'GET', array(), array(), array(), array('HTTP_IF_MODIFIED_SINCE' => 'Fri, 01 Jan 2016 00:00:00 GMT', 'HTTP_IF_NONE_MATCH' => '*'));
@@ -182,9 +185,28 @@ public function testFirstTrustedProxyIsSetAsRemote()
 
         $expectedSubRequest = Request::create('/');
         $expectedSubRequest->headers->set('Surrogate-Capability', 'abc="ESI/1.0"');
-        $expectedSubRequest->server->set('REMOTE_ADDR', '1.1.1.1');
+        $expectedSubRequest->server->set('REMOTE_ADDR', '127.0.0.1');
+        $expectedSubRequest->headers->set('x-forwarded-for', array('127.0.0.1'));
+        $expectedSubRequest->headers->set('forwarded', array('for="127.0.0.1";host="localhost";proto=http'));
+
+        $strategy = new InlineFragmentRenderer($this->getKernelExpectingRequest($expectedSubRequest));
+
+        $request = Request::create('/');
+        $request->headers->set('Surrogate-Capability', 'abc="ESI/1.0"');
+        $strategy->render('/', $request);
+
+        Request::setTrustedProxies(array(), -1);
+    }
+
+    public function testIpAddressOfRangedTrustedProxyIsSetAsRemote()
+    {
+        $expectedSubRequest = Request::create('/');
+        $expectedSubRequest->headers->set('Surrogate-Capability', 'abc="ESI/1.0"');
+        $expectedSubRequest->server->set('REMOTE_ADDR', '127.0.0.1');
         $expectedSubRequest->headers->set('x-forwarded-for', array('127.0.0.1'));
-        $expectedSubRequest->server->set('HTTP_X_FORWARDED_FOR', '127.0.0.1');
+        $expectedSubRequest->headers->set('forwarded', array('for="127.0.0.1";host="localhost";proto=http'));
+
+        Request::setTrustedProxies(array('1.1.1.1/24'), -1);
 
         $strategy = new InlineFragmentRenderer($this->getKernelExpectingRequest($expectedSubRequest));
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fragment/SsiFragmentRendererTest.php b/src/Symfony/Component/HttpKernel/Tests/Fragment/SsiFragmentRendererTest.php
index b537625f2401..f725803118f7 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fragment/SsiFragmentRendererTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fragment/SsiFragmentRendererTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\HttpKernel\Tests\Fragment;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Controller\ControllerReference;
 use Symfony\Component\HttpKernel\Fragment\SsiFragmentRenderer;
 use Symfony\Component\HttpKernel\HttpCache\Ssi;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\UriSigner;
 
 class SsiFragmentRendererTest extends TestCase
diff --git a/src/Symfony/Component/HttpKernel/Tests/HttpCache/EsiTest.php b/src/Symfony/Component/HttpKernel/Tests/HttpCache/EsiTest.php
index a8662b2a2b44..863ad76147fc 100644
--- a/src/Symfony/Component/HttpKernel/Tests/HttpCache/EsiTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/HttpCache/EsiTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\HttpKernel\Tests\HttpCache;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\HttpCache\Esi;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpCache\Esi;
 
 class EsiTest extends TestCase
 {
@@ -231,10 +231,10 @@ protected function getCache($request, $response)
               ->method('getRequest')
               ->will($this->returnValue($request))
         ;
-        if (is_array($response)) {
+        if (\is_array($response)) {
             $cache->expects($this->any())
                   ->method('handle')
-                  ->will(call_user_func_array(array($this, 'onConsecutiveCalls'), $response))
+                  ->will(\call_user_func_array(array($this, 'onConsecutiveCalls'), $response))
             ;
         } else {
             $cache->expects($this->any())
diff --git a/src/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTest.php b/src/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTest.php
index 0a77648003a3..a41d8665083c 100644
--- a/src/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTest.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\HttpKernel\Tests\HttpCache;
 
-use Symfony\Component\HttpKernel\HttpCache\Esi;
-use Symfony\Component\HttpKernel\HttpCache\HttpCache;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpCache\Esi;
+use Symfony\Component\HttpKernel\HttpCache\HttpCache;
 use Symfony\Component\HttpKernel\HttpCache\Store;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 
@@ -215,7 +215,7 @@ public function testValidatesPrivateResponsesCachedOnTheClient()
             if ($request->cookies->has('authenticated')) {
                 $response->headers->set('Cache-Control', 'private, no-store');
                 $response->setETag('"private tag"');
-                if (in_array('"private tag"', $etags)) {
+                if (\in_array('"private tag"', $etags)) {
                     $response->setStatusCode(304);
                 } else {
                     $response->setStatusCode(200);
@@ -225,7 +225,7 @@ public function testValidatesPrivateResponsesCachedOnTheClient()
             } else {
                 $response->headers->set('Cache-Control', 'public');
                 $response->setETag('"public tag"');
-                if (in_array('"public tag"', $etags)) {
+                if (\in_array('"public tag"', $etags)) {
                     $response->setStatusCode(304);
                 } else {
                     $response->setStatusCode(200);
@@ -566,7 +566,7 @@ public function testHitsCachedResponseWithMaxAgeDirective()
 
     public function testDegradationWhenCacheLocked()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Skips on windows to avoid permissions issues.');
         }
 
@@ -994,7 +994,7 @@ public function testUsesCacheToRespondToHeadRequestsWhenFresh()
         $this->assertHttpKernelIsNotCalled();
         $this->assertEquals(200, $this->response->getStatusCode());
         $this->assertEquals('', $this->response->getContent());
-        $this->assertEquals(strlen('Hello World'), $this->response->headers->get('Content-Length'));
+        $this->assertEquals(\strlen('Hello World'), $this->response->headers->get('Content-Length'));
     }
 
     public function testSendsNoContentWhenFresh()
@@ -1338,20 +1338,27 @@ public function testClientIpIsAlwaysLocalhostForForwardedRequests()
         $this->setNextResponse();
         $this->request('GET', '/', array('REMOTE_ADDR' => '10.0.0.1'));
 
-        $this->assertEquals('127.0.0.1', $this->kernel->getBackendRequest()->server->get('REMOTE_ADDR'));
+        $this->kernel->assert(function ($backendRequest) {
+            $this->assertSame('127.0.0.1', $backendRequest->server->get('REMOTE_ADDR'));
+        });
     }
 
     /**
      * @dataProvider getTrustedProxyData
      */
-    public function testHttpCacheIsSetAsATrustedProxy(array $existing, array $expected)
+    public function testHttpCacheIsSetAsATrustedProxy(array $existing)
     {
         Request::setTrustedProxies($existing, Request::HEADER_X_FORWARDED_ALL);
 
         $this->setNextResponse();
         $this->request('GET', '/', array('REMOTE_ADDR' => '10.0.0.1'));
+        $this->assertSame($existing, Request::getTrustedProxies());
 
-        $this->assertEquals($expected, Request::getTrustedProxies());
+        $existing = array_unique(array_merge($existing, array('127.0.0.1')));
+        $this->kernel->assert(function ($backendRequest) use ($existing) {
+            $this->assertSame($existing, Request::getTrustedProxies());
+            $this->assertsame('10.0.0.1', $backendRequest->getClientIp());
+        });
 
         Request::setTrustedProxies(array(), -1);
     }
@@ -1359,45 +1366,41 @@ public function testHttpCacheIsSetAsATrustedProxy(array $existing, array $expect
     public function getTrustedProxyData()
     {
         return array(
-            array(array(), array('127.0.0.1')),
-            array(array('10.0.0.2'), array('10.0.0.2', '127.0.0.1')),
-            array(array('10.0.0.2', '127.0.0.1'), array('10.0.0.2', '127.0.0.1')),
+            array(array()),
+            array(array('10.0.0.2')),
+            array(array('10.0.0.2', '127.0.0.1')),
         );
     }
 
     /**
-     * @dataProvider getXForwardedForData
+     * @dataProvider getForwardedData
      */
-    public function testXForwarderForHeaderForForwardedRequests($xForwardedFor, $expected)
+    public function testForwarderHeaderForForwardedRequests($forwarded, $expected)
     {
         $this->setNextResponse();
         $server = array('REMOTE_ADDR' => '10.0.0.1');
-        if (false !== $xForwardedFor) {
-            $server['HTTP_X_FORWARDED_FOR'] = $xForwardedFor;
+        if (null !== $forwarded) {
+            Request::setTrustedProxies($server, -1);
+            $server['HTTP_FORWARDED'] = $forwarded;
         }
         $this->request('GET', '/', $server);
 
-        $this->assertEquals($expected, $this->kernel->getBackendRequest()->headers->get('X-Forwarded-For'));
+        $this->kernel->assert(function ($backendRequest) use ($expected) {
+            $this->assertSame($expected, $backendRequest->headers->get('Forwarded'));
+        });
+
+        Request::setTrustedProxies(array(), -1);
     }
 
-    public function getXForwardedForData()
+    public function getForwardedData()
     {
         return array(
-            array(false, '10.0.0.1'),
-            array('10.0.0.2', '10.0.0.2, 10.0.0.1'),
-            array('10.0.0.2, 10.0.0.3', '10.0.0.2, 10.0.0.3, 10.0.0.1'),
+            array(null, 'for="10.0.0.1";host="localhost";proto=http'),
+            array('for=10.0.0.2', 'for="10.0.0.2";host="localhost";proto=http, for="10.0.0.1"'),
+            array('for=10.0.0.2, for=10.0.0.3', 'for="10.0.0.2";host="localhost";proto=http, for="10.0.0.3", for="10.0.0.1"'),
         );
     }
 
-    public function testXForwarderForHeaderForPassRequests()
-    {
-        $this->setNextResponse();
-        $server = array('REMOTE_ADDR' => '10.0.0.1');
-        $this->request('POST', '/', $server);
-
-        $this->assertEquals('10.0.0.1', $this->kernel->getBackendRequest()->headers->get('X-Forwarded-For'));
-    }
-
     public function testEsiCacheRemoveValidationHeadersIfEmbeddedResponses()
     {
         $time = \DateTime::createFromFormat('U', time());
diff --git a/src/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTestCase.php b/src/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTestCase.php
index ed5c690d60bc..b3aa2be2f0bc 100644
--- a/src/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTestCase.php
+++ b/src/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTestCase.php
@@ -168,7 +168,7 @@ public static function clearDirectory($directory)
 
         $fp = opendir($directory);
         while (false !== $file = readdir($fp)) {
-            if (!in_array($file, array('.', '..'))) {
+            if (!\in_array($file, array('.', '..'))) {
                 if (is_link($directory.'/'.$file)) {
                     unlink($directory.'/'.$file);
                 } elseif (is_dir($directory.'/'.$file)) {
diff --git a/src/Symfony/Component/HttpKernel/Tests/HttpCache/SsiTest.php b/src/Symfony/Component/HttpKernel/Tests/HttpCache/SsiTest.php
index 1079d37a2770..26ef6cb2b8e6 100644
--- a/src/Symfony/Component/HttpKernel/Tests/HttpCache/SsiTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/HttpCache/SsiTest.php
@@ -198,10 +198,10 @@ protected function getCache($request, $response)
               ->method('getRequest')
               ->will($this->returnValue($request))
         ;
-        if (is_array($response)) {
+        if (\is_array($response)) {
             $cache->expects($this->any())
                   ->method('handle')
-                  ->will(call_user_func_array(array($this, 'onConsecutiveCalls'), $response))
+                  ->will(\call_user_func_array(array($this, 'onConsecutiveCalls'), $response))
             ;
         } else {
             $cache->expects($this->any())
diff --git a/src/Symfony/Component/HttpKernel/Tests/HttpCache/SubRequestHandlerTest.php b/src/Symfony/Component/HttpKernel/Tests/HttpCache/SubRequestHandlerTest.php
new file mode 100644
index 000000000000..dfe0a734bf9f
--- /dev/null
+++ b/src/Symfony/Component/HttpKernel/Tests/HttpCache/SubRequestHandlerTest.php
@@ -0,0 +1,153 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Tests\HttpCache;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpCache\SubRequestHandler;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+class SubRequestHandlerTest extends TestCase
+{
+    private static $globalState;
+
+    protected function setUp()
+    {
+        self::$globalState = $this->getGlobalState();
+    }
+
+    protected function tearDown()
+    {
+        Request::setTrustedProxies(self::$globalState[0], self::$globalState[1]);
+    }
+
+    public function testTrustedHeadersAreKept()
+    {
+        Request::setTrustedProxies(array('10.0.0.1'), -1);
+        $globalState = $this->getGlobalState();
+
+        $request = Request::create('/');
+        $request->server->set('REMOTE_ADDR', '10.0.0.1');
+        $request->headers->set('X-Forwarded-For', '10.0.0.2');
+        $request->headers->set('X-Forwarded-Host', 'Good');
+        $request->headers->set('X-Forwarded-Port', '1234');
+        $request->headers->set('X-Forwarded-Proto', 'https');
+
+        $kernel = new TestSubRequestHandlerKernel(function ($request, $type, $catch) {
+            $this->assertSame('127.0.0.1', $request->server->get('REMOTE_ADDR'));
+            $this->assertSame('10.0.0.2', $request->getClientIp());
+            $this->assertSame('Good', $request->headers->get('X-Forwarded-Host'));
+            $this->assertSame('1234', $request->headers->get('X-Forwarded-Port'));
+            $this->assertSame('https', $request->headers->get('X-Forwarded-Proto'));
+        });
+
+        SubRequestHandler::handle($kernel, $request, HttpKernelInterface::MASTER_REQUEST, true);
+
+        $this->assertSame($globalState, $this->getGlobalState());
+    }
+
+    public function testUntrustedHeadersAreRemoved()
+    {
+        $request = Request::create('/');
+        $request->server->set('REMOTE_ADDR', '10.0.0.1');
+        $request->headers->set('X-Forwarded-For', '10.0.0.2');
+        $request->headers->set('X-Forwarded-Host', 'Evil');
+        $request->headers->set('X-Forwarded-Port', '1234');
+        $request->headers->set('X-Forwarded-Proto', 'http');
+        $request->headers->set('Forwarded', 'Evil2');
+
+        $kernel = new TestSubRequestHandlerKernel(function ($request, $type, $catch) {
+            $this->assertSame('127.0.0.1', $request->server->get('REMOTE_ADDR'));
+            $this->assertSame('10.0.0.1', $request->getClientIp());
+            $this->assertFalse($request->headers->has('X-Forwarded-Host'));
+            $this->assertFalse($request->headers->has('X-Forwarded-Port'));
+            $this->assertFalse($request->headers->has('X-Forwarded-Proto'));
+            $this->assertSame('for="10.0.0.1";host="localhost";proto=http', $request->headers->get('Forwarded'));
+        });
+
+        SubRequestHandler::handle($kernel, $request, HttpKernelInterface::MASTER_REQUEST, true);
+
+        $this->assertSame(self::$globalState, $this->getGlobalState());
+    }
+
+    public function testTrustedForwardedHeader()
+    {
+        Request::setTrustedProxies(array('10.0.0.1'), -1);
+        $globalState = $this->getGlobalState();
+
+        $request = Request::create('/');
+        $request->server->set('REMOTE_ADDR', '10.0.0.1');
+        $request->headers->set('Forwarded', 'for="10.0.0.2";host="foo.bar:1234";proto=https');
+
+        $kernel = new TestSubRequestHandlerKernel(function ($request, $type, $catch) {
+            $this->assertSame('127.0.0.1', $request->server->get('REMOTE_ADDR'));
+            $this->assertSame('10.0.0.2', $request->getClientIp());
+            $this->assertSame('foo.bar:1234', $request->getHttpHost());
+            $this->assertSame('https', $request->getScheme());
+            $this->assertSame(1234, $request->getPort());
+        });
+
+        SubRequestHandler::handle($kernel, $request, HttpKernelInterface::MASTER_REQUEST, true);
+
+        $this->assertSame($globalState, $this->getGlobalState());
+    }
+
+    public function testTrustedXForwardedForHeader()
+    {
+        Request::setTrustedProxies(array('10.0.0.1'), -1);
+        $globalState = $this->getGlobalState();
+
+        $request = Request::create('/');
+        $request->server->set('REMOTE_ADDR', '10.0.0.1');
+        $request->headers->set('X-Forwarded-For', '10.0.0.2');
+        $request->headers->set('X-Forwarded-Host', 'foo.bar');
+        $request->headers->set('X-Forwarded-Proto', 'https');
+
+        $kernel = new TestSubRequestHandlerKernel(function ($request, $type, $catch) {
+            $this->assertSame('127.0.0.1', $request->server->get('REMOTE_ADDR'));
+            $this->assertSame('10.0.0.2', $request->getClientIp());
+            $this->assertSame('foo.bar', $request->getHttpHost());
+            $this->assertSame('https', $request->getScheme());
+        });
+
+        SubRequestHandler::handle($kernel, $request, HttpKernelInterface::MASTER_REQUEST, true);
+
+        $this->assertSame($globalState, $this->getGlobalState());
+    }
+
+    private function getGlobalState()
+    {
+        return array(
+            Request::getTrustedProxies(),
+            Request::getTrustedHeaderSet(),
+        );
+    }
+}
+
+class TestSubRequestHandlerKernel implements HttpKernelInterface
+{
+    private $assertCallback;
+
+    public function __construct(\Closure $assertCallback)
+    {
+        $this->assertCallback = $assertCallback;
+    }
+
+    public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = true)
+    {
+        $assertCallback = $this->assertCallback;
+        $assertCallback($request, $type, $catch);
+
+        return new Response();
+    }
+}
diff --git a/src/Symfony/Component/HttpKernel/Tests/HttpCache/TestHttpKernel.php b/src/Symfony/Component/HttpKernel/Tests/HttpCache/TestHttpKernel.php
index 946c7a31cb44..5dbf02c9922d 100644
--- a/src/Symfony/Component/HttpKernel/Tests/HttpCache/TestHttpKernel.php
+++ b/src/Symfony/Component/HttpKernel/Tests/HttpCache/TestHttpKernel.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\HttpKernel\Tests\HttpCache;
 
-use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
-use Symfony\Component\HttpKernel\HttpKernel;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
-use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpKernel\HttpKernel;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 class TestHttpKernel extends HttpKernel implements ControllerResolverInterface, ArgumentResolverInterface
 {
@@ -39,15 +39,25 @@ public function __construct($body, $status, $headers, \Closure $customizer = nul
         parent::__construct(new EventDispatcher(), $this, null, $this);
     }
 
-    public function getBackendRequest()
+    public function assert(\Closure $callback)
     {
-        return $this->backendRequest;
+        $trustedConfig = array(Request::getTrustedProxies(), Request::getTrustedHeaderSet());
+
+        list($trustedProxies, $trustedHeaderSet, $backendRequest) = $this->backendRequest;
+        Request::setTrustedProxies($trustedProxies, $trustedHeaderSet);
+
+        try {
+            $callback($backendRequest);
+        } finally {
+            list($trustedProxies, $trustedHeaderSet) = $trustedConfig;
+            Request::setTrustedProxies($trustedProxies, $trustedHeaderSet);
+        }
     }
 
     public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = false)
     {
         $this->catch = $catch;
-        $this->backendRequest = $request;
+        $this->backendRequest = array(Request::getTrustedProxies(), Request::getTrustedHeaderSet(), $request);
 
         return parent::handle($request, $type, $catch);
     }
diff --git a/src/Symfony/Component/HttpKernel/Tests/HttpCache/TestMultipleHttpKernel.php b/src/Symfony/Component/HttpKernel/Tests/HttpCache/TestMultipleHttpKernel.php
index 926d8daf5311..712132bd13f3 100644
--- a/src/Symfony/Component/HttpKernel/Tests/HttpCache/TestMultipleHttpKernel.php
+++ b/src/Symfony/Component/HttpKernel/Tests/HttpCache/TestMultipleHttpKernel.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\HttpKernel\Tests\HttpCache;
 
-use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
-use Symfony\Component\HttpKernel\HttpKernel;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
-use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpKernel\HttpKernel;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 class TestMultipleHttpKernel extends HttpKernel implements ControllerResolverInterface, ArgumentResolverInterface
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/HttpKernelTest.php b/src/Symfony/Component/HttpKernel/Tests/HttpKernelTest.php
index c2ea04b3ab99..c5326a33407c 100644
--- a/src/Symfony/Component/HttpKernel/Tests/HttpKernelTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/HttpKernelTest.php
@@ -12,21 +12,21 @@
 namespace Symfony\Component\HttpKernel\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
 use Symfony\Component\HttpKernel\Event\FilterControllerArgumentsEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
 use Symfony\Component\HttpKernel\HttpKernel;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
-use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\RedirectResponse;
-use Symfony\Component\EventDispatcher\EventDispatcher;
 
 class HttpKernelTest extends TestCase
 {
@@ -265,7 +265,7 @@ public function testHandleAllowChangingControllerAndArguments()
             $oldArguments = $event->getArguments();
 
             $newController = function ($id) use ($oldController, $oldArguments) {
-                $response = call_user_func_array($oldController, $oldArguments);
+                $response = \call_user_func_array($oldController, $oldArguments);
 
                 $response->headers->set('X-Id', $id);
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
index 5a302d3090cf..8926f20878c5 100644
--- a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
@@ -16,15 +16,15 @@
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Bundle\BundleInterface;
 use Symfony\Component\HttpKernel\DependencyInjection\ResettableServicePass;
 use Symfony\Component\HttpKernel\DependencyInjection\ServicesResetter;
-use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpKernel\Tests\Fixtures\KernelForTest;
+use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\HttpKernel\Tests\Fixtures\KernelForOverrideName;
+use Symfony\Component\HttpKernel\Tests\Fixtures\KernelForTest;
 use Symfony\Component\HttpKernel\Tests\Fixtures\KernelWithoutBundles;
 use Symfony\Component\HttpKernel\Tests\Fixtures\ResettableService;
 
@@ -74,7 +74,7 @@ public function testInitializeContainerClearsOldContainers()
         $kernel = new CustomProjectDirKernel();
         $kernel->boot();
 
-        $containerDir = __DIR__.'/Fixtures/cache/custom/'.substr(get_class($kernel->getContainer()), 0, 16);
+        $containerDir = __DIR__.'/Fixtures/cache/custom/'.substr(\get_class($kernel->getContainer()), 0, 16);
         $this->assertTrue(unlink(__DIR__.'/Fixtures/cache/custom/FixturesCustomDebugProjectContainer.php.meta'));
         $this->assertFileExists($containerDir);
         $this->assertFileNotExists($containerDir.'.legacy');
@@ -287,7 +287,7 @@ public function doStuff()
 
         // Heredocs are preserved, making the output mixing Unix and Windows line
         // endings, switching to "\n" everywhere on Windows to avoid failure.
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $expected = str_replace("\r\n", "\n", $expected);
             $output = str_replace("\r\n", "\n", $output);
         }
@@ -299,7 +299,7 @@ public function testGetRootDir()
     {
         $kernel = new KernelForTest('test', true);
 
-        $this->assertEquals(__DIR__.DIRECTORY_SEPARATOR.'Fixtures', realpath($kernel->getRootDir()));
+        $this->assertEquals(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures', realpath($kernel->getRootDir()));
     }
 
     public function testGetName()
@@ -530,7 +530,7 @@ public function testKernelReset()
         $kernel = new CustomProjectDirKernel();
         $kernel->boot();
 
-        $containerClass = get_class($kernel->getContainer());
+        $containerClass = \get_class($kernel->getContainer());
         $containerFile = (new \ReflectionClass($kernel->getContainer()))->getFileName();
         unlink(__DIR__.'/Fixtures/cache/custom/FixturesCustomDebugProjectContainer.php.meta');
 
@@ -546,7 +546,7 @@ public function testKernelReset()
 
         $this->assertNotInstanceOf($containerClass, $kernel->getContainer());
         $this->assertFileExists($containerFile);
-        $this->assertFileExists(dirname($containerFile).'.legacy');
+        $this->assertFileExists(\dirname($containerFile).'.legacy');
     }
 
     public function testKernelPass()
@@ -626,7 +626,7 @@ protected function getBundle($dir = null, $parent = null, $className = null, $bu
         $bundle
             ->expects($this->any())
             ->method('getName')
-            ->will($this->returnValue(null === $bundleName ? get_class($bundle) : $bundleName))
+            ->will($this->returnValue(null === $bundleName ? \get_class($bundle) : $bundleName))
         ;
 
         $bundle
diff --git a/src/Symfony/Component/HttpKernel/Tests/Log/LoggerTest.php b/src/Symfony/Component/HttpKernel/Tests/Log/LoggerTest.php
index ecf67af78c11..a5d070c8a750 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Log/LoggerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Log/LoggerTest.php
@@ -34,7 +34,7 @@ class LoggerTest extends TestCase
 
     protected function setUp()
     {
-        $this->tmpFile = sys_get_temp_dir().DIRECTORY_SEPARATOR.'log';
+        $this->tmpFile = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'log';
         $this->logger = new Logger(LogLevel::DEBUG, $this->tmpFile);
     }
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/Profiler/ProfilerTest.php b/src/Symfony/Component/HttpKernel/Tests/Profiler/ProfilerTest.php
index 2d5f0ca5ad59..cff133c1aaa7 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Profiler/ProfilerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Profiler/ProfilerTest.php
@@ -12,12 +12,12 @@
 namespace Symfony\Component\HttpKernel\Tests\Profiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\DataCollector\DataCollectorInterface;
 use Symfony\Component\HttpKernel\DataCollector\RequestDataCollector;
 use Symfony\Component\HttpKernel\Profiler\FileProfilerStorage;
 use Symfony\Component\HttpKernel\Profiler\Profiler;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
 
 class ProfilerTest extends TestCase
 {
diff --git a/src/Symfony/Component/HttpKernel/Tests/TestHttpKernel.php b/src/Symfony/Component/HttpKernel/Tests/TestHttpKernel.php
index 3ec59272541a..fb95aa033b14 100644
--- a/src/Symfony/Component/HttpKernel/Tests/TestHttpKernel.php
+++ b/src/Symfony/Component/HttpKernel/Tests/TestHttpKernel.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\HttpKernel\Tests;
 
-use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
-use Symfony\Component\HttpKernel\HttpKernel;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
-use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpKernel\HttpKernel;
 
 class TestHttpKernel extends HttpKernel implements ControllerResolverInterface, ArgumentResolverInterface
 {
diff --git a/src/Symfony/Component/HttpKernel/composer.json b/src/Symfony/Component/HttpKernel/composer.json
index e3d54e51a111..372ec7efa745 100644
--- a/src/Symfony/Component/HttpKernel/composer.json
+++ b/src/Symfony/Component/HttpKernel/composer.json
@@ -28,7 +28,7 @@
         "symfony/config": "~3.4|~4.0",
         "symfony/console": "~3.4|~4.0",
         "symfony/css-selector": "~3.4|~4.0",
-        "symfony/dependency-injection": "^3.4.5|^4.0.5",
+        "symfony/dependency-injection": "^3.4.10|^4.0.10",
         "symfony/dom-crawler": "~3.4|~4.0",
         "symfony/expression-language": "~3.4|~4.0",
         "symfony/finder": "~3.4|~4.0",
@@ -45,7 +45,7 @@
     },
     "conflict": {
         "symfony/config": "<3.4",
-        "symfony/dependency-injection": "<3.4.5|<4.0.5,>=4",
+        "symfony/dependency-injection": "<3.4.10|<4.0.10,>=4",
         "symfony/var-dumper": "<3.4",
         "twig/twig": "<1.34|<2.4,>=2"
     },
diff --git a/src/Symfony/Component/Inflector/Inflector.php b/src/Symfony/Component/Inflector/Inflector.php
index cf685159a7f4..b670b22dcddc 100644
--- a/src/Symfony/Component/Inflector/Inflector.php
+++ b/src/Symfony/Component/Inflector/Inflector.php
@@ -163,7 +163,7 @@ public static function singularize(string $plural)
     {
         $pluralRev = strrev($plural);
         $lowerPluralRev = strtolower($pluralRev);
-        $pluralLength = strlen($lowerPluralRev);
+        $pluralLength = \strlen($lowerPluralRev);
 
         // The outer loop iterates over the entries of the plural table
         // The inner loop $j iterates over the characters of the plural suffix
@@ -206,7 +206,7 @@ public static function singularize(string $plural)
                     // the singular suffix too
                     $firstUpper = ctype_upper($pluralRev[$j - 1]);
 
-                    if (is_array($newSuffix)) {
+                    if (\is_array($newSuffix)) {
                         $singulars = array();
 
                         foreach ($newSuffix as $newSuffixEntry) {
diff --git a/src/Symfony/Component/Inflector/Tests/InflectorTest.php b/src/Symfony/Component/Inflector/Tests/InflectorTest.php
index be7836736f8b..8c40532a268d 100644
--- a/src/Symfony/Component/Inflector/Tests/InflectorTest.php
+++ b/src/Symfony/Component/Inflector/Tests/InflectorTest.php
@@ -161,9 +161,9 @@ public function singularizeProvider()
     public function testSingularize($plural, $singular)
     {
         $single = Inflector::singularize($plural);
-        if (is_string($singular) && is_array($single)) {
+        if (\is_string($singular) && \is_array($single)) {
             $this->fail("--- Expected\n`string`: ".$singular."\n+++ Actual\n`array`: ".implode(', ', $single));
-        } elseif (is_array($singular) && is_string($single)) {
+        } elseif (\is_array($singular) && \is_string($single)) {
             $this->fail("--- Expected\n`array`: ".implode(', ', $singular)."\n+++ Actual\n`string`: ".$single);
         }
 
diff --git a/src/Symfony/Component/Intl/Collator/Collator.php b/src/Symfony/Component/Intl/Collator/Collator.php
index 3caf48a2de19..69934de32d8d 100644
--- a/src/Symfony/Component/Intl/Collator/Collator.php
+++ b/src/Symfony/Component/Intl/Collator/Collator.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Intl\Collator;
 
-use Symfony\Component\Intl\Exception\MethodNotImplementedException;
 use Symfony\Component\Intl\Exception\MethodArgumentValueNotImplementedException;
+use Symfony\Component\Intl\Exception\MethodNotImplementedException;
 use Symfony\Component\Intl\Globals\IntlGlobals;
 use Symfony\Component\Intl\Locale\Locale;
 
diff --git a/src/Symfony/Component/Intl/Data/Bundle/Reader/BundleEntryReader.php b/src/Symfony/Component/Intl/Data/Bundle/Reader/BundleEntryReader.php
index aedcac918515..035166c1fb07 100644
--- a/src/Symfony/Component/Intl/Data/Bundle/Reader/BundleEntryReader.php
+++ b/src/Symfony/Component/Intl/Data/Bundle/Reader/BundleEntryReader.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Intl\Data\Bundle\Reader;
 
+use Symfony\Component\Intl\Data\Util\RecursiveArrayAccess;
 use Symfony\Component\Intl\Exception\MissingResourceException;
 use Symfony\Component\Intl\Exception\OutOfBoundsException;
 use Symfony\Component\Intl\Exception\ResourceBundleNotFoundException;
 use Symfony\Component\Intl\Locale;
-use Symfony\Component\Intl\Data\Util\RecursiveArrayAccess;
 
 /**
  * Default implementation of {@link BundleEntryReaderInterface}.
@@ -90,7 +90,7 @@ public function readEntry($path, $locale, array $indices, $fallback = true)
                 $readSucceeded = true;
 
                 $isCurrentTraversable = $currentEntry instanceof \Traversable;
-                $isCurrentMultiValued = $isCurrentTraversable || is_array($currentEntry);
+                $isCurrentMultiValued = $isCurrentTraversable || \is_array($currentEntry);
 
                 // Return immediately if fallback is disabled or we are dealing
                 // with a scalar non-null entry
@@ -162,7 +162,7 @@ public function readEntry($path, $locale, array $indices, $fallback = true)
         );
 
         // Append fallback locales, if any
-        if (count($testedLocales) > 1) {
+        if (\count($testedLocales) > 1) {
             // Remove original locale
             array_shift($testedLocales);
 
diff --git a/src/Symfony/Component/Intl/Data/Bundle/Reader/IntlBundleReader.php b/src/Symfony/Component/Intl/Data/Bundle/Reader/IntlBundleReader.php
index 375d3fe84658..3bcd98dc89e1 100644
--- a/src/Symfony/Component/Intl/Data/Bundle/Reader/IntlBundleReader.php
+++ b/src/Symfony/Component/Intl/Data/Bundle/Reader/IntlBundleReader.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Intl\Data\Bundle\Reader;
 
-use Symfony\Component\Intl\Exception\ResourceBundleNotFoundException;
 use Symfony\Component\Intl\Data\Util\ArrayAccessibleResourceBundle;
+use Symfony\Component\Intl\Exception\ResourceBundleNotFoundException;
 
 /**
  * Reads binary .res resource bundles.
diff --git a/src/Symfony/Component/Intl/Data/Bundle/Reader/JsonBundleReader.php b/src/Symfony/Component/Intl/Data/Bundle/Reader/JsonBundleReader.php
index 17a9df32c21a..b5786d12a22e 100644
--- a/src/Symfony/Component/Intl/Data/Bundle/Reader/JsonBundleReader.php
+++ b/src/Symfony/Component/Intl/Data/Bundle/Reader/JsonBundleReader.php
@@ -31,7 +31,7 @@ public function read($path, $locale)
         $fileName = $path.'/'.$locale.'.json';
 
         // prevent directory traversal attacks
-        if (dirname($fileName) !== $path) {
+        if (\dirname($fileName) !== $path) {
             throw new ResourceBundleNotFoundException(sprintf('The resource bundle "%s" does not exist.', $fileName));
         }
 
diff --git a/src/Symfony/Component/Intl/Data/Bundle/Reader/PhpBundleReader.php b/src/Symfony/Component/Intl/Data/Bundle/Reader/PhpBundleReader.php
index 0b66bb1a557c..7c4b71c93ac1 100644
--- a/src/Symfony/Component/Intl/Data/Bundle/Reader/PhpBundleReader.php
+++ b/src/Symfony/Component/Intl/Data/Bundle/Reader/PhpBundleReader.php
@@ -31,7 +31,7 @@ public function read($path, $locale)
         $fileName = $path.'/'.$locale.'.php';
 
         // prevent directory traversal attacks
-        if (dirname($fileName) !== $path) {
+        if (\dirname($fileName) !== $path) {
             throw new ResourceBundleNotFoundException(sprintf('The resource bundle "%s" does not exist.', $fileName));
         }
 
diff --git a/src/Symfony/Component/Intl/Data/Bundle/Writer/TextBundleWriter.php b/src/Symfony/Component/Intl/Data/Bundle/Writer/TextBundleWriter.php
index 20fad5347aed..309e4303b18e 100644
--- a/src/Symfony/Component/Intl/Data/Bundle/Writer/TextBundleWriter.php
+++ b/src/Symfony/Component/Intl/Data/Bundle/Writer/TextBundleWriter.php
@@ -72,7 +72,7 @@ private function writeResourceBundle($file, $bundleName, $value, $fallback)
      */
     private function writeResource($file, $value, $indentation, $requireBraces = true)
     {
-        if (is_int($value)) {
+        if (\is_int($value)) {
             $this->writeInteger($file, $value);
 
             return;
@@ -82,13 +82,13 @@ private function writeResource($file, $value, $indentation, $requireBraces = tru
             $value = iterator_to_array($value);
         }
 
-        if (is_array($value)) {
-            $intValues = count($value) === count(array_filter($value, 'is_int'));
+        if (\is_array($value)) {
+            $intValues = \count($value) === \count(array_filter($value, 'is_int'));
 
             $keys = array_keys($value);
 
             // check that the keys are 0-indexed and ascending
-            $intKeys = $keys === range(0, count($keys) - 1);
+            $intKeys = $keys === range(0, \count($keys) - 1);
 
             if ($intValues && $intKeys) {
                 $this->writeIntVector($file, $value, $indentation);
@@ -107,7 +107,7 @@ private function writeResource($file, $value, $indentation, $requireBraces = tru
             return;
         }
 
-        if (is_bool($value)) {
+        if (\is_bool($value)) {
             $value = $value ? 'true' : 'false';
         }
 
@@ -206,7 +206,7 @@ private function writeArray($file, array $value, $indentation)
      */
     private function writeTable($file, $value, $indentation, $fallback = true)
     {
-        if (!is_array($value) && !$value instanceof \Traversable) {
+        if (!\is_array($value) && !$value instanceof \Traversable) {
             throw new UnexpectedTypeException($value, 'array or \Traversable');
         }
 
diff --git a/src/Symfony/Component/Intl/Data/Generator/AbstractDataGenerator.php b/src/Symfony/Component/Intl/Data/Generator/AbstractDataGenerator.php
index d13596bc1783..9c6f1dcbc519 100644
--- a/src/Symfony/Component/Intl/Data/Generator/AbstractDataGenerator.php
+++ b/src/Symfony/Component/Intl/Data/Generator/AbstractDataGenerator.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Intl\Data\Generator;
 
 use Symfony\Component\Filesystem\Filesystem;
-use Symfony\Component\Intl\Data\Bundle\Reader\BundleReaderInterface;
-use Symfony\Component\Intl\Data\Util\LocaleScanner;
 use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
+use Symfony\Component\Intl\Data\Bundle\Reader\BundleReaderInterface;
 use Symfony\Component\Intl\Data\Bundle\Reader\IntlBundleReader;
+use Symfony\Component\Intl\Data\Util\LocaleScanner;
 
 /**
  * The rule for compiling the currency bundle.
diff --git a/src/Symfony/Component/Intl/Data/Generator/CurrencyDataGenerator.php b/src/Symfony/Component/Intl/Data/Generator/CurrencyDataGenerator.php
index bd186643457e..e657b3823637 100644
--- a/src/Symfony/Component/Intl/Data/Generator/CurrencyDataGenerator.php
+++ b/src/Symfony/Component/Intl/Data/Generator/CurrencyDataGenerator.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Intl\Data\Generator;
 
+use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
 use Symfony\Component\Intl\Data\Bundle\Reader\BundleReaderInterface;
 use Symfony\Component\Intl\Data\Util\ArrayAccessibleResourceBundle;
-use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
 use Symfony\Component\Intl\Data\Util\LocaleScanner;
 
 /**
diff --git a/src/Symfony/Component/Intl/Data/Generator/LanguageDataGenerator.php b/src/Symfony/Component/Intl/Data/Generator/LanguageDataGenerator.php
index 565a8726197a..ab09f1c6f131 100644
--- a/src/Symfony/Component/Intl/Data/Generator/LanguageDataGenerator.php
+++ b/src/Symfony/Component/Intl/Data/Generator/LanguageDataGenerator.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Intl\Data\Generator;
 
+use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
 use Symfony\Component\Intl\Data\Bundle\Reader\BundleReaderInterface;
 use Symfony\Component\Intl\Data\Util\ArrayAccessibleResourceBundle;
 use Symfony\Component\Intl\Data\Util\LocaleScanner;
 use Symfony\Component\Intl\Exception\RuntimeException;
-use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
 
 /**
  * The rule for compiling the language bundle.
@@ -169,7 +169,7 @@ private function generateAlpha2ToAlpha3Mapping(ArrayAccessibleResourceBundle $me
 
         foreach ($aliases as $alias => $language) {
             $language = $language['replacement'];
-            if (2 === strlen($language) && 3 === strlen($alias)) {
+            if (2 === \strlen($language) && 3 === \strlen($alias)) {
                 if (isset(self::$preferredAlpha2ToAlpha3Mapping[$language])) {
                     // Validate to prevent typos
                     if (!isset($aliases[self::$preferredAlpha2ToAlpha3Mapping[$language]])) {
diff --git a/src/Symfony/Component/Intl/Data/Generator/LocaleDataGenerator.php b/src/Symfony/Component/Intl/Data/Generator/LocaleDataGenerator.php
index c89ac337c447..01f0f742ea0e 100644
--- a/src/Symfony/Component/Intl/Data/Generator/LocaleDataGenerator.php
+++ b/src/Symfony/Component/Intl/Data/Generator/LocaleDataGenerator.php
@@ -106,7 +106,7 @@ public function generateData(GeneratorConfig $config)
             }
 
             // If no names remain to be saved for the current locale, skip it
-            if (0 === count($localeNames[$displayLocale])) {
+            if (0 === \count($localeNames[$displayLocale])) {
                 continue;
             }
 
@@ -147,7 +147,7 @@ private function generateLocaleName($locale, $displayLocale)
 
         // Currently the only available variant is POSIX, which we don't want
         // to include in the list
-        if (count($variants) > 0) {
+        if (\count($variants) > 0) {
             return;
         }
 
@@ -192,7 +192,7 @@ private function generateLocaleName($locale, $displayLocale)
             $extras[] = $regionName;
         }
 
-        if (count($extras) > 0) {
+        if (\count($extras) > 0) {
             // Remove any existing extras
             // For example, in German, zh_Hans is "Chinesisch (vereinfacht)".
             // The latter is the script part which is already included in the
@@ -219,7 +219,7 @@ private function generateFallbackMapping(array $displayLocales, array $aliases)
             while (null !== ($fallback = Locale::getFallback($fallback))) {
                 // Currently, no locale has an alias as fallback locale.
                 // If this starts to be the case, we need to add code here.
-                assert(!isset($aliases[$fallback]));
+                \assert(!isset($aliases[$fallback]));
 
                 // Check whether the fallback exists
                 if (isset($displayLocales[$fallback])) {
diff --git a/src/Symfony/Component/Intl/Data/Generator/RegionDataGenerator.php b/src/Symfony/Component/Intl/Data/Generator/RegionDataGenerator.php
index 7ae31bd121ff..e1265b3a1b74 100644
--- a/src/Symfony/Component/Intl/Data/Generator/RegionDataGenerator.php
+++ b/src/Symfony/Component/Intl/Data/Generator/RegionDataGenerator.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Intl\Data\Generator;
 
+use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
 use Symfony\Component\Intl\Data\Bundle\Reader\BundleReaderInterface;
 use Symfony\Component\Intl\Data\Util\ArrayAccessibleResourceBundle;
-use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
 use Symfony\Component\Intl\Data\Util\LocaleScanner;
 
 /**
@@ -140,7 +140,7 @@ protected function generateRegionNames(ArrayAccessibleResourceBundle $localeBund
             }
 
             // WORLD/CONTINENT/SUBCONTINENT/GROUPING
-            if (ctype_digit($region) || is_int($region)) {
+            if (ctype_digit($region) || \is_int($region)) {
                 continue;
             }
 
diff --git a/src/Symfony/Component/Intl/Data/Generator/ScriptDataGenerator.php b/src/Symfony/Component/Intl/Data/Generator/ScriptDataGenerator.php
index 81390a7621e9..7ba6bbe69298 100644
--- a/src/Symfony/Component/Intl/Data/Generator/ScriptDataGenerator.php
+++ b/src/Symfony/Component/Intl/Data/Generator/ScriptDataGenerator.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Intl\Data\Generator;
 
-use Symfony\Component\Intl\Data\Bundle\Reader\BundleReaderInterface;
 use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
+use Symfony\Component\Intl\Data\Bundle\Reader\BundleReaderInterface;
 use Symfony\Component\Intl\Data\Util\LocaleScanner;
 
 /**
diff --git a/src/Symfony/Component/Intl/Data/Provider/CurrencyDataProvider.php b/src/Symfony/Component/Intl/Data/Provider/CurrencyDataProvider.php
index 61bc4fa9175f..fa54e752c43c 100644
--- a/src/Symfony/Component/Intl/Data/Provider/CurrencyDataProvider.php
+++ b/src/Symfony/Component/Intl/Data/Provider/CurrencyDataProvider.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Intl\Data\Provider;
 
+use Symfony\Component\Intl\Data\Bundle\Reader\BundleEntryReaderInterface;
 use Symfony\Component\Intl\Exception\MissingResourceException;
 use Symfony\Component\Intl\Locale;
-use Symfony\Component\Intl\Data\Bundle\Reader\BundleEntryReaderInterface;
 
 /**
  * Data provider for currency-related data.
diff --git a/src/Symfony/Component/Intl/Data/Provider/LanguageDataProvider.php b/src/Symfony/Component/Intl/Data/Provider/LanguageDataProvider.php
index 4a64937782b0..d733dcd8c004 100644
--- a/src/Symfony/Component/Intl/Data/Provider/LanguageDataProvider.php
+++ b/src/Symfony/Component/Intl/Data/Provider/LanguageDataProvider.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Intl\Data\Provider;
 
-use Symfony\Component\Intl\Locale;
 use Symfony\Component\Intl\Data\Bundle\Reader\BundleEntryReaderInterface;
+use Symfony\Component\Intl\Locale;
 
 /**
  * Data provider for language-related ICU data.
diff --git a/src/Symfony/Component/Intl/Data/Util/RecursiveArrayAccess.php b/src/Symfony/Component/Intl/Data/Util/RecursiveArrayAccess.php
index ff4d2f777ca1..086b55047805 100644
--- a/src/Symfony/Component/Intl/Data/Util/RecursiveArrayAccess.php
+++ b/src/Symfony/Component/Intl/Data/Util/RecursiveArrayAccess.php
@@ -24,7 +24,7 @@ public static function get($array, array $indices)
     {
         foreach ($indices as $index) {
             // Use array_key_exists() for arrays, isset() otherwise
-            if (is_array($array)) {
+            if (\is_array($array)) {
                 if (array_key_exists($index, $array)) {
                     $array = $array[$index];
                     continue;
diff --git a/src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php b/src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php
index c66699a95e2a..a58d94e21102 100644
--- a/src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php
+++ b/src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php
@@ -107,7 +107,7 @@ public function format(\DateTime $dateTime)
      */
     public function formatReplace($dateChars, $dateTime)
     {
-        $length = strlen($dateChars);
+        $length = \strlen($dateChars);
 
         if ($this->isQuoteMatch($dateChars)) {
             return $this->replaceQuoteMatch($dateChars);
@@ -147,7 +147,7 @@ public function parse(\DateTime $dateTime, $value)
 
             foreach ($this->transformers as $char => $transformer) {
                 if (isset($matches[$char])) {
-                    $length = strlen($matches[$char]['pattern']);
+                    $length = \strlen($matches[$char]['pattern']);
                     $options = array_merge($options, $transformer->extractDateOptions($matches[$char]['value'], $length));
                 }
             }
@@ -181,7 +181,7 @@ public function getReverseMatchingRegExp($pattern)
         $escapedPattern = preg_replace('/\\\[\-|\/]/', '[\/\-]', $escapedPattern);
 
         $reverseMatchingRegExp = preg_replace_callback($this->regExp, function ($matches) {
-            $length = strlen($matches[0]);
+            $length = \strlen($matches[0]);
             $transformerIndex = $matches[0][0];
 
             $dateChars = $matches[0];
@@ -258,7 +258,7 @@ protected function normalizeArray(array $data)
         $ret = array();
 
         foreach ($data as $key => $value) {
-            if (!is_string($key)) {
+            if (!\is_string($key)) {
                 continue;
             }
 
@@ -313,7 +313,7 @@ protected function calculateUnixTimestamp(\DateTime $dateTime, array $options)
 
         // Normalize yy year
         preg_match_all($this->regExp, $this->pattern, $matches);
-        if (in_array('yy', $matches[0])) {
+        if (\in_array('yy', $matches[0])) {
             $dateTime->setTimestamp(time());
             $year = $year > $dateTime->format('y') + 20 ? 1900 + $year : 2000 + $year;
         }
diff --git a/src/Symfony/Component/Intl/DateFormatter/DateFormat/MonthTransformer.php b/src/Symfony/Component/Intl/DateFormatter/DateFormat/MonthTransformer.php
index ed669398f0ca..b3c286269069 100644
--- a/src/Symfony/Component/Intl/DateFormatter/DateFormat/MonthTransformer.php
+++ b/src/Symfony/Component/Intl/DateFormatter/DateFormat/MonthTransformer.php
@@ -52,7 +52,7 @@ class MonthTransformer extends Transformer
 
     public function __construct()
     {
-        if (0 === count(self::$shortMonths)) {
+        if (0 === \count(self::$shortMonths)) {
             self::$shortMonths = array_map(function ($month) {
                 return substr($month, 0, 3);
             }, self::$months);
diff --git a/src/Symfony/Component/Intl/DateFormatter/DateFormat/TimezoneTransformer.php b/src/Symfony/Component/Intl/DateFormatter/DateFormat/TimezoneTransformer.php
index 77a6e860256b..23734ed8fd9d 100644
--- a/src/Symfony/Component/Intl/DateFormatter/DateFormat/TimezoneTransformer.php
+++ b/src/Symfony/Component/Intl/DateFormatter/DateFormat/TimezoneTransformer.php
@@ -31,7 +31,7 @@ public function format(\DateTime $dateTime, int $length): string
     {
         $timeZone = substr($dateTime->getTimezone()->getName(), 0, 3);
 
-        if (!in_array($timeZone, array('Etc', 'UTC', 'GMT'))) {
+        if (!\in_array($timeZone, array('Etc', 'UTC', 'GMT'))) {
             throw new NotImplementedException('Time zone different than GMT or UTC is not supported as a formatting output.');
         }
 
@@ -41,7 +41,7 @@ public function format(\DateTime $dateTime, int $length): string
         }
 
         // From ICU >= 59.1 GMT and UTC are no longer unified
-        if (in_array($timeZone, array('UTC', 'UCT', 'Universal', 'Zulu'))) {
+        if (\in_array($timeZone, array('UTC', 'UCT', 'Universal', 'Zulu'))) {
             // offset is not supported with UTC
             return $length > 3 ? 'Coordinated Universal Time' : 'UTC';
         }
diff --git a/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php b/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
index 90db70829482..d303d6b33a1f 100644
--- a/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
+++ b/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Intl\DateFormatter;
 
-use Symfony\Component\Intl\Globals\IntlGlobals;
 use Symfony\Component\Intl\DateFormatter\DateFormat\FullTransformer;
-use Symfony\Component\Intl\Exception\MethodNotImplementedException;
 use Symfony\Component\Intl\Exception\MethodArgumentNotImplementedException;
 use Symfony\Component\Intl\Exception\MethodArgumentValueNotImplementedException;
+use Symfony\Component\Intl\Exception\MethodNotImplementedException;
+use Symfony\Component\Intl\Globals\IntlGlobals;
 use Symfony\Component\Intl\Locale\Locale;
 
 /**
@@ -187,7 +187,7 @@ public static function create($locale, $datetype, $timetype, $timezone = null, $
     public function format($timestamp)
     {
         // intl allows timestamps to be passed as arrays - we don't
-        if (is_array($timestamp)) {
+        if (\is_array($timestamp)) {
             $message = 'Only integer Unix timestamps and DateTime objects are supported';
 
             throw new MethodArgumentValueNotImplementedException(__METHOD__, 'timestamp', $timestamp, $message);
@@ -195,7 +195,7 @@ public function format($timestamp)
 
         // behave like the intl extension
         $argumentError = null;
-        if (!is_int($timestamp) && !$timestamp instanceof \DateTime) {
+        if (!\is_int($timestamp) && !$timestamp instanceof \DateTime) {
             $argumentError = sprintf('datefmt_format: string \'%s\' is not numeric, which would be required for it to be a valid date', $timestamp);
         }
 
diff --git a/src/Symfony/Component/Intl/Exception/UnexpectedTypeException.php b/src/Symfony/Component/Intl/Exception/UnexpectedTypeException.php
index 739152346cc2..9ec42753e08c 100644
--- a/src/Symfony/Component/Intl/Exception/UnexpectedTypeException.php
+++ b/src/Symfony/Component/Intl/Exception/UnexpectedTypeException.php
@@ -20,6 +20,6 @@ class UnexpectedTypeException extends InvalidArgumentException
 {
     public function __construct($value, string $expectedType)
     {
-        parent::__construct(sprintf('Expected argument of type "%s", "%s" given', $expectedType, is_object($value) ? get_class($value) : gettype($value)));
+        parent::__construct(sprintf('Expected argument of type "%s", "%s" given', $expectedType, \is_object($value) ? \get_class($value) : \gettype($value)));
     }
 }
diff --git a/src/Symfony/Component/Intl/Intl.php b/src/Symfony/Component/Intl/Intl.php
index b621d7e51d32..7777b0bb5715 100644
--- a/src/Symfony/Component/Intl/Intl.php
+++ b/src/Symfony/Component/Intl/Intl.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Intl;
 
-use Symfony\Component\Intl\Data\Bundle\Reader\JsonBundleReader;
 use Symfony\Component\Intl\Data\Bundle\Reader\BufferedBundleReader;
 use Symfony\Component\Intl\Data\Bundle\Reader\BundleEntryReader;
 use Symfony\Component\Intl\Data\Bundle\Reader\BundleEntryReaderInterface;
+use Symfony\Component\Intl\Data\Bundle\Reader\JsonBundleReader;
 use Symfony\Component\Intl\Data\Provider\LocaleDataProvider;
 use Symfony\Component\Intl\Data\Provider\ScriptDataProvider;
 use Symfony\Component\Intl\ResourceBundle\CurrencyBundle;
@@ -194,7 +194,7 @@ public static function getIcuVersion()
         if (false === self::$icuVersion) {
             if (!self::isExtensionLoaded()) {
                 self::$icuVersion = self::getIcuStubVersion();
-            } elseif (defined('INTL_ICU_VERSION')) {
+            } elseif (\defined('INTL_ICU_VERSION')) {
                 self::$icuVersion = INTL_ICU_VERSION;
             } else {
                 try {
diff --git a/src/Symfony/Component/Intl/Locale.php b/src/Symfony/Component/Intl/Locale.php
index 9b74fa4da3fa..931400d4a41f 100644
--- a/src/Symfony/Component/Intl/Locale.php
+++ b/src/Symfony/Component/Intl/Locale.php
@@ -67,16 +67,16 @@ public static function getDefaultFallback(): ?string
      */
     public static function getFallback($locale): ?string
     {
-        if (function_exists('locale_parse')) {
+        if (\function_exists('locale_parse')) {
             $localeSubTags = locale_parse($locale);
-            if (1 === count($localeSubTags)) {
+            if (1 === \count($localeSubTags)) {
                 if (self::$defaultFallback === $localeSubTags['language']) {
                     return 'root';
                 }
 
                 // Don't return default fallback for "root", "meta" or others
                 // Normal locales have two or three letters
-                if (strlen($locale) < 4) {
+                if (\strlen($locale) < 4) {
                     return self::$defaultFallback;
                 }
 
@@ -102,7 +102,7 @@ public static function getFallback($locale): ?string
 
         // Don't return default fallback for "root", "meta" or others
         // Normal locales have two or three letters
-        if (strlen($locale) < 4) {
+        if (\strlen($locale) < 4) {
             return self::$defaultFallback;
         }
 
diff --git a/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php b/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
index 6503e09bfce4..6be7b71503ea 100644
--- a/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
+++ b/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Intl\NumberFormatter;
 
-use Symfony\Component\Intl\Exception\NotImplementedException;
-use Symfony\Component\Intl\Exception\MethodNotImplementedException;
 use Symfony\Component\Intl\Exception\MethodArgumentNotImplementedException;
 use Symfony\Component\Intl\Exception\MethodArgumentValueNotImplementedException;
+use Symfony\Component\Intl\Exception\MethodNotImplementedException;
+use Symfony\Component\Intl\Exception\NotImplementedException;
 use Symfony\Component\Intl\Globals\IntlGlobals;
 use Symfony\Component\Intl\Intl;
 use Symfony\Component\Intl\Locale\Locale;
@@ -263,7 +263,7 @@ public function __construct(?string $locale = 'en', int $style = null, $pattern
             throw new MethodArgumentValueNotImplementedException(__METHOD__, 'locale', $locale, 'Only the locale "en" is supported');
         }
 
-        if (!in_array($style, self::$supportedStyles)) {
+        if (!\in_array($style, self::$supportedStyles)) {
             $message = sprintf('The available styles are: %s.', implode(', ', array_keys(self::$supportedStyles)));
             throw new MethodArgumentValueNotImplementedException(__METHOD__, 'style', $style, $message);
         }
@@ -521,9 +521,9 @@ public function parse($value, $type = self::TYPE_DOUBLE, &$position = 0)
         // Any string before the numeric value causes error in the parsing
         if (preg_match("/^-?(?:\.\d++|([\d{$groupSep}]++)(?:\.\d++)?)/", $value, $matches)) {
             $value = $matches[0];
-            $position = strlen($value);
+            $position = \strlen($value);
             if ($error = $groupSep && isset($matches[1]) && !preg_match('/^\d{1,3}+(?:(?:,\d{3})++|\d*+)$/', $matches[1])) {
-                $position -= strlen(preg_replace('/^\d{1,3}+(?:(?:,\d++)++|\d*+)/', '', $matches[1]));
+                $position -= \strlen(preg_replace('/^\d{1,3}+(?:(?:,\d++)++|\d*+)/', '', $matches[1]));
             }
         } else {
             $error = 1;
@@ -564,7 +564,7 @@ public function parse($value, $type = self::TYPE_DOUBLE, &$position = 0)
      */
     public function setAttribute($attr, $value)
     {
-        if (!in_array($attr, self::$supportedAttributes)) {
+        if (!\in_array($attr, self::$supportedAttributes)) {
             $message = sprintf(
                 'The available attributes are: %s',
                 implode(', ', array_keys(self::$supportedAttributes))
@@ -765,7 +765,7 @@ private function getUninitializedPrecision($value, $precision)
         if (!$this->isInitializedAttribute(self::FRACTION_DIGITS)) {
             preg_match('/.*\.(.*)/', (string) $value, $digits);
             if (isset($digits[1])) {
-                $precision = strlen($digits[1]);
+                $precision = \strlen($digits[1]);
             }
         }
 
@@ -850,7 +850,7 @@ private function getInt64Value($value)
      */
     private function isInvalidRoundingMode($value)
     {
-        if (in_array($value, self::$roundingModes, true)) {
+        if (\in_array($value, self::$roundingModes, true)) {
             return false;
         }
 
diff --git a/src/Symfony/Component/Intl/Resources/bin/icu.ini b/src/Symfony/Component/Intl/Resources/bin/icu.ini
deleted file mode 100644
index 9845e0bb1a33..000000000000
--- a/src/Symfony/Component/Intl/Resources/bin/icu.ini
+++ /dev/null
@@ -1,20 +0,0 @@
-; ICU data source URLs
-; We use always the latest release of a major version.
-4.0 = http://source.icu-project.org/repos/icu/icu/tags/release-4-0-1/source
-4.2 = http://source.icu-project.org/repos/icu/icu/tags/release-4-2-1/source
-4.4 = http://source.icu-project.org/repos/icu/icu/tags/release-4-4-2/source
-4.6 = http://source.icu-project.org/repos/icu/icu/tags/release-4-6-1/source
-4.8 = http://source.icu-project.org/repos/icu/icu/tags/release-4-8-1-1/source
-49 = http://source.icu-project.org/repos/icu/icu/tags/release-49-1-2/source
-50 = http://source.icu-project.org/repos/icu/icu/tags/release-50-1-2/source
-51 = http://source.icu-project.org/repos/icu/icu/tags/release-51-2/source
-52 = http://source.icu-project.org/repos/icu/icu/tags/release-52-1/source
-53 = http://source.icu-project.org/repos/icu/icu/tags/release-53-1/source
-54 = http://source.icu-project.org/repos/icu/icu/tags/release-54-1/source
-55 = http://source.icu-project.org/repos/icu/icu/tags/release-55-1/source
-57 = http://source.icu-project.org/repos/icu/icu/tags/release-57-1/source
-58 = http://source.icu-project.org/repos/icu/tags/release-58-2/icu4c/source
-59 = http://source.icu-project.org/repos/icu/tags/release-59-1/icu4c/source
-60 = http://source.icu-project.org/repos/icu/tags/release-60-2/icu4c/source
-61 = http://source.icu-project.org/repos/icu/tags/release-61-1/icu4c/source
-62 = http://source.icu-project.org/repos/icu/tags/release-62-1/icu4c/source
diff --git a/src/Symfony/Component/Intl/Resources/bin/update-data.php b/src/Symfony/Component/Intl/Resources/bin/update-data.php
index 0914d26ec608..7238f4688016 100644
--- a/src/Symfony/Component/Intl/Resources/bin/update-data.php
+++ b/src/Symfony/Component/Intl/Resources/bin/update-data.php
@@ -9,6 +9,9 @@
  * file that was distributed with this source code.
  */
 
+use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
+use Symfony\Component\Intl\Data\Bundle\Reader\BundleEntryReader;
 use Symfony\Component\Intl\Data\Bundle\Reader\JsonBundleReader;
 use Symfony\Component\Intl\Data\Bundle\Writer\JsonBundleWriter;
 use Symfony\Component\Intl\Data\Generator\CurrencyDataGenerator;
@@ -21,12 +24,8 @@
 use Symfony\Component\Intl\Data\Provider\RegionDataProvider;
 use Symfony\Component\Intl\Data\Provider\ScriptDataProvider;
 use Symfony\Component\Intl\Intl;
-use Symfony\Component\Intl\Data\Bundle\Compiler\GenrbCompiler;
-use Symfony\Component\Intl\Data\Bundle\Reader\BundleEntryReader;
 use Symfony\Component\Intl\Locale;
-use Symfony\Component\Intl\Util\IcuVersion;
-use Symfony\Component\Intl\Util\SvnRepository;
-use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\Intl\Util\GitRepository;
 
 require_once __DIR__.'/common.php';
 require_once __DIR__.'/autoload.php';
@@ -40,7 +39,7 @@
 
 Updates the ICU data for Symfony to the latest version of ICU.
 
-If you downloaded the SVN repository before, you can pass the path to the
+If you downloaded the git repository before, you can pass the path to the
 repository source in the first optional argument.
 
 If you also built the repository before, you can pass the directory where that
@@ -64,36 +63,30 @@
     bailout('The intl extension for PHP is not installed.');
 }
 
-$filesystem = new Filesystem();
-$urls = parse_ini_file(__DIR__.'/icu.ini');
-
-echo "icu.ini parsed. Available versions:\n";
+if ($argc >= 2) {
+    $repoDir = $argv[1];
+    $git = new GitRepository($repoDir);
 
-$maxVersion = 0;
+    echo "Using the existing git repository at {$repoDir}.\n";
+} else {
+    echo "Starting git clone. This may take a while...\n";
 
-foreach ($urls as $urlVersion => $url) {
-    $maxVersion = IcuVersion::compare($maxVersion, $urlVersion, '<')
-        ? $urlVersion
-        : $maxVersion;
+    $repoDir = sys_get_temp_dir().'/icu-data';
+    $git = GitRepository::download('https://github.com/unicode-org/icu.git', $repoDir);
 
-    echo "  $urlVersion\n";
+    echo "Git clone to {$repoDir} complete.\n";
 }
 
-$shortIcuVersion = strip_minor_versions($maxVersion);
-
-if ($argc >= 2) {
-    $sourceDir = $argv[1];
-    $svn = new SvnRepository($sourceDir);
-
-    echo "Using existing SVN repository at {$sourceDir}.\n";
-} else {
-    echo "Starting SVN checkout for version $shortIcuVersion. This may take a while...\n";
+$gitTag = $git->getLastTag(function ($tag) {
+    return preg_match('#^release-[0-9]{1,}-[0-9]{1}$#', $tag);
+});
+$shortIcuVersion = strip_minor_versions(preg_replace('#release-([0-9]{1,})-([0-9]{1,})#', '$1.$2', $gitTag));
 
-    $sourceDir = sys_get_temp_dir().'/icu-data/'.$shortIcuVersion.'/source';
-    $svn = SvnRepository::download($urls[$shortIcuVersion], $sourceDir);
+echo "Checking out `{$gitTag}` for version `{$shortIcuVersion}`...\n";
+$git->checkout('tags/'.$gitTag);
 
-    echo "SVN checkout to {$sourceDir} complete.\n";
-}
+$filesystem = new Filesystem();
+$sourceDir = $repoDir.'/icu4c/source';
 
 if ($argc >= 3) {
     $buildDir = $argv[2];
@@ -265,23 +258,23 @@
 
 echo "Resource bundle compilation complete.\n";
 
-$svnInfo = <<<SVN_INFO
-SVN information
+$gitInfo = <<<GIT_INFO
+Git information
 ===============
 
-URL: {$svn->getUrl()}
-Revision: {$svn->getLastCommit()->getRevision()}
-Author: {$svn->getLastCommit()->getAuthor()}
-Date: {$svn->getLastCommit()->getDate()}
+URL: {$git->getUrl()}
+Revision: {$git->getLastCommitHash()}
+Author: {$git->getLastAuthor()}
+Date: {$git->getLastAuthoredDate()->format('c')}
 
-SVN_INFO;
+GIT_INFO;
 
 foreach ($targetDirs as $targetDir) {
-    $svnInfoFile = $targetDir.'/svn-info.txt';
+    $gitInfoFile = $targetDir.'/git-info.txt';
 
-    file_put_contents($svnInfoFile, $svnInfo);
+    file_put_contents($gitInfoFile, $gitInfo);
 
-    echo "Wrote $svnInfoFile.\n";
+    echo "Wrote $gitInfoFile.\n";
 
     $versionFile = $targetDir.'/version.txt';
 
diff --git a/src/Symfony/Component/Intl/Resources/data/git-info.txt b/src/Symfony/Component/Intl/Resources/data/git-info.txt
new file mode 100644
index 000000000000..fe7ce332327e
--- /dev/null
+++ b/src/Symfony/Component/Intl/Resources/data/git-info.txt
@@ -0,0 +1,7 @@
+Git information
+===============
+
+URL: https://github.com/unicode-org/icu.git
+Revision: 4a3ba8eee90ea1414d4f7ee36563e6c9b28fda96
+Author: Yoshito Umaoka
+Date: 2018-06-20T05:34:56+00:00
diff --git a/src/Symfony/Component/Intl/Resources/data/svn-info.txt b/src/Symfony/Component/Intl/Resources/data/svn-info.txt
deleted file mode 100644
index 556c6cf35882..000000000000
--- a/src/Symfony/Component/Intl/Resources/data/svn-info.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-SVN information
-===============
-
-URL: http://source.icu-project.org/repos/icu/tags/release-62-1/icu4c/source
-Revision: 41542
-Author: yoshito
-Date: 2018-06-20T05:34:56.496986Z
diff --git a/src/Symfony/Component/Intl/Tests/Data/Bundle/Reader/BundleEntryReaderTest.php b/src/Symfony/Component/Intl/Tests/Data/Bundle/Reader/BundleEntryReaderTest.php
index d76e2ab39af4..aedc18d384fc 100644
--- a/src/Symfony/Component/Intl/Tests/Data/Bundle/Reader/BundleEntryReaderTest.php
+++ b/src/Symfony/Component/Intl/Tests/Data/Bundle/Reader/BundleEntryReaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Intl\Tests\Data\Bundle\Reader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Intl\Exception\ResourceBundleNotFoundException;
 use Symfony\Component\Intl\Data\Bundle\Reader\BundleEntryReader;
+use Symfony\Component\Intl\Exception\ResourceBundleNotFoundException;
 
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -189,7 +189,7 @@ public function provideMergeableValues()
      */
     public function testMergeDataWithFallbackData($childData, $parentData, $result)
     {
-        if (null === $childData || is_array($childData)) {
+        if (null === $childData || \is_array($childData)) {
             $this->readerImpl->expects($this->at(0))
                 ->method('read')
                 ->with(self::RES_DIR, 'en')
@@ -227,7 +227,7 @@ public function testDontMergeDataIfFallbackDisabled($childData, $parentData, $re
      */
     public function testMergeExistingEntryWithExistingFallbackEntry($childData, $parentData, $result)
     {
-        if (null === $childData || is_array($childData)) {
+        if (null === $childData || \is_array($childData)) {
             $this->readerImpl->expects($this->at(0))
                 ->method('read')
                 ->with(self::RES_DIR, 'en')
@@ -270,7 +270,7 @@ public function testMergeNonExistingEntryWithExistingFallbackEntry($childData, $
      */
     public function testMergeExistingEntryWithNonExistingFallbackEntry($childData, $parentData, $result)
     {
-        if (null === $childData || is_array($childData)) {
+        if (null === $childData || \is_array($childData)) {
             $this->readerImpl->expects($this->at(0))
                 ->method('read')
                 ->with(self::RES_DIR, 'en_GB')
@@ -313,8 +313,8 @@ public function testFailIfEntryFoundNeitherInParentNorChild()
      */
     public function testMergeTraversables($childData, $parentData, $result)
     {
-        $parentData = is_array($parentData) ? new \ArrayObject($parentData) : $parentData;
-        $childData = is_array($childData) ? new \ArrayObject($childData) : $childData;
+        $parentData = \is_array($parentData) ? new \ArrayObject($parentData) : $parentData;
+        $childData = \is_array($childData) ? new \ArrayObject($childData) : $childData;
 
         if (null === $childData || $childData instanceof \ArrayObject) {
             $this->readerImpl->expects($this->at(0))
@@ -343,7 +343,7 @@ public function testFollowLocaleAliases($childData, $parentData, $result)
     {
         $this->reader->setLocaleAliases(array('mo' => 'ro_MD'));
 
-        if (null === $childData || is_array($childData)) {
+        if (null === $childData || \is_array($childData)) {
             $this->readerImpl->expects($this->at(0))
                 ->method('read')
                 ->with(self::RES_DIR, 'ro_MD')
diff --git a/src/Symfony/Component/Intl/Tests/DateFormatter/AbstractIntlDateFormatterTest.php b/src/Symfony/Component/Intl/Tests/DateFormatter/AbstractIntlDateFormatterTest.php
index 7a4f01b66ae5..37342ae6e9be 100644
--- a/src/Symfony/Component/Intl/Tests/DateFormatter/AbstractIntlDateFormatterTest.php
+++ b/src/Symfony/Component/Intl/Tests/DateFormatter/AbstractIntlDateFormatterTest.php
@@ -432,7 +432,7 @@ public function testFormatWithDateTimeZoneGmtOffset()
 
     public function testFormatWithIntlTimeZone()
     {
-        if (!extension_loaded('intl')) {
+        if (!\extension_loaded('intl')) {
             $this->markTestSkipped('Extension intl is required.');
         }
 
diff --git a/src/Symfony/Component/Intl/Tests/IntlTest.php b/src/Symfony/Component/Intl/Tests/IntlTest.php
index d77655b77d47..e628c850a970 100644
--- a/src/Symfony/Component/Intl/Tests/IntlTest.php
+++ b/src/Symfony/Component/Intl/Tests/IntlTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Intl\Tests;
 
-use Symfony\Component\Intl\Intl;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Intl\Intl;
 
 class IntlTest extends TestCase
 {
diff --git a/src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php b/src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php
index 5ee414a1c250..932f659744c1 100644
--- a/src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php
+++ b/src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php
@@ -159,8 +159,8 @@ public function testSetDefaultAcceptsEn()
 
     protected function call($methodName)
     {
-        $args = array_slice(func_get_args(), 1);
+        $args = \array_slice(\func_get_args(), 1);
 
-        return call_user_func_array(array('Symfony\Component\Intl\Locale\Locale', $methodName), $args);
+        return \call_user_func_array(array('Symfony\Component\Intl\Locale\Locale', $methodName), $args);
     }
 }
diff --git a/src/Symfony/Component/Intl/Tests/Locale/Verification/LocaleTest.php b/src/Symfony/Component/Intl/Tests/Locale/Verification/LocaleTest.php
index adfec280a799..cdcc0fdeb664 100644
--- a/src/Symfony/Component/Intl/Tests/Locale/Verification/LocaleTest.php
+++ b/src/Symfony/Component/Intl/Tests/Locale/Verification/LocaleTest.php
@@ -31,8 +31,8 @@ protected function setUp()
 
     protected function call($methodName)
     {
-        $args = array_slice(func_get_args(), 1);
+        $args = \array_slice(\func_get_args(), 1);
 
-        return call_user_func_array(array('Locale', $methodName), $args);
+        return \call_user_func_array(array('Locale', $methodName), $args);
     }
 }
diff --git a/src/Symfony/Component/Intl/Tests/LocaleTest.php b/src/Symfony/Component/Intl/Tests/LocaleTest.php
index e10df5575ab6..57059af9ae94 100644
--- a/src/Symfony/Component/Intl/Tests/LocaleTest.php
+++ b/src/Symfony/Component/Intl/Tests/LocaleTest.php
@@ -28,7 +28,7 @@ public function provideGetFallbackTests()
             array(null, 'root'),
         );
 
-        if (function_exists('locale_parse')) {
+        if (\function_exists('locale_parse')) {
             $tests[] = array('sl_Latn_IT', 'sl-Latn-IT-nedis');
             $tests[] = array('sl_Latn', 'sl-Latn_IT');
         } else {
diff --git a/src/Symfony/Component/Intl/Tests/Util/GitRepositoryTest.php b/src/Symfony/Component/Intl/Tests/Util/GitRepositoryTest.php
new file mode 100644
index 000000000000..a9eb5319074f
--- /dev/null
+++ b/src/Symfony/Component/Intl/Tests/Util/GitRepositoryTest.php
@@ -0,0 +1,73 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Intl\Tests\Util;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\Intl\Util\GitRepository;
+
+/**
+ * @group intl-data
+ */
+class GitRepositoryTest extends TestCase
+{
+    private $targetDir;
+
+    const REPO_URL = 'https://github.com/symfony/intl.git';
+
+    /**
+     * @before
+     * @after
+     */
+    protected function cleanup()
+    {
+        $this->targetDir = sys_get_temp_dir().'/GitRepositoryTest/source';
+
+        $fs = new Filesystem();
+        $fs->remove($this->targetDir);
+    }
+
+    public function testItThrowsAnExceptionIfInitialisedWithNonGitDirectory()
+    {
+        $this->expectException('Symfony\Component\Intl\Exception\RuntimeException');
+
+        @mkdir($this->targetDir, '0777', true);
+
+        new GitRepository($this->targetDir);
+    }
+
+    public function testItClonesTheRepository()
+    {
+        $git = GitRepository::download(self::REPO_URL, $this->targetDir);
+
+        $this->assertInstanceOf('Symfony\Component\Intl\Util\GitRepository', $git);
+        $this->assertDirectoryExists($this->targetDir.'/.git');
+        $this->assertSame($this->targetDir, $git->getPath());
+        $this->assertSame(self::REPO_URL, $git->getUrl());
+        $this->assertRegExp('#^[0-9a-z]{40}$#', $git->getLastCommitHash());
+        $this->assertNotEmpty($git->getLastAuthor());
+        $this->assertInstanceOf('DateTime', $git->getLastAuthoredDate());
+        $this->assertStringMatchesFormat('v%s', $git->getLastTag());
+        $this->assertStringMatchesFormat('v3%s', $git->getLastTag(function ($tag) { return 0 === strpos($tag, 'v3'); }));
+    }
+
+    public function testItCheckoutsToTheLastTag()
+    {
+        $git = GitRepository::download(self::REPO_URL, $this->targetDir);
+        $lastCommitHash = $git->getLastCommitHash();
+        $lastV3Tag = $git->getLastTag(function ($tag) { return 0 === strpos($tag, 'v3'); });
+
+        $git->checkout($lastV3Tag);
+
+        $this->assertNotEquals($lastCommitHash, $git->getLastCommitHash());
+    }
+}
diff --git a/src/Symfony/Component/Intl/Util/GitRepository.php b/src/Symfony/Component/Intl/Util/GitRepository.php
new file mode 100644
index 000000000000..4f1eaaec065f
--- /dev/null
+++ b/src/Symfony/Component/Intl/Util/GitRepository.php
@@ -0,0 +1,108 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Intl\Util;
+
+use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\Intl\Exception\RuntimeException;
+
+/**
+ * @internal
+ */
+final class GitRepository
+{
+    private $path;
+
+    public function __construct(string $path)
+    {
+        $this->path = $path;
+
+        $this->getUrl();
+    }
+
+    public static function download(string $remote, string $targetDir): self
+    {
+        self::exec('which git', 'The command "git" is not installed.');
+
+        $filesystem = new Filesystem();
+
+        if (!$filesystem->exists($targetDir.'/.git')) {
+            $filesystem->remove($targetDir);
+            $filesystem->mkdir($targetDir);
+
+            self::exec(sprintf('git clone %s %s', escapeshellarg($remote), escapeshellarg($targetDir)));
+        }
+
+        return new self(realpath($targetDir));
+    }
+
+    public function getPath()
+    {
+        return $this->path;
+    }
+
+    public function getUrl()
+    {
+        return $this->getLastLine($this->execInPath('git config --get remote.origin.url'));
+    }
+
+    public function getLastCommitHash()
+    {
+        return $this->getLastLine($this->execInPath('git log -1 --format="%H"'));
+    }
+
+    public function getLastAuthor()
+    {
+        return $this->getLastLine($this->execInPath('git log -1 --format="%an"'));
+    }
+
+    public function getLastAuthoredDate()
+    {
+        return new \DateTime($this->getLastLine($this->execInPath('git log -1 --format="%ai"')));
+    }
+
+    public function getLastTag(callable $filter = null)
+    {
+        $tags = $this->execInPath('git tag -l --sort=v:refname');
+
+        if (null !== $filter) {
+            $tags = array_filter($tags, $filter);
+        }
+
+        return $this->getLastLine($tags);
+    }
+
+    public function checkout($branch)
+    {
+        $this->execInPath(sprintf('git checkout %s', escapeshellarg($branch)));
+    }
+
+    private function execInPath($command)
+    {
+        return self::exec(sprintf('cd %s && %s', escapeshellarg($this->path), $command));
+    }
+
+    private static function exec($command, $customErrorMessage = null)
+    {
+        exec(sprintf('%s 2>&1', $command), $output, $result);
+
+        if (0 !== $result) {
+            throw new RuntimeException(null !== $customErrorMessage ? $customErrorMessage : sprintf('The `%s` command failed.', $command));
+        }
+
+        return $output;
+    }
+
+    private function getLastLine(array $output)
+    {
+        return array_pop($output);
+    }
+}
diff --git a/src/Symfony/Component/Intl/Util/IcuVersion.php b/src/Symfony/Component/Intl/Util/IcuVersion.php
index 1f141224a59e..5242fae206ae 100644
--- a/src/Symfony/Component/Intl/Util/IcuVersion.php
+++ b/src/Symfony/Component/Intl/Util/IcuVersion.php
@@ -91,7 +91,7 @@ public static function normalize($version, $precision)
     {
         $version = preg_replace('/^(\d)\.(\d)/', '$1$2', $version);
 
-        if (1 === strlen($version)) {
+        if (1 === \strlen($version)) {
             $version .= '0';
         }
 
diff --git a/src/Symfony/Component/Intl/Util/SvnCommit.php b/src/Symfony/Component/Intl/Util/SvnCommit.php
deleted file mode 100644
index f83958fe38c8..000000000000
--- a/src/Symfony/Component/Intl/Util/SvnCommit.php
+++ /dev/null
@@ -1,62 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Intl\Util;
-
-/**
- * An SVN commit.
- *
- * @author Bernhard Schussek <bschussek@gmail.com>
- */
-class SvnCommit
-{
-    private $svnInfo;
-
-    /**
-     * Creates a commit from the given "svn info" data.
-     *
-     * @param \SimpleXMLElement $svnInfo the XML result from the "svn info" command
-     */
-    public function __construct(\SimpleXMLElement $svnInfo)
-    {
-        $this->svnInfo = $svnInfo;
-    }
-
-    /**
-     * Returns the revision of the commit.
-     *
-     * @return string The revision of the commit
-     */
-    public function getRevision()
-    {
-        return (string) $this->svnInfo['revision'];
-    }
-
-    /**
-     * Returns the author of the commit.
-     *
-     * @return string The author name
-     */
-    public function getAuthor()
-    {
-        return (string) $this->svnInfo->author;
-    }
-
-    /**
-     * Returns the date of the commit.
-     *
-     * @return string The commit date
-     */
-    public function getDate()
-    {
-        return (string) $this->svnInfo->date;
-    }
-}
diff --git a/src/Symfony/Component/Intl/Util/SvnRepository.php b/src/Symfony/Component/Intl/Util/SvnRepository.php
deleted file mode 100644
index 00049791d9f8..000000000000
--- a/src/Symfony/Component/Intl/Util/SvnRepository.php
+++ /dev/null
@@ -1,140 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Intl\Util;
-
-use Symfony\Component\Filesystem\Filesystem;
-use Symfony\Component\Intl\Exception\RuntimeException;
-
-/**
- * A SVN repository containing ICU data.
- *
- * @author Bernhard Schussek <bschussek@gmail.com>
- */
-class SvnRepository
-{
-    /**
-     * @var string The path to the repository
-     */
-    private $path;
-
-    /**
-     * @var \SimpleXMLElement
-     */
-    private $svnInfo;
-
-    /**
-     * @var SvnCommit
-     */
-    private $lastCommit;
-
-    /**
-     * Downloads the ICU data for the given version.
-     *
-     * @param string $url       The URL to download from
-     * @param string $targetDir The directory in which to store the repository
-     *
-     * @return static
-     *
-     * @throws RuntimeException if an error occurs during the download
-     */
-    public static function download($url, $targetDir)
-    {
-        exec('which svn', $output, $result);
-
-        if (0 !== $result) {
-            throw new RuntimeException('The command "svn" is not installed.');
-        }
-
-        $filesystem = new Filesystem();
-
-        if (!$filesystem->exists($targetDir.'/.svn')) {
-            $filesystem->remove($targetDir);
-            $filesystem->mkdir($targetDir);
-
-            exec('svn checkout '.$url.' '.$targetDir, $output, $result);
-
-            if (0 !== $result) {
-                throw new RuntimeException('The SVN checkout of '.$url.'failed.');
-            }
-        }
-
-        return new static(realpath($targetDir));
-    }
-
-    /**
-     * Reads the SVN repository at the given path.
-     *
-     * @param string $path The path to the repository
-     */
-    public function __construct(string $path)
-    {
-        $this->path = $path;
-    }
-
-    /**
-     * Returns the path to the repository.
-     *
-     * @return string The path to the repository
-     */
-    public function getPath()
-    {
-        return $this->path;
-    }
-
-    /**
-     * Returns the URL of the repository.
-     *
-     * @return string The URL of the repository
-     */
-    public function getUrl()
-    {
-        return (string) $this->getSvnInfo()->entry->url;
-    }
-
-    /**
-     * Returns the last commit of the repository.
-     *
-     * @return SvnCommit The last commit
-     */
-    public function getLastCommit()
-    {
-        if (null === $this->lastCommit) {
-            $this->lastCommit = new SvnCommit($this->getSvnInfo()->entry->commit);
-        }
-
-        return $this->lastCommit;
-    }
-
-    /**
-     * Returns information about the SVN repository.
-     *
-     * @return \SimpleXMLElement The XML result from the "svn info" command
-     *
-     * @throws RuntimeException if the "svn info" command failed
-     */
-    private function getSvnInfo()
-    {
-        if (null === $this->svnInfo) {
-            exec('svn info --xml '.$this->path, $output, $result);
-
-            $svnInfo = simplexml_load_string(implode("\n", $output));
-
-            if (0 !== $result) {
-                throw new RuntimeException('svn info failed');
-            }
-
-            $this->svnInfo = $svnInfo;
-        }
-
-        return $this->svnInfo;
-    }
-}
diff --git a/src/Symfony/Component/Ldap/Adapter/AbstractQuery.php b/src/Symfony/Component/Ldap/Adapter/AbstractQuery.php
index 660e52dcb75f..4bba5c2ebee4 100644
--- a/src/Symfony/Component/Ldap/Adapter/AbstractQuery.php
+++ b/src/Symfony/Component/Ldap/Adapter/AbstractQuery.php
@@ -40,7 +40,7 @@ public function __construct(ConnectionInterface $connection, string $dn, string
         $resolver->setAllowedValues('scope', array(static::SCOPE_BASE, static::SCOPE_ONE, static::SCOPE_SUB));
 
         $resolver->setNormalizer('filter', function (Options $options, $value) {
-            return is_array($value) ? $value : array($value);
+            return \is_array($value) ? $value : array($value);
         });
 
         $this->connection = $connection;
diff --git a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Adapter.php b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Adapter.php
index 05fbce0b207b..fbc41af36bfe 100644
--- a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Adapter.php
+++ b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Adapter.php
@@ -25,7 +25,7 @@ class Adapter implements AdapterInterface
 
     public function __construct(array $config = array())
     {
-        if (!extension_loaded('ldap')) {
+        if (!\extension_loaded('ldap')) {
             throw new LdapException('The LDAP PHP extension is not enabled.');
         }
 
@@ -76,7 +76,7 @@ public function escape($subject, $ignore = '', $flags = 0)
             if (!empty($value) && ' ' === $value[0]) {
                 $value = '\\20'.substr($value, 1);
             }
-            if (!empty($value) && ' ' === $value[strlen($value) - 1]) {
+            if (!empty($value) && ' ' === $value[\strlen($value) - 1]) {
                 $value = substr($value, 0, -1).'\\20';
             }
             $value = str_replace("\r", '\0d', $value);
diff --git a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Connection.php b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Connection.php
index 5308d484990b..d2453f20d628 100644
--- a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Connection.php
+++ b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Connection.php
@@ -144,7 +144,7 @@ private function connect()
 
     private function disconnect()
     {
-        if ($this->connection && is_resource($this->connection)) {
+        if ($this->connection && \is_resource($this->connection)) {
             ldap_unbind($this->connection);
         }
 
diff --git a/src/Symfony/Component/Ldap/Adapter/ExtLdap/ConnectionOptions.php b/src/Symfony/Component/Ldap/Adapter/ExtLdap/ConnectionOptions.php
index 6d878aa69906..c03171eb66ff 100644
--- a/src/Symfony/Component/Ldap/Adapter/ExtLdap/ConnectionOptions.php
+++ b/src/Symfony/Component/Ldap/Adapter/ExtLdap/ConnectionOptions.php
@@ -64,15 +64,15 @@ public static function getOption($name)
         // Convert
         $constantName = self::getOptionName($name);
 
-        if (!defined($constantName)) {
+        if (!\defined($constantName)) {
             throw new LdapException(sprintf('Unknown option "%s".', $name));
         }
 
-        return constant($constantName);
+        return \constant($constantName);
     }
 
     public static function isOption($name)
     {
-        return defined(self::getOptionName($name));
+        return \defined(self::getOptionName($name));
     }
 }
diff --git a/src/Symfony/Component/Lock/Store/CombinedStore.php b/src/Symfony/Component/Lock/Store/CombinedStore.php
index 50258fe694d6..b3c76d013e33 100644
--- a/src/Symfony/Component/Lock/Store/CombinedStore.php
+++ b/src/Symfony/Component/Lock/Store/CombinedStore.php
@@ -19,8 +19,8 @@
 use Symfony\Component\Lock\Exception\LockExpiredException;
 use Symfony\Component\Lock\Exception\NotSupportedException;
 use Symfony\Component\Lock\Key;
-use Symfony\Component\Lock\Strategy\StrategyInterface;
 use Symfony\Component\Lock\StoreInterface;
+use Symfony\Component\Lock\Strategy\StrategyInterface;
 
 /**
  * CombinedStore is a StoreInterface implementation able to manage and synchronize several StoreInterfaces.
@@ -46,7 +46,7 @@ public function __construct(array $stores, StrategyInterface $strategy)
     {
         foreach ($stores as $store) {
             if (!$store instanceof StoreInterface) {
-                throw new InvalidArgumentException(sprintf('The store must implement "%s". Got "%s".', StoreInterface::class, get_class($store)));
+                throw new InvalidArgumentException(sprintf('The store must implement "%s". Got "%s".', StoreInterface::class, \get_class($store)));
             }
         }
 
@@ -62,7 +62,7 @@ public function save(Key $key)
     {
         $successCount = 0;
         $failureCount = 0;
-        $storesCount = count($this->stores);
+        $storesCount = \count($this->stores);
 
         foreach ($this->stores as $store) {
             try {
@@ -92,7 +92,7 @@ public function save(Key $key)
 
     public function waitAndSave(Key $key)
     {
-        throw new NotSupportedException(sprintf('The store "%s" does not supports blocking locks.', get_class($this)));
+        throw new NotSupportedException(sprintf('The store "%s" does not supports blocking locks.', \get_class($this)));
     }
 
     /**
@@ -102,7 +102,7 @@ public function putOffExpiration(Key $key, $ttl)
     {
         $successCount = 0;
         $failureCount = 0;
-        $storesCount = count($this->stores);
+        $storesCount = \count($this->stores);
         $expireAt = microtime(true) + $ttl;
 
         foreach ($this->stores as $store) {
@@ -164,7 +164,7 @@ public function exists(Key $key)
     {
         $successCount = 0;
         $failureCount = 0;
-        $storesCount = count($this->stores);
+        $storesCount = \count($this->stores);
 
         foreach ($this->stores as $store) {
             if ($store->exists($key)) {
diff --git a/src/Symfony/Component/Lock/Store/MemcachedStore.php b/src/Symfony/Component/Lock/Store/MemcachedStore.php
index f1c5c11208f3..fc504ca85647 100644
--- a/src/Symfony/Component/Lock/Store/MemcachedStore.php
+++ b/src/Symfony/Component/Lock/Store/MemcachedStore.php
@@ -31,7 +31,7 @@ class MemcachedStore implements StoreInterface
 
     public static function isSupported()
     {
-        return extension_loaded('memcached');
+        return \extension_loaded('memcached');
     }
 
     /**
@@ -71,7 +71,7 @@ public function save(Key $key)
 
     public function waitAndSave(Key $key)
     {
-        throw new InvalidArgumentException(sprintf('The store "%s" does not supports blocking locks.', get_class($this)));
+        throw new InvalidArgumentException(sprintf('The store "%s" does not supports blocking locks.', \get_class($this)));
     }
 
     /**
diff --git a/src/Symfony/Component/Lock/Store/RedisStore.php b/src/Symfony/Component/Lock/Store/RedisStore.php
index 291e0f5254ff..6d7958beefb9 100644
--- a/src/Symfony/Component/Lock/Store/RedisStore.php
+++ b/src/Symfony/Component/Lock/Store/RedisStore.php
@@ -35,7 +35,7 @@ class RedisStore implements StoreInterface
     public function __construct($redisClient, float $initialTtl = 300.0)
     {
         if (!$redisClient instanceof \Redis && !$redisClient instanceof \RedisArray && !$redisClient instanceof \RedisCluster && !$redisClient instanceof \Predis\Client && !$redisClient instanceof RedisProxy) {
-            throw new InvalidArgumentException(sprintf('%s() expects parameter 1 to be Redis, RedisArray, RedisCluster or Predis\Client, %s given', __METHOD__, is_object($redisClient) ? get_class($redisClient) : gettype($redisClient)));
+            throw new InvalidArgumentException(sprintf('%s() expects parameter 1 to be Redis, RedisArray, RedisCluster or Predis\Client, %s given', __METHOD__, \is_object($redisClient) ? \get_class($redisClient) : \gettype($redisClient)));
         }
 
         if ($initialTtl <= 0) {
@@ -71,7 +71,7 @@ public function save(Key $key)
 
     public function waitAndSave(Key $key)
     {
-        throw new InvalidArgumentException(sprintf('The store "%s" does not supports blocking locks.', get_class($this)));
+        throw new InvalidArgumentException(sprintf('The store "%s" does not supports blocking locks.', \get_class($this)));
     }
 
     /**
@@ -137,10 +137,10 @@ private function evaluate(string $script, string $resource, array $args)
         }
 
         if ($this->redis instanceof \Predis\Client) {
-            return call_user_func_array(array($this->redis, 'eval'), array_merge(array($script, 1, $resource), $args));
+            return \call_user_func_array(array($this->redis, 'eval'), array_merge(array($script, 1, $resource), $args));
         }
 
-        throw new InvalidArgumentException(sprintf('%s() expects been initialized with a Redis, RedisArray, RedisCluster or Predis\Client, %s given', __METHOD__, is_object($this->redis) ? get_class($this->redis) : gettype($this->redis)));
+        throw new InvalidArgumentException(sprintf('%s() expects been initialized with a Redis, RedisArray, RedisCluster or Predis\Client, %s given', __METHOD__, \is_object($this->redis) ? \get_class($this->redis) : \gettype($this->redis)));
     }
 
     /**
diff --git a/src/Symfony/Component/Lock/Store/SemaphoreStore.php b/src/Symfony/Component/Lock/Store/SemaphoreStore.php
index 6a32a303f4df..47f8616b0a84 100644
--- a/src/Symfony/Component/Lock/Store/SemaphoreStore.php
+++ b/src/Symfony/Component/Lock/Store/SemaphoreStore.php
@@ -32,7 +32,7 @@ class SemaphoreStore implements StoreInterface
      */
     public static function isSupported()
     {
-        return extension_loaded('sysvsem');
+        return \extension_loaded('sysvsem');
     }
 
     public function __construct()
diff --git a/src/Symfony/Component/Lock/Store/StoreFactory.php b/src/Symfony/Component/Lock/Store/StoreFactory.php
index a768d19746fe..cbbcb685c362 100644
--- a/src/Symfony/Component/Lock/Store/StoreFactory.php
+++ b/src/Symfony/Component/Lock/Store/StoreFactory.php
@@ -35,6 +35,6 @@ public static function createStore($connection)
             return new MemcachedStore($connection);
         }
 
-        throw new InvalidArgumentException(sprintf('Unsupported Connection: %s.', get_class($connection)));
+        throw new InvalidArgumentException(sprintf('Unsupported Connection: %s.', \get_class($connection)));
     }
 }
diff --git a/src/Symfony/Component/Lock/Tests/Store/CombinedStoreTest.php b/src/Symfony/Component/Lock/Tests/Store/CombinedStoreTest.php
index c7232d407fee..699a3072b341 100644
--- a/src/Symfony/Component/Lock/Tests/Store/CombinedStoreTest.php
+++ b/src/Symfony/Component/Lock/Tests/Store/CombinedStoreTest.php
@@ -13,11 +13,11 @@
 
 use Symfony\Component\Lock\Exception\LockConflictedException;
 use Symfony\Component\Lock\Key;
-use Symfony\Component\Lock\Strategy\UnanimousStrategy;
-use Symfony\Component\Lock\Strategy\StrategyInterface;
 use Symfony\Component\Lock\Store\CombinedStore;
 use Symfony\Component\Lock\Store\RedisStore;
 use Symfony\Component\Lock\StoreInterface;
+use Symfony\Component\Lock\Strategy\StrategyInterface;
+use Symfony\Component\Lock\Strategy\UnanimousStrategy;
 
 /**
  * @author Jérémy Derussé <jeremy@derusse.com>
diff --git a/src/Symfony/Component/OptionsResolver/Debug/OptionsResolverIntrospector.php b/src/Symfony/Component/OptionsResolver/Debug/OptionsResolverIntrospector.php
index 4d9699df4c9c..dca9cb496b24 100644
--- a/src/Symfony/Component/OptionsResolver/Debug/OptionsResolverIntrospector.php
+++ b/src/Symfony/Component/OptionsResolver/Debug/OptionsResolverIntrospector.php
@@ -47,7 +47,7 @@ public function __construct(OptionsResolver $optionsResolver)
      */
     public function getDefault(string $option)
     {
-        return call_user_func($this->get, 'defaults', $option, sprintf('No default value was set for the "%s" option.', $option));
+        return \call_user_func($this->get, 'defaults', $option, sprintf('No default value was set for the "%s" option.', $option));
     }
 
     /**
@@ -57,7 +57,7 @@ public function getDefault(string $option)
      */
     public function getLazyClosures(string $option): array
     {
-        return call_user_func($this->get, 'lazy', $option, sprintf('No lazy closures were set for the "%s" option.', $option));
+        return \call_user_func($this->get, 'lazy', $option, sprintf('No lazy closures were set for the "%s" option.', $option));
     }
 
     /**
@@ -67,7 +67,7 @@ public function getLazyClosures(string $option): array
      */
     public function getAllowedTypes(string $option): array
     {
-        return call_user_func($this->get, 'allowedTypes', $option, sprintf('No allowed types were set for the "%s" option.', $option));
+        return \call_user_func($this->get, 'allowedTypes', $option, sprintf('No allowed types were set for the "%s" option.', $option));
     }
 
     /**
@@ -77,7 +77,7 @@ public function getAllowedTypes(string $option): array
      */
     public function getAllowedValues(string $option): array
     {
-        return call_user_func($this->get, 'allowedValues', $option, sprintf('No allowed values were set for the "%s" option.', $option));
+        return \call_user_func($this->get, 'allowedValues', $option, sprintf('No allowed values were set for the "%s" option.', $option));
     }
 
     /**
@@ -85,6 +85,6 @@ public function getAllowedValues(string $option): array
      */
     public function getNormalizer(string $option): \Closure
     {
-        return call_user_func($this->get, 'normalizers', $option, sprintf('No normalizer was set for the "%s" option.', $option));
+        return \call_user_func($this->get, 'normalizers', $option, sprintf('No normalizer was set for the "%s" option.', $option));
     }
 }
diff --git a/src/Symfony/Component/OptionsResolver/OptionsResolver.php b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
index 5f291f7cbff2..73e35a96196a 100644
--- a/src/Symfony/Component/OptionsResolver/OptionsResolver.php
+++ b/src/Symfony/Component/OptionsResolver/OptionsResolver.php
@@ -478,7 +478,7 @@ public function addAllowedValues($option, $allowedValues)
             ));
         }
 
-        if (!is_array($allowedValues)) {
+        if (!\is_array($allowedValues)) {
             $allowedValues = array($allowedValues);
         }
 
@@ -660,12 +660,12 @@ public function resolve(array $options = array())
         // Make sure that no unknown options are passed
         $diff = array_diff_key($options, $clone->defined);
 
-        if (count($diff) > 0) {
+        if (\count($diff) > 0) {
             ksort($clone->defined);
             ksort($diff);
 
             throw new UndefinedOptionsException(sprintf(
-                (count($diff) > 1 ? 'The options "%s" do not exist.' : 'The option "%s" does not exist.').' Defined options are: "%s".',
+                (\count($diff) > 1 ? 'The options "%s" do not exist.' : 'The option "%s" does not exist.').' Defined options are: "%s".',
                 implode('", "', array_keys($diff)),
                 implode('", "', array_keys($clone->defined))
             ));
@@ -680,11 +680,11 @@ public function resolve(array $options = array())
         // Check whether any required option is missing
         $diff = array_diff_key($clone->required, $clone->defaults);
 
-        if (count($diff) > 0) {
+        if (\count($diff) > 0) {
             ksort($diff);
 
             throw new MissingOptionsException(sprintf(
-                count($diff) > 1 ? 'The required options "%s" are missing.' : 'The required option "%s" is missing.',
+                \count($diff) > 1 ? 'The required options "%s" are missing.' : 'The required option "%s" is missing.',
                 implode('", "', array_keys($diff))
             ));
         }
@@ -824,7 +824,7 @@ public function offsetGet($option)
                     $this->formatValue($value)
                 );
 
-                if (count($printableAllowedValues) > 0) {
+                if (\count($printableAllowedValues) > 0) {
                     $message .= sprintf(
                         ' Accepted values are: %s.',
                         $this->formatValues($printableAllowedValues)
@@ -978,7 +978,7 @@ public function count()
             throw new AccessException('Counting is only supported within closures of lazy options and normalizers.');
         }
 
-        return count($this->defaults);
+        return \count($this->defaults);
     }
 
     /**
@@ -1017,7 +1017,7 @@ private function formatTypeOf($value, ?string $type): string
             }
         }
 
-        return (\is_object($value) ? get_class($value) : gettype($value)).$suffix;
+        return (\is_object($value) ? \get_class($value) : \gettype($value)).$suffix;
     }
 
     /**
@@ -1032,7 +1032,7 @@ private function formatTypeOf($value, ?string $type): string
     private function formatValue($value): string
     {
         if (\is_object($value)) {
-            return get_class($value);
+            return \get_class($value);
         }
 
         if (\is_array($value)) {
@@ -1081,7 +1081,7 @@ private function formatValues(array $values): string
 
     private static function isValueValidType(string $type, $value): bool
     {
-        return (function_exists($isFunction = 'is_'.$type) && $isFunction($value)) || $value instanceof $type;
+        return (\function_exists($isFunction = 'is_'.$type) && $isFunction($value)) || $value instanceof $type;
     }
 
     private function getInvalidValues(array $arrayValues, string $type): array
diff --git a/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php b/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
index ac1298444760..449a53f6eb5e 100644
--- a/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
+++ b/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php
@@ -1584,7 +1584,7 @@ public function testCountFailsOutsideResolve()
         $this->resolver->setDefined('bar');
         $this->resolver->setDefault('lazy1', function () {});
 
-        count($this->resolver);
+        \count($this->resolver);
     }
 
     public function testNestedArrays()
diff --git a/src/Symfony/Component/Process/ExecutableFinder.php b/src/Symfony/Component/Process/ExecutableFinder.php
index defa66de6b35..ccfa4c09b09a 100644
--- a/src/Symfony/Component/Process/ExecutableFinder.php
+++ b/src/Symfony/Component/Process/ExecutableFinder.php
@@ -71,13 +71,13 @@ public function find($name, $default = null, array $extraDirs = array())
         }
 
         $suffixes = array('');
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $pathExt = getenv('PATHEXT');
             $suffixes = array_merge($pathExt ? explode(PATH_SEPARATOR, $pathExt) : $this->suffixes, $suffixes);
         }
         foreach ($suffixes as $suffix) {
             foreach ($dirs as $dir) {
-                if (@is_file($file = $dir.DIRECTORY_SEPARATOR.$name.$suffix) && ('\\' === DIRECTORY_SEPARATOR || @is_executable($file))) {
+                if (@is_file($file = $dir.\DIRECTORY_SEPARATOR.$name.$suffix) && ('\\' === \DIRECTORY_SEPARATOR || @is_executable($file))) {
                     return $file;
                 }
             }
diff --git a/src/Symfony/Component/Process/PhpExecutableFinder.php b/src/Symfony/Component/Process/PhpExecutableFinder.php
index f632a89b4acb..9f943233c410 100644
--- a/src/Symfony/Component/Process/PhpExecutableFinder.php
+++ b/src/Symfony/Component/Process/PhpExecutableFinder.php
@@ -39,7 +39,7 @@ public function find($includeArgs = true)
         $args = $includeArgs && $args ? ' '.implode(' ', $args) : '';
 
         // PHP_BINARY return the current sapi executable
-        if (PHP_BINARY && \in_array(PHP_SAPI, array('cli', 'cli-server', 'phpdbg'), true)) {
+        if (PHP_BINARY && \in_array(\PHP_SAPI, array('cli', 'cli-server', 'phpdbg'), true)) {
             return PHP_BINARY.$args;
         }
 
@@ -57,12 +57,12 @@ public function find($includeArgs = true)
             }
         }
 
-        if (@is_executable($php = PHP_BINDIR.('\\' === DIRECTORY_SEPARATOR ? '\\php.exe' : '/php'))) {
+        if (@is_executable($php = PHP_BINDIR.('\\' === \DIRECTORY_SEPARATOR ? '\\php.exe' : '/php'))) {
             return $php;
         }
 
         $dirs = array(PHP_BINDIR);
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $dirs[] = 'C:\xampp\php\\';
         }
 
@@ -77,7 +77,7 @@ public function find($includeArgs = true)
     public function findArguments()
     {
         $arguments = array();
-        if ('phpdbg' === PHP_SAPI) {
+        if ('phpdbg' === \PHP_SAPI) {
             $arguments[] = '-qrr';
         }
 
diff --git a/src/Symfony/Component/Process/PhpProcess.php b/src/Symfony/Component/Process/PhpProcess.php
index 4c560ef9b222..7ac930e96c72 100644
--- a/src/Symfony/Component/Process/PhpProcess.php
+++ b/src/Symfony/Component/Process/PhpProcess.php
@@ -38,7 +38,7 @@ public function __construct(string $script, string $cwd = null, array $env = nul
         } else {
             $php = array_merge(array($php), $executableFinder->findArguments());
         }
-        if ('phpdbg' === PHP_SAPI) {
+        if ('phpdbg' === \PHP_SAPI) {
             $file = tempnam(sys_get_temp_dir(), 'dbg');
             file_put_contents($file, $script);
             register_shutdown_function('unlink', $file);
diff --git a/src/Symfony/Component/Process/Pipes/AbstractPipes.php b/src/Symfony/Component/Process/Pipes/AbstractPipes.php
index 9a7d88be896f..e5e26866afd9 100644
--- a/src/Symfony/Component/Process/Pipes/AbstractPipes.php
+++ b/src/Symfony/Component/Process/Pipes/AbstractPipes.php
@@ -32,9 +32,9 @@ abstract class AbstractPipes implements PipesInterface
      */
     public function __construct($input)
     {
-        if (is_resource($input) || $input instanceof \Iterator) {
+        if (\is_resource($input) || $input instanceof \Iterator) {
             $this->input = $input;
-        } elseif (is_string($input)) {
+        } elseif (\is_string($input)) {
             $this->inputBuffer = $input;
         } else {
             $this->inputBuffer = (string) $input;
@@ -78,7 +78,7 @@ protected function unblock()
         foreach ($this->pipes as $pipe) {
             stream_set_blocking($pipe, 0);
         }
-        if (is_resource($this->input)) {
+        if (\is_resource($this->input)) {
             stream_set_blocking($this->input, 0);
         }
 
@@ -100,12 +100,12 @@ protected function write()
         if ($input instanceof \Iterator) {
             if (!$input->valid()) {
                 $input = null;
-            } elseif (is_resource($input = $input->current())) {
+            } elseif (\is_resource($input = $input->current())) {
                 stream_set_blocking($input, 0);
             } elseif (!isset($this->inputBuffer[0])) {
-                if (!is_string($input)) {
+                if (!\is_string($input)) {
                     if (!is_scalar($input)) {
-                        throw new InvalidArgumentException(sprintf('%s yielded a value of type "%s", but only scalars and stream resources are supported', get_class($this->input), gettype($input)));
+                        throw new InvalidArgumentException(sprintf('%s yielded a value of type "%s", but only scalars and stream resources are supported', \get_class($this->input), \gettype($input)));
                     }
                     $input = (string) $input;
                 }
diff --git a/src/Symfony/Component/Process/Pipes/WindowsPipes.php b/src/Symfony/Component/Process/Pipes/WindowsPipes.php
index 845d2bf70ebf..9240102a383b 100644
--- a/src/Symfony/Component/Process/Pipes/WindowsPipes.php
+++ b/src/Symfony/Component/Process/Pipes/WindowsPipes.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Process\Pipes;
 
-use Symfony\Component\Process\Process;
 use Symfony\Component\Process\Exception\RuntimeException;
+use Symfony\Component\Process\Process;
 
 /**
  * WindowsPipes implementation uses temporary files as handles.
@@ -141,7 +141,7 @@ public function readAndWrite($blocking, $close = false)
             $data = stream_get_contents($fileHandle, -1, $this->readBytes[$type]);
 
             if (isset($data[0])) {
-                $this->readBytes[$type] += strlen($data);
+                $this->readBytes[$type] += \strlen($data);
                 $read[$type] = $data;
             }
             if ($close) {
diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index 5660daaeb081..8f97ca3e8489 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -138,7 +138,7 @@ class Process implements \IteratorAggregate
      */
     public function __construct($commandline, string $cwd = null, array $env = null, $input = null, ?float $timeout = 60)
     {
-        if (!function_exists('proc_open')) {
+        if (!\function_exists('proc_open')) {
             throw new RuntimeException('The Process class relies on proc_open, which is not available on your PHP installation.');
         }
 
@@ -149,7 +149,7 @@ public function __construct($commandline, string $cwd = null, array $env = null,
         // on Gnu/Linux, PHP builds with --enable-maintainer-zts are also affected
         // @see : https://bugs.php.net/bug.php?id=51800
         // @see : https://bugs.php.net/bug.php?id=50524
-        if (null === $this->cwd && (defined('ZEND_THREAD_SAFE') || '\\' === DIRECTORY_SEPARATOR)) {
+        if (null === $this->cwd && (\defined('ZEND_THREAD_SAFE') || '\\' === \DIRECTORY_SEPARATOR)) {
             $this->cwd = getcwd();
         }
         if (null !== $env) {
@@ -158,7 +158,7 @@ public function __construct($commandline, string $cwd = null, array $env = null,
 
         $this->setInput($input);
         $this->setTimeout($timeout);
-        $this->useFileHandles = '\\' === DIRECTORY_SEPARATOR;
+        $this->useFileHandles = '\\' === \DIRECTORY_SEPARATOR;
         $this->pty = false;
     }
 
@@ -257,10 +257,10 @@ public function start(callable $callback = null, array $env = array())
         $this->hasCallback = null !== $callback;
         $descriptors = $this->getDescriptors();
 
-        if (is_array($commandline = $this->commandline)) {
+        if (\is_array($commandline = $this->commandline)) {
             $commandline = implode(' ', array_map(array($this, 'escapeArgument'), $commandline));
 
-            if ('\\' !== DIRECTORY_SEPARATOR) {
+            if ('\\' !== \DIRECTORY_SEPARATOR) {
                 // exec is mandatory to deal with sending a signal to the process
                 $commandline = 'exec '.$commandline;
             }
@@ -273,7 +273,7 @@ public function start(callable $callback = null, array $env = array())
 
         $options = array('suppress_errors' => true);
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $options['bypass_shell'] = true;
             $commandline = $this->prepareWindowsCommandLine($commandline, $env);
         } elseif (!$this->useFileHandles && $this->isSigchildEnabled()) {
@@ -302,7 +302,7 @@ public function start(callable $callback = null, array $env = array())
 
         $this->process = proc_open($commandline, $descriptors, $this->processPipes->pipes, $this->cwd, $envPairs, $options);
 
-        if (!is_resource($this->process)) {
+        if (!\is_resource($this->process)) {
             throw new RuntimeException('Unable to launch a new process.');
         }
         $this->status = self::STATUS_STARTED;
@@ -380,8 +380,8 @@ public function wait(callable $callback = null)
 
         do {
             $this->checkTimeout();
-            $running = '\\' === DIRECTORY_SEPARATOR ? $this->isRunning() : $this->processPipes->areOpen();
-            $this->readPipes($running, '\\' !== DIRECTORY_SEPARATOR || !$running);
+            $running = '\\' === \DIRECTORY_SEPARATOR ? $this->isRunning() : $this->processPipes->areOpen();
+            $this->readPipes($running, '\\' !== \DIRECTORY_SEPARATOR || !$running);
         } while ($running);
 
         while ($this->isRunning()) {
@@ -882,7 +882,7 @@ public function addErrorOutput(string $line)
      */
     public function getCommandLine()
     {
-        return is_array($this->commandline) ? implode(' ', array_map(array($this, 'escapeArgument'), $this->commandline)) : $this->commandline;
+        return \is_array($this->commandline) ? implode(' ', array_map(array($this, 'escapeArgument'), $this->commandline)) : $this->commandline;
     }
 
     /**
@@ -971,7 +971,7 @@ public function setIdleTimeout($timeout)
      */
     public function setTty($tty)
     {
-        if ('\\' === DIRECTORY_SEPARATOR && $tty) {
+        if ('\\' === \DIRECTORY_SEPARATOR && $tty) {
             throw new RuntimeException('TTY mode is not supported on Windows platform.');
         }
         if ($tty) {
@@ -1084,7 +1084,7 @@ public function setEnv(array $env)
     {
         // Process can not handle env values that are arrays
         $env = array_filter($env, function ($value) {
-            return !is_array($value);
+            return !\is_array($value);
         });
 
         $this->env = $env;
@@ -1180,7 +1180,7 @@ public static function isPtySupported()
             return $result;
         }
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             return $result = false;
         }
 
@@ -1195,7 +1195,7 @@ private function getDescriptors(): array
         if ($this->input instanceof \Iterator) {
             $this->input->rewind();
         }
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->processPipes = new WindowsPipes($this->input, !$this->outputDisabled || $this->hasCallback);
         } else {
             $this->processPipes = new UnixPipes($this->isTty(), $this->isPty(), $this->input, !$this->outputDisabled || $this->hasCallback);
@@ -1219,7 +1219,7 @@ protected function buildCallback(callable $callback = null)
         if ($this->outputDisabled) {
             return function ($type, $data) use ($callback) {
                 if (null !== $callback) {
-                    call_user_func($callback, $type, $data);
+                    \call_user_func($callback, $type, $data);
                 }
             };
         }
@@ -1234,7 +1234,7 @@ protected function buildCallback(callable $callback = null)
             }
 
             if (null !== $callback) {
-                call_user_func($callback, $type, $data);
+                \call_user_func($callback, $type, $data);
             }
         };
     }
@@ -1253,7 +1253,7 @@ protected function updateStatus($blocking)
         $this->processInformation = proc_get_status($this->process);
         $running = $this->processInformation['running'];
 
-        $this->readPipes($running && $blocking, '\\' !== DIRECTORY_SEPARATOR || !$running);
+        $this->readPipes($running && $blocking, '\\' !== \DIRECTORY_SEPARATOR || !$running);
 
         if ($this->fallbackStatus && $this->isSigchildEnabled()) {
             $this->processInformation = $this->fallbackStatus + $this->processInformation;
@@ -1275,7 +1275,7 @@ protected function isSigchildEnabled()
             return self::$sigchild;
         }
 
-        if (!function_exists('phpinfo')) {
+        if (!\function_exists('phpinfo')) {
             return self::$sigchild = false;
         }
 
@@ -1350,7 +1350,7 @@ private function readPipes(bool $blocking, bool $close)
     private function close(): int
     {
         $this->processPipes->close();
-        if (is_resource($this->process)) {
+        if (\is_resource($this->process)) {
             proc_close($this->process);
         }
         $this->exitcode = $this->processInformation['exitcode'];
@@ -1415,7 +1415,7 @@ private function doSignal(int $signal, bool $throwException): bool
             return false;
         }
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             exec(sprintf('taskkill /F /T /PID %d 2>&1', $pid), $output, $exitCode);
             if ($exitCode && $this->isRunning()) {
                 if ($throwException) {
@@ -1427,7 +1427,7 @@ private function doSignal(int $signal, bool $throwException): bool
         } else {
             if (!$this->isSigchildEnabled()) {
                 $ok = @proc_terminate($this->process, $signal);
-            } elseif (function_exists('posix_kill')) {
+            } elseif (\function_exists('posix_kill')) {
                 $ok = @posix_kill($pid, $signal);
             } elseif ($ok = proc_open(sprintf('kill -%d %d', $signal, $pid), array(2 => array('pipe', 'w')), $pipes)) {
                 $ok = false === fgets($pipes[2]);
@@ -1524,7 +1524,7 @@ private function requireProcessIsTerminated(string $functionName)
      */
     private function escapeArgument(string $argument): string
     {
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             return "'".str_replace("'", "'\\''", $argument)."'";
         }
         if ('' === $argument = (string) $argument) {
@@ -1546,13 +1546,13 @@ private function getDefaultEnv()
         $env = array();
 
         foreach ($_SERVER as $k => $v) {
-            if (is_string($v) && false !== $v = getenv($k)) {
+            if (\is_string($v) && false !== $v = getenv($k)) {
                 $env[$k] = $v;
             }
         }
 
         foreach ($_ENV as $k => $v) {
-            if (is_string($v)) {
+            if (\is_string($v)) {
                 $env[$k] = $v;
             }
         }
diff --git a/src/Symfony/Component/Process/ProcessUtils.php b/src/Symfony/Component/Process/ProcessUtils.php
index e0d9c08ab463..2f9c4be4de52 100644
--- a/src/Symfony/Component/Process/ProcessUtils.php
+++ b/src/Symfony/Component/Process/ProcessUtils.php
@@ -42,10 +42,10 @@ private function __construct()
     public static function validateInput($caller, $input)
     {
         if (null !== $input) {
-            if (is_resource($input)) {
+            if (\is_resource($input)) {
                 return $input;
             }
-            if (is_string($input)) {
+            if (\is_string($input)) {
                 return $input;
             }
             if (is_scalar($input)) {
diff --git a/src/Symfony/Component/Process/Tests/ExecutableFinderTest.php b/src/Symfony/Component/Process/Tests/ExecutableFinderTest.php
index 3b2500b7fcf0..c6d063c0ee55 100644
--- a/src/Symfony/Component/Process/Tests/ExecutableFinderTest.php
+++ b/src/Symfony/Component/Process/Tests/ExecutableFinderTest.php
@@ -41,7 +41,7 @@ public function testFind()
             $this->markTestSkipped('Cannot test when open_basedir is set');
         }
 
-        $this->setPath(dirname(PHP_BINARY));
+        $this->setPath(\dirname(PHP_BINARY));
 
         $finder = new ExecutableFinder();
         $result = $finder->find($this->getPhpBinaryName());
@@ -73,7 +73,7 @@ public function testFindWithExtraDirs()
 
         $this->setPath('');
 
-        $extraDirs = array(dirname(PHP_BINARY));
+        $extraDirs = array(\dirname(PHP_BINARY));
 
         $finder = new ExecutableFinder();
         $result = $finder->find($this->getPhpBinaryName(), null, $extraDirs);
@@ -83,7 +83,7 @@ public function testFindWithExtraDirs()
 
     public function testFindWithOpenBaseDir()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Cannot run test on windows');
         }
 
@@ -91,7 +91,7 @@ public function testFindWithOpenBaseDir()
             $this->markTestSkipped('Cannot test when open_basedir is set');
         }
 
-        $this->iniSet('open_basedir', dirname(PHP_BINARY).PATH_SEPARATOR.'/');
+        $this->iniSet('open_basedir', \dirname(PHP_BINARY).PATH_SEPARATOR.'/');
 
         $finder = new ExecutableFinder();
         $result = $finder->find($this->getPhpBinaryName());
@@ -104,7 +104,7 @@ public function testFindProcessInOpenBasedir()
         if (ini_get('open_basedir')) {
             $this->markTestSkipped('Cannot test when open_basedir is set');
         }
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Cannot run test on windows');
         }
 
@@ -125,7 +125,7 @@ public function testFindBatchExecutableOnWindows()
         if (ini_get('open_basedir')) {
             $this->markTestSkipped('Cannot test when open_basedir is set');
         }
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Can be only tested on windows');
         }
 
@@ -149,7 +149,7 @@ public function testFindBatchExecutableOnWindows()
 
     private function assertSamePath($expected, $tested)
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->assertEquals(strtolower($expected), strtolower($tested));
         } else {
             $this->assertEquals($expected, $tested);
@@ -158,6 +158,6 @@ private function assertSamePath($expected, $tested)
 
     private function getPhpBinaryName()
     {
-        return basename(PHP_BINARY, '\\' === DIRECTORY_SEPARATOR ? '.exe' : '');
+        return basename(PHP_BINARY, '\\' === \DIRECTORY_SEPARATOR ? '.exe' : '');
     }
 }
diff --git a/src/Symfony/Component/Process/Tests/PhpExecutableFinderTest.php b/src/Symfony/Component/Process/Tests/PhpExecutableFinderTest.php
index 1055384cc59b..df2560dfc58b 100644
--- a/src/Symfony/Component/Process/Tests/PhpExecutableFinderTest.php
+++ b/src/Symfony/Component/Process/Tests/PhpExecutableFinderTest.php
@@ -27,7 +27,7 @@ public function testFind()
         $f = new PhpExecutableFinder();
 
         $current = PHP_BINARY;
-        $args = 'phpdbg' === PHP_SAPI ? ' -qrr' : '';
+        $args = 'phpdbg' === \PHP_SAPI ? ' -qrr' : '';
 
         $this->assertEquals($current.$args, $f->find(), '::find() returns the executable PHP');
         $this->assertEquals($current, $f->find(false), '::find() returns the executable PHP');
@@ -40,7 +40,7 @@ public function testFindArguments()
     {
         $f = new PhpExecutableFinder();
 
-        if ('phpdbg' === PHP_SAPI) {
+        if ('phpdbg' === \PHP_SAPI) {
             $this->assertEquals($f->findArguments(), array('-qrr'), '::findArguments() returns phpdbg arguments');
         } else {
             $this->assertEquals($f->findArguments(), array(), '::findArguments() returns no arguments');
diff --git a/src/Symfony/Component/Process/Tests/PhpProcessTest.php b/src/Symfony/Component/Process/Tests/PhpProcessTest.php
index f67368c7b358..b0f0a57acefa 100644
--- a/src/Symfony/Component/Process/Tests/PhpProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/PhpProcessTest.php
@@ -43,6 +43,6 @@ public function testCommandLine()
         $process->wait();
         $this->assertContains($commandLine, $process->getCommandLine(), '::getCommandLine() returns the command line of PHP after wait');
 
-        $this->assertSame(PHP_VERSION.PHP_SAPI, $process->getOutput());
+        $this->assertSame(PHP_VERSION.\PHP_SAPI, $process->getOutput());
     }
 }
diff --git a/src/Symfony/Component/Process/Tests/PipeStdinInStdoutStdErrStreamSelect.php b/src/Symfony/Component/Process/Tests/PipeStdinInStdoutStdErrStreamSelect.php
index bbd7ddfeb284..1ea0e127f76b 100644
--- a/src/Symfony/Component/Process/Tests/PipeStdinInStdoutStdErrStreamSelect.php
+++ b/src/Symfony/Component/Process/Tests/PipeStdinInStdoutStdErrStreamSelect.php
@@ -35,22 +35,22 @@
     }
 
     if (in_array(STDOUT, $w) && strlen($out) > 0) {
-        $written = fwrite(STDOUT, (binary) $out, 32768);
+        $written = fwrite(STDOUT, (string) $out, 32768);
         if (false === $written) {
             die(ERR_WRITE_FAILED);
         }
-        $out = (binary) substr($out, $written);
+        $out = (string) substr($out, $written);
     }
     if (null === $read && '' === $out) {
         $write = array_diff($write, array(STDOUT));
     }
 
     if (in_array(STDERR, $w) && strlen($err) > 0) {
-        $written = fwrite(STDERR, (binary) $err, 32768);
+        $written = fwrite(STDERR, (string) $err, 32768);
         if (false === $written) {
             die(ERR_WRITE_FAILED);
         }
-        $err = (binary) substr($err, $written);
+        $err = (string) substr($err, $written);
     }
     if (null === $read && '' === $err) {
         $write = array_diff($write, array(STDERR));
diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index 6b75b00a5493..f96e3c95e3e1 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -32,7 +32,7 @@ class ProcessTest extends TestCase
     public static function setUpBeforeClass()
     {
         $phpBin = new PhpExecutableFinder();
-        self::$phpBin = getenv('SYMFONY_PROCESS_PHP_TEST_BINARY') ?: ('phpdbg' === PHP_SAPI ? 'php' : $phpBin->find());
+        self::$phpBin = getenv('SYMFONY_PROCESS_PHP_TEST_BINARY') ?: ('phpdbg' === \PHP_SAPI ? 'php' : $phpBin->find());
 
         ob_start();
         phpinfo(INFO_GENERAL);
@@ -67,7 +67,7 @@ public function testInvalidCwd()
 
     public function testThatProcessDoesNotThrowWarningDuringRun()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('This test is transient on Windows');
         }
         @trigger_error('Test Error', E_USER_NOTICE);
@@ -162,7 +162,7 @@ public function testAllOutputIsActuallyReadOnTermination()
 
         $o = $p->getOutput();
 
-        $this->assertEquals($expectedOutputSize, strlen($o));
+        $this->assertEquals($expectedOutputSize, \strlen($o));
     }
 
     public function testCallbacksAreExecutedWithStart()
@@ -204,8 +204,8 @@ public function testProcessPipes($code, $size)
         $p->setInput($expected);
         $p->run();
 
-        $this->assertEquals($expectedLength, strlen($p->getOutput()));
-        $this->assertEquals($expectedLength, strlen($p->getErrorOutput()));
+        $this->assertEquals($expectedLength, \strlen($p->getOutput()));
+        $this->assertEquals($expectedLength, \strlen($p->getErrorOutput()));
     }
 
     /**
@@ -226,8 +226,8 @@ public function testSetStreamAsInput($code, $size)
 
         fclose($stream);
 
-        $this->assertEquals($expectedLength, strlen($p->getOutput()));
-        $this->assertEquals($expectedLength, strlen($p->getErrorOutput()));
+        $this->assertEquals($expectedLength, \strlen($p->getOutput()));
+        $this->assertEquals($expectedLength, \strlen($p->getErrorOutput()));
     }
 
     public function testLiveStreamAsInput()
@@ -307,7 +307,7 @@ public function provideInputValues()
 
     public function chainedCommandsOutputProvider()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             return array(
                 array("2 \r\n2\r\n", '&&', '2'),
             );
@@ -426,7 +426,7 @@ public function testFlushOutput()
 
     public function testZeroAsOutput()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             // see http://stackoverflow.com/questions/7105433/windows-batch-echo-without-new-line
             $p = $this->getProcess('echo | set /p dummyName=0');
         } else {
@@ -439,7 +439,7 @@ public function testZeroAsOutput()
 
     public function testExitCodeCommandFailed()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does not support POSIX exit code');
         }
 
@@ -455,7 +455,7 @@ public function testExitCodeCommandFailed()
      */
     public function testTTYCommand()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does not have /dev/tty support');
         }
 
@@ -473,7 +473,7 @@ public function testTTYCommand()
      */
     public function testTTYCommandExitCode()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does have /dev/tty support');
         }
 
@@ -490,7 +490,7 @@ public function testTTYCommandExitCode()
      */
     public function testTTYInWindowsEnvironment()
     {
-        if ('\\' !== DIRECTORY_SEPARATOR) {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('This test is for Windows platform only');
         }
 
@@ -567,7 +567,7 @@ public function testUpdateStatus()
     {
         $process = $this->getProcess('echo foo');
         $process->run();
-        $this->assertGreaterThan(0, strlen($process->getOutput()));
+        $this->assertGreaterThan(0, \strlen($process->getOutput()));
     }
 
     public function testGetExitCodeIsNullOnStart()
@@ -654,7 +654,7 @@ public function testIsNotSuccessful()
 
     public function testProcessIsNotSignaled()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does not support POSIX signals');
         }
 
@@ -665,7 +665,7 @@ public function testProcessIsNotSignaled()
 
     public function testProcessWithoutTermSignal()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does not support POSIX signals');
         }
 
@@ -676,7 +676,7 @@ public function testProcessWithoutTermSignal()
 
     public function testProcessIsSignaledIfStopped()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does not support POSIX signals');
         }
 
@@ -693,7 +693,7 @@ public function testProcessIsSignaledIfStopped()
      */
     public function testProcessThrowsExceptionWhenExternallySignaled()
     {
-        if (!function_exists('posix_kill')) {
+        if (!\function_exists('posix_kill')) {
             $this->markTestSkipped('Function posix_kill is required.');
         }
 
@@ -997,7 +997,7 @@ public function provideMethodsThatNeedATerminatedProcess()
      */
     public function testWrongSignal()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('POSIX signals do not work on Windows');
         }
 
@@ -1152,7 +1152,7 @@ public function pipesCodeProvider()
             'include \''.__DIR__.'/PipeStdinInStdoutStdErrStreamSelect.php\';',
         );
 
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             // Avoid XL buffers on Windows because of https://bugs.php.net/bug.php?id=65650
             $sizes = array(1, 2, 4, 8);
         } else {
@@ -1430,7 +1430,7 @@ public function testGetCommandLine()
     {
         $p = new Process(array('/usr/bin/php'));
 
-        $expected = '\\' === DIRECTORY_SEPARATOR ? '"/usr/bin/php"' : "'/usr/bin/php'";
+        $expected = '\\' === \DIRECTORY_SEPARATOR ? '"/usr/bin/php"' : "'/usr/bin/php'";
         $this->assertSame($expected, $p->getCommandLine());
     }
 
@@ -1477,7 +1477,7 @@ public function provideEscapeArgument()
     public function testEnvArgument()
     {
         $env = array('FOO' => 'Foo', 'BAR' => 'Bar');
-        $cmd = '\\' === DIRECTORY_SEPARATOR ? 'echo !FOO! !BAR! !BAZ!' : 'echo $FOO $BAR $BAZ';
+        $cmd = '\\' === \DIRECTORY_SEPARATOR ? 'echo !FOO! !BAR! !BAZ!' : 'echo $FOO $BAR $BAZ';
         $p = new Process($cmd, null, $env);
         $p->run(null, array('BAR' => 'baR', 'BAZ' => 'baZ'));
 
diff --git a/src/Symfony/Component/PropertyAccess/Exception/UnexpectedTypeException.php b/src/Symfony/Component/PropertyAccess/Exception/UnexpectedTypeException.php
index c2b0492130cc..a7311329a8f9 100644
--- a/src/Symfony/Component/PropertyAccess/Exception/UnexpectedTypeException.php
+++ b/src/Symfony/Component/PropertyAccess/Exception/UnexpectedTypeException.php
@@ -30,7 +30,7 @@ public function __construct($value, PropertyPathInterface $path, int $pathIndex)
         $message = sprintf(
             'PropertyAccessor requires a graph of objects or arrays to operate on, '.
             'but it found type "%s" while trying to traverse path "%s" at property "%s".',
-            gettype($value),
+            \gettype($value),
             (string) $path,
             $path->getElement($pathIndex)
         );
diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
index 40a2ae047e81..2bf9d5db387f 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
@@ -89,7 +89,7 @@ public function getValue($objectOrArray, $propertyPath)
         );
         $propertyValues = $this->readPropertiesUntil($zval, $propertyPath, $propertyPath->getLength(), $this->ignoreInvalidIndices);
 
-        return $propertyValues[count($propertyValues) - 1][self::VALUE];
+        return $propertyValues[\count($propertyValues) - 1][self::VALUE];
     }
 
     /**
@@ -107,7 +107,7 @@ public function setValue(&$objectOrArray, $propertyPath, $value)
         $overwrite = true;
 
         try {
-            for ($i = count($propertyValues) - 1; 0 <= $i; --$i) {
+            for ($i = \count($propertyValues) - 1; 0 <= $i; --$i) {
                 $zval = $propertyValues[$i];
                 unset($propertyValues[$i]);
 
@@ -143,7 +143,7 @@ public function setValue(&$objectOrArray, $propertyPath, $value)
                     // if current element's reference chain is not broken - current element
                     // as well as all its ancients in the property path are all passed by reference,
                     // then there is no need to continue the value setting process
-                    if (is_object($zval[self::VALUE]) || isset($zval[self::IS_REF_CHAINED])) {
+                    if (\is_object($zval[self::VALUE]) || isset($zval[self::IS_REF_CHAINED])) {
                         break;
                     }
                 }
@@ -162,9 +162,9 @@ private static function throwInvalidArgumentException($message, $trace, $i)
     {
         if (isset($trace[$i]['file']) && __FILE__ === $trace[$i]['file'] && isset($trace[$i]['args'][0])) {
             $pos = strpos($message, $delim = 'must be of the type ') ?: (strpos($message, $delim = 'must be an instance of ') ?: strpos($message, $delim = 'must implement interface '));
-            $pos += strlen($delim);
+            $pos += \strlen($delim);
             $type = $trace[$i]['args'][0];
-            $type = is_object($type) ? get_class($type) : gettype($type);
+            $type = \is_object($type) ? \get_class($type) : \gettype($type);
 
             throw new InvalidArgumentException(sprintf('Expected argument of type "%s", "%s" given', substr($message, $pos, strpos($message, ',', $pos) - $pos), $type));
         }
@@ -206,12 +206,12 @@ public function isWritable($objectOrArray, $propertyPath)
             );
             $propertyValues = $this->readPropertiesUntil($zval, $propertyPath, $propertyPath->getLength() - 1);
 
-            for ($i = count($propertyValues) - 1; 0 <= $i; --$i) {
+            for ($i = \count($propertyValues) - 1; 0 <= $i; --$i) {
                 $zval = $propertyValues[$i];
                 unset($propertyValues[$i]);
 
                 if ($propertyPath->isIndex($i)) {
-                    if (!$zval[self::VALUE] instanceof \ArrayAccess && !is_array($zval[self::VALUE])) {
+                    if (!$zval[self::VALUE] instanceof \ArrayAccess && !\is_array($zval[self::VALUE])) {
                         return false;
                     }
                 } else {
@@ -220,7 +220,7 @@ public function isWritable($objectOrArray, $propertyPath)
                     }
                 }
 
-                if (is_object($zval[self::VALUE])) {
+                if (\is_object($zval[self::VALUE])) {
                     return true;
                 }
             }
@@ -248,7 +248,7 @@ public function isWritable($objectOrArray, $propertyPath)
      */
     private function readPropertiesUntil($zval, PropertyPathInterface $propertyPath, $lastIndex, $ignoreInvalidIndices = true)
     {
-        if (!is_object($zval[self::VALUE]) && !is_array($zval[self::VALUE])) {
+        if (!\is_object($zval[self::VALUE]) && !\is_array($zval[self::VALUE])) {
             throw new UnexpectedTypeException($zval[self::VALUE], $propertyPath, 0);
         }
 
@@ -262,10 +262,10 @@ private function readPropertiesUntil($zval, PropertyPathInterface $propertyPath,
             if ($isIndex) {
                 // Create missing nested arrays on demand
                 if (($zval[self::VALUE] instanceof \ArrayAccess && !$zval[self::VALUE]->offsetExists($property)) ||
-                    (is_array($zval[self::VALUE]) && !isset($zval[self::VALUE][$property]) && !array_key_exists($property, $zval[self::VALUE]))
+                    (\is_array($zval[self::VALUE]) && !isset($zval[self::VALUE][$property]) && !array_key_exists($property, $zval[self::VALUE]))
                 ) {
                     if (!$ignoreInvalidIndices) {
-                        if (!is_array($zval[self::VALUE])) {
+                        if (!\is_array($zval[self::VALUE])) {
                             if (!$zval[self::VALUE] instanceof \Traversable) {
                                 throw new NoSuchIndexException(sprintf(
                                     'Cannot read index "%s" while trying to traverse path "%s".',
@@ -301,7 +301,7 @@ private function readPropertiesUntil($zval, PropertyPathInterface $propertyPath,
             }
 
             // the final value of the path must not be validated
-            if ($i + 1 < $propertyPath->getLength() && !is_object($zval[self::VALUE]) && !is_array($zval[self::VALUE])) {
+            if ($i + 1 < $propertyPath->getLength() && !\is_object($zval[self::VALUE]) && !\is_array($zval[self::VALUE])) {
                 throw new UnexpectedTypeException($zval[self::VALUE], $propertyPath, $i + 1);
             }
 
@@ -332,8 +332,8 @@ private function readPropertiesUntil($zval, PropertyPathInterface $propertyPath,
      */
     private function readIndex($zval, $index)
     {
-        if (!$zval[self::VALUE] instanceof \ArrayAccess && !is_array($zval[self::VALUE])) {
-            throw new NoSuchIndexException(sprintf('Cannot read index "%s" from object of type "%s" because it doesn\'t implement \ArrayAccess.', $index, get_class($zval[self::VALUE])));
+        if (!$zval[self::VALUE] instanceof \ArrayAccess && !\is_array($zval[self::VALUE])) {
+            throw new NoSuchIndexException(sprintf('Cannot read index "%s" from object of type "%s" because it doesn\'t implement \ArrayAccess.', $index, \get_class($zval[self::VALUE])));
         }
 
         $result = self::$resultProto;
@@ -343,9 +343,9 @@ private function readIndex($zval, $index)
 
             if (!isset($zval[self::REF])) {
                 // Save creating references when doing read-only lookups
-            } elseif (is_array($zval[self::VALUE])) {
+            } elseif (\is_array($zval[self::VALUE])) {
                 $result[self::REF] = &$zval[self::REF][$index];
-            } elseif (is_object($result[self::VALUE])) {
+            } elseif (\is_object($result[self::VALUE])) {
                 $result[self::REF] = $result[self::VALUE];
             }
         }
@@ -365,13 +365,13 @@ private function readIndex($zval, $index)
      */
     private function readProperty($zval, $property)
     {
-        if (!is_object($zval[self::VALUE])) {
+        if (!\is_object($zval[self::VALUE])) {
             throw new NoSuchPropertyException(sprintf('Cannot read property "%s" from an array. Maybe you intended to write the property path as "[%1$s]" instead.', $property));
         }
 
         $result = self::$resultProto;
         $object = $zval[self::VALUE];
-        $access = $this->getReadAccessInfo(get_class($object), $property);
+        $access = $this->getReadAccessInfo(\get_class($object), $property);
 
         if (self::ACCESS_TYPE_METHOD === $access[self::ACCESS_TYPE]) {
             $result[self::VALUE] = $object->{$access[self::ACCESS_NAME]}();
@@ -400,7 +400,7 @@ private function readProperty($zval, $property)
         }
 
         // Objects are always passed around by reference
-        if (isset($zval[self::REF]) && is_object($result[self::VALUE])) {
+        if (isset($zval[self::REF]) && \is_object($result[self::VALUE])) {
             $result[self::REF] = $result[self::VALUE];
         }
 
@@ -498,8 +498,8 @@ private function getReadAccessInfo($class, $property)
      */
     private function writeIndex($zval, $index, $value)
     {
-        if (!$zval[self::VALUE] instanceof \ArrayAccess && !is_array($zval[self::VALUE])) {
-            throw new NoSuchIndexException(sprintf('Cannot modify index "%s" in object of type "%s" because it doesn\'t implement \ArrayAccess', $index, get_class($zval[self::VALUE])));
+        if (!$zval[self::VALUE] instanceof \ArrayAccess && !\is_array($zval[self::VALUE])) {
+            throw new NoSuchIndexException(sprintf('Cannot modify index "%s" in object of type "%s" because it doesn\'t implement \ArrayAccess', $index, \get_class($zval[self::VALUE])));
         }
 
         $zval[self::REF][$index] = $value;
@@ -516,12 +516,12 @@ private function writeIndex($zval, $index, $value)
      */
     private function writeProperty($zval, $property, $value)
     {
-        if (!is_object($zval[self::VALUE])) {
+        if (!\is_object($zval[self::VALUE])) {
             throw new NoSuchPropertyException(sprintf('Cannot write property "%s" to an array. Maybe you should write the property path as "[%1$s]" instead?', $property));
         }
 
         $object = $zval[self::VALUE];
-        $access = $this->getWriteAccessInfo(get_class($object), $property, $value);
+        $access = $this->getWriteAccessInfo(\get_class($object), $property, $value);
 
         if (self::ACCESS_TYPE_METHOD === $access[self::ACCESS_TYPE]) {
             $object->{$access[self::ACCESS_NAME]}($value);
@@ -540,7 +540,7 @@ private function writeProperty($zval, $property, $value)
         } elseif (self::ACCESS_TYPE_MAGIC === $access[self::ACCESS_TYPE]) {
             $object->{$access[self::ACCESS_NAME]}($value);
         } elseif (self::ACCESS_TYPE_NOT_FOUND === $access[self::ACCESS_TYPE]) {
-            throw new NoSuchPropertyException(sprintf('Could not determine access type for property "%s" in class "%s".', $property, get_class($object)));
+            throw new NoSuchPropertyException(sprintf('Could not determine access type for property "%s" in class "%s".', $property, \get_class($object)));
         } else {
             throw new NoSuchPropertyException($access[self::ACCESS_NAME]);
         }
@@ -564,12 +564,12 @@ private function writeCollection($zval, $property, $collection, $addMethod, $rem
         if ($previousValue instanceof \Traversable) {
             $previousValue = iterator_to_array($previousValue);
         }
-        if ($previousValue && is_array($previousValue)) {
-            if (is_object($collection)) {
+        if ($previousValue && \is_array($previousValue)) {
+            if (\is_object($collection)) {
                 $collection = iterator_to_array($collection);
             }
             foreach ($previousValue as $key => $item) {
-                if (!in_array($item, $collection, true)) {
+                if (!\in_array($item, $collection, true)) {
                     unset($previousValue[$key]);
                     $zval[self::VALUE]->{$removeMethod}($item);
                 }
@@ -579,7 +579,7 @@ private function writeCollection($zval, $property, $collection, $addMethod, $rem
         }
 
         foreach ($collection as $item) {
-            if (!$previousValue || !in_array($item, $previousValue, true)) {
+            if (!$previousValue || !\in_array($item, $previousValue, true)) {
                 $zval[self::VALUE]->{$addMethod}($item);
             }
         }
@@ -612,7 +612,7 @@ private function getWriteAccessInfo(string $class, string $property, $value): ar
         $camelized = $this->camelize($property);
         $singulars = (array) Inflector::singularize($camelized);
 
-        if (is_array($value) || $value instanceof \Traversable) {
+        if (\is_array($value) || $value instanceof \Traversable) {
             $methods = $this->findAdderAndRemover($reflClass, $singulars);
 
             if (null !== $methods) {
@@ -651,7 +651,7 @@ private function getWriteAccessInfo(string $class, string $property, $value): ar
                     $property,
                     $reflClass->name,
                     implode('()", "', $methods),
-                    is_object($value) ? get_class($value) : gettype($value)
+                    \is_object($value) ? \get_class($value) : \gettype($value)
                 );
             } else {
                 $access[self::ACCESS_TYPE] = self::ACCESS_TYPE_NOT_FOUND;
@@ -683,11 +683,11 @@ private function getWriteAccessInfo(string $class, string $property, $value): ar
      */
     private function isPropertyWritable($object, string $property): bool
     {
-        if (!is_object($object)) {
+        if (!\is_object($object)) {
             return false;
         }
 
-        $access = $this->getWriteAccessInfo(get_class($object), $property, array());
+        $access = $this->getWriteAccessInfo(\get_class($object), $property, array());
 
         return self::ACCESS_TYPE_METHOD === $access[self::ACCESS_TYPE]
             || self::ACCESS_TYPE_PROPERTY === $access[self::ACCESS_TYPE]
diff --git a/src/Symfony/Component/PropertyAccess/PropertyPath.php b/src/Symfony/Component/PropertyAccess/PropertyPath.php
index 51b6599bf360..890b8ffce61b 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyPath.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyPath.php
@@ -76,12 +76,12 @@ public function __construct($propertyPath)
 
             return;
         }
-        if (!is_string($propertyPath)) {
+        if (!\is_string($propertyPath)) {
             throw new InvalidArgumentException(sprintf(
                 'The property path constructor needs a string or an instance of '.
                 '"Symfony\Component\PropertyAccess\PropertyPath". '.
                 'Got: "%s"',
-                is_object($propertyPath) ? get_class($propertyPath) : gettype($propertyPath)
+                \is_object($propertyPath) ? \get_class($propertyPath) : \gettype($propertyPath)
             ));
         }
 
@@ -107,7 +107,7 @@ public function __construct($propertyPath)
 
             $this->elements[] = $element;
 
-            $position += strlen($matches[1]);
+            $position += \strlen($matches[1]);
             $remaining = $matches[4];
             $pattern = '/^(\.([^\.|\[]++)|\[([^\]]++)\])(.*)/';
         }
@@ -121,7 +121,7 @@ public function __construct($propertyPath)
             ));
         }
 
-        $this->length = count($this->elements);
+        $this->length = \count($this->elements);
     }
 
     /**
diff --git a/src/Symfony/Component/PropertyAccess/PropertyPathBuilder.php b/src/Symfony/Component/PropertyAccess/PropertyPathBuilder.php
index cecf67300f5e..12e6f5e5247a 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyPathBuilder.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyPathBuilder.php
@@ -45,7 +45,7 @@ public function __construct($path = null)
      */
     public function append($path, $offset = 0, $length = 0)
     {
-        if (is_string($path)) {
+        if (\is_string($path)) {
             $path = new PropertyPath($path);
         }
 
@@ -115,7 +115,7 @@ public function remove($offset, $length = 1)
      */
     public function replace($offset, $length, $path, $pathOffset = 0, $pathLength = 0)
     {
-        if (is_string($path)) {
+        if (\is_string($path)) {
             $path = new PropertyPath($path);
         }
 
@@ -187,7 +187,7 @@ public function replaceByProperty($offset, $name = null)
      */
     public function getLength()
     {
-        return count($this->elements);
+        return \count($this->elements);
     }
 
     /**
@@ -240,7 +240,7 @@ private function resize($offset, $cutLength, $insertionLength)
             return;
         }
 
-        $length = count($this->elements);
+        $length = \count($this->elements);
 
         if ($cutLength > $insertionLength) {
             // More elements should be removed than inserted
diff --git a/src/Symfony/Component/PropertyAccess/Tests/Fixtures/NonTraversableArrayObject.php b/src/Symfony/Component/PropertyAccess/Tests/Fixtures/NonTraversableArrayObject.php
index fd00a730b831..d2ff935851a5 100644
--- a/src/Symfony/Component/PropertyAccess/Tests/Fixtures/NonTraversableArrayObject.php
+++ b/src/Symfony/Component/PropertyAccess/Tests/Fixtures/NonTraversableArrayObject.php
@@ -50,7 +50,7 @@ public function offsetUnset($offset)
 
     public function count()
     {
-        return count($this->array);
+        return \count($this->array);
     }
 
     public function serialize()
diff --git a/src/Symfony/Component/PropertyAccess/Tests/Fixtures/TraversableArrayObject.php b/src/Symfony/Component/PropertyAccess/Tests/Fixtures/TraversableArrayObject.php
index 3bd9795e6b25..6758f18fbcc4 100644
--- a/src/Symfony/Component/PropertyAccess/Tests/Fixtures/TraversableArrayObject.php
+++ b/src/Symfony/Component/PropertyAccess/Tests/Fixtures/TraversableArrayObject.php
@@ -55,7 +55,7 @@ public function getIterator()
 
     public function count()
     {
-        return count($this->array);
+        return \count($this->array);
     }
 
     public function serialize()
diff --git a/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCollectionTest.php b/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCollectionTest.php
index 1f1026230524..8a7ab1042b32 100644
--- a/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCollectionTest.php
+++ b/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCollectionTest.php
@@ -105,7 +105,7 @@ public function testSetValueCallsAdderAndRemoverForCollections()
         $axesBefore = $this->getContainer(array(1 => 'second', 3 => 'fourth', 4 => 'fifth'));
         $axesMerged = $this->getContainer(array(1 => 'first', 2 => 'second', 3 => 'third'));
         $axesAfter = $this->getContainer(array(1 => 'second', 5 => 'first', 6 => 'third'));
-        $axesMergedCopy = is_object($axesMerged) ? clone $axesMerged : $axesMerged;
+        $axesMergedCopy = \is_object($axesMerged) ? clone $axesMerged : $axesMerged;
 
         // Don't use a mock in order to test whether the collections are
         // modified while iterating them
diff --git a/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php b/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
index f160be61f325..5ac744d645b3 100644
--- a/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
+++ b/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
@@ -16,11 +16,11 @@
 use Symfony\Component\PropertyAccess\Exception\NoSuchIndexException;
 use Symfony\Component\PropertyAccess\PropertyAccessor;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\TestClass;
+use Symfony\Component\PropertyAccess\Tests\Fixtures\TestClassIsWritable;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\TestClassMagicCall;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\TestClassMagicGet;
-use Symfony\Component\PropertyAccess\Tests\Fixtures\Ticket5775Object;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\TestClassSetValue;
-use Symfony\Component\PropertyAccess\Tests\Fixtures\TestClassIsWritable;
+use Symfony\Component\PropertyAccess\Tests\Fixtures\Ticket5775Object;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\TypeHinted;
 
 class PropertyAccessorTest extends TestCase
diff --git a/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php b/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
index b0713aa93fe3..8b1ae6c666fd 100644
--- a/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
+++ b/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
@@ -267,7 +267,7 @@ private function getMutatorMethod(string $class, string $property): ?array
 
         foreach ($this->mutatorPrefixes as $prefix) {
             $names = array($ucProperty);
-            if (in_array($prefix, $this->arrayMutatorPrefixes)) {
+            if (\in_array($prefix, $this->arrayMutatorPrefixes)) {
                 $names = array_merge($names, $ucSingulars);
             }
 
@@ -296,7 +296,7 @@ private function getPropertyName(string $methodName, array $reflectionProperties
         $pattern = implode('|', array_merge($this->accessorPrefixes, $this->mutatorPrefixes));
 
         if ('' !== $pattern && preg_match('/^('.$pattern.')(.+)$/i', $methodName, $matches)) {
-            if (!in_array($matches[1], $this->arrayMutatorPrefixes)) {
+            if (!\in_array($matches[1], $this->arrayMutatorPrefixes)) {
                 return $matches[2];
             }
 
diff --git a/src/Symfony/Component/PropertyInfo/Extractor/SerializerExtractor.php b/src/Symfony/Component/PropertyInfo/Extractor/SerializerExtractor.php
index 6afbb542e18d..7a311e6b0818 100644
--- a/src/Symfony/Component/PropertyInfo/Extractor/SerializerExtractor.php
+++ b/src/Symfony/Component/PropertyInfo/Extractor/SerializerExtractor.php
@@ -35,7 +35,7 @@ public function __construct(ClassMetadataFactoryInterface $classMetadataFactory)
      */
     public function getProperties($class, array $context = array())
     {
-        if (!isset($context['serializer_groups']) || !is_array($context['serializer_groups'])) {
+        if (!isset($context['serializer_groups']) || !\is_array($context['serializer_groups'])) {
             return;
         }
 
diff --git a/src/Symfony/Component/PropertyInfo/PropertyInfoCacheExtractor.php b/src/Symfony/Component/PropertyInfo/PropertyInfoCacheExtractor.php
index ecb6adde2a98..90fd8a0fb863 100644
--- a/src/Symfony/Component/PropertyInfo/PropertyInfoCacheExtractor.php
+++ b/src/Symfony/Component/PropertyInfo/PropertyInfoCacheExtractor.php
@@ -91,7 +91,7 @@ private function extract(string $method, array $arguments)
             $serializedArguments = serialize($arguments);
         } catch (\Exception $exception) {
             // If arguments are not serializable, skip the cache
-            return call_user_func_array(array($this->propertyInfoExtractor, $method), $arguments);
+            return \call_user_func_array(array($this->propertyInfoExtractor, $method), $arguments);
         }
 
         // Calling rawurlencode escapes special characters not allowed in PSR-6's keys
@@ -107,7 +107,7 @@ private function extract(string $method, array $arguments)
             return $this->arrayCache[$key] = $item->get();
         }
 
-        $value = call_user_func_array(array($this->propertyInfoExtractor, $method), $arguments);
+        $value = \call_user_func_array(array($this->propertyInfoExtractor, $method), $arguments);
         $item->set($value);
         $this->cacheItemPool->save($item);
 
diff --git a/src/Symfony/Component/PropertyInfo/Tests/Fixtures/NullExtractor.php b/src/Symfony/Component/PropertyInfo/Tests/Fixtures/NullExtractor.php
index 4c2af4112045..1f263bfc3cd7 100644
--- a/src/Symfony/Component/PropertyInfo/Tests/Fixtures/NullExtractor.php
+++ b/src/Symfony/Component/PropertyInfo/Tests/Fixtures/NullExtractor.php
@@ -78,8 +78,8 @@ public function getProperties($class, array $context = array())
 
     private function assertIsString($string)
     {
-        if (!is_string($string)) {
-            throw new \InvalidArgumentException(sprintf('"%s" expects strings, given "%s".', __CLASS__, gettype($string)));
+        if (!\is_string($string)) {
+            throw new \InvalidArgumentException(sprintf('"%s" expects strings, given "%s".', __CLASS__, \gettype($string)));
         }
     }
 }
diff --git a/src/Symfony/Component/PropertyInfo/Type.php b/src/Symfony/Component/PropertyInfo/Type.php
index 461495ed510a..1a33e29abd9b 100644
--- a/src/Symfony/Component/PropertyInfo/Type.php
+++ b/src/Symfony/Component/PropertyInfo/Type.php
@@ -61,7 +61,7 @@ class Type
      */
     public function __construct(string $builtinType, bool $nullable = false, string $class = null, bool $collection = false, self $collectionKeyType = null, self $collectionValueType = null)
     {
-        if (!in_array($builtinType, self::$builtinTypes)) {
+        if (!\in_array($builtinType, self::$builtinTypes)) {
             throw new \InvalidArgumentException(sprintf('"%s" is not a valid PHP type.', $builtinType));
         }
 
diff --git a/src/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php b/src/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php
index 7a1a9e03c918..afddf4739506 100644
--- a/src/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php
+++ b/src/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php
@@ -63,7 +63,7 @@ public function getTypes(DocType $varType): array
         $nullable = $nullable || false !== $nullKey;
 
         // Remove the null type from the type if other types are defined
-        if ($nullable && false !== $nullKey && count($varTypes) > 1) {
+        if ($nullable && false !== $nullKey && \count($varTypes) > 1) {
             unset($varTypes[$nullKey]);
         }
 
@@ -137,7 +137,7 @@ private function normalizeType(string $docType): string
 
     private function getPhpTypeAndClass(string $docType): array
     {
-        if (in_array($docType, Type::$builtinTypes)) {
+        if (\in_array($docType, Type::$builtinTypes)) {
             return array($docType, null);
         }
 
diff --git a/src/Symfony/Component/Routing/Annotation/Route.php b/src/Symfony/Component/Routing/Annotation/Route.php
index 5b3cbeaab184..da47cea4e09d 100644
--- a/src/Symfony/Component/Routing/Annotation/Route.php
+++ b/src/Symfony/Component/Routing/Annotation/Route.php
@@ -46,7 +46,7 @@ public function __construct(array $data)
         foreach ($data as $key => $value) {
             $method = 'set'.str_replace('_', '', $key);
             if (!method_exists($this, $method)) {
-                throw new \BadMethodCallException(sprintf('Unknown property "%s" on annotation "%s".', $key, get_class($this)));
+                throw new \BadMethodCallException(sprintf('Unknown property "%s" on annotation "%s".', $key, \get_class($this)));
             }
             $this->$method($value);
         }
@@ -114,7 +114,7 @@ public function getDefaults()
 
     public function setSchemes($schemes)
     {
-        $this->schemes = is_array($schemes) ? $schemes : array($schemes);
+        $this->schemes = \is_array($schemes) ? $schemes : array($schemes);
     }
 
     public function getSchemes()
@@ -124,7 +124,7 @@ public function getSchemes()
 
     public function setMethods($methods)
     {
-        $this->methods = is_array($methods) ? $methods : array($methods);
+        $this->methods = \is_array($methods) ? $methods : array($methods);
     }
 
     public function getMethods()
diff --git a/src/Symfony/Component/Routing/DependencyInjection/RoutingResolverPass.php b/src/Symfony/Component/Routing/DependencyInjection/RoutingResolverPass.php
index a5116c99f23a..ab0b7d8e07f1 100644
--- a/src/Symfony/Component/Routing/DependencyInjection/RoutingResolverPass.php
+++ b/src/Symfony/Component/Routing/DependencyInjection/RoutingResolverPass.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Routing\DependencyInjection;
 
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\PriorityTaggedServiceTrait;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Adds tagged routing.loader services to routing.resolver service.
diff --git a/src/Symfony/Component/Routing/Generator/UrlGenerator.php b/src/Symfony/Component/Routing/Generator/UrlGenerator.php
index 02a59a925397..6ed70cabdfc2 100644
--- a/src/Symfony/Component/Routing/Generator/UrlGenerator.php
+++ b/src/Symfony/Component/Routing/Generator/UrlGenerator.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Routing\Generator;
 
-use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\RequestContext;
+use Psr\Log\LoggerInterface;
 use Symfony\Component\Routing\Exception\InvalidParameterException;
-use Symfony\Component\Routing\Exception\RouteNotFoundException;
 use Symfony\Component\Routing\Exception\MissingMandatoryParametersException;
-use Psr\Log\LoggerInterface;
+use Symfony\Component\Routing\Exception\RouteNotFoundException;
+use Symfony\Component\Routing\RequestContext;
+use Symfony\Component\Routing\RouteCollection;
 
 /**
  * UrlGenerator can generate a URL or a path for any route in the RouteCollection
@@ -185,7 +185,7 @@ protected function doGenerate($variables, $defaults, $requirements, $tokens, $pa
         $scheme = $this->context->getScheme();
 
         if ($requiredSchemes) {
-            if (!in_array($scheme, $requiredSchemes, true)) {
+            if (!\in_array($scheme, $requiredSchemes, true)) {
                 $referenceType = self::ABSOLUTE_URL;
                 $scheme = current($requiredSchemes);
             }
@@ -308,7 +308,7 @@ public static function getRelativePath($basePath, $targetPath)
         }
 
         $targetDirs[] = $targetFile;
-        $path = str_repeat('../', count($sourceDirs)).implode('/', $targetDirs);
+        $path = str_repeat('../', \count($sourceDirs)).implode('/', $targetDirs);
 
         // A reference to the same base directory or an empty subdirectory must be prefixed with "./".
         // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
index fd1d2b655ab2..8c96835826a9 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Routing\Loader;
 
 use Doctrine\Common\Annotations\Reader;
+use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\Config\Loader\LoaderResolverInterface;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Config\Loader\LoaderInterface;
-use Symfony\Component\Config\Loader\LoaderResolverInterface;
 
 /**
  * AnnotationClassLoader loads routing information from a PHP class and its methods.
@@ -174,7 +174,7 @@ protected function addRoute(RouteCollection $collection, $annot, $globals, \Refl
      */
     public function supports($resource, $type = null)
     {
-        return is_string($resource) && preg_match('/^(?:\\\\?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)+$/', $resource) && (!$type || 'annotation' === $type);
+        return \is_string($resource) && preg_match('/^(?:\\\\?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)+$/', $resource) && (!$type || 'annotation' === $type);
     }
 
     /**
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
index 4574a0201c0c..3fb70ea20b43 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Routing\Loader;
 
-use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Config\Resource\DirectoryResource;
+use Symfony\Component\Routing\RouteCollection;
 
 /**
  * AnnotationDirectoryLoader loads routing information from annotations set
@@ -80,7 +80,7 @@ public function supports($resource, $type = null)
             return true;
         }
 
-        if ($type || !is_string($resource)) {
+        if ($type || !\is_string($resource)) {
             return false;
         }
 
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
index b1cb104b58e7..ecd68e04f526 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Routing\Loader;
 
-use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Config\Resource\FileResource;
-use Symfony\Component\Config\Loader\FileLoader;
 use Symfony\Component\Config\FileLocatorInterface;
+use Symfony\Component\Config\Loader\FileLoader;
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\RouteCollection;
 
 /**
  * AnnotationFileLoader loads routing information from annotations set
@@ -31,7 +31,7 @@ class AnnotationFileLoader extends FileLoader
      */
     public function __construct(FileLocatorInterface $locator, AnnotationClassLoader $loader)
     {
-        if (!function_exists('token_get_all')) {
+        if (!\function_exists('token_get_all')) {
             throw new \RuntimeException('The Tokenizer extension is required for the routing annotation loaders.');
         }
 
@@ -71,7 +71,7 @@ public function load($file, $type = null)
      */
     public function supports($resource, $type = null)
     {
-        return is_string($resource) && 'php' === pathinfo($resource, PATHINFO_EXTENSION) && (!$type || 'annotation' === $type);
+        return \is_string($resource) && 'php' === pathinfo($resource, PATHINFO_EXTENSION) && (!$type || 'annotation' === $type);
     }
 
     /**
@@ -87,7 +87,7 @@ protected function findClass($file)
         $namespace = false;
         $tokens = token_get_all(file_get_contents($file));
 
-        if (1 === count($tokens) && T_INLINE_HTML === $tokens[0][0]) {
+        if (1 === \count($tokens) && T_INLINE_HTML === $tokens[0][0]) {
             throw new \InvalidArgumentException(sprintf('The file "%s" does not contain PHP code. Did you forgot to add the "<?php" start tag at the beginning of the file?', $file));
         }
 
@@ -104,7 +104,7 @@ protected function findClass($file)
 
             if (true === $namespace && T_STRING === $token[0]) {
                 $namespace = $token[1];
-                while (isset($tokens[++$i][1]) && in_array($tokens[$i][0], array(T_NS_SEPARATOR, T_STRING))) {
+                while (isset($tokens[++$i][1]) && \in_array($tokens[$i][0], array(T_NS_SEPARATOR, T_STRING))) {
                     $namespace .= $tokens[$i][1];
                 }
                 $token = $tokens[$i];
@@ -121,7 +121,7 @@ protected function findClass($file)
                     if (T_DOUBLE_COLON === $tokens[$j][0] || T_NEW === $tokens[$j][0]) {
                         $skipClassToken = true;
                         break;
-                    } elseif (!in_array($tokens[$j][0], array(T_WHITESPACE, T_DOC_COMMENT, T_COMMENT))) {
+                    } elseif (!\in_array($tokens[$j][0], array(T_WHITESPACE, T_DOC_COMMENT, T_COMMENT))) {
                         break;
                     }
                 }
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php b/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
index 172fc9eef202..a315cfb4ad07 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
@@ -38,9 +38,9 @@ public function __construct(RouteCollection $collection, PhpFileLoader $loader,
      */
     final public function import($resource, $type = null, $ignoreErrors = false)
     {
-        $this->loader->setCurrentDir(dirname($this->path));
+        $this->loader->setCurrentDir(\dirname($this->path));
         $imported = $this->loader->import($resource, $type, $ignoreErrors, $this->file);
-        if (!is_array($imported)) {
+        if (!\is_array($imported)) {
             return new ImportConfigurator($this->collection, $imported);
         }
 
diff --git a/src/Symfony/Component/Routing/Loader/DirectoryLoader.php b/src/Symfony/Component/Routing/Loader/DirectoryLoader.php
index 4bb5b31b60a8..08e833e0a1ea 100644
--- a/src/Symfony/Component/Routing/Loader/DirectoryLoader.php
+++ b/src/Symfony/Component/Routing/Loader/DirectoryLoader.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Routing\Loader;
 
 use Symfony\Component\Config\Loader\FileLoader;
-use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Config\Resource\DirectoryResource;
+use Symfony\Component\Routing\RouteCollection;
 
 class DirectoryLoader extends FileLoader
 {
diff --git a/src/Symfony/Component/Routing/Loader/ObjectRouteLoader.php b/src/Symfony/Component/Routing/Loader/ObjectRouteLoader.php
index 0899a818129b..12fc2bbe16e9 100644
--- a/src/Symfony/Component/Routing/Loader/ObjectRouteLoader.php
+++ b/src/Symfony/Component/Routing/Loader/ObjectRouteLoader.php
@@ -45,7 +45,7 @@ abstract protected function getServiceObject($id);
     public function load($resource, $type = null)
     {
         $parts = explode(':', $resource);
-        if (2 != count($parts)) {
+        if (2 != \count($parts)) {
             throw new \InvalidArgumentException(sprintf('Invalid resource "%s" passed to the "service" route loader: use the format "service_name:methodName"', $resource));
         }
 
@@ -54,20 +54,20 @@ public function load($resource, $type = null)
 
         $loaderObject = $this->getServiceObject($serviceString);
 
-        if (!is_object($loaderObject)) {
-            throw new \LogicException(sprintf('%s:getServiceObject() must return an object: %s returned', get_class($this), gettype($loaderObject)));
+        if (!\is_object($loaderObject)) {
+            throw new \LogicException(sprintf('%s:getServiceObject() must return an object: %s returned', \get_class($this), \gettype($loaderObject)));
         }
 
         if (!method_exists($loaderObject, $method)) {
-            throw new \BadMethodCallException(sprintf('Method "%s" not found on "%s" when importing routing resource "%s"', $method, get_class($loaderObject), $resource));
+            throw new \BadMethodCallException(sprintf('Method "%s" not found on "%s" when importing routing resource "%s"', $method, \get_class($loaderObject), $resource));
         }
 
-        $routeCollection = call_user_func(array($loaderObject, $method), $this);
+        $routeCollection = \call_user_func(array($loaderObject, $method), $this);
 
         if (!$routeCollection instanceof RouteCollection) {
-            $type = is_object($routeCollection) ? get_class($routeCollection) : gettype($routeCollection);
+            $type = \is_object($routeCollection) ? \get_class($routeCollection) : \gettype($routeCollection);
 
-            throw new \LogicException(sprintf('The %s::%s method must return a RouteCollection: %s returned', get_class($loaderObject), $method, $type));
+            throw new \LogicException(sprintf('The %s::%s method must return a RouteCollection: %s returned', \get_class($loaderObject), $method, $type));
         }
 
         // make the service file tracked so that if it changes, the cache rebuilds
diff --git a/src/Symfony/Component/Routing/Loader/PhpFileLoader.php b/src/Symfony/Component/Routing/Loader/PhpFileLoader.php
index 3fcd692f9256..9e009387dddd 100644
--- a/src/Symfony/Component/Routing/Loader/PhpFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/PhpFileLoader.php
@@ -36,7 +36,7 @@ class PhpFileLoader extends FileLoader
     public function load($file, $type = null)
     {
         $path = $this->locator->locate($file);
-        $this->setCurrentDir(dirname($path));
+        $this->setCurrentDir(\dirname($path));
 
         // the closure forbids access to the private scope in the included file
         $loader = $this;
@@ -63,7 +63,7 @@ public function load($file, $type = null)
      */
     public function supports($resource, $type = null)
     {
-        return is_string($resource) && 'php' === pathinfo($resource, PATHINFO_EXTENSION) && (!$type || 'php' === $type);
+        return \is_string($resource) && 'php' === pathinfo($resource, PATHINFO_EXTENSION) && (!$type || 'php' === $type);
     }
 }
 
diff --git a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
index f3f66055e675..689245b5ac40 100644
--- a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Routing\Loader;
 
-use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\Route;
-use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\Loader\FileLoader;
+use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\Util\XmlUtils;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
 
 /**
  * XmlFileLoader loads XML routing files.
@@ -93,7 +93,7 @@ protected function parseNode(RouteCollection $collection, \DOMElement $node, $pa
      */
     public function supports($resource, $type = null)
     {
-        return is_string($resource) && 'xml' === pathinfo($resource, PATHINFO_EXTENSION) && (!$type || 'xml' === $type);
+        return \is_string($resource) && 'xml' === pathinfo($resource, PATHINFO_EXTENSION) && (!$type || 'xml' === $type);
     }
 
     /**
@@ -144,11 +144,11 @@ protected function parseImport(RouteCollection $collection, \DOMElement $node, $
 
         list($defaults, $requirements, $options, $condition) = $this->parseConfigs($node, $path);
 
-        $this->setCurrentDir(dirname($path));
+        $this->setCurrentDir(\dirname($path));
 
         $imported = $this->import($resource, ('' !== $type ? $type : null), false, $file);
 
-        if (!is_array($imported)) {
+        if (!\is_array($imported)) {
             $imported = array($imported);
         }
 
diff --git a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
index 20aad3c5297f..c4ce83f75725 100644
--- a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Routing\Loader;
 
-use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\Route;
+use Symfony\Component\Config\Loader\FileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Parser as YamlParser;
-use Symfony\Component\Config\Loader\FileLoader;
 
 /**
  * YamlFileLoader loads Yaml routing files.
@@ -72,7 +72,7 @@ public function load($file, $type = null)
         }
 
         // not an array
-        if (!is_array($parsedConfig)) {
+        if (!\is_array($parsedConfig)) {
             throw new \InvalidArgumentException(sprintf('The file "%s" must contain a YAML array.', $path));
         }
 
@@ -94,7 +94,7 @@ public function load($file, $type = null)
      */
     public function supports($resource, $type = null)
     {
-        return is_string($resource) && in_array(pathinfo($resource, PATHINFO_EXTENSION), array('yml', 'yaml'), true) && (!$type || 'yaml' === $type);
+        return \is_string($resource) && \in_array(pathinfo($resource, PATHINFO_EXTENSION), array('yml', 'yaml'), true) && (!$type || 'yaml' === $type);
     }
 
     /**
@@ -148,11 +148,11 @@ protected function parseImport(RouteCollection $collection, array $config, $path
             $defaults['_controller'] = $config['controller'];
         }
 
-        $this->setCurrentDir(dirname($path));
+        $this->setCurrentDir(\dirname($path));
 
         $imported = $this->import($config['resource'], $type, false, $file);
 
-        if (!is_array($imported)) {
+        if (!\is_array($imported)) {
             $imported = array($imported);
         }
 
@@ -191,7 +191,7 @@ protected function parseImport(RouteCollection $collection, array $config, $path
      */
     protected function validate($config, $name, $path)
     {
-        if (!is_array($config)) {
+        if (!\is_array($config)) {
             throw new \InvalidArgumentException(sprintf('The definition of "%s" in "%s" must be a YAML array.', $name, $path));
         }
         if ($extraKeys = array_diff(array_keys($config), self::$availableKeys)) {
diff --git a/src/Symfony/Component/Routing/Matcher/Dumper/PhpMatcherDumper.php b/src/Symfony/Component/Routing/Matcher/Dumper/PhpMatcherDumper.php
index 40d8df67ed6e..ac1f8f813598 100644
--- a/src/Symfony/Component/Routing/Matcher/Dumper/PhpMatcherDumper.php
+++ b/src/Symfony/Component/Routing/Matcher/Dumper/PhpMatcherDumper.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Routing\Matcher\Dumper;
 
+use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
-use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
 
 /**
  * PhpMatcherDumper creates a PHP class able to match URLs for a given set of routes.
@@ -236,10 +236,10 @@ private function compileRoute(Route $route, $name, $supportsRedirections, $paren
         $hostMatches = false;
         $methods = $route->getMethods();
 
-        $supportsTrailingSlash = $supportsRedirections && (!$methods || in_array('GET', $methods));
+        $supportsTrailingSlash = $supportsRedirections && (!$methods || \in_array('GET', $methods));
         $regex = $compiledRoute->getRegex();
 
-        if (!count($compiledRoute->getPathVariables()) && false !== preg_match('#^(.)\^(?P<url>.*?)\$\1#'.('u' === substr($regex, -1) ? 'u' : ''), $regex, $m)) {
+        if (!\count($compiledRoute->getPathVariables()) && false !== preg_match('#^(.)\^(?P<url>.*?)\$\1#'.('u' === substr($regex, -1) ? 'u' : ''), $regex, $m)) {
             if ($supportsTrailingSlash && '/' === substr($m['url'], -1)) {
                 $conditions[] = sprintf('%s === $trimmedPathinfo', var_export(rtrim(str_replace('\\', '', $m['url']), '/'), true));
                 $hasTrailingSlash = true;
@@ -279,7 +279,7 @@ private function compileRoute(Route $route, $name, $supportsRedirections, $paren
         $gotoname = 'not_'.preg_replace('/[^A-Za-z0-9_]/', '', $name);
 
         // the offset where the return value is appended below, with indendation
-        $retOffset = 12 + strlen($code);
+        $retOffset = 12 + \strlen($code);
 
         // optimize parameters array
         if ($matches || $hostMatches) {
@@ -318,7 +318,7 @@ private function compileRoute(Route $route, $name, $supportsRedirections, $paren
         }
 
         if ($methods) {
-            $methodVariable = in_array('GET', $methods) ? '$canonicalMethod' : '$requestMethod';
+            $methodVariable = \in_array('GET', $methods) ? '$canonicalMethod' : '$requestMethod';
             $methods = implode("', '", $methods);
         }
 
diff --git a/src/Symfony/Component/Routing/Matcher/Dumper/StaticPrefixCollection.php b/src/Symfony/Component/Routing/Matcher/Dumper/StaticPrefixCollection.php
index e0117890cdf2..1e5ad9031ec2 100644
--- a/src/Symfony/Component/Routing/Matcher/Dumper/StaticPrefixCollection.php
+++ b/src/Symfony/Component/Routing/Matcher/Dumper/StaticPrefixCollection.php
@@ -69,7 +69,7 @@ public function addRoute(string $prefix, $route)
             // This is needed because otherwise routes that come afterwards have higher precedence
             // than a possible regular expression, which goes against the input order sorting.
             $this->items[] = array($prefix, $route);
-            $this->matchStart = count($this->items);
+            $this->matchStart = \count($this->items);
 
             return;
         }
@@ -145,9 +145,9 @@ private function accepts(string $prefix): bool
      */
     private function detectCommonPrefix(string $prefix, string $anotherPrefix)
     {
-        $baseLength = strlen($this->prefix);
+        $baseLength = \strlen($this->prefix);
         $commonLength = $baseLength;
-        $end = min(strlen($prefix), strlen($anotherPrefix));
+        $end = min(\strlen($prefix), \strlen($anotherPrefix));
 
         for ($i = $baseLength; $i <= $end; ++$i) {
             if (substr($prefix, 0, $i) !== substr($anotherPrefix, 0, $i)) {
@@ -159,7 +159,7 @@ private function detectCommonPrefix(string $prefix, string $anotherPrefix)
 
         $commonPrefix = rtrim(substr($prefix, 0, $commonLength), '/');
 
-        if (strlen($commonPrefix) > $baseLength) {
+        if (\strlen($commonPrefix) > $baseLength) {
             return $commonPrefix;
         }
 
@@ -194,7 +194,7 @@ public function optimizeGroups(): void
 
     private function shouldBeInlined(): bool
     {
-        if (count($this->items) >= 3) {
+        if (\count($this->items) >= 3) {
             return false;
         }
 
@@ -205,7 +205,7 @@ private function shouldBeInlined(): bool
         }
 
         foreach ($this->items as $item) {
-            if (is_array($item) && $item[0] === $this->prefix) {
+            if (\is_array($item) && $item[0] === $this->prefix) {
                 return false;
             }
         }
diff --git a/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php b/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php
index 3770a9c24c5e..67805205c72c 100644
--- a/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/RedirectableUrlMatcher.php
@@ -27,7 +27,7 @@ public function match($pathinfo)
         try {
             $parameters = parent::match($pathinfo);
         } catch (ResourceNotFoundException $e) {
-            if ('/' === substr($pathinfo, -1) || !in_array($this->context->getMethod(), array('HEAD', 'GET'))) {
+            if ('/' === substr($pathinfo, -1) || !\in_array($this->context->getMethod(), array('HEAD', 'GET'))) {
                 throw $e;
             }
 
diff --git a/src/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php b/src/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php
index 1eef778a56bc..0c193ff2d1f0 100644
--- a/src/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php
+++ b/src/Symfony/Component/Routing/Matcher/RequestMatcherInterface.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Routing\Matcher;
 
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\NoConfigurationException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
-use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 
 /**
  * RequestMatcherInterface is the interface that all request matcher classes must implement.
diff --git a/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php b/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
index 9085be042488..61cad8e692f1 100644
--- a/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
@@ -69,7 +69,7 @@ protected function matchCollection($pathinfo, RouteCollection $routes)
                     $r = new Route($route->getPath(), $route->getDefaults(), array($n => $regex), $route->getOptions());
                     $cr = $r->compile();
 
-                    if (in_array($n, $cr->getVariables()) && !preg_match($cr->getRegex(), $pathinfo)) {
+                    if (\in_array($n, $cr->getVariables()) && !preg_match($cr->getRegex(), $pathinfo)) {
                         $this->addTrace(sprintf('Requirement for "%s" does not match (%s)', $n, $regex), self::ROUTE_ALMOST_MATCHES, $name, $route);
 
                         continue 2;
@@ -94,7 +94,7 @@ protected function matchCollection($pathinfo, RouteCollection $routes)
                     $method = 'GET';
                 }
 
-                if (!in_array($method, $requiredMethods)) {
+                if (!\in_array($method, $requiredMethods)) {
                     $this->allow = array_merge($this->allow, $requiredMethods);
 
                     $this->addTrace(sprintf('Method "%s" does not match any of the required methods (%s)', $this->context->getMethod(), implode(', ', $requiredMethods)), self::ROUTE_ALMOST_MATCHES, $name, $route);
diff --git a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
index 445cfc4e8710..ec3a05c95f30 100644
--- a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
@@ -11,15 +11,15 @@
 
 namespace Symfony\Component\Routing\Matcher;
 
+use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\NoConfigurationException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
-use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Routing\RequestContext;
 use Symfony\Component\Routing\Route;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
-use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
+use Symfony\Component\Routing\RouteCollection;
 
 /**
  * UrlMatcher matches URL based on a set of routes.
@@ -80,7 +80,7 @@ public function match($pathinfo)
             throw new NoConfigurationException();
         }
 
-        throw 0 < count($this->allow)
+        throw 0 < \count($this->allow)
             ? new MethodNotAllowedException(array_unique($this->allow))
             : new ResourceNotFoundException(sprintf('No routes found for "%s".', $pathinfo));
     }
@@ -148,7 +148,7 @@ protected function matchCollection($pathinfo, RouteCollection $routes)
                     $method = 'GET';
                 }
 
-                if (!in_array($method, $requiredMethods)) {
+                if (!\in_array($method, $requiredMethods)) {
                     if (self::REQUIREMENT_MATCH === $status[0]) {
                         $this->allow = array_merge($this->allow, $requiredMethods);
                     }
@@ -215,7 +215,7 @@ protected function handleRouteRequirements($pathinfo, $name, Route $route)
     protected function mergeDefaults($params, $defaults)
     {
         foreach ($params as $key => $value) {
-            if (!is_int($key)) {
+            if (!\is_int($key)) {
                 $defaults[$key] = $value;
             }
         }
diff --git a/src/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php b/src/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php
index 2c7c3135bc66..17f1f97b3b47 100644
--- a/src/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php
+++ b/src/Symfony/Component/Routing/Matcher/UrlMatcherInterface.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Routing\Matcher;
 
+use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\NoConfigurationException;
-use Symfony\Component\Routing\RequestContextAwareInterface;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
-use Symfony\Component\Routing\Exception\MethodNotAllowedException;
+use Symfony\Component\Routing\RequestContextAwareInterface;
 
 /**
  * UrlMatcherInterface is the interface that all URL matcher classes must implement.
diff --git a/src/Symfony/Component/Routing/Route.php b/src/Symfony/Component/Routing/Route.php
index 29d352aebd17..cdbd9d90c745 100644
--- a/src/Symfony/Component/Routing/Route.php
+++ b/src/Symfony/Component/Routing/Route.php
@@ -196,7 +196,7 @@ public function setSchemes($schemes)
      */
     public function hasScheme($scheme)
     {
-        return in_array(strtolower($scheme), $this->schemes, true);
+        return \in_array(strtolower($scheme), $this->schemes, true);
     }
 
     /**
@@ -537,7 +537,7 @@ public function compile()
 
     private function sanitizeRequirement($key, $regex)
     {
-        if (!is_string($regex)) {
+        if (!\is_string($regex)) {
             throw new \InvalidArgumentException(sprintf('Routing requirement for "%s" must be a string.', $key));
         }
 
diff --git a/src/Symfony/Component/Routing/RouteCollection.php b/src/Symfony/Component/Routing/RouteCollection.php
index e22cbc5f2e0c..c42229af2878 100644
--- a/src/Symfony/Component/Routing/RouteCollection.php
+++ b/src/Symfony/Component/Routing/RouteCollection.php
@@ -63,7 +63,7 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->routes);
+        return \count($this->routes);
     }
 
     /**
diff --git a/src/Symfony/Component/Routing/RouteCollectionBuilder.php b/src/Symfony/Component/Routing/RouteCollectionBuilder.php
index c98d642a0665..d5ff578c5dd3 100644
--- a/src/Symfony/Component/Routing/RouteCollectionBuilder.php
+++ b/src/Symfony/Component/Routing/RouteCollectionBuilder.php
@@ -358,7 +358,7 @@ private function load($resource, string $type = null): array
         if ($this->loader->supports($resource, $type)) {
             $collections = $this->loader->load($resource, $type);
 
-            return is_array($collections) ? $collections : array($collections);
+            return \is_array($collections) ? $collections : array($collections);
         }
 
         if (null === $resolver = $this->loader->getResolver()) {
@@ -371,6 +371,6 @@ private function load($resource, string $type = null): array
 
         $collections = $loader->load($resource, $type);
 
-        return is_array($collections) ? $collections : array($collections);
+        return \is_array($collections) ? $collections : array($collections);
     }
 }
diff --git a/src/Symfony/Component/Routing/RouteCompiler.php b/src/Symfony/Component/Routing/RouteCompiler.php
index 7ec10fa3b460..2fbd3a60059d 100644
--- a/src/Symfony/Component/Routing/RouteCompiler.php
+++ b/src/Symfony/Component/Routing/RouteCompiler.php
@@ -116,9 +116,9 @@ private static function compilePattern(Route $route, $pattern, $isHost)
             $varName = substr($match[0][0], 1, -1);
             // get all static text preceding the current variable
             $precedingText = substr($pattern, $pos, $match[0][1] - $pos);
-            $pos = $match[0][1] + strlen($match[0][0]);
+            $pos = $match[0][1] + \strlen($match[0][0]);
 
-            if (!strlen($precedingText)) {
+            if (!\strlen($precedingText)) {
                 $precedingChar = '';
             } elseif ($useUtf8) {
                 preg_match('/.$/u', $precedingText, $precedingChar);
@@ -133,17 +133,17 @@ private static function compilePattern(Route $route, $pattern, $isHost)
             if (preg_match('/^\d/', $varName)) {
                 throw new \DomainException(sprintf('Variable name "%s" cannot start with a digit in route pattern "%s". Please use a different name.', $varName, $pattern));
             }
-            if (in_array($varName, $variables)) {
+            if (\in_array($varName, $variables)) {
                 throw new \LogicException(sprintf('Route pattern "%s" cannot reference variable name "%s" more than once.', $pattern, $varName));
             }
 
-            if (strlen($varName) > self::VARIABLE_MAXIMUM_LENGTH) {
+            if (\strlen($varName) > self::VARIABLE_MAXIMUM_LENGTH) {
                 throw new \DomainException(sprintf('Variable name "%s" cannot be longer than %s characters in route pattern "%s". Please use a shorter name.', $varName, self::VARIABLE_MAXIMUM_LENGTH, $pattern));
             }
 
             if ($isSeparator && $precedingText !== $precedingChar) {
-                $tokens[] = array('text', substr($precedingText, 0, -strlen($precedingChar)));
-            } elseif (!$isSeparator && strlen($precedingText) > 0) {
+                $tokens[] = array('text', substr($precedingText, 0, -\strlen($precedingChar)));
+            } elseif (!$isSeparator && \strlen($precedingText) > 0) {
                 $tokens[] = array('text', $precedingText);
             }
 
@@ -186,14 +186,14 @@ private static function compilePattern(Route $route, $pattern, $isHost)
             $variables[] = $varName;
         }
 
-        if ($pos < strlen($pattern)) {
+        if ($pos < \strlen($pattern)) {
             $tokens[] = array('text', substr($pattern, $pos));
         }
 
         // find the first optional token
         $firstOptional = PHP_INT_MAX;
         if (!$isHost) {
-            for ($i = count($tokens) - 1; $i >= 0; --$i) {
+            for ($i = \count($tokens) - 1; $i >= 0; --$i) {
                 $token = $tokens[$i];
                 if ('variable' === $token[0] && $route->hasDefault($token[3])) {
                     $firstOptional = $i;
@@ -205,7 +205,7 @@ private static function compilePattern(Route $route, $pattern, $isHost)
 
         // compute the matching regexp
         $regexp = '';
-        for ($i = 0, $nbToken = count($tokens); $i < $nbToken; ++$i) {
+        for ($i = 0, $nbToken = \count($tokens); $i < $nbToken; ++$i) {
             $regexp .= self::computeRegexp($tokens, $i, $firstOptional);
         }
         $regexp = self::REGEX_DELIMITER.'^'.$regexp.'$'.self::REGEX_DELIMITER.'sD'.($isHost ? 'i' : '');
@@ -213,7 +213,7 @@ private static function compilePattern(Route $route, $pattern, $isHost)
         // enable Utf8 matching if really required
         if ($needsUtf8) {
             $regexp .= 'u';
-            for ($i = 0, $nbToken = count($tokens); $i < $nbToken; ++$i) {
+            for ($i = 0, $nbToken = \count($tokens); $i < $nbToken; ++$i) {
                 if ('variable' === $tokens[$i][0]) {
                     $tokens[$i][] = true;
                 }
@@ -293,7 +293,7 @@ private static function computeRegexp(array $tokens, int $index, int $firstOptio
                     // "?:" means it is non-capturing, i.e. the portion of the subject string that
                     // matched the optional subpattern is not passed back.
                     $regexp = "(?:$regexp";
-                    $nbTokens = count($tokens);
+                    $nbTokens = \count($tokens);
                     if ($nbTokens - 1 == $index) {
                         // Close the optional subpatterns
                         $regexp .= str_repeat(')?', $nbTokens - $firstOptional - (0 === $firstOptional ? 1 : 0));
diff --git a/src/Symfony/Component/Routing/Router.php b/src/Symfony/Component/Routing/Router.php
index ed56332ecd5f..56842a4d3b86 100644
--- a/src/Symfony/Component/Routing/Router.php
+++ b/src/Symfony/Component/Routing/Router.php
@@ -11,19 +11,19 @@
 
 namespace Symfony\Component\Routing;
 
-use Symfony\Component\Config\Loader\LoaderInterface;
-use Symfony\Component\Config\ConfigCacheInterface;
-use Symfony\Component\Config\ConfigCacheFactoryInterface;
-use Symfony\Component\Config\ConfigCacheFactory;
 use Psr\Log\LoggerInterface;
+use Symfony\Component\Config\ConfigCacheFactory;
+use Symfony\Component\Config\ConfigCacheFactoryInterface;
+use Symfony\Component\Config\ConfigCacheInterface;
+use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\Generator\ConfigurableRequirementsInterface;
-use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\Component\Routing\Generator\Dumper\GeneratorDumperInterface;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Routing\Matcher\Dumper\MatcherDumperInterface;
 use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
 use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
-use Symfony\Component\Routing\Matcher\Dumper\MatcherDumperInterface;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
 
 /**
  * The Router class is an example of the integration of all pieces of the
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/CustomXmlFileLoader.php b/src/Symfony/Component/Routing/Tests/Fixtures/CustomXmlFileLoader.php
index 9fd5754a160a..b7a02b60b0ae 100644
--- a/src/Symfony/Component/Routing/Tests/Fixtures/CustomXmlFileLoader.php
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/CustomXmlFileLoader.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Routing\Tests\Fixtures;
 
-use Symfony\Component\Routing\Loader\XmlFileLoader;
 use Symfony\Component\Config\Util\XmlUtils;
+use Symfony\Component\Routing\Loader\XmlFileLoader;
 
 /**
  * XmlFileLoader with schema validation turned off.
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/RedirectableUrlMatcher.php b/src/Symfony/Component/Routing/Tests/Fixtures/RedirectableUrlMatcher.php
index 15937bcf02d1..08b67a076778 100644
--- a/src/Symfony/Component/Routing/Tests/Fixtures/RedirectableUrlMatcher.php
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/RedirectableUrlMatcher.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Routing\Tests\Fixtures;
 
-use Symfony\Component\Routing\Matcher\UrlMatcher;
 use Symfony\Component\Routing\Matcher\RedirectableUrlMatcherInterface;
+use Symfony\Component\Routing\Matcher\UrlMatcher;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/validpattern.php b/src/Symfony/Component/Routing/Tests/Fixtures/validpattern.php
index edc16d8c2cb2..52ddfde0208f 100644
--- a/src/Symfony/Component/Routing/Tests/Fixtures/validpattern.php
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/validpattern.php
@@ -1,7 +1,7 @@
 <?php
 
-use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
 
 $collection = new RouteCollection();
 $collection->add('blog_show', new Route(
diff --git a/src/Symfony/Component/Routing/Tests/Generator/Dumper/PhpGeneratorDumperTest.php b/src/Symfony/Component/Routing/Tests/Generator/Dumper/PhpGeneratorDumperTest.php
index 4b2e5b196dc0..d1c2de4a87da 100644
--- a/src/Symfony/Component/Routing/Tests/Generator/Dumper/PhpGeneratorDumperTest.php
+++ b/src/Symfony/Component/Routing/Tests/Generator/Dumper/PhpGeneratorDumperTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Routing\Tests\Generator\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
-use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\Generator\Dumper\PhpGeneratorDumper;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\Component\Routing\RequestContext;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
 
 class PhpGeneratorDumperTest extends TestCase
 {
@@ -46,8 +46,8 @@ protected function setUp()
 
         $this->routeCollection = new RouteCollection();
         $this->generatorDumper = new PhpGeneratorDumper($this->routeCollection);
-        $this->testTmpFilepath = sys_get_temp_dir().DIRECTORY_SEPARATOR.'php_generator.'.$this->getName().'.php';
-        $this->largeTestTmpFilepath = sys_get_temp_dir().DIRECTORY_SEPARATOR.'php_generator.'.$this->getName().'.large.php';
+        $this->testTmpFilepath = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'php_generator.'.$this->getName().'.php';
+        $this->largeTestTmpFilepath = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'php_generator.'.$this->getName().'.large.php';
         @unlink($this->testTmpFilepath);
         @unlink($this->largeTestTmpFilepath);
     }
diff --git a/src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php b/src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php
index 68add771b718..d4bf18ccac92 100644
--- a/src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php
+++ b/src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Routing\Tests\Generator;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\Generator\UrlGenerator;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\Component\Routing\RequestContext;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
 
 class UrlGeneratorTest extends TestCase
 {
diff --git a/src/Symfony/Component/Routing/Tests/Loader/AnnotationClassLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/AnnotationClassLoaderTest.php
index 32e401294ec8..beab0b2e835a 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/AnnotationClassLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/AnnotationClassLoaderTest.php
@@ -127,17 +127,17 @@ public function testLoad($className, $routeData = array(), $methodArgs = array()
 
         $this->assertSame($routeData['path'], $route->getPath(), '->load preserves path annotation');
         $this->assertCount(
-            count($routeData['requirements']),
+            \count($routeData['requirements']),
             array_intersect_assoc($routeData['requirements'], $route->getRequirements()),
             '->load preserves requirements annotation'
         );
         $this->assertCount(
-            count($routeData['options']),
+            \count($routeData['options']),
             array_intersect_assoc($routeData['options'], $route->getOptions()),
             '->load preserves options annotation'
         );
         $this->assertCount(
-            count($routeData['defaults']),
+            \count($routeData['defaults']),
             $route->getDefaults(),
             '->load preserves defaults annotation'
         );
diff --git a/src/Symfony/Component/Routing/Tests/Loader/AnnotationDirectoryLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/AnnotationDirectoryLoaderTest.php
index 8a6668e0c2be..901b858d91cd 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/AnnotationDirectoryLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/AnnotationDirectoryLoaderTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Routing\Tests\Loader;
 
-use Symfony\Component\Routing\Loader\AnnotationDirectoryLoader;
 use Symfony\Component\Config\FileLocator;
+use Symfony\Component\Routing\Loader\AnnotationDirectoryLoader;
 
 class AnnotationDirectoryLoaderTest extends AbstractAnnotationLoaderTest
 {
@@ -100,10 +100,10 @@ public function testLoadFileIfLocatedResourceIsFile()
 
     private function expectAnnotationsToBeReadFrom(array $classes)
     {
-        $this->reader->expects($this->exactly(count($classes)))
+        $this->reader->expects($this->exactly(\count($classes)))
             ->method('getClassAnnotation')
             ->with($this->callback(function (\ReflectionClass $class) use ($classes) {
-                return in_array($class->getName(), $classes);
+                return \in_array($class->getName(), $classes);
             }));
     }
 }
diff --git a/src/Symfony/Component/Routing/Tests/Loader/AnnotationFileLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/AnnotationFileLoaderTest.php
index ad5d6ad40cff..50e212b3d7e9 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/AnnotationFileLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/AnnotationFileLoaderTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Routing\Tests\Loader;
 
-use Symfony\Component\Routing\Loader\AnnotationFileLoader;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Routing\Annotation\Route;
+use Symfony\Component\Routing\Loader\AnnotationFileLoader;
 
 class AnnotationFileLoaderTest extends AbstractAnnotationLoaderTest
 {
diff --git a/src/Symfony/Component/Routing/Tests/Loader/DirectoryLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/DirectoryLoaderTest.php
index fc29d371ed15..45968551b245 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/DirectoryLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/DirectoryLoaderTest.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Routing\Tests\Loader;
 
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\Config\Loader\LoaderResolver;
+use Symfony\Component\Routing\Loader\AnnotationFileLoader;
 use Symfony\Component\Routing\Loader\DirectoryLoader;
 use Symfony\Component\Routing\Loader\YamlFileLoader;
-use Symfony\Component\Routing\Loader\AnnotationFileLoader;
-use Symfony\Component\Config\Loader\LoaderResolver;
-use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Routing\RouteCollection;
 
 class DirectoryLoaderTest extends AbstractAnnotationLoaderTest
diff --git a/src/Symfony/Component/Routing/Tests/Loader/GlobFileLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/GlobFileLoaderTest.php
index 08d806a8a4af..e4e12b8815c3 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/GlobFileLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/GlobFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Routing\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Config\Resource\GlobResource;
 use Symfony\Component\Config\FileLocator;
+use Symfony\Component\Config\Resource\GlobResource;
 use Symfony\Component\Routing\Loader\GlobFileLoader;
 use Symfony\Component\Routing\RouteCollection;
 
diff --git a/src/Symfony/Component/Routing/Tests/Loader/YamlFileLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/YamlFileLoaderTest.php
index 822bddf1f0c3..a89c58443f7d 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/YamlFileLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/YamlFileLoaderTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Config\FileLocator;
-use Symfony\Component\Routing\Loader\YamlFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\Loader\YamlFileLoader;
 
 class YamlFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Routing/Tests/Matcher/DumpedRedirectableUrlMatcherTest.php b/src/Symfony/Component/Routing/Tests/Matcher/DumpedRedirectableUrlMatcherTest.php
index cfbb524d3aa7..1785c3ad20f4 100644
--- a/src/Symfony/Component/Routing/Tests/Matcher/DumpedRedirectableUrlMatcherTest.php
+++ b/src/Symfony/Component/Routing/Tests/Matcher/DumpedRedirectableUrlMatcherTest.php
@@ -14,8 +14,8 @@
 use Symfony\Component\Routing\Matcher\Dumper\PhpMatcherDumper;
 use Symfony\Component\Routing\Matcher\RedirectableUrlMatcherInterface;
 use Symfony\Component\Routing\Matcher\UrlMatcher;
-use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Routing\RequestContext;
+use Symfony\Component\Routing\RouteCollection;
 
 class DumpedRedirectableUrlMatcherTest extends RedirectableUrlMatcherTest
 {
diff --git a/src/Symfony/Component/Routing/Tests/Matcher/DumpedUrlMatcherTest.php b/src/Symfony/Component/Routing/Tests/Matcher/DumpedUrlMatcherTest.php
index 880b2b13b111..b00dfdf5fa8d 100644
--- a/src/Symfony/Component/Routing/Tests/Matcher/DumpedUrlMatcherTest.php
+++ b/src/Symfony/Component/Routing/Tests/Matcher/DumpedUrlMatcherTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Routing\Tests\Matcher;
 
 use Symfony\Component\Routing\Matcher\Dumper\PhpMatcherDumper;
-use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Routing\RequestContext;
+use Symfony\Component\Routing\RouteCollection;
 
 class DumpedUrlMatcherTest extends UrlMatcherTest
 {
diff --git a/src/Symfony/Component/Routing/Tests/Matcher/Dumper/PhpMatcherDumperTest.php b/src/Symfony/Component/Routing/Tests/Matcher/Dumper/PhpMatcherDumperTest.php
index f29a6d6a30a1..66e858a82fd6 100644
--- a/src/Symfony/Component/Routing/Tests/Matcher/Dumper/PhpMatcherDumperTest.php
+++ b/src/Symfony/Component/Routing/Tests/Matcher/Dumper/PhpMatcherDumperTest.php
@@ -36,7 +36,7 @@ protected function setUp()
         parent::setUp();
 
         $this->matcherClass = uniqid('ProjectUrlMatcher');
-        $this->dumpPath = sys_get_temp_dir().DIRECTORY_SEPARATOR.'php_matcher.'.$this->matcherClass.'.php';
+        $this->dumpPath = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'php_matcher.'.$this->matcherClass.'.php';
     }
 
     protected function tearDown()
diff --git a/src/Symfony/Component/Routing/Tests/Matcher/RedirectableUrlMatcherTest.php b/src/Symfony/Component/Routing/Tests/Matcher/RedirectableUrlMatcherTest.php
index 7984391e1210..0f3cdeabac39 100644
--- a/src/Symfony/Component/Routing/Tests/Matcher/RedirectableUrlMatcherTest.php
+++ b/src/Symfony/Component/Routing/Tests/Matcher/RedirectableUrlMatcherTest.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Routing\Tests\Matcher;
 
+use Symfony\Component\Routing\RequestContext;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\RequestContext;
 
 class RedirectableUrlMatcherTest extends UrlMatcherTest
 {
diff --git a/src/Symfony/Component/Routing/Tests/Matcher/TraceableUrlMatcherTest.php b/src/Symfony/Component/Routing/Tests/Matcher/TraceableUrlMatcherTest.php
index 9f0529e2de5d..1f026a6ec731 100644
--- a/src/Symfony/Component/Routing/Tests/Matcher/TraceableUrlMatcherTest.php
+++ b/src/Symfony/Component/Routing/Tests/Matcher/TraceableUrlMatcherTest.php
@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\Matcher\TraceableUrlMatcher;
+use Symfony\Component\Routing\RequestContext;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\RequestContext;
-use Symfony\Component\Routing\Matcher\TraceableUrlMatcher;
 
 class TraceableUrlMatcherTest extends TestCase
 {
diff --git a/src/Symfony/Component/Routing/Tests/Matcher/UrlMatcherTest.php b/src/Symfony/Component/Routing/Tests/Matcher/UrlMatcherTest.php
index e8d31e222529..0d4b44b09070 100644
--- a/src/Symfony/Component/Routing/Tests/Matcher/UrlMatcherTest.php
+++ b/src/Symfony/Component/Routing/Tests/Matcher/UrlMatcherTest.php
@@ -15,9 +15,9 @@
 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
 use Symfony\Component\Routing\Matcher\UrlMatcher;
+use Symfony\Component\Routing\RequestContext;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\RequestContext;
 
 class UrlMatcherTest extends TestCase
 {
diff --git a/src/Symfony/Component/Routing/Tests/RouteCollectionTest.php b/src/Symfony/Component/Routing/Tests/RouteCollectionTest.php
index 83457ff14a7b..78eb5ba5395f 100644
--- a/src/Symfony/Component/Routing/Tests/RouteCollectionTest.php
+++ b/src/Symfony/Component/Routing/Tests/RouteCollectionTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Routing\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Routing\RouteCollection;
-use Symfony\Component\Routing\Route;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
 
 class RouteCollectionTest extends TestCase
 {
diff --git a/src/Symfony/Component/Routing/Tests/RouterTest.php b/src/Symfony/Component/Routing/Tests/RouterTest.php
index 3e3d43f82cc8..e01bd9c610c2 100644
--- a/src/Symfony/Component/Routing/Tests/RouterTest.php
+++ b/src/Symfony/Component/Routing/Tests/RouterTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Routing\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Routing\Router;
-use Symfony\Component\HttpFoundation\Request;
 
 class RouterTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php b/src/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php
index 3a86aecd09aa..96dc6ad220ca 100644
--- a/src/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php
+++ b/src/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php
@@ -11,15 +11,15 @@
 
 namespace Symfony\Component\Security\Core\Authentication;
 
-use Symfony\Component\Security\Core\Event\AuthenticationFailureEvent;
-use Symfony\Component\Security\Core\Event\AuthenticationEvent;
-use Symfony\Component\Security\Core\AuthenticationEvents;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Security\Core\Authentication\Provider\AuthenticationProviderInterface;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\AuthenticationEvents;
+use Symfony\Component\Security\Core\Event\AuthenticationEvent;
+use Symfony\Component\Security\Core\Event\AuthenticationFailureEvent;
 use Symfony\Component\Security\Core\Exception\AccountStatusException;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Exception\ProviderNotFoundException;
-use Symfony\Component\Security\Core\Authentication\Provider\AuthenticationProviderInterface;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * AuthenticationProviderManager uses a list of AuthenticationProviderInterface
@@ -65,7 +65,7 @@ public function authenticate(TokenInterface $token)
 
         foreach ($this->providers as $provider) {
             if (!$provider instanceof AuthenticationProviderInterface) {
-                throw new \InvalidArgumentException(sprintf('Provider "%s" must implement the AuthenticationProviderInterface.', get_class($provider)));
+                throw new \InvalidArgumentException(sprintf('Provider "%s" must implement the AuthenticationProviderInterface.', \get_class($provider)));
             }
 
             if (!$provider->supports($token)) {
@@ -100,7 +100,7 @@ public function authenticate(TokenInterface $token)
         }
 
         if (null === $lastException) {
-            $lastException = new ProviderNotFoundException(sprintf('No Authentication Provider found for token of class "%s".', get_class($token)));
+            $lastException = new ProviderNotFoundException(sprintf('No Authentication Provider found for token of class "%s".', \get_class($token)));
         }
 
         if (null !== $this->eventDispatcher) {
diff --git a/src/Symfony/Component/Security/Core/Authentication/Provider/AnonymousAuthenticationProvider.php b/src/Symfony/Component/Security/Core/Authentication/Provider/AnonymousAuthenticationProvider.php
index 4472db1ad58c..bbb930d52595 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Provider/AnonymousAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Provider/AnonymousAuthenticationProvider.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Security\Core\Authentication\Provider;
 
+use Symfony\Component\Security\Core\Authentication\Token\AnonymousToken;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
-use Symfony\Component\Security\Core\Authentication\Token\AnonymousToken;
 
 /**
  * AnonymousAuthenticationProvider validates AnonymousToken instances.
diff --git a/src/Symfony/Component/Security/Core/Authentication/Provider/AuthenticationProviderInterface.php b/src/Symfony/Component/Security/Core/Authentication/Provider/AuthenticationProviderInterface.php
index 55514c16bf05..feb27f50d51e 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Provider/AuthenticationProviderInterface.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Provider/AuthenticationProviderInterface.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Core\Authentication\Provider;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * AuthenticationProviderInterface is the interface for all authentication
diff --git a/src/Symfony/Component/Security/Core/Authentication/Provider/DaoAuthenticationProvider.php b/src/Symfony/Component/Security/Core/Authentication/Provider/DaoAuthenticationProvider.php
index 9b3757ef5750..f8a101972368 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Provider/DaoAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Provider/DaoAuthenticationProvider.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Component\Security\Core\Authentication\Provider;
 
+use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\Encoder\EncoderFactoryInterface;
-use Symfony\Component\Security\Core\User\UserProviderInterface;
-use Symfony\Component\Security\Core\User\UserCheckerInterface;
-use Symfony\Component\Security\Core\User\UserInterface;
-use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\Exception\AuthenticationServiceException;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
-use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
+use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
+use Symfony\Component\Security\Core\User\UserCheckerInterface;
+use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Security\Core\User\UserProviderInterface;
 
 /**
  * DaoAuthenticationProvider uses a UserProviderInterface to retrieve the user
diff --git a/src/Symfony/Component/Security/Core/Authentication/Provider/LdapBindAuthenticationProvider.php b/src/Symfony/Component/Security/Core/Authentication/Provider/LdapBindAuthenticationProvider.php
index 1e5fdb9b5224..2dadc05012e1 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Provider/LdapBindAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Provider/LdapBindAuthenticationProvider.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Component\Security\Core\Authentication\Provider;
 
+use Symfony\Component\Ldap\Exception\ConnectionException;
+use Symfony\Component\Ldap\LdapInterface;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\User\UserCheckerInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
-use Symfony\Component\Ldap\LdapInterface;
-use Symfony\Component\Ldap\Exception\ConnectionException;
 
 /**
  * LdapBindAuthenticationProvider authenticates a user against an LDAP server.
diff --git a/src/Symfony/Component/Security/Core/Authentication/Provider/PreAuthenticatedAuthenticationProvider.php b/src/Symfony/Component/Security/Core/Authentication/Provider/PreAuthenticatedAuthenticationProvider.php
index 0f923d92ce99..4379ad141409 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Provider/PreAuthenticatedAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Provider/PreAuthenticatedAuthenticationProvider.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Security\Core\Authentication\Provider;
 
-use Symfony\Component\Security\Core\User\UserProviderInterface;
-use Symfony\Component\Security\Core\User\UserCheckerInterface;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
-use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Core\Authentication\Token\PreAuthenticatedToken;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Core\Exception\BadCredentialsException;
+use Symfony\Component\Security\Core\User\UserCheckerInterface;
+use Symfony\Component\Security\Core\User\UserProviderInterface;
 
 /**
  * Processes a pre-authenticated authentication request.
diff --git a/src/Symfony/Component/Security/Core/Authentication/Provider/RememberMeAuthenticationProvider.php b/src/Symfony/Component/Security/Core/Authentication/Provider/RememberMeAuthenticationProvider.php
index 145cb3a0382c..904026b6ba8f 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Provider/RememberMeAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Provider/RememberMeAuthenticationProvider.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Security\Core\Authentication\Provider;
 
-use Symfony\Component\Security\Core\User\UserCheckerInterface;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authentication\Token\RememberMeToken;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
+use Symfony\Component\Security\Core\User\UserCheckerInterface;
 
 class RememberMeAuthenticationProvider implements AuthenticationProviderInterface
 {
diff --git a/src/Symfony/Component/Security/Core/Authentication/Provider/SimpleAuthenticationProvider.php b/src/Symfony/Component/Security/Core/Authentication/Provider/SimpleAuthenticationProvider.php
index f5b1d05eda99..02e5d5d7adea 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Provider/SimpleAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Provider/SimpleAuthenticationProvider.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\Security\Core\Authentication\Provider;
 
+use Symfony\Component\Security\Core\Authentication\SimpleAuthenticatorInterface;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\User\UserChecker;
 use Symfony\Component\Security\Core\User\UserCheckerInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\Security\Core\Authentication\SimpleAuthenticatorInterface;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * @author Jordi Boggiano <j.boggiano@seld.be>
diff --git a/src/Symfony/Component/Security/Core/Authentication/Provider/UserAuthenticationProvider.php b/src/Symfony/Component/Security/Core/Authentication/Provider/UserAuthenticationProvider.php
index f57503c7691b..5f9128fe7b50 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Provider/UserAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Provider/UserAuthenticationProvider.php
@@ -11,15 +11,15 @@
 
 namespace Symfony\Component\Security\Core\Authentication\Provider;
 
-use Symfony\Component\Security\Core\User\UserInterface;
-use Symfony\Component\Security\Core\User\UserCheckerInterface;
-use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
-use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Core\Exception\AuthenticationServiceException;
-use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Exception\BadCredentialsException;
+use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\Role\SwitchUserRole;
+use Symfony\Component\Security\Core\User\UserCheckerInterface;
+use Symfony\Component\Security\Core\User\UserInterface;
 
 /**
  * UserProviderInterface retrieves users for UsernamePasswordToken tokens.
diff --git a/src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php b/src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php
index 71e8c76c2b88..61870c7839ad 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Security\Core\Authentication\Token;
 
 use Symfony\Component\Security\Core\Role\Role;
-use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\AdvancedUserInterface;
 use Symfony\Component\Security\Core\User\EquatableInterface;
+use Symfony\Component\Security\Core\User\UserInterface;
 
 /**
  * Base class for Token instances.
@@ -37,10 +37,10 @@ abstract class AbstractToken implements TokenInterface
     public function __construct(array $roles = array())
     {
         foreach ($roles as $role) {
-            if (is_string($role)) {
+            if (\is_string($role)) {
                 $role = new Role($role);
             } elseif (!$role instanceof Role) {
-                throw new \InvalidArgumentException(sprintf('$roles must be an array of strings, or Role instances, but got %s.', gettype($role)));
+                throw new \InvalidArgumentException(sprintf('$roles must be an array of strings, or Role instances, but got %s.', \gettype($role)));
             }
 
             $this->roles[] = $role;
@@ -80,7 +80,7 @@ public function getUser()
      */
     public function setUser($user)
     {
-        if (!($user instanceof UserInterface || (is_object($user) && method_exists($user, '__toString')) || is_string($user))) {
+        if (!($user instanceof UserInterface || (\is_object($user) && method_exists($user, '__toString')) || \is_string($user))) {
             throw new \InvalidArgumentException('$user must be an instanceof UserInterface, an object implementing a __toString method, or a primitive string.');
         }
 
@@ -138,7 +138,7 @@ public function serialize()
     {
         return serialize(
             array(
-                is_object($this->user) ? clone $this->user : $this->user,
+                \is_object($this->user) ? clone $this->user : $this->user,
                 $this->authenticated,
                 array_map(function ($role) { return clone $role; }, $this->roles),
                 $this->attributes,
@@ -220,7 +220,7 @@ public function setAttribute($name, $value)
      */
     public function __toString()
     {
-        $class = get_class($this);
+        $class = \get_class($this);
         $class = substr($class, strrpos($class, '\\') + 1);
 
         $roles = array();
diff --git a/src/Symfony/Component/Security/Core/Authentication/Token/UsernamePasswordToken.php b/src/Symfony/Component/Security/Core/Authentication/Token/UsernamePasswordToken.php
index 1959a1bdf98c..fb1cdf8002c0 100644
--- a/src/Symfony/Component/Security/Core/Authentication/Token/UsernamePasswordToken.php
+++ b/src/Symfony/Component/Security/Core/Authentication/Token/UsernamePasswordToken.php
@@ -43,7 +43,7 @@ public function __construct($user, $credentials, string $providerKey, array $rol
         $this->credentials = $credentials;
         $this->providerKey = $providerKey;
 
-        parent::setAuthenticated(count($roles) > 0);
+        parent::setAuthenticated(\count($roles) > 0);
     }
 
     /**
diff --git a/src/Symfony/Component/Security/Core/Authorization/AccessDecisionManager.php b/src/Symfony/Component/Security/Core/Authorization/AccessDecisionManager.php
index 3259bdd9160d..631ff8fbf158 100644
--- a/src/Symfony/Component/Security/Core/Authorization/AccessDecisionManager.php
+++ b/src/Symfony/Component/Security/Core/Authorization/AccessDecisionManager.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Core\Authorization;
 
-use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
 
 /**
  * AccessDecisionManager is the base class for all access decision managers
@@ -42,7 +42,7 @@ class AccessDecisionManager implements AccessDecisionManagerInterface
     public function __construct(iterable $voters = array(), string $strategy = self::STRATEGY_AFFIRMATIVE, bool $allowIfAllAbstainDecisions = false, bool $allowIfEqualGrantedDeniedDecisions = true)
     {
         $strategyMethod = 'decide'.ucfirst($strategy);
-        if (!is_callable(array($this, $strategyMethod))) {
+        if (!\is_callable(array($this, $strategyMethod))) {
             throw new \InvalidArgumentException(sprintf('The strategy "%s" is not supported.', $strategy));
         }
 
diff --git a/src/Symfony/Component/Security/Core/Authorization/AuthorizationChecker.php b/src/Symfony/Component/Security/Core/Authorization/AuthorizationChecker.php
index 67d5f833aff8..67c6de34b938 100644
--- a/src/Symfony/Component/Security/Core/Authorization/AuthorizationChecker.php
+++ b/src/Symfony/Component/Security/Core/Authorization/AuthorizationChecker.php
@@ -53,7 +53,7 @@ final public function isGranted($attributes, $subject = null)
             $this->tokenStorage->setToken($token = $this->authenticationManager->authenticate($token));
         }
 
-        if (!is_array($attributes)) {
+        if (!\is_array($attributes)) {
             $attributes = array($attributes);
         }
 
diff --git a/src/Symfony/Component/Security/Core/Authorization/ExpressionLanguageProvider.php b/src/Symfony/Component/Security/Core/Authorization/ExpressionLanguageProvider.php
index 9293ba7e39d4..388040d5facb 100644
--- a/src/Symfony/Component/Security/Core/Authorization/ExpressionLanguageProvider.php
+++ b/src/Symfony/Component/Security/Core/Authorization/ExpressionLanguageProvider.php
@@ -51,7 +51,7 @@ public function getFunctions()
             new ExpressionFunction('has_role', function ($role) {
                 return sprintf('in_array(%s, $roles)', $role);
             }, function (array $variables, $role) {
-                return in_array($role, $variables['roles']);
+                return \in_array($role, $variables['roles']);
             }),
         );
     }
diff --git a/src/Symfony/Component/Security/Core/Authorization/Voter/ExpressionVoter.php b/src/Symfony/Component/Security/Core/Authorization/Voter/ExpressionVoter.php
index 00633397d2d4..40f1196f0293 100644
--- a/src/Symfony/Component/Security/Core/Authorization/Voter/ExpressionVoter.php
+++ b/src/Symfony/Component/Security/Core/Authorization/Voter/ExpressionVoter.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\Security\Core\Authorization\Voter;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\ExpressionLanguage\Expression;
+use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authorization\ExpressionLanguage;
 use Symfony\Component\Security\Core\Role\RoleHierarchyInterface;
-use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
-use Symfony\Component\ExpressionLanguage\Expression;
-use Symfony\Component\HttpFoundation\Request;
 
 /**
  * ExpressionVoter votes based on the evaluation of an expression.
diff --git a/src/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php b/src/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php
index 3742b9912fa4..fc2e6883e473 100644
--- a/src/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php
+++ b/src/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php
@@ -41,7 +41,7 @@ public function vote(TokenInterface $token, $subject, array $attributes)
                 $attribute = $attribute->getRole();
             }
 
-            if (!is_string($attribute) || 0 !== strpos($attribute, $this->prefix)) {
+            if (!\is_string($attribute) || 0 !== strpos($attribute, $this->prefix)) {
                 continue;
             }
 
diff --git a/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
index 57daa66557a2..75c4db896f2d 100644
--- a/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
@@ -37,7 +37,7 @@ protected function demergePasswordAndSalt($mergedPasswordSalt)
         $salt = '';
         $saltBegins = strrpos($mergedPasswordSalt, '{');
 
-        if (false !== $saltBegins && $saltBegins + 1 < strlen($mergedPasswordSalt)) {
+        if (false !== $saltBegins && $saltBegins + 1 < \strlen($mergedPasswordSalt)) {
             $salt = substr($mergedPasswordSalt, $saltBegins + 1, -1);
             $password = substr($mergedPasswordSalt, 0, $saltBegins);
         }
@@ -93,6 +93,6 @@ protected function comparePasswords($password1, $password2)
      */
     protected function isPasswordTooLong($password)
     {
-        return strlen($password) > static::MAX_PASSWORD_LENGTH;
+        return \strlen($password) > static::MAX_PASSWORD_LENGTH;
     }
 }
diff --git a/src/Symfony/Component/Security/Core/Encoder/EncoderFactory.php b/src/Symfony/Component/Security/Core/Encoder/EncoderFactory.php
index 38caa81a05f3..2c5fd4773e95 100644
--- a/src/Symfony/Component/Security/Core/Encoder/EncoderFactory.php
+++ b/src/Symfony/Component/Security/Core/Encoder/EncoderFactory.php
@@ -40,7 +40,7 @@ public function getEncoder($user)
             $encoderKey = $encoderName;
         } else {
             foreach ($this->encoders as $class => $encoder) {
-                if ((is_object($user) && $user instanceof $class) || (!is_object($user) && (is_subclass_of($user, $class) || $user == $class))) {
+                if ((\is_object($user) && $user instanceof $class) || (!\is_object($user) && (is_subclass_of($user, $class) || $user == $class))) {
                     $encoderKey = $class;
                     break;
                 }
@@ -48,7 +48,7 @@ public function getEncoder($user)
         }
 
         if (null === $encoderKey) {
-            throw new \RuntimeException(sprintf('No encoder has been configured for account "%s".', is_object($user) ? get_class($user) : $user));
+            throw new \RuntimeException(sprintf('No encoder has been configured for account "%s".', \is_object($user) ? \get_class($user) : $user));
         }
 
         if (!$this->encoders[$encoderKey] instanceof PasswordEncoderInterface) {
diff --git a/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php
index b960580f203a..dba0c30d5a9d 100644
--- a/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php
@@ -45,7 +45,7 @@ public function encodePassword($raw, $salt)
             throw new BadCredentialsException('Invalid password.');
         }
 
-        if (!in_array($this->algorithm, hash_algos(), true)) {
+        if (!\in_array($this->algorithm, hash_algos(), true)) {
             throw new \LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
         }
 
diff --git a/src/Symfony/Component/Security/Core/Encoder/Pbkdf2PasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/Pbkdf2PasswordEncoder.php
index 186ee698bf8b..4c4eee75d807 100644
--- a/src/Symfony/Component/Security/Core/Encoder/Pbkdf2PasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/Pbkdf2PasswordEncoder.php
@@ -58,7 +58,7 @@ public function encodePassword($raw, $salt)
             throw new BadCredentialsException('Invalid password.');
         }
 
-        if (!in_array($this->algorithm, hash_algos(), true)) {
+        if (!\in_array($this->algorithm, hash_algos(), true)) {
             throw new \LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
         }
 
diff --git a/src/Symfony/Component/Security/Core/Event/AuthenticationEvent.php b/src/Symfony/Component/Security/Core/Event/AuthenticationEvent.php
index 132cea99c327..d99aea5084b4 100644
--- a/src/Symfony/Component/Security/Core/Event/AuthenticationEvent.php
+++ b/src/Symfony/Component/Security/Core/Event/AuthenticationEvent.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Core\Event;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * This is a general purpose authentication event.
diff --git a/src/Symfony/Component/Security/Core/Event/AuthenticationFailureEvent.php b/src/Symfony/Component/Security/Core/Event/AuthenticationFailureEvent.php
index 6705fc9d64d7..dd7f96892103 100644
--- a/src/Symfony/Component/Security/Core/Event/AuthenticationFailureEvent.php
+++ b/src/Symfony/Component/Security/Core/Event/AuthenticationFailureEvent.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Core\Event;
 
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * This event is dispatched on authentication failure.
diff --git a/src/Symfony/Component/Security/Core/Security.php b/src/Symfony/Component/Security/Core/Security.php
index 5f25b41ccade..5d6bf51af161 100644
--- a/src/Symfony/Component/Security/Core/Security.php
+++ b/src/Symfony/Component/Security/Core/Security.php
@@ -42,7 +42,7 @@ public function getUser()
         }
 
         $user = $token->getUser();
-        if (!is_object($user)) {
+        if (!\is_object($user)) {
             return null;
         }
 
diff --git a/src/Symfony/Component/Security/Core/Tests/Authentication/AuthenticationProviderManagerTest.php b/src/Symfony/Component/Security/Core/Tests/Authentication/AuthenticationProviderManagerTest.php
index 19828b63eca9..947bd4f694ce 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authentication/AuthenticationProviderManagerTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authentication/AuthenticationProviderManagerTest.php
@@ -13,14 +13,14 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Security\Core\Authentication\AuthenticationProviderManager;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\AuthenticationEvents;
 use Symfony\Component\Security\Core\Event\AuthenticationEvent;
 use Symfony\Component\Security\Core\Event\AuthenticationFailureEvent;
-use Symfony\Component\Security\Core\Exception\ProviderNotFoundException;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Exception\AccountStatusException;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Core\Exception\ProviderNotFoundException;
 
 class AuthenticationProviderManagerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Core/Tests/Authentication/Provider/DaoAuthenticationProviderTest.php b/src/Symfony/Component/Security/Core/Tests/Authentication/Provider/DaoAuthenticationProviderTest.php
index 85dafc1e9f8b..10e6eb78d8f8 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authentication/Provider/DaoAuthenticationProviderTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authentication/Provider/DaoAuthenticationProviderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Security\Core\Tests\Authentication\Provider;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Core\Encoder\PlaintextPasswordEncoder;
 use Symfony\Component\Security\Core\Authentication\Provider\DaoAuthenticationProvider;
+use Symfony\Component\Security\Core\Encoder\PlaintextPasswordEncoder;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 
 class DaoAuthenticationProviderTest extends TestCase
diff --git a/src/Symfony/Component/Security/Core/Tests/Authentication/Provider/LdapBindAuthenticationProviderTest.php b/src/Symfony/Component/Security/Core/Tests/Authentication/Provider/LdapBindAuthenticationProviderTest.php
index 56c54688e49e..68b4657fabf7 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authentication/Provider/LdapBindAuthenticationProviderTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authentication/Provider/LdapBindAuthenticationProviderTest.php
@@ -12,14 +12,14 @@
 namespace Symfony\Component\Security\Core\Tests\Authentication\Provider;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Ldap\LdapInterface;
-use Symfony\Component\Ldap\Entry;
-use Symfony\Component\Ldap\Adapter\QueryInterface;
 use Symfony\Component\Ldap\Adapter\CollectionInterface;
+use Symfony\Component\Ldap\Adapter\QueryInterface;
+use Symfony\Component\Ldap\Entry;
+use Symfony\Component\Ldap\Exception\ConnectionException;
+use Symfony\Component\Ldap\LdapInterface;
 use Symfony\Component\Security\Core\Authentication\Provider\LdapBindAuthenticationProvider;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\User\User;
-use Symfony\Component\Ldap\Exception\ConnectionException;
 use Symfony\Component\Security\Core\User\UserCheckerInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
 
diff --git a/src/Symfony/Component/Security/Core/Tests/Authentication/RememberMe/InMemoryTokenProviderTest.php b/src/Symfony/Component/Security/Core/Tests/Authentication/RememberMe/InMemoryTokenProviderTest.php
index 55905844681c..1413b6d402a4 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authentication/RememberMe/InMemoryTokenProviderTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authentication/RememberMe/InMemoryTokenProviderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Security\Core\Tests\Authentication\RememberMe;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentToken;
 use Symfony\Component\Security\Core\Authentication\RememberMe\InMemoryTokenProvider;
+use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentToken;
 
 class InMemoryTokenProviderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Core/Tests/Authorization/ExpressionLanguageTest.php b/src/Symfony/Component/Security/Core/Tests/Authorization/ExpressionLanguageTest.php
index 1565d1c86525..873d9d57d17f 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authorization/ExpressionLanguageTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authorization/ExpressionLanguageTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Security\Core\Tests\Authorization;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Core\Authorization\ExpressionLanguage;
 use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolver;
 use Symfony\Component\Security\Core\Authentication\Token\AnonymousToken;
 use Symfony\Component\Security\Core\Authentication\Token\RememberMeToken;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
+use Symfony\Component\Security\Core\Authorization\ExpressionLanguage;
 use Symfony\Component\Security\Core\User\User;
 
 class ExpressionLanguageTest extends TestCase
diff --git a/src/Symfony/Component/Security/Core/Tests/Authorization/TraceableAccessDecisionManagerTest.php b/src/Symfony/Component/Security/Core/Tests/Authorization/TraceableAccessDecisionManagerTest.php
index b424b4bef9b9..100a4dd4d1d1 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authorization/TraceableAccessDecisionManagerTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authorization/TraceableAccessDecisionManagerTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Security\Core\Tests\Authorization;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authorization\AccessDecisionManager;
 use Symfony\Component\Security\Core\Authorization\DebugAccessDecisionManager;
 use Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 class TraceableAccessDecisionManagerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/VoterTest.php b/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/VoterTest.php
index 70e3226ece44..f0e10cde1a28 100644
--- a/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/VoterTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Authorization/Voter/VoterTest.php
@@ -66,6 +66,6 @@ protected function voteOnAttribute($attribute, $object, TokenInterface $token)
 
     protected function supports($attribute, $object)
     {
-        return $object instanceof \stdClass && in_array($attribute, array('EDIT', 'CREATE'));
+        return $object instanceof \stdClass && \in_array($attribute, array('EDIT', 'CREATE'));
     }
 }
diff --git a/src/Symfony/Component/Security/Core/Tests/Encoder/BCryptPasswordEncoderTest.php b/src/Symfony/Component/Security/Core/Tests/Encoder/BCryptPasswordEncoderTest.php
index 0977d7350736..55590ffc3d0a 100644
--- a/src/Symfony/Component/Security/Core/Tests/Encoder/BCryptPasswordEncoderTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Encoder/BCryptPasswordEncoderTest.php
@@ -58,7 +58,7 @@ public function testResultLength()
     {
         $encoder = new BCryptPasswordEncoder(self::VALID_COST);
         $result = $encoder->encodePassword(self::PASSWORD, null);
-        $this->assertEquals(60, strlen($result));
+        $this->assertEquals(60, \strlen($result));
     }
 
     public function testValidation()
diff --git a/src/Symfony/Component/Security/Core/Tests/Encoder/EncoderFactoryTest.php b/src/Symfony/Component/Security/Core/Tests/Encoder/EncoderFactoryTest.php
index 926b1cc58eda..9a56b838aae3 100644
--- a/src/Symfony/Component/Security/Core/Tests/Encoder/EncoderFactoryTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Encoder/EncoderFactoryTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Security\Core\Tests\Encoder;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Core\Encoder\MessageDigestPasswordEncoder;
-use Symfony\Component\Security\Core\Encoder\EncoderFactory;
 use Symfony\Component\Security\Core\Encoder\EncoderAwareInterface;
+use Symfony\Component\Security\Core\Encoder\EncoderFactory;
+use Symfony\Component\Security\Core\Encoder\MessageDigestPasswordEncoder;
 use Symfony\Component\Security\Core\User\User;
 use Symfony\Component\Security\Core\User\UserInterface;
 
diff --git a/src/Symfony/Component/Security/Core/Tests/Resources/TranslationFilesTest.php b/src/Symfony/Component/Security/Core/Tests/Resources/TranslationFilesTest.php
index 07c5e304b4ad..f4e0d9e6e8f9 100644
--- a/src/Symfony/Component/Security/Core/Tests/Resources/TranslationFilesTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Resources/TranslationFilesTest.php
@@ -33,15 +33,15 @@ public function provideTranslationFiles()
     {
         return array_map(
             function ($filePath) { return (array) $filePath; },
-            glob(dirname(dirname(__DIR__)).'/Resources/translations/*.xlf')
+            glob(\dirname(\dirname(__DIR__)).'/Resources/translations/*.xlf')
         );
     }
 
     public function testNorwegianAlias()
     {
         $this->assertFileEquals(
-            dirname(dirname(__DIR__)).'/Resources/translations/security.nb.xlf',
-            dirname(dirname(__DIR__)).'/Resources/translations/security.no.xlf',
+            \dirname(\dirname(__DIR__)).'/Resources/translations/security.nb.xlf',
+            \dirname(\dirname(__DIR__)).'/Resources/translations/security.no.xlf',
             'The NO locale should be an alias for the NB variant of the Norwegian language.'
         );
     }
diff --git a/src/Symfony/Component/Security/Core/Tests/Role/RoleHierarchyTest.php b/src/Symfony/Component/Security/Core/Tests/Role/RoleHierarchyTest.php
index 4d190cfc9482..9e6b9d3a2b26 100644
--- a/src/Symfony/Component/Security/Core/Tests/Role/RoleHierarchyTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/Role/RoleHierarchyTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Security\Core\Tests\Role;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Core\Role\RoleHierarchy;
 use Symfony\Component\Security\Core\Role\Role;
+use Symfony\Component\Security\Core\Role\RoleHierarchy;
 
 class RoleHierarchyTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Core/Tests/User/ChainUserProviderTest.php b/src/Symfony/Component/Security/Core/Tests/User/ChainUserProviderTest.php
index 7f4d38f190bd..375927356422 100644
--- a/src/Symfony/Component/Security/Core/Tests/User/ChainUserProviderTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/User/ChainUserProviderTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
-use Symfony\Component\Security\Core\User\ChainUserProvider;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
+use Symfony\Component\Security\Core\User\ChainUserProvider;
 
 class ChainUserProviderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Core/Tests/User/LdapUserProviderTest.php b/src/Symfony/Component/Security/Core/Tests/User/LdapUserProviderTest.php
index b728df1ae153..7d1da7c408e3 100644
--- a/src/Symfony/Component/Security/Core/Tests/User/LdapUserProviderTest.php
+++ b/src/Symfony/Component/Security/Core/Tests/User/LdapUserProviderTest.php
@@ -15,9 +15,9 @@
 use Symfony\Component\Ldap\Adapter\CollectionInterface;
 use Symfony\Component\Ldap\Adapter\QueryInterface;
 use Symfony\Component\Ldap\Entry;
+use Symfony\Component\Ldap\Exception\ConnectionException;
 use Symfony\Component\Ldap\LdapInterface;
 use Symfony\Component\Security\Core\User\LdapUserProvider;
-use Symfony\Component\Ldap\Exception\ConnectionException;
 
 /**
  * @requires extension ldap
diff --git a/src/Symfony/Component/Security/Core/User/AdvancedUserInterface.php b/src/Symfony/Component/Security/Core/User/AdvancedUserInterface.php
index 087c3c6e2695..dd078465bb10 100644
--- a/src/Symfony/Component/Security/Core/User/AdvancedUserInterface.php
+++ b/src/Symfony/Component/Security/Core/User/AdvancedUserInterface.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Security\Core\User;
 
-use Symfony\Component\Security\Core\Exception\AccountStatusException;
 use Symfony\Component\Security\Core\Exception\AccountExpiredException;
-use Symfony\Component\Security\Core\Exception\LockedException;
+use Symfony\Component\Security\Core\Exception\AccountStatusException;
 use Symfony\Component\Security\Core\Exception\CredentialsExpiredException;
 use Symfony\Component\Security\Core\Exception\DisabledException;
+use Symfony\Component\Security\Core\Exception\LockedException;
 
 /**
  * Adds extra features to a user class related to account status flags.
diff --git a/src/Symfony/Component/Security/Core/User/ChainUserProvider.php b/src/Symfony/Component/Security/Core/User/ChainUserProvider.php
index 1faa723990f5..4106ad190afe 100644
--- a/src/Symfony/Component/Security/Core/User/ChainUserProvider.php
+++ b/src/Symfony/Component/Security/Core/User/ChainUserProvider.php
@@ -87,7 +87,7 @@ public function refreshUser(UserInterface $user)
             $e->setUsername($user->getUsername());
             throw $e;
         } else {
-            throw new UnsupportedUserException(sprintf('The account "%s" is not supported.', get_class($user)));
+            throw new UnsupportedUserException(sprintf('The account "%s" is not supported.', \get_class($user)));
         }
     }
 
diff --git a/src/Symfony/Component/Security/Core/User/InMemoryUserProvider.php b/src/Symfony/Component/Security/Core/User/InMemoryUserProvider.php
index 0af14e6a4699..199d95f90c8d 100644
--- a/src/Symfony/Component/Security/Core/User/InMemoryUserProvider.php
+++ b/src/Symfony/Component/Security/Core/User/InMemoryUserProvider.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Core\User;
 
-use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
+use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 
 /**
  * InMemoryUserProvider is a simple non persistent user provider.
@@ -74,7 +74,7 @@ public function loadUserByUsername($username)
     public function refreshUser(UserInterface $user)
     {
         if (!$user instanceof User) {
-            throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', get_class($user)));
+            throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', \get_class($user)));
         }
 
         $storedUser = $this->getUser($user->getUsername());
diff --git a/src/Symfony/Component/Security/Core/User/LdapUserProvider.php b/src/Symfony/Component/Security/Core/User/LdapUserProvider.php
index 5f47fe8923b9..91b32ec9c88d 100644
--- a/src/Symfony/Component/Security/Core/User/LdapUserProvider.php
+++ b/src/Symfony/Component/Security/Core/User/LdapUserProvider.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Security\Core\User;
 
 use Symfony\Component\Ldap\Entry;
+use Symfony\Component\Ldap\Exception\ConnectionException;
+use Symfony\Component\Ldap\LdapInterface;
 use Symfony\Component\Security\Core\Exception\InvalidArgumentException;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
-use Symfony\Component\Ldap\Exception\ConnectionException;
-use Symfony\Component\Ldap\LdapInterface;
 
 /**
  * LdapUserProvider is a simple user provider on top of ldap.
@@ -66,7 +66,7 @@ public function loadUserByUsername($username)
         }
 
         $entries = $search->execute();
-        $count = count($entries);
+        $count = \count($entries);
 
         if (!$count) {
             throw new UsernameNotFoundException(sprintf('User "%s" not found.', $username));
@@ -94,7 +94,7 @@ public function loadUserByUsername($username)
     public function refreshUser(UserInterface $user)
     {
         if (!$user instanceof User) {
-            throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', get_class($user)));
+            throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', \get_class($user)));
         }
 
         return new User($user->getUsername(), null, $user->getRoles());
@@ -141,7 +141,7 @@ private function getAttributeValue(Entry $entry, $attribute)
 
         $values = $entry->getAttribute($attribute);
 
-        if (1 !== count($values)) {
+        if (1 !== \count($values)) {
             throw new InvalidArgumentException(sprintf('Attribute "%s" has multiple values.', $attribute));
         }
 
diff --git a/src/Symfony/Component/Security/Core/User/UserChecker.php b/src/Symfony/Component/Security/Core/User/UserChecker.php
index ac577a37ba0c..f7f794c0d811 100644
--- a/src/Symfony/Component/Security/Core/User/UserChecker.php
+++ b/src/Symfony/Component/Security/Core/User/UserChecker.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Security\Core\User;
 
+use Symfony\Component\Security\Core\Exception\AccountExpiredException;
 use Symfony\Component\Security\Core\Exception\CredentialsExpiredException;
-use Symfony\Component\Security\Core\Exception\LockedException;
 use Symfony\Component\Security\Core\Exception\DisabledException;
-use Symfony\Component\Security\Core\Exception\AccountExpiredException;
+use Symfony\Component\Security\Core\Exception\LockedException;
 
 /**
  * UserChecker checks the user account flags.
diff --git a/src/Symfony/Component/Security/Core/User/UserProviderInterface.php b/src/Symfony/Component/Security/Core/User/UserProviderInterface.php
index 5867e83333c5..b6a841fb96c2 100644
--- a/src/Symfony/Component/Security/Core/User/UserProviderInterface.php
+++ b/src/Symfony/Component/Security/Core/User/UserProviderInterface.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Core\User;
 
-use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
+use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 
 /**
  * Represents a class that loads UserInterface objects from some source for the authentication system.
diff --git a/src/Symfony/Component/Security/Core/Validator/Constraints/UserPasswordValidator.php b/src/Symfony/Component/Security/Core/Validator/Constraints/UserPasswordValidator.php
index c2ab13b2f6d2..41559a3adcd1 100644
--- a/src/Symfony/Component/Security/Core/Validator/Constraints/UserPasswordValidator.php
+++ b/src/Symfony/Component/Security/Core/Validator/Constraints/UserPasswordValidator.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Core\Validator\Constraints;
 
-use Symfony\Component\Security\Core\User\UserInterface;
-use Symfony\Component\Security\Core\Encoder\EncoderFactoryInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
+use Symfony\Component\Security\Core\Encoder\EncoderFactoryInterface;
+use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
 use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
diff --git a/src/Symfony/Component/Security/Csrf/CsrfTokenManager.php b/src/Symfony/Component/Security/Csrf/CsrfTokenManager.php
index 332880fda518..861f228e155c 100644
--- a/src/Symfony/Component/Security/Csrf/CsrfTokenManager.php
+++ b/src/Symfony/Component/Security/Csrf/CsrfTokenManager.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\Security\Core\Exception\InvalidArgumentException;
-use Symfony\Component\Security\Csrf\TokenGenerator\UriSafeTokenGenerator;
 use Symfony\Component\Security\Csrf\TokenGenerator\TokenGeneratorInterface;
+use Symfony\Component\Security\Csrf\TokenGenerator\UriSafeTokenGenerator;
 use Symfony\Component\Security\Csrf\TokenStorage\NativeSessionTokenStorage;
 use Symfony\Component\Security\Csrf\TokenStorage\TokenStorageInterface;
 
@@ -56,10 +56,10 @@ public function __construct(TokenGeneratorInterface $generator = null, TokenStor
 
                 return $superGlobalNamespaceGenerator();
             };
-        } elseif (is_callable($namespace) || is_string($namespace)) {
+        } elseif (\is_callable($namespace) || \is_string($namespace)) {
             $this->namespace = $namespace;
         } else {
-            throw new InvalidArgumentException(sprintf('$namespace must be a string, a callable returning a string, null or an instance of "RequestStack". "%s" given.', gettype($namespace)));
+            throw new InvalidArgumentException(sprintf('$namespace must be a string, a callable returning a string, null or an instance of "RequestStack". "%s" given.', \gettype($namespace)));
         }
     }
 
@@ -116,6 +116,6 @@ public function isTokenValid(CsrfToken $token)
 
     private function getNamespace()
     {
-        return is_callable($ns = $this->namespace) ? $ns() : $ns;
+        return \is_callable($ns = $this->namespace) ? $ns() : $ns;
     }
 }
diff --git a/src/Symfony/Component/Security/Guard/Authenticator/AbstractFormLoginAuthenticator.php b/src/Symfony/Component/Security/Guard/Authenticator/AbstractFormLoginAuthenticator.php
index df89871bef15..c260c7aaabc0 100644
--- a/src/Symfony/Component/Security/Guard/Authenticator/AbstractFormLoginAuthenticator.php
+++ b/src/Symfony/Component/Security/Guard/Authenticator/AbstractFormLoginAuthenticator.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Security\Guard\Authenticator;
 
-use Symfony\Component\HttpFoundation\Session\SessionInterface;
-use Symfony\Component\Security\Guard\AbstractGuardAuthenticator;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Session\SessionInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Security\Guard\AbstractGuardAuthenticator;
 use Symfony\Component\Security\Http\Util\TargetPathTrait;
 
 /**
diff --git a/src/Symfony/Component/Security/Guard/Firewall/GuardAuthenticationListener.php b/src/Symfony/Component/Security/Guard/Firewall/GuardAuthenticationListener.php
index 67861de34bb8..2fbcef30d669 100644
--- a/src/Symfony/Component/Security/Guard/Firewall/GuardAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Guard/Firewall/GuardAuthenticationListener.php
@@ -11,16 +11,16 @@
 
 namespace Symfony\Component\Security\Guard\Firewall;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\Security\Guard\GuardAuthenticatorHandler;
-use Symfony\Component\Security\Guard\AuthenticatorInterface;
-use Symfony\Component\Security\Guard\Token\PreAuthenticationGuardToken;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
-use Psr\Log\LoggerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Guard\AuthenticatorInterface;
+use Symfony\Component\Security\Guard\GuardAuthenticatorHandler;
+use Symfony\Component\Security\Guard\Token\PreAuthenticationGuardToken;
 use Symfony\Component\Security\Http\Firewall\ListenerInterface;
 use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 
@@ -67,8 +67,8 @@ public function handle(GetResponseEvent $event)
         if (null !== $this->logger) {
             $context = array('firewall_key' => $this->providerKey);
 
-            if ($this->guardAuthenticators instanceof \Countable || is_array($this->guardAuthenticators)) {
-                $context['authenticators'] = count($this->guardAuthenticators);
+            if ($this->guardAuthenticators instanceof \Countable || \is_array($this->guardAuthenticators)) {
+                $context['authenticators'] = \count($this->guardAuthenticators);
             }
 
             $this->logger->debug('Checking for guard authentication credentials.', $context);
@@ -83,7 +83,7 @@ public function handle(GetResponseEvent $event)
 
             if ($event->hasResponse()) {
                 if (null !== $this->logger) {
-                    $this->logger->debug('The "{authenticator}" authenticator set the response. Any later authenticator will not be called', array('authenticator' => get_class($guardAuthenticator)));
+                    $this->logger->debug('The "{authenticator}" authenticator set the response. Any later authenticator will not be called', array('authenticator' => \get_class($guardAuthenticator)));
                 }
 
                 break;
@@ -96,7 +96,7 @@ private function executeGuardAuthenticator($uniqueGuardKey, AuthenticatorInterfa
         $request = $event->getRequest();
         try {
             if (null !== $this->logger) {
-                $this->logger->debug('Calling getCredentials() on guard configurator.', array('firewall_key' => $this->providerKey, 'authenticator' => get_class($guardAuthenticator)));
+                $this->logger->debug('Calling getCredentials() on guard configurator.', array('firewall_key' => $this->providerKey, 'authenticator' => \get_class($guardAuthenticator)));
             }
 
             // abort the execution of the authenticator if it doesn't support the request
@@ -108,21 +108,21 @@ private function executeGuardAuthenticator($uniqueGuardKey, AuthenticatorInterfa
             $credentials = $guardAuthenticator->getCredentials($request);
 
             if (null === $credentials) {
-                throw new \UnexpectedValueException(sprintf('The return value of "%1$s::getCredentials()" must not be null. Return false from "%1$s::supports()" instead.', get_class($guardAuthenticator)));
+                throw new \UnexpectedValueException(sprintf('The return value of "%1$s::getCredentials()" must not be null. Return false from "%1$s::supports()" instead.', \get_class($guardAuthenticator)));
             }
 
             // create a token with the unique key, so that the provider knows which authenticator to use
             $token = new PreAuthenticationGuardToken($credentials, $uniqueGuardKey);
 
             if (null !== $this->logger) {
-                $this->logger->debug('Passing guard token information to the GuardAuthenticationProvider', array('firewall_key' => $this->providerKey, 'authenticator' => get_class($guardAuthenticator)));
+                $this->logger->debug('Passing guard token information to the GuardAuthenticationProvider', array('firewall_key' => $this->providerKey, 'authenticator' => \get_class($guardAuthenticator)));
             }
             // pass the token into the AuthenticationManager system
             // this indirectly calls GuardAuthenticationProvider::authenticate()
             $token = $this->authenticationManager->authenticate($token);
 
             if (null !== $this->logger) {
-                $this->logger->info('Guard authentication successful!', array('token' => $token, 'authenticator' => get_class($guardAuthenticator)));
+                $this->logger->info('Guard authentication successful!', array('token' => $token, 'authenticator' => \get_class($guardAuthenticator)));
             }
 
             // sets the token on the token storage, etc
@@ -131,7 +131,7 @@ private function executeGuardAuthenticator($uniqueGuardKey, AuthenticatorInterfa
             // oh no! Authentication failed!
 
             if (null !== $this->logger) {
-                $this->logger->info('Guard authentication failed.', array('exception' => $e, 'authenticator' => get_class($guardAuthenticator)));
+                $this->logger->info('Guard authentication failed.', array('exception' => $e, 'authenticator' => \get_class($guardAuthenticator)));
             }
 
             $response = $this->guardHandler->handleAuthenticationFailure($e, $request, $guardAuthenticator, $this->providerKey);
@@ -147,13 +147,13 @@ private function executeGuardAuthenticator($uniqueGuardKey, AuthenticatorInterfa
         $response = $this->guardHandler->handleAuthenticationSuccess($token, $request, $guardAuthenticator, $this->providerKey);
         if ($response instanceof Response) {
             if (null !== $this->logger) {
-                $this->logger->debug('Guard authenticator set success response.', array('response' => $response, 'authenticator' => get_class($guardAuthenticator)));
+                $this->logger->debug('Guard authenticator set success response.', array('response' => $response, 'authenticator' => \get_class($guardAuthenticator)));
             }
 
             $event->setResponse($response);
         } else {
             if (null !== $this->logger) {
-                $this->logger->debug('Guard authenticator set no success response: request continues.', array('authenticator' => get_class($guardAuthenticator)));
+                $this->logger->debug('Guard authenticator set no success response: request continues.', array('authenticator' => \get_class($guardAuthenticator)));
             }
         }
 
@@ -177,7 +177,7 @@ private function triggerRememberMe(AuthenticatorInterface $guardAuthenticator, R
     {
         if (null === $this->rememberMeServices) {
             if (null !== $this->logger) {
-                $this->logger->debug('Remember me skipped: it is not configured for the firewall.', array('authenticator' => get_class($guardAuthenticator)));
+                $this->logger->debug('Remember me skipped: it is not configured for the firewall.', array('authenticator' => \get_class($guardAuthenticator)));
             }
 
             return;
@@ -185,7 +185,7 @@ private function triggerRememberMe(AuthenticatorInterface $guardAuthenticator, R
 
         if (!$guardAuthenticator->supportsRememberMe()) {
             if (null !== $this->logger) {
-                $this->logger->debug('Remember me skipped: your authenticator does not support it.', array('authenticator' => get_class($guardAuthenticator)));
+                $this->logger->debug('Remember me skipped: your authenticator does not support it.', array('authenticator' => \get_class($guardAuthenticator)));
             }
 
             return;
@@ -194,7 +194,7 @@ private function triggerRememberMe(AuthenticatorInterface $guardAuthenticator, R
         if (!$response instanceof Response) {
             throw new \LogicException(sprintf(
                 '%s::onAuthenticationSuccess *must* return a Response if you want to use the remember me functionality. Return a Response, or set remember_me to false under the guard configuration.',
-                get_class($guardAuthenticator)
+                \get_class($guardAuthenticator)
             ));
         }
 
diff --git a/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php b/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php
index 80844192077d..aedbb655974e 100644
--- a/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php
+++ b/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php
@@ -81,8 +81,8 @@ public function handleAuthenticationSuccess(TokenInterface $token, Request $requ
 
         throw new \UnexpectedValueException(sprintf(
             'The %s::onAuthenticationSuccess method must return null or a Response object. You returned %s.',
-            get_class($guardAuthenticator),
-            is_object($response) ? get_class($response) : gettype($response)
+            \get_class($guardAuthenticator),
+            \is_object($response) ? \get_class($response) : \gettype($response)
         ));
     }
 
@@ -115,8 +115,8 @@ public function handleAuthenticationFailure(AuthenticationException $authenticat
 
         throw new \UnexpectedValueException(sprintf(
             'The %s::onAuthenticationFailure method must return null or a Response object. You returned %s.',
-            get_class($guardAuthenticator),
-            is_object($response) ? get_class($response) : gettype($response)
+            \get_class($guardAuthenticator),
+            \is_object($response) ? \get_class($response) : \gettype($response)
         ));
     }
 
diff --git a/src/Symfony/Component/Security/Guard/Provider/GuardAuthenticationProvider.php b/src/Symfony/Component/Security/Guard/Provider/GuardAuthenticationProvider.php
index 62af83f23dab..7e68574a3780 100644
--- a/src/Symfony/Component/Security/Guard/Provider/GuardAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Guard/Provider/GuardAuthenticationProvider.php
@@ -12,17 +12,17 @@
 namespace Symfony\Component\Security\Guard\Provider;
 
 use Symfony\Component\Security\Core\Authentication\Provider\AuthenticationProviderInterface;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Core\Exception\AuthenticationExpiredException;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
-use Symfony\Component\Security\Guard\AuthenticatorInterface;
-use Symfony\Component\Security\Guard\Token\GuardTokenInterface;
-use Symfony\Component\Security\Guard\Token\PreAuthenticationGuardToken;
 use Symfony\Component\Security\Core\User\UserCheckerInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\Security\Core\Exception\AuthenticationExpiredException;
+use Symfony\Component\Security\Guard\AuthenticatorInterface;
+use Symfony\Component\Security\Guard\Token\GuardTokenInterface;
+use Symfony\Component\Security\Guard\Token\PreAuthenticationGuardToken;
 
 /**
  * Responsible for accepting the PreAuthenticationGuardToken and calling
@@ -102,23 +102,23 @@ private function authenticateViaGuard($guardAuthenticator, PreAuthenticationGuar
         $user = $guardAuthenticator->getUser($token->getCredentials(), $this->userProvider);
 
         if (null === $user) {
-            throw new UsernameNotFoundException(sprintf('Null returned from %s::getUser()', get_class($guardAuthenticator)));
+            throw new UsernameNotFoundException(sprintf('Null returned from %s::getUser()', \get_class($guardAuthenticator)));
         }
 
         if (!$user instanceof UserInterface) {
-            throw new \UnexpectedValueException(sprintf('The %s::getUser() method must return a UserInterface. You returned %s.', get_class($guardAuthenticator), is_object($user) ? get_class($user) : gettype($user)));
+            throw new \UnexpectedValueException(sprintf('The %s::getUser() method must return a UserInterface. You returned %s.', \get_class($guardAuthenticator), \is_object($user) ? \get_class($user) : \gettype($user)));
         }
 
         $this->userChecker->checkPreAuth($user);
         if (true !== $guardAuthenticator->checkCredentials($token->getCredentials(), $user)) {
-            throw new BadCredentialsException(sprintf('Authentication failed because %s::checkCredentials() did not return true.', get_class($guardAuthenticator)));
+            throw new BadCredentialsException(sprintf('Authentication failed because %s::checkCredentials() did not return true.', \get_class($guardAuthenticator)));
         }
         $this->userChecker->checkPostAuth($user);
 
         // turn the UserInterface into a TokenInterface
         $authenticatedToken = $guardAuthenticator->createAuthenticatedToken($user, $this->providerKey);
         if (!$authenticatedToken instanceof TokenInterface) {
-            throw new \UnexpectedValueException(sprintf('The %s::createAuthenticatedToken() method must return a TokenInterface. You returned %s.', get_class($guardAuthenticator), is_object($authenticatedToken) ? get_class($authenticatedToken) : gettype($authenticatedToken)));
+            throw new \UnexpectedValueException(sprintf('The %s::createAuthenticatedToken() method must return a TokenInterface. You returned %s.', \get_class($guardAuthenticator), \is_object($authenticatedToken) ? \get_class($authenticatedToken) : \gettype($authenticatedToken)));
         }
 
         return $authenticatedToken;
diff --git a/src/Symfony/Component/Security/Guard/Tests/Firewall/GuardAuthenticationListenerTest.php b/src/Symfony/Component/Security/Guard/Tests/Firewall/GuardAuthenticationListenerTest.php
index e4a47fd8f0eb..4bba85d74ede 100644
--- a/src/Symfony/Component/Security/Guard/Tests/Firewall/GuardAuthenticationListenerTest.php
+++ b/src/Symfony/Component/Security/Guard/Tests/Firewall/GuardAuthenticationListenerTest.php
@@ -15,10 +15,10 @@
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Guard\AuthenticatorInterface;
 use Symfony\Component\Security\Guard\Firewall\GuardAuthenticationListener;
 use Symfony\Component\Security\Guard\Token\PreAuthenticationGuardToken;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * @author Ryan Weaver <weaverryan@gmail.com>
diff --git a/src/Symfony/Component/Security/Guard/Tests/GuardAuthenticatorHandlerTest.php b/src/Symfony/Component/Security/Guard/Tests/GuardAuthenticatorHandlerTest.php
index 06ed4bed3af4..6f0bb6248aca 100644
--- a/src/Symfony/Component/Security/Guard/Tests/GuardAuthenticatorHandlerTest.php
+++ b/src/Symfony/Component/Security/Guard/Tests/GuardAuthenticatorHandlerTest.php
@@ -14,9 +14,9 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Guard\AuthenticatorInterface;
 use Symfony\Component\Security\Guard\GuardAuthenticatorHandler;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
 
diff --git a/src/Symfony/Component/Security/Http/AccessMap.php b/src/Symfony/Component/Security/Http/AccessMap.php
index acd4101e72a9..2f3757336eda 100644
--- a/src/Symfony/Component/Security/Http/AccessMap.php
+++ b/src/Symfony/Component/Security/Http/AccessMap.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Http;
 
-use Symfony\Component\HttpFoundation\RequestMatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestMatcherInterface;
 
 /**
  * AccessMap allows configuration of different access control rules for
diff --git a/src/Symfony/Component/Security/Http/Authentication/AuthenticationFailureHandlerInterface.php b/src/Symfony/Component/Security/Http/Authentication/AuthenticationFailureHandlerInterface.php
index de7a1ca5eb32..15e4c9ccec26 100644
--- a/src/Symfony/Component/Security/Http/Authentication/AuthenticationFailureHandlerInterface.php
+++ b/src/Symfony/Component/Security/Http/Authentication/AuthenticationFailureHandlerInterface.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\Authentication;
 
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * Interface for custom authentication failure handlers.
diff --git a/src/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php b/src/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php
index 9ef863b1349a..ce8c27ba7db3 100644
--- a/src/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php
+++ b/src/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\Authentication;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * Interface for a custom authentication success handler.
diff --git a/src/Symfony/Component/Security/Http/Authentication/CustomAuthenticationSuccessHandler.php b/src/Symfony/Component/Security/Http/Authentication/CustomAuthenticationSuccessHandler.php
index 64c6d32a91cd..357906a8ceb4 100644
--- a/src/Symfony/Component/Security/Http/Authentication/CustomAuthenticationSuccessHandler.php
+++ b/src/Symfony/Component/Security/Http/Authentication/CustomAuthenticationSuccessHandler.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Http\Authentication;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
diff --git a/src/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationFailureHandler.php b/src/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationFailureHandler.php
index e8126fcf5239..ad1e4cb1940e 100644
--- a/src/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationFailureHandler.php
+++ b/src/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationFailureHandler.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\Authentication;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Psr\Log\LoggerInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Security;
 use Symfony\Component\Security\Http\HttpUtils;
diff --git a/src/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationSuccessHandler.php b/src/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationSuccessHandler.php
index babf86b84b7e..38d16a6f7584 100644
--- a/src/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationSuccessHandler.php
+++ b/src/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationSuccessHandler.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Security\Http\Authentication;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Security\Http\Util\TargetPathTrait;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Http\HttpUtils;
 use Symfony\Component\Security\Http\ParameterBagUtils;
+use Symfony\Component\Security\Http\Util\TargetPathTrait;
 
 /**
  * Class with the default authentication success handling logic.
diff --git a/src/Symfony/Component/Security/Http/Authentication/SimpleAuthenticationHandler.php b/src/Symfony/Component/Security/Http/Authentication/SimpleAuthenticationHandler.php
index 669dc13489fe..484e60fe6e13 100644
--- a/src/Symfony/Component/Security/Http/Authentication/SimpleAuthenticationHandler.php
+++ b/src/Symfony/Component/Security/Http/Authentication/SimpleAuthenticationHandler.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Security\Http\Authentication;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Psr\Log\LoggerInterface;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authentication\SimpleAuthenticatorInterface;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * Class to proxy authentication success/failure handlers.
@@ -55,7 +55,7 @@ public function onAuthenticationSuccess(Request $request, TokenInterface $token)
     {
         if ($this->simpleAuthenticator instanceof AuthenticationSuccessHandlerInterface) {
             if ($this->logger) {
-                $this->logger->debug('Selected an authentication success handler.', array('handler' => get_class($this->simpleAuthenticator)));
+                $this->logger->debug('Selected an authentication success handler.', array('handler' => \get_class($this->simpleAuthenticator)));
             }
 
             $response = $this->simpleAuthenticator->onAuthenticationSuccess($request, $token);
@@ -64,7 +64,7 @@ public function onAuthenticationSuccess(Request $request, TokenInterface $token)
             }
 
             if (null !== $response) {
-                throw new \UnexpectedValueException(sprintf('The %s::onAuthenticationSuccess method must return null to use the default success handler, or a Response object', get_class($this->simpleAuthenticator)));
+                throw new \UnexpectedValueException(sprintf('The %s::onAuthenticationSuccess method must return null to use the default success handler, or a Response object', \get_class($this->simpleAuthenticator)));
             }
         }
 
@@ -82,7 +82,7 @@ public function onAuthenticationFailure(Request $request, AuthenticationExceptio
     {
         if ($this->simpleAuthenticator instanceof AuthenticationFailureHandlerInterface) {
             if ($this->logger) {
-                $this->logger->debug('Selected an authentication failure handler.', array('handler' => get_class($this->simpleAuthenticator)));
+                $this->logger->debug('Selected an authentication failure handler.', array('handler' => \get_class($this->simpleAuthenticator)));
             }
 
             $response = $this->simpleAuthenticator->onAuthenticationFailure($request, $exception);
@@ -91,7 +91,7 @@ public function onAuthenticationFailure(Request $request, AuthenticationExceptio
             }
 
             if (null !== $response) {
-                throw new \UnexpectedValueException(sprintf('The %s::onAuthenticationFailure method must return null to use the default failure handler, or a Response object', get_class($this->simpleAuthenticator)));
+                throw new \UnexpectedValueException(sprintf('The %s::onAuthenticationFailure method must return null to use the default failure handler, or a Response object', \get_class($this->simpleAuthenticator)));
             }
         }
 
diff --git a/src/Symfony/Component/Security/Http/EntryPoint/AuthenticationEntryPointInterface.php b/src/Symfony/Component/Security/Http/EntryPoint/AuthenticationEntryPointInterface.php
index 9bade0cb699d..f9484e0a6c7d 100644
--- a/src/Symfony/Component/Security/Http/EntryPoint/AuthenticationEntryPointInterface.php
+++ b/src/Symfony/Component/Security/Http/EntryPoint/AuthenticationEntryPointInterface.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\EntryPoint;
 
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * Implement this interface for any classes that will be called to "start"
diff --git a/src/Symfony/Component/Security/Http/EntryPoint/BasicAuthenticationEntryPoint.php b/src/Symfony/Component/Security/Http/EntryPoint/BasicAuthenticationEntryPoint.php
index 4e60428df749..b75d0ebd3274 100644
--- a/src/Symfony/Component/Security/Http/EntryPoint/BasicAuthenticationEntryPoint.php
+++ b/src/Symfony/Component/Security/Http/EntryPoint/BasicAuthenticationEntryPoint.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\EntryPoint;
 
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * BasicAuthenticationEntryPoint starts an HTTP Basic authentication.
diff --git a/src/Symfony/Component/Security/Http/EntryPoint/FormAuthenticationEntryPoint.php b/src/Symfony/Component/Security/Http/EntryPoint/FormAuthenticationEntryPoint.php
index 3ebdeffec899..04e7033d853a 100644
--- a/src/Symfony/Component/Security/Http/EntryPoint/FormAuthenticationEntryPoint.php
+++ b/src/Symfony/Component/Security/Http/EntryPoint/FormAuthenticationEntryPoint.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Security\Http\EntryPoint;
 
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Http\HttpUtils;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
  * FormAuthenticationEntryPoint starts an authentication via a login form.
diff --git a/src/Symfony/Component/Security/Http/EntryPoint/RetryAuthenticationEntryPoint.php b/src/Symfony/Component/Security/Http/EntryPoint/RetryAuthenticationEntryPoint.php
index bad771872ec5..ca7f9121ee1b 100644
--- a/src/Symfony/Component/Security/Http/EntryPoint/RetryAuthenticationEntryPoint.php
+++ b/src/Symfony/Component/Security/Http/EntryPoint/RetryAuthenticationEntryPoint.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\EntryPoint;
 
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * RetryAuthenticationEntryPoint redirects URL based on the configured scheme.
diff --git a/src/Symfony/Component/Security/Http/Event/InteractiveLoginEvent.php b/src/Symfony/Component/Security/Http/Event/InteractiveLoginEvent.php
index d46b1d522ebf..767d50a27aa1 100644
--- a/src/Symfony/Component/Security/Http/Event/InteractiveLoginEvent.php
+++ b/src/Symfony/Component/Security/Http/Event/InteractiveLoginEvent.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Http\Event;
 
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
diff --git a/src/Symfony/Component/Security/Http/Event/SwitchUserEvent.php b/src/Symfony/Component/Security/Http/Event/SwitchUserEvent.php
index 2681fb6c602b..b1b24e3e8335 100644
--- a/src/Symfony/Component/Security/Http/Event/SwitchUserEvent.php
+++ b/src/Symfony/Component/Security/Http/Event/SwitchUserEvent.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Security\Http\Event;
 
+use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
-use Symfony\Component\EventDispatcher\Event;
 
 /**
  * SwitchUserEvent.
diff --git a/src/Symfony/Component/Security/Http/Firewall.php b/src/Symfony/Component/Security/Http/Firewall.php
index 9bee596759bd..831316d9dfe0 100644
--- a/src/Symfony/Component/Security/Http/Firewall.php
+++ b/src/Symfony/Component/Security/Http/Firewall.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Security\Http;
 
-use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
 
 /**
  * Firewall uses a FirewallMap to register security listeners for the given
diff --git a/src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php
index 7002810ed76a..cdf91242dd17 100644
--- a/src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php
@@ -11,25 +11,25 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
-use Symfony\Component\Security\Http\Authentication\AuthenticationFailureHandlerInterface;
-use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
-use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
-use Symfony\Component\Security\Core\Security;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Exception\SessionUnavailableException;
-use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Security\Http\Authentication\AuthenticationFailureHandlerInterface;
+use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
-use Symfony\Component\Security\Http\SecurityEvents;
 use Symfony\Component\Security\Http\HttpUtils;
+use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
+use Symfony\Component\Security\Http\SecurityEvents;
+use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
 
 /**
  * The AbstractAuthenticationListener is the preferred base class for all
diff --git a/src/Symfony/Component/Security/Http/Firewall/AbstractPreAuthenticatedListener.php b/src/Symfony/Component/Security/Http/Firewall/AbstractPreAuthenticatedListener.php
index 20a0d8e1307f..d29f0e0bcc57 100644
--- a/src/Symfony/Component/Security/Http/Firewall/AbstractPreAuthenticatedListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/AbstractPreAuthenticatedListener.php
@@ -11,18 +11,18 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
+use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\PreAuthenticatedToken;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
 
 /**
diff --git a/src/Symfony/Component/Security/Http/Firewall/AccessListener.php b/src/Symfony/Component/Security/Http/Firewall/AccessListener.php
index ec5e217cba9a..e285a249f371 100644
--- a/src/Symfony/Component/Security/Http/Firewall/AccessListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/AccessListener.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
-use Symfony\Component\Security\Http\AccessMapInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\Security\Core\Exception\AuthenticationCredentialsNotFoundException;
+use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
 use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+use Symfony\Component\Security\Core\Exception\AuthenticationCredentialsNotFoundException;
+use Symfony\Component\Security\Http\AccessMapInterface;
 
 /**
  * AccessListener enforces access control rules.
diff --git a/src/Symfony/Component/Security/Http/Firewall/AnonymousAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/AnonymousAuthenticationListener.php
index 106b99f84025..9615ed0b3d93 100644
--- a/src/Symfony/Component/Security/Http/Firewall/AnonymousAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/AnonymousAuthenticationListener.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
-use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\AnonymousToken;
+use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
 /**
  * AnonymousAuthenticationListener automatically adds a Token if none is
diff --git a/src/Symfony/Component/Security/Http/Firewall/BasicAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/BasicAuthenticationListener.php
index 50411eab89ad..77f4c795b6d5 100644
--- a/src/Symfony/Component/Security/Http/Firewall/BasicAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/BasicAuthenticationListener.php
@@ -11,15 +11,15 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;
-use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
 
 /**
diff --git a/src/Symfony/Component/Security/Http/Firewall/ChannelListener.php b/src/Symfony/Component/Security/Http/Firewall/ChannelListener.php
index d0fff2157435..39254c5df343 100644
--- a/src/Symfony/Component/Security/Http/Firewall/ChannelListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/ChannelListener.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\Security\Http\AccessMapInterface;
-use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\Security\Http\AccessMapInterface;
+use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;
 
 /**
  * ChannelListener switches the HTTP protocol based on the access control
diff --git a/src/Symfony/Component/Security/Http/Firewall/ContextListener.php b/src/Symfony/Component/Security/Http/Firewall/ContextListener.php
index 7d3b960a1402..40074cf69b8b 100644
--- a/src/Symfony/Component/Security/Http/Firewall/ContextListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/ContextListener.php
@@ -12,8 +12,9 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolver;
 use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface;
@@ -21,12 +22,11 @@
 use Symfony\Component\Security\Core\Authentication\Token\RememberMeToken;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
+use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\Role\SwitchUserRole;
 use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 /**
  * ContextListener manages the SecurityContext persistence through a session.
@@ -95,7 +95,7 @@ public function handle(GetResponseEvent $event)
         if (null !== $this->logger) {
             $this->logger->debug('Read existing security token from the session.', array(
                 'key' => $this->sessionKey,
-                'token_class' => is_object($token) ? get_class($token) : null,
+                'token_class' => \is_object($token) ? \get_class($token) : null,
             ));
         }
 
@@ -162,7 +162,7 @@ protected function refreshUser(TokenInterface $token)
 
         foreach ($this->userProviders as $provider) {
             if (!$provider instanceof UserProviderInterface) {
-                throw new \InvalidArgumentException(sprintf('User provider "%s" must implement "%s".', get_class($provider), UserProviderInterface::class));
+                throw new \InvalidArgumentException(sprintf('User provider "%s" must implement "%s".', \get_class($provider), UserProviderInterface::class));
             }
 
             try {
@@ -172,14 +172,14 @@ protected function refreshUser(TokenInterface $token)
                 // tokens can be deauthenticated if the user has been changed.
                 if (!$token->isAuthenticated()) {
                     if (null !== $this->logger) {
-                        $this->logger->debug('Token was deauthenticated after trying to refresh it.', array('username' => $refreshedUser->getUsername(), 'provider' => get_class($provider)));
+                        $this->logger->debug('Token was deauthenticated after trying to refresh it.', array('username' => $refreshedUser->getUsername(), 'provider' => \get_class($provider)));
                     }
 
                     return null;
                 }
 
                 if (null !== $this->logger) {
-                    $context = array('provider' => get_class($provider), 'username' => $refreshedUser->getUsername());
+                    $context = array('provider' => \get_class($provider), 'username' => $refreshedUser->getUsername());
 
                     foreach ($token->getRoles() as $role) {
                         if ($role instanceof SwitchUserRole) {
@@ -196,7 +196,7 @@ protected function refreshUser(TokenInterface $token)
                 // let's try the next user provider
             } catch (UsernameNotFoundException $e) {
                 if (null !== $this->logger) {
-                    $this->logger->warning('Username could not be found in the selected user provider.', array('username' => $e->getUsername(), 'provider' => get_class($provider)));
+                    $this->logger->warning('Username could not be found in the selected user provider.', array('username' => $e->getUsername(), 'provider' => \get_class($provider)));
                 }
 
                 $userNotFoundByProvider = true;
@@ -207,7 +207,7 @@ protected function refreshUser(TokenInterface $token)
             return null;
         }
 
-        throw new \RuntimeException(sprintf('There is no user provider for user "%s".', get_class($user)));
+        throw new \RuntimeException(sprintf('There is no user provider for user "%s".', \get_class($user)));
     }
 
     private function safelyUnserialize($serializedToken)
diff --git a/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php b/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php
index 76ae56bd6868..e3009cd07427 100644
--- a/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php
@@ -11,26 +11,26 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
+use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\Security\Http\Authorization\AccessDeniedHandlerInterface;
-use Symfony\Component\Security\Core\Security;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
-use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
 use Symfony\Component\Security\Core\Exception\AccountStatusException;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
-use Symfony\Component\Security\Core\Exception\AccessDeniedException;
 use Symfony\Component\Security\Core\Exception\InsufficientAuthenticationException;
 use Symfony\Component\Security\Core\Exception\LogoutException;
-use Symfony\Component\Security\Http\Util\TargetPathTrait;
+use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Security\Http\Authorization\AccessDeniedHandlerInterface;
+use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;
 use Symfony\Component\Security\Http\HttpUtils;
-use Symfony\Component\HttpFoundation\Request;
-use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
-use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Security\Http\Util\TargetPathTrait;
 
 /**
  * ExceptionListener catches authentication exception and converts them to
@@ -194,9 +194,9 @@ private function startAuthentication(Request $request, AuthenticationException $
         $response = $this->authenticationEntryPoint->start($request, $authException);
 
         if (!$response instanceof Response) {
-            $given = is_object($response) ? get_class($response) : gettype($response);
+            $given = \is_object($response) ? \get_class($response) : \gettype($response);
 
-            throw new \LogicException(sprintf('The %s::start() method must return a Response object (%s returned)', get_class($this->authenticationEntryPoint), $given));
+            throw new \LogicException(sprintf('The %s::start() method must return a Response object (%s returned)', \get_class($this->authenticationEntryPoint), $given));
         }
 
         return $response;
diff --git a/src/Symfony/Component/Security/Http/Firewall/RememberMeListener.php b/src/Symfony/Component/Security/Http/Firewall/RememberMeListener.php
index 07225971b4fd..b81a6712a502 100644
--- a/src/Symfony/Component/Security/Http/Firewall/RememberMeListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/RememberMeListener.php
@@ -12,16 +12,16 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
-use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
+use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 use Symfony\Component\Security\Http\SecurityEvents;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategy;
+use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
 
 /**
  * RememberMeListener implements authentication capabilities via a cookie.
diff --git a/src/Symfony/Component/Security/Http/Firewall/RemoteUserAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/RemoteUserAuthenticationListener.php
index 69dcd4d6f16d..7544d74746e0 100644
--- a/src/Symfony/Component/Security/Http/Firewall/RemoteUserAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/RemoteUserAuthenticationListener.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
-use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
+use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 /**
  * REMOTE_USER authentication listener.
diff --git a/src/Symfony/Component/Security/Http/Firewall/SimpleFormAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/SimpleFormAuthenticationListener.php
index 14dadf3f058d..48db757a94bf 100644
--- a/src/Symfony/Component/Security/Http/Firewall/SimpleFormAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/SimpleFormAuthenticationListener.php
@@ -11,23 +11,23 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
+use Psr\Log\LoggerInterface;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
+use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
+use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Core\Exception\InvalidCsrfTokenException;
+use Symfony\Component\Security\Core\Security;
 use Symfony\Component\Security\Csrf\CsrfToken;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
 use Symfony\Component\Security\Http\Authentication\AuthenticationFailureHandlerInterface;
 use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
-use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Http\Authentication\SimpleFormAuthenticatorInterface;
-use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
-use Symfony\Component\Security\Core\Exception\BadCredentialsException;
-use Symfony\Component\Security\Core\Security;
 use Symfony\Component\Security\Http\HttpUtils;
 use Symfony\Component\Security\Http\ParameterBagUtils;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
-use Psr\Log\LoggerInterface;
 
 /**
  * @author Jordi Boggiano <j.boggiano@seld.be>
diff --git a/src/Symfony/Component/Security/Http/Firewall/SimplePreAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/SimplePreAuthenticationListener.php
index 5e486c453948..01b1b70ce29b 100644
--- a/src/Symfony/Component/Security/Http/Firewall/SimplePreAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/SimplePreAuthenticationListener.php
@@ -11,21 +11,21 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\Security\Http\Authentication\SimplePreAuthenticatorInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\AnonymousToken;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Http\Authentication\AuthenticationFailureHandlerInterface;
 use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
+use Symfony\Component\Security\Http\Authentication\SimplePreAuthenticatorInterface;
 use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
 
 /**
@@ -75,7 +75,7 @@ public function handle(GetResponseEvent $event)
         $request = $event->getRequest();
 
         if (null !== $this->logger) {
-            $this->logger->info('Attempting SimplePreAuthentication.', array('key' => $this->providerKey, 'authenticator' => get_class($this->simpleAuthenticator)));
+            $this->logger->info('Attempting SimplePreAuthentication.', array('key' => $this->providerKey, 'authenticator' => \get_class($this->simpleAuthenticator)));
         }
 
         if (null !== $this->tokenStorage->getToken() && !$this->tokenStorage->getToken() instanceof AnonymousToken) {
@@ -104,7 +104,7 @@ public function handle(GetResponseEvent $event)
             $this->tokenStorage->setToken(null);
 
             if (null !== $this->logger) {
-                $this->logger->info('SimplePreAuthentication request failed.', array('exception' => $e, 'authenticator' => get_class($this->simpleAuthenticator)));
+                $this->logger->info('SimplePreAuthentication request failed.', array('exception' => $e, 'authenticator' => \get_class($this->simpleAuthenticator)));
             }
 
             if ($this->simpleAuthenticator instanceof AuthenticationFailureHandlerInterface) {
@@ -112,7 +112,7 @@ public function handle(GetResponseEvent $event)
                 if ($response instanceof Response) {
                     $event->setResponse($response);
                 } elseif (null !== $response) {
-                    throw new \UnexpectedValueException(sprintf('The %s::onAuthenticationFailure method must return null or a Response object', get_class($this->simpleAuthenticator)));
+                    throw new \UnexpectedValueException(sprintf('The %s::onAuthenticationFailure method must return null or a Response object', \get_class($this->simpleAuthenticator)));
                 }
             }
 
@@ -124,7 +124,7 @@ public function handle(GetResponseEvent $event)
             if ($response instanceof Response) {
                 $event->setResponse($response);
             } elseif (null !== $response) {
-                throw new \UnexpectedValueException(sprintf('The %s::onAuthenticationSuccess method must return null or a Response object', get_class($this->simpleAuthenticator)));
+                throw new \UnexpectedValueException(sprintf('The %s::onAuthenticationSuccess method must return null or a Response object', \get_class($this->simpleAuthenticator)));
             }
         }
     }
diff --git a/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php b/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
index 7de596db27a7..1687a36d74a1 100644
--- a/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
@@ -11,24 +11,24 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\Security\Core\Exception\AccessDeniedException;
-use Symfony\Component\Security\Core\User\UserInterface;
-use Symfony\Component\Security\Core\User\UserProviderInterface;
-use Symfony\Component\Security\Core\User\UserCheckerInterface;
-use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
 use Psr\Log\LoggerInterface;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Security\Core\Role\SwitchUserRole;
-use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
-use Symfony\Component\Security\Core\Exception\AuthenticationCredentialsNotFoundException;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
+use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+use Symfony\Component\Security\Core\Exception\AuthenticationCredentialsNotFoundException;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Core\Role\SwitchUserRole;
+use Symfony\Component\Security\Core\User\UserCheckerInterface;
+use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Http\Event\SwitchUserEvent;
 use Symfony\Component\Security\Http\SecurityEvents;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 /**
  * SwitchUserListener allows a user to impersonate another one temporarily
diff --git a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php
index c4ee1bffaf31..639d5af17d98 100644
--- a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php
@@ -11,23 +11,23 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\HttpFoundation\Request;
 use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
-use Symfony\Component\Security\Csrf\CsrfToken;
-use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
-use Symfony\Component\Security\Http\Authentication\AuthenticationFailureHandlerInterface;
-use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
-use Symfony\Component\Security\Http\ParameterBagUtils;
-use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
-use Symfony\Component\Security\Http\HttpUtils;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 use Symfony\Component\Security\Core\Exception\InvalidCsrfTokenException;
 use Symfony\Component\Security\Core\Security;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Security\Csrf\CsrfToken;
+use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
+use Symfony\Component\Security\Http\Authentication\AuthenticationFailureHandlerInterface;
+use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
+use Symfony\Component\Security\Http\HttpUtils;
+use Symfony\Component\Security\Http\ParameterBagUtils;
+use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
 
 /**
  * UsernamePasswordFormAuthenticationListener is the default implementation of
@@ -91,7 +91,7 @@ protected function attemptAuthentication(Request $request)
 
         $username = trim($username);
 
-        if (strlen($username) > Security::MAX_USERNAME_LENGTH) {
+        if (\strlen($username) > Security::MAX_USERNAME_LENGTH) {
             throw new BadCredentialsException('Invalid username.');
         }
 
diff --git a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
index 2db39a4e9aed..f0f1e42d7ab0 100644
--- a/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php
@@ -104,15 +104,15 @@ public function handle(GetResponseEvent $event)
                 throw new BadRequestHttpException(sprintf('The key "%s" must be provided.', $this->options['password_path']), $e);
             }
 
-            if (!is_string($username)) {
+            if (!\is_string($username)) {
                 throw new BadRequestHttpException(sprintf('The key "%s" must be a string.', $this->options['username_path']));
             }
 
-            if (strlen($username) > Security::MAX_USERNAME_LENGTH) {
+            if (\strlen($username) > Security::MAX_USERNAME_LENGTH) {
                 throw new BadCredentialsException('Invalid username.');
             }
 
-            if (!is_string($password)) {
+            if (!\is_string($password)) {
                 throw new BadRequestHttpException(sprintf('The key "%s" must be a string.', $this->options['password_path']));
             }
 
diff --git a/src/Symfony/Component/Security/Http/Firewall/X509AuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/X509AuthenticationListener.php
index f4957bbf65f1..bb395e16d586 100644
--- a/src/Symfony/Component/Security/Http/Firewall/X509AuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/X509AuthenticationListener.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Security\Http\Firewall;
 
-use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
-use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
+use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Exception\BadCredentialsException;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 
 /**
  * X509 authentication listener.
diff --git a/src/Symfony/Component/Security/Http/FirewallMap.php b/src/Symfony/Component/Security/Http/FirewallMap.php
index fc97410d4e69..0f0c1fbefff1 100644
--- a/src/Symfony/Component/Security/Http/FirewallMap.php
+++ b/src/Symfony/Component/Security/Http/FirewallMap.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Http;
 
-use Symfony\Component\HttpFoundation\RequestMatcherInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestMatcherInterface;
 use Symfony\Component\Security\Http\Firewall\ExceptionListener;
 use Symfony\Component\Security\Http\Firewall\LogoutListener;
 
diff --git a/src/Symfony/Component/Security/Http/HttpUtils.php b/src/Symfony/Component/Security/Http/HttpUtils.php
index a55421340d49..d82bc324e6f7 100644
--- a/src/Symfony/Component/Security/Http/HttpUtils.php
+++ b/src/Symfony/Component/Security/Http/HttpUtils.php
@@ -11,13 +11,13 @@
 
 namespace Symfony\Component\Security\Http;
 
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RedirectResponse;
-use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
-use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
-use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
+use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
 use Symfony\Component\Security\Core\Security;
 
 /**
diff --git a/src/Symfony/Component/Security/Http/Logout/CookieClearingLogoutHandler.php b/src/Symfony/Component/Security/Http/Logout/CookieClearingLogoutHandler.php
index b96bc43a78d5..2aa7c732b976 100644
--- a/src/Symfony/Component/Security/Http/Logout/CookieClearingLogoutHandler.php
+++ b/src/Symfony/Component/Security/Http/Logout/CookieClearingLogoutHandler.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\Logout;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * This handler clears the passed cookies when a user logs out.
diff --git a/src/Symfony/Component/Security/Http/Logout/LogoutHandlerInterface.php b/src/Symfony/Component/Security/Http/Logout/LogoutHandlerInterface.php
index 363bc4abe163..92076a94ccc1 100644
--- a/src/Symfony/Component/Security/Http/Logout/LogoutHandlerInterface.php
+++ b/src/Symfony/Component/Security/Http/Logout/LogoutHandlerInterface.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\Logout;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * Interface that needs to be implemented by LogoutHandlers.
diff --git a/src/Symfony/Component/Security/Http/Logout/SessionLogoutHandler.php b/src/Symfony/Component/Security/Http/Logout/SessionLogoutHandler.php
index 7f362de9d7a2..d4f7cbe7cb8d 100644
--- a/src/Symfony/Component/Security/Http/Logout/SessionLogoutHandler.php
+++ b/src/Symfony/Component/Security/Http/Logout/SessionLogoutHandler.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\Logout;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * Handler for clearing invalidating the current session.
diff --git a/src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php b/src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php
index 64ea8352ac3b..34ba4ef77515 100644
--- a/src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php
+++ b/src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php
@@ -11,18 +11,18 @@
 
 namespace Symfony\Component\Security\Http\RememberMe;
 
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
-use Symfony\Component\Security\Core\User\UserInterface;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Core\Authentication\Token\RememberMeToken;
-use Symfony\Component\Security\Http\Logout\LogoutHandlerInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Core\Exception\CookieTheftException;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
-use Symfony\Component\Security\Core\Exception\CookieTheftException;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Cookie;
-use Psr\Log\LoggerInterface;
+use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Security\Http\Logout\LogoutHandlerInterface;
 use Symfony\Component\Security\Http\ParameterBagUtils;
 
 /**
@@ -54,7 +54,7 @@ public function __construct(array $userProviders, string $secret, string $provid
         if (empty($providerKey)) {
             throw new \InvalidArgumentException('$providerKey must not be empty.');
         }
-        if (0 === count($userProviders)) {
+        if (0 === \count($userProviders)) {
             throw new \InvalidArgumentException('You must provide at least one user provider.');
         }
 
diff --git a/src/Symfony/Component/Security/Http/RememberMe/PersistentTokenBasedRememberMeServices.php b/src/Symfony/Component/Security/Http/RememberMe/PersistentTokenBasedRememberMeServices.php
index d18c35616481..dcb7e1e64e06 100644
--- a/src/Symfony/Component/Security/Http/RememberMe/PersistentTokenBasedRememberMeServices.php
+++ b/src/Symfony/Component/Security/Http/RememberMe/PersistentTokenBasedRememberMeServices.php
@@ -11,14 +11,14 @@
 
 namespace Symfony\Component\Security\Http\RememberMe;
 
-use Symfony\Component\Security\Core\Authentication\RememberMe\TokenProviderInterface;
 use Symfony\Component\HttpFoundation\Cookie;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Security\Core\Exception\AuthenticationException;
-use Symfony\Component\Security\Core\Exception\CookieTheftException;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentToken;
+use Symfony\Component\Security\Core\Authentication\RememberMe\TokenProviderInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Core\Exception\CookieTheftException;
 
 /**
  * Concrete implementation of the RememberMeServicesInterface which needs
@@ -47,7 +47,7 @@ protected function cancelCookie(Request $request)
 
         // Delete cookie from the tokenProvider
         if (null !== ($cookie = $request->cookies->get($this->options['name']))
-            && 2 === count($parts = $this->decodeCookie($cookie))
+            && 2 === \count($parts = $this->decodeCookie($cookie))
         ) {
             list($series) = $parts;
             $this->tokenProvider->deleteTokenBySeries($series);
@@ -59,7 +59,7 @@ protected function cancelCookie(Request $request)
      */
     protected function processAutoLoginCookie(array $cookieParts, Request $request)
     {
-        if (2 !== count($cookieParts)) {
+        if (2 !== \count($cookieParts)) {
             throw new AuthenticationException('The cookie is invalid.');
         }
 
@@ -101,7 +101,7 @@ protected function onLoginSuccess(Request $request, Response $response, TokenInt
 
         $this->tokenProvider->createNewToken(
             new PersistentToken(
-                get_class($user = $token->getUser()),
+                \get_class($user = $token->getUser()),
                 $user->getUsername(),
                 $series,
                 $tokenValue,
diff --git a/src/Symfony/Component/Security/Http/RememberMe/RememberMeServicesInterface.php b/src/Symfony/Component/Security/Http/RememberMe/RememberMeServicesInterface.php
index f942b21fdaf1..fe8b0faee545 100644
--- a/src/Symfony/Component/Security/Http/RememberMe/RememberMeServicesInterface.php
+++ b/src/Symfony/Component/Security/Http/RememberMe/RememberMeServicesInterface.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\RememberMe;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * Interface that needs to be implemented by classes which provide remember-me
diff --git a/src/Symfony/Component/Security/Http/RememberMe/ResponseListener.php b/src/Symfony/Component/Security/Http/RememberMe/ResponseListener.php
index e8c4424ac79e..5467e02365e7 100644
--- a/src/Symfony/Component/Security/Http/RememberMe/ResponseListener.php
+++ b/src/Symfony/Component/Security/Http/RememberMe/ResponseListener.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Security\Http\RememberMe;
 
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * Adds remember-me cookies to the Response.
diff --git a/src/Symfony/Component/Security/Http/RememberMe/TokenBasedRememberMeServices.php b/src/Symfony/Component/Security/Http/RememberMe/TokenBasedRememberMeServices.php
index d6254dff0a2a..dce2026f3a13 100644
--- a/src/Symfony/Component/Security/Http/RememberMe/TokenBasedRememberMeServices.php
+++ b/src/Symfony/Component/Security/Http/RememberMe/TokenBasedRememberMeServices.php
@@ -31,7 +31,7 @@ class TokenBasedRememberMeServices extends AbstractRememberMeServices
      */
     protected function processAutoLoginCookie(array $cookieParts, Request $request)
     {
-        if (4 !== count($cookieParts)) {
+        if (4 !== \count($cookieParts)) {
             throw new AuthenticationException('The cookie is invalid.');
         }
 
@@ -50,7 +50,7 @@ protected function processAutoLoginCookie(array $cookieParts, Request $request)
         }
 
         if (!$user instanceof UserInterface) {
-            throw new \RuntimeException(sprintf('The UserProviderInterface implementation must return an instance of UserInterface, but returned "%s".', get_class($user)));
+            throw new \RuntimeException(sprintf('The UserProviderInterface implementation must return an instance of UserInterface, but returned "%s".', \get_class($user)));
         }
 
         if (true !== hash_equals($this->generateCookieHash($class, $username, $expires, $user->getPassword()), $hash)) {
@@ -71,7 +71,7 @@ protected function onLoginSuccess(Request $request, Response $response, TokenInt
     {
         $user = $token->getUser();
         $expires = time() + $this->options['lifetime'];
-        $value = $this->generateCookieValue(get_class($user), $user->getUsername(), $expires, $user->getPassword());
+        $value = $this->generateCookieValue(\get_class($user), $user->getUsername(), $expires, $user->getPassword());
 
         $response->headers->setCookie(
             new Cookie(
diff --git a/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategy.php b/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategy.php
index c61fe349f8f4..a20619af1df5 100644
--- a/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategy.php
+++ b/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategy.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Http\Session;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * The default session strategy implementation.
diff --git a/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategyInterface.php b/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategyInterface.php
index 8de89b1868d1..a45f852d59b5 100644
--- a/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategyInterface.php
+++ b/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategyInterface.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Security\Http\Session;
 
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 
 /**
  * SessionAuthenticationStrategyInterface.
diff --git a/src/Symfony/Component/Security/Http/Tests/Authentication/DefaultAuthenticationFailureHandlerTest.php b/src/Symfony/Component/Security/Http/Tests/Authentication/DefaultAuthenticationFailureHandlerTest.php
index 56e5390ef5a6..cc2f504b8868 100644
--- a/src/Symfony/Component/Security/Http/Tests/Authentication/DefaultAuthenticationFailureHandlerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Authentication/DefaultAuthenticationFailureHandlerTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Security\Http\Tests\Authentication;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Http\Authentication\DefaultAuthenticationFailureHandler;
-use Symfony\Component\Security\Core\Security;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Security\Http\Authentication\DefaultAuthenticationFailureHandler;
 
 class DefaultAuthenticationFailureHandlerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/EntryPoint/BasicAuthenticationEntryPointTest.php b/src/Symfony/Component/Security/Http/Tests/EntryPoint/BasicAuthenticationEntryPointTest.php
index a089e90cc558..711d4e2f1fc2 100644
--- a/src/Symfony/Component/Security/Http/Tests/EntryPoint/BasicAuthenticationEntryPointTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/EntryPoint/BasicAuthenticationEntryPointTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Security\Http\Tests\EntryPoint;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Http\EntryPoint\BasicAuthenticationEntryPoint;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Http\EntryPoint\BasicAuthenticationEntryPoint;
 
 class BasicAuthenticationEntryPointTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/EntryPoint/FormAuthenticationEntryPointTest.php b/src/Symfony/Component/Security/Http/Tests/EntryPoint/FormAuthenticationEntryPointTest.php
index d95c703c68bc..2e43f4ba63d6 100644
--- a/src/Symfony/Component/Security/Http/Tests/EntryPoint/FormAuthenticationEntryPointTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/EntryPoint/FormAuthenticationEntryPointTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\Security\Http\EntryPoint\FormAuthenticationEntryPoint;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\Security\Http\EntryPoint\FormAuthenticationEntryPoint;
 
 class FormAuthenticationEntryPointTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/EntryPoint/RetryAuthenticationEntryPointTest.php b/src/Symfony/Component/Security/Http/Tests/EntryPoint/RetryAuthenticationEntryPointTest.php
index f2fa5bcf191a..abd90fb4ae78 100644
--- a/src/Symfony/Component/Security/Http/Tests/EntryPoint/RetryAuthenticationEntryPointTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/EntryPoint/RetryAuthenticationEntryPointTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Security\Http\Tests\EntryPoint;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Http\EntryPoint\RetryAuthenticationEntryPoint;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Http\EntryPoint\RetryAuthenticationEntryPoint;
 
 class RetryAuthenticationEntryPointTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/Firewall/BasicAuthenticationListenerTest.php b/src/Symfony/Component/Security/Http/Tests/Firewall/BasicAuthenticationListenerTest.php
index e71715f705a8..269dbaeeaa57 100644
--- a/src/Symfony/Component/Security/Http/Tests/Firewall/BasicAuthenticationListenerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Firewall/BasicAuthenticationListenerTest.php
@@ -13,11 +13,11 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Core\Authentication\AuthenticationProviderManager;
 use Symfony\Component\Security\Core\Authentication\Token\PreAuthenticatedToken;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Http\Firewall\BasicAuthenticationListener;
-use Symfony\Component\Security\Core\Authentication\AuthenticationProviderManager;
 
 class BasicAuthenticationListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/Firewall/ChannelListenerTest.php b/src/Symfony/Component/Security/Http/Tests/Firewall/ChannelListenerTest.php
index 53ff1dcf0e8e..3016269c04b2 100644
--- a/src/Symfony/Component/Security/Http/Tests/Firewall/ChannelListenerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Firewall/ChannelListenerTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Security\Http\Tests\Firewall;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Http\Firewall\ChannelListener;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Security\Http\Firewall\ChannelListener;
 
 class ChannelListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/Firewall/ContextListenerTest.php b/src/Symfony/Component/Security/Http/Tests/Firewall/ContextListenerTest.php
index 16b7fb2bf847..f38ddfdf979e 100644
--- a/src/Symfony/Component/Security/Http/Tests/Firewall/ContextListenerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Firewall/ContextListenerTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Security\Http\Tests\Firewall;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Session\Session;
@@ -30,7 +31,6 @@
 use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Http\Firewall\ContextListener;
-use Symfony\Component\EventDispatcher\EventDispatcher;
 
 class ContextListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/Firewall/RememberMeListenerTest.php b/src/Symfony/Component/Security/Http/Tests/Firewall/RememberMeListenerTest.php
index fb2745302940..9acb80413263 100644
--- a/src/Symfony/Component/Security/Http/Tests/Firewall/RememberMeListenerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Firewall/RememberMeListenerTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Security\Http\Tests\Firewall;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Http\Firewall\RememberMeListener;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Http\SecurityEvents;
 
 class RememberMeListenerTest extends TestCase
diff --git a/src/Symfony/Component/Security/Http/Tests/FirewallMapTest.php b/src/Symfony/Component/Security/Http/Tests/FirewallMapTest.php
index 2a62f21d33ad..5cd9d7dea353 100644
--- a/src/Symfony/Component/Security/Http/Tests/FirewallMapTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/FirewallMapTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Security\Http\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Http\FirewallMap;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Security\Http\FirewallMap;
 
 class FirewallMapTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/HttpUtilsTest.php b/src/Symfony/Component/Security/Http/Tests/HttpUtilsTest.php
index 98476f2ff3ec..28b242995d4b 100644
--- a/src/Symfony/Component/Security/Http/Tests/HttpUtilsTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/HttpUtilsTest.php
@@ -15,8 +15,8 @@
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
-use Symfony\Component\Security\Core\Security;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Security\Core\Security;
 use Symfony\Component\Security\Http\HttpUtils;
 
 class HttpUtilsTest extends TestCase
diff --git a/src/Symfony/Component/Security/Http/Tests/Logout/CookieClearingLogoutHandlerTest.php b/src/Symfony/Component/Security/Http/Tests/Logout/CookieClearingLogoutHandlerTest.php
index 0cc241b74a0a..f199d0ee03cb 100644
--- a/src/Symfony/Component/Security/Http/Tests/Logout/CookieClearingLogoutHandlerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Logout/CookieClearingLogoutHandlerTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Security\Http\Tests\Logout;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\ResponseHeaderBag;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Security\Http\Logout\CookieClearingLogoutHandler;
 
 class CookieClearingLogoutHandlerTest extends TestCase
diff --git a/src/Symfony/Component/Security/Http/Tests/RememberMe/AbstractRememberMeServicesTest.php b/src/Symfony/Component/Security/Http/Tests/RememberMe/AbstractRememberMeServicesTest.php
index 886743c1d355..5a35dd09ee21 100644
--- a/src/Symfony/Component/Security/Http/Tests/RememberMe/AbstractRememberMeServicesTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/RememberMe/AbstractRememberMeServicesTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Security\Http\Tests\RememberMe;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Http\RememberMe\AbstractRememberMeServices;
+use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 
 class AbstractRememberMeServicesTest extends TestCase
 {
@@ -304,7 +304,7 @@ protected function getProvider()
 
     private function callProtected($object, $method, array $args)
     {
-        $reflection = new \ReflectionClass(get_class($object));
+        $reflection = new \ReflectionClass(\get_class($object));
         $reflectionMethod = $reflection->getMethod($method);
         $reflectionMethod->setAccessible(true);
 
diff --git a/src/Symfony/Component/Security/Http/Tests/RememberMe/PersistentTokenBasedRememberMeServicesTest.php b/src/Symfony/Component/Security/Http/Tests/RememberMe/PersistentTokenBasedRememberMeServicesTest.php
index b35215229f56..cf142ea2adca 100644
--- a/src/Symfony/Component/Security/Http/Tests/RememberMe/PersistentTokenBasedRememberMeServicesTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/RememberMe/PersistentTokenBasedRememberMeServicesTest.php
@@ -12,15 +12,15 @@
 namespace Symfony\Component\Security\Http\Tests\RememberMe;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
-use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
-use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentToken;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\ResponseHeaderBag;
-use Symfony\Component\Security\Http\RememberMe\PersistentTokenBasedRememberMeServices;
-use Symfony\Component\Security\Core\Exception\TokenNotFoundException;
+use Symfony\Component\Security\Core\Authentication\RememberMe\PersistentToken;
 use Symfony\Component\Security\Core\Exception\CookieTheftException;
+use Symfony\Component\Security\Core\Exception\TokenNotFoundException;
+use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
+use Symfony\Component\Security\Http\RememberMe\PersistentTokenBasedRememberMeServices;
+use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 
 class PersistentTokenBasedRememberMeServicesTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/RememberMe/ResponseListenerTest.php b/src/Symfony/Component/Security/Http/Tests/RememberMe/ResponseListenerTest.php
index bc10698f0fb4..ba5906839467 100644
--- a/src/Symfony/Component/Security/Http/Tests/RememberMe/ResponseListenerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/RememberMe/ResponseListenerTest.php
@@ -12,13 +12,13 @@
 namespace Symfony\Component\Security\Http\Tests\RememberMe;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\Security\Http\RememberMe\ResponseListener;
-use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
+use Symfony\Component\HttpFoundation\Cookie;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
+use Symfony\Component\Security\Http\RememberMe\ResponseListener;
 
 class ResponseListenerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Security/Http/Tests/RememberMe/TokenBasedRememberMeServicesTest.php b/src/Symfony/Component/Security/Http/Tests/RememberMe/TokenBasedRememberMeServicesTest.php
index 7405519964cd..e30d68ba6951 100644
--- a/src/Symfony/Component/Security/Http/Tests/RememberMe/TokenBasedRememberMeServicesTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/RememberMe/TokenBasedRememberMeServicesTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Security\Http\Tests\RememberMe;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
-use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\ResponseHeaderBag;
+use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
+use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 use Symfony\Component\Security\Http\RememberMe\TokenBasedRememberMeServices;
 
 class TokenBasedRememberMeServicesTest extends TestCase
diff --git a/src/Symfony/Component/Serializer/Annotation/MaxDepth.php b/src/Symfony/Component/Serializer/Annotation/MaxDepth.php
index 1f41948d6da2..a274c20d8528 100644
--- a/src/Symfony/Component/Serializer/Annotation/MaxDepth.php
+++ b/src/Symfony/Component/Serializer/Annotation/MaxDepth.php
@@ -31,11 +31,11 @@ class MaxDepth
     public function __construct(array $data)
     {
         if (!isset($data['value'])) {
-            throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" should be set.', get_class($this)));
+            throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" should be set.', \get_class($this)));
         }
 
-        if (!is_int($data['value']) || $data['value'] <= 0) {
-            throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" must be a positive integer.', get_class($this)));
+        if (!\is_int($data['value']) || $data['value'] <= 0) {
+            throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" must be a positive integer.', \get_class($this)));
         }
 
         $this->maxDepth = $data['value'];
diff --git a/src/Symfony/Component/Serializer/DependencyInjection/SerializerPass.php b/src/Symfony/Component/Serializer/DependencyInjection/SerializerPass.php
index b43d54c291ba..155a6f00ecb4 100644
--- a/src/Symfony/Component/Serializer/DependencyInjection/SerializerPass.php
+++ b/src/Symfony/Component/Serializer/DependencyInjection/SerializerPass.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Serializer\DependencyInjection;
 
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\PriorityTaggedServiceTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**
diff --git a/src/Symfony/Component/Serializer/Encoder/CsvEncoder.php b/src/Symfony/Component/Serializer/Encoder/CsvEncoder.php
index 31a65d32d92d..d8ad5a3b708c 100644
--- a/src/Symfony/Component/Serializer/Encoder/CsvEncoder.php
+++ b/src/Symfony/Component/Serializer/Encoder/CsvEncoder.php
@@ -48,7 +48,7 @@ public function encode($data, $format, array $context = array())
     {
         $handle = fopen('php://temp,', 'w+');
 
-        if (!is_array($data)) {
+        if (!\is_array($data)) {
             $data = array(array($data));
         } elseif (empty($data)) {
             $data = array(array());
@@ -56,7 +56,7 @@ public function encode($data, $format, array $context = array())
             // Sequential arrays of arrays are considered as collections
             $i = 0;
             foreach ($data as $key => $value) {
-                if ($i !== $key || !is_array($value)) {
+                if ($i !== $key || !\is_array($value)) {
                     $data = array($data);
                     break;
                 }
@@ -115,7 +115,7 @@ public function decode($data, $format, array $context = array())
         list($delimiter, $enclosure, $escapeChar, $keySeparator) = $this->getCsvOptions($context);
 
         while (false !== ($cols = fgetcsv($handle, 0, $delimiter, $enclosure, $escapeChar))) {
-            $nbCols = count($cols);
+            $nbCols = \count($cols);
 
             if (null === $headers) {
                 $nbHeaders = $nbCols;
@@ -123,7 +123,7 @@ public function decode($data, $format, array $context = array())
                 foreach ($cols as $col) {
                     $header = explode($keySeparator, $col);
                     $headers[] = $header;
-                    $headerCount[] = count($header);
+                    $headerCount[] = \count($header);
                 }
 
                 continue;
@@ -175,7 +175,7 @@ public function supportsDecoding($format)
     private function flatten(array $array, array &$result, string $keySeparator, string $parentKey = '')
     {
         foreach ($array as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $this->flatten($value, $result, $keySeparator, $parentKey.$key.$keySeparator);
             } else {
                 $result[$parentKey.$key] = $value;
@@ -191,8 +191,8 @@ private function getCsvOptions(array $context)
         $keySeparator = isset($context[self::KEY_SEPARATOR_KEY]) ? $context[self::KEY_SEPARATOR_KEY] : $this->keySeparator;
         $headers = isset($context[self::HEADERS_KEY]) ? $context[self::HEADERS_KEY] : array();
 
-        if (!is_array($headers)) {
-            throw new InvalidArgumentException(sprintf('The "%s" context variable must be an array or null, given "%s".', self::HEADERS_KEY, gettype($headers)));
+        if (!\is_array($headers)) {
+            throw new InvalidArgumentException(sprintf('The "%s" context variable must be an array or null, given "%s".', self::HEADERS_KEY, \gettype($headers)));
         }
 
         return array($delimiter, $enclosure, $escapeChar, $keySeparator, $headers);
@@ -216,11 +216,11 @@ private function extractHeaders(array $data)
                 }
 
                 if (null === $previousHeader) {
-                    $n = count($headers);
+                    $n = \count($headers);
                 } else {
                     $n = $flippedHeaders[$previousHeader] + 1;
 
-                    for ($j = count($headers); $j > $n; --$j) {
+                    for ($j = \count($headers); $j > $n; --$j) {
                         ++$flippedHeaders[$headers[$j] = $headers[$j - 1]];
                     }
                 }
diff --git a/src/Symfony/Component/Serializer/Mapping/Factory/ClassResolverTrait.php b/src/Symfony/Component/Serializer/Mapping/Factory/ClassResolverTrait.php
index e93277a6be76..6bb647ebeea8 100644
--- a/src/Symfony/Component/Serializer/Mapping/Factory/ClassResolverTrait.php
+++ b/src/Symfony/Component/Serializer/Mapping/Factory/ClassResolverTrait.php
@@ -33,7 +33,7 @@ trait ClassResolverTrait
      */
     private function getClass($value)
     {
-        if (is_string($value)) {
+        if (\is_string($value)) {
             if (!class_exists($value) && !interface_exists($value)) {
                 throw new InvalidArgumentException(sprintf('The class or interface "%s" does not exist.', $value));
             }
@@ -41,10 +41,10 @@ private function getClass($value)
             return ltrim($value, '\\');
         }
 
-        if (!is_object($value)) {
-            throw new InvalidArgumentException(sprintf('Cannot create metadata for non-objects. Got: "%s"', gettype($value)));
+        if (!\is_object($value)) {
+            throw new InvalidArgumentException(sprintf('Cannot create metadata for non-objects. Got: "%s"', \gettype($value)));
         }
 
-        return get_class($value);
+        return \get_class($value);
     }
 }
diff --git a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
index ca9d43e15b79..886da0d1b509 100644
--- a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
@@ -77,7 +77,7 @@ public function loadClassMetadata(ClassMetadataInterface $classMetadata)
                 }
 
                 if (isset($data['max_depth'])) {
-                    if (!is_int($data['max_depth'])) {
+                    if (!\is_int($data['max_depth'])) {
                         throw new MappingException(sprintf('The "max_depth" value must be an integer in "%s" for the attribute "%s" of the class "%s".', $this->file, $attribute, $classMetadata->getName()));
                     }
 
diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
index 53f854ecbbda..78144fcc8a70 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
@@ -15,8 +15,8 @@
 use Symfony\Component\Serializer\Exception\InvalidArgumentException;
 use Symfony\Component\Serializer\Exception\LogicException;
 use Symfony\Component\Serializer\Exception\RuntimeException;
-use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
 use Symfony\Component\Serializer\Mapping\AttributeMetadataInterface;
+use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
 use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
 use Symfony\Component\Serializer\SerializerAwareInterface;
 use Symfony\Component\Serializer\SerializerAwareTrait;
@@ -250,7 +250,7 @@ protected function getAllowedAttributes($classOrObject, array $context, $attribu
      */
     protected function isAllowedAttribute($classOrObject, $attribute, $format = null, array $context = array())
     {
-        if (in_array($attribute, $this->ignoredAttributes)) {
+        if (\in_array($attribute, $this->ignoredAttributes)) {
             return false;
         }
 
@@ -259,8 +259,8 @@ protected function isAllowedAttribute($classOrObject, $attribute, $format = null
             return true;
         }
 
-        if (isset($context[self::ATTRIBUTES]) && is_array($context[self::ATTRIBUTES])) {
-            return in_array($attribute, $context[self::ATTRIBUTES], true);
+        if (isset($context[self::ATTRIBUTES]) && \is_array($context[self::ATTRIBUTES])) {
+            return \in_array($attribute, $context[self::ATTRIBUTES], true);
         }
 
         return true;
diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
index 1f7307664a84..74e549df415b 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
@@ -12,12 +12,12 @@
 namespace Symfony\Component\Serializer\Normalizer;
 
 use Symfony\Component\PropertyAccess\Exception\InvalidArgumentException;
+use Symfony\Component\PropertyInfo\PropertyTypeExtractorInterface;
+use Symfony\Component\PropertyInfo\Type;
 use Symfony\Component\Serializer\Encoder\JsonEncoder;
 use Symfony\Component\Serializer\Exception\ExtraAttributesException;
 use Symfony\Component\Serializer\Exception\LogicException;
 use Symfony\Component\Serializer\Exception\NotNormalizableValueException;
-use Symfony\Component\PropertyInfo\PropertyTypeExtractorInterface;
-use Symfony\Component\PropertyInfo\Type;
 use Symfony\Component\Serializer\Mapping\AttributeMetadataInterface;
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
 use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
@@ -68,7 +68,7 @@ public function normalize($object, $format = null, array $context = array())
         $data = array();
         $stack = array();
         $attributes = $this->getAttributes($object, $format, $context);
-        $class = get_class($object);
+        $class = \get_class($object);
         $attributesMetadata = $this->classMetadataFactory ? $this->classMetadataFactory->getMetadataFor($class)->getAttributesMetadata() : null;
 
         foreach ($attributes as $attribute) {
@@ -79,7 +79,7 @@ public function normalize($object, $format = null, array $context = array())
             $attributeValue = $this->getAttributeValue($object, $attribute, $format, $context);
 
             if (isset($this->callbacks[$attribute])) {
-                $attributeValue = call_user_func($this->callbacks[$attribute], $attributeValue);
+                $attributeValue = \call_user_func($this->callbacks[$attribute], $attributeValue);
             }
 
             if (null !== $attributeValue && !is_scalar($attributeValue)) {
@@ -111,7 +111,7 @@ public function normalize($object, $format = null, array $context = array())
      */
     protected function getAttributes($object, $format = null, array $context)
     {
-        $class = get_class($object);
+        $class = \get_class($object);
         $key = $class.'-'.$context['cache_key'];
 
         if (isset($this->attributesCache[$key])) {
@@ -191,7 +191,7 @@ public function denormalize($data, $class, $format = null, array $context = arra
                 $attribute = $this->nameConverter->denormalize($attribute);
             }
 
-            if ((false !== $allowedAttributes && !in_array($attribute, $allowedAttributes)) || !$this->isAllowedAttribute($class, $attribute, $format, $context)) {
+            if ((false !== $allowedAttributes && !\in_array($attribute, $allowedAttributes)) || !$this->isAllowedAttribute($class, $attribute, $format, $context)) {
                 if (isset($context[self::ALLOW_EXTRA_ATTRIBUTES]) && !$context[self::ALLOW_EXTRA_ATTRIBUTES]) {
                     $extraAttributes[] = $attribute;
                 }
@@ -253,7 +253,7 @@ private function validateAndDenormalize(string $currentClass, string $attribute,
 
                 // Fix a collection that contains the only one element
                 // This is special to xml format only
-                if ('xml' === $format && !is_int(key($data))) {
+                if ('xml' === $format && !\is_int(key($data))) {
                     $data = array($data);
                 }
 
@@ -284,11 +284,11 @@ private function validateAndDenormalize(string $currentClass, string $attribute,
             // PHP's json_decode automatically converts Numbers without a decimal part to integers.
             // To circumvent this behavior, integers are converted to floats when denormalizing JSON based formats and when
             // a float is expected.
-            if (Type::BUILTIN_TYPE_FLOAT === $builtinType && is_int($data) && false !== strpos($format, JsonEncoder::FORMAT)) {
+            if (Type::BUILTIN_TYPE_FLOAT === $builtinType && \is_int($data) && false !== strpos($format, JsonEncoder::FORMAT)) {
                 return (float) $data;
             }
 
-            if (call_user_func('is_'.$builtinType, $data)) {
+            if (\call_user_func('is_'.$builtinType, $data)) {
                 return $data;
             }
         }
@@ -297,7 +297,7 @@ private function validateAndDenormalize(string $currentClass, string $attribute,
             return $data;
         }
 
-        throw new NotNormalizableValueException(sprintf('The type of the "%s" attribute for class "%s" must be one of "%s" ("%s" given).', $attribute, $currentClass, implode('", "', array_keys($expectedTypes)), gettype($data)));
+        throw new NotNormalizableValueException(sprintf('The type of the "%s" attribute for class "%s" must be one of "%s" ("%s" given).', $attribute, $currentClass, implode('", "', array_keys($expectedTypes)), \gettype($data)));
     }
 
     /**
diff --git a/src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php b/src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
index 88424134466c..5d9e32ef1285 100644
--- a/src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
@@ -41,8 +41,8 @@ public function denormalize($data, $class, $format = null, array $context = arra
         if (null === $this->serializer) {
             throw new BadMethodCallException('Please set a serializer before calling denormalize()!');
         }
-        if (!is_array($data)) {
-            throw new InvalidArgumentException('Data expected to be an array, '.gettype($data).' given.');
+        if (!\is_array($data)) {
+            throw new InvalidArgumentException('Data expected to be an array, '.\gettype($data).' given.');
         }
         if ('[]' !== substr($class, -2)) {
             throw new InvalidArgumentException('Unsupported class: '.$class);
@@ -53,8 +53,8 @@ public function denormalize($data, $class, $format = null, array $context = arra
 
         $builtinType = isset($context['key_type']) ? $context['key_type']->getBuiltinType() : null;
         foreach ($data as $key => $value) {
-            if (null !== $builtinType && !call_user_func('is_'.$builtinType, $key)) {
-                throw new NotNormalizableValueException(sprintf('The type of the key "%s" must be "%s" ("%s" given).', $key, $builtinType, gettype($key)));
+            if (null !== $builtinType && !\call_user_func('is_'.$builtinType, $key)) {
+                throw new NotNormalizableValueException(sprintf('The type of the key "%s" must be "%s" ("%s" given).', $key, $builtinType, \gettype($key)));
             }
 
             $data[$key] = $serializer->denormalize($value, $class, $format, $context);
diff --git a/src/Symfony/Component/Serializer/Normalizer/DateIntervalNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/DateIntervalNormalizer.php
index 7ab102ed7a9e..9c2bbe5ea122 100644
--- a/src/Symfony/Component/Serializer/Normalizer/DateIntervalNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/DateIntervalNormalizer.php
@@ -63,8 +63,8 @@ public function supportsNormalization($data, $format = null)
      */
     public function denormalize($data, $class, $format = null, array $context = array())
     {
-        if (!is_string($data)) {
-            throw new InvalidArgumentException(sprintf('Data expected to be a string, %s given.', gettype($data)));
+        if (!\is_string($data)) {
+            throw new InvalidArgumentException(sprintf('Data expected to be a string, %s given.', \gettype($data)));
         }
 
         if (!$this->isISO8601($data)) {
diff --git a/src/Symfony/Component/Serializer/Normalizer/ObjectToPopulateTrait.php b/src/Symfony/Component/Serializer/Normalizer/ObjectToPopulateTrait.php
index ac647889168b..7150a6e6ee38 100644
--- a/src/Symfony/Component/Serializer/Normalizer/ObjectToPopulateTrait.php
+++ b/src/Symfony/Component/Serializer/Normalizer/ObjectToPopulateTrait.php
@@ -28,7 +28,7 @@ protected function extractObjectToPopulate($class, array $context, $key = null)
     {
         $key = $key ?: 'object_to_populate';
 
-        if (isset($context[$key]) && is_object($context[$key]) && $context[$key] instanceof $class) {
+        if (isset($context[$key]) && \is_object($context[$key]) && $context[$key] instanceof $class) {
             return $context[$key];
         }
 
diff --git a/src/Symfony/Component/Serializer/Serializer.php b/src/Symfony/Component/Serializer/Serializer.php
index 1a7087042567..07373fa84fb0 100644
--- a/src/Symfony/Component/Serializer/Serializer.php
+++ b/src/Symfony/Component/Serializer/Serializer.php
@@ -15,17 +15,17 @@
 use Symfony\Component\Serializer\Encoder\ChainEncoder;
 use Symfony\Component\Serializer\Encoder\ContextAwareDecoderInterface;
 use Symfony\Component\Serializer\Encoder\ContextAwareEncoderInterface;
-use Symfony\Component\Serializer\Encoder\EncoderInterface;
 use Symfony\Component\Serializer\Encoder\DecoderInterface;
+use Symfony\Component\Serializer\Encoder\EncoderInterface;
+use Symfony\Component\Serializer\Exception\LogicException;
 use Symfony\Component\Serializer\Exception\NotEncodableValueException;
 use Symfony\Component\Serializer\Exception\NotNormalizableValueException;
 use Symfony\Component\Serializer\Normalizer\ContextAwareDenormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\ContextAwareNormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerAwareInterface;
+use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerAwareInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
-use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
-use Symfony\Component\Serializer\Exception\LogicException;
 
 /**
  * Serializer serializes and deserializes data.
diff --git a/src/Symfony/Component/Serializer/Tests/Encoder/JsonEncoderTest.php b/src/Symfony/Component/Serializer/Tests/Encoder/JsonEncoderTest.php
index b08b6d5b50c1..1977d4f19ce8 100644
--- a/src/Symfony/Component/Serializer/Tests/Encoder/JsonEncoderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Encoder/JsonEncoderTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Serializer\Encoder\JsonEncoder;
-use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\Normalizer\CustomNormalizer;
+use Symfony\Component\Serializer\Serializer;
 
 class JsonEncoderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Encoder/XmlEncoderTest.php b/src/Symfony/Component/Serializer/Tests/Encoder/XmlEncoderTest.php
index e8178ad0c4c8..e9b748e292b7 100644
--- a/src/Symfony/Component/Serializer/Tests/Encoder/XmlEncoderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Encoder/XmlEncoderTest.php
@@ -12,13 +12,13 @@
 namespace Symfony\Component\Serializer\Tests\Encoder;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
-use Symfony\Component\Serializer\Tests\Fixtures\NormalizableTraversableDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\ScalarDummy;
 use Symfony\Component\Serializer\Encoder\XmlEncoder;
-use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\Normalizer\CustomNormalizer;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+use Symfony\Component\Serializer\Serializer;
+use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
+use Symfony\Component\Serializer\Tests\Fixtures\NormalizableTraversableDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\ScalarDummy;
 
 class XmlEncoderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Dummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Dummy.php
index 6b33e8437440..3f4582559e7a 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/Dummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Dummy.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Serializer\Tests\Fixtures;
 
-use Symfony\Component\Serializer\Normalizer\NormalizableInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizableInterface;
-use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\NormalizableInterface;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 
 class Dummy implements NormalizableInterface, DenormalizableInterface
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/NormalizableTraversableDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/NormalizableTraversableDummy.php
index 3ac2fe364f9a..a786fa1cc192 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/NormalizableTraversableDummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/NormalizableTraversableDummy.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Serializer\Tests\Fixtures;
 
-use Symfony\Component\Serializer\Normalizer\NormalizableInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizableInterface;
-use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\NormalizableInterface;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 
 class NormalizableTraversableDummy extends TraversableDummy implements NormalizableInterface, DenormalizableInterface
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/ScalarDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/ScalarDummy.php
index 598e76fda8bf..fb45e12c650a 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/ScalarDummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/ScalarDummy.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Serializer\Tests\Fixtures;
 
-use Symfony\Component\Serializer\Normalizer\NormalizableInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizableInterface;
-use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\NormalizableInterface;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 
 class ScalarDummy implements NormalizableInterface, DenormalizableInterface
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CacheMetadataFactoryTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CacheMetadataFactoryTest.php
index dc392581c5b8..cac4367ca799 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CacheMetadataFactoryTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CacheMetadataFactoryTest.php
@@ -14,8 +14,8 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Cache\Adapter\ArrayAdapter;
 use Symfony\Component\Serializer\Mapping\ClassMetadata;
-use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
 use Symfony\Component\Serializer\Mapping\Factory\CacheClassMetadataFactory;
+use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
 
 /**
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
index 974d42ee5592..264f37fc42d9 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Serializer\Tests\Mapping\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader;
 use Symfony\Component\Serializer\Mapping\ClassMetadata;
+use Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader;
 use Symfony\Component\Serializer\Tests\Mapping\TestClassMetadataFactory;
 
 /**
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/YamlFileLoaderTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/YamlFileLoaderTest.php
index 918af73b14d8..1bf5586baffa 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/YamlFileLoaderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/YamlFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Serializer\Tests\Mapping\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader;
 use Symfony\Component\Serializer\Mapping\ClassMetadata;
+use Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader;
 use Symfony\Component\Serializer\Tests\Mapping\TestClassMetadataFactory;
 
 /**
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
index 7aa6a76a7d0f..851ed7f9bbb8 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
@@ -19,8 +19,8 @@
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
 use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
 use Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer;
-use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\SerializerAwareInterface;
 use Symfony\Component\Serializer\SerializerInterface;
 
@@ -180,7 +180,7 @@ protected function setAttributeValue($object, $attribute, $value, $format = null
 
     protected function isAllowedAttribute($classOrObject, $attribute, $format = null, array $context = array())
     {
-        return in_array($attribute, array('foo', 'baz'));
+        return \in_array($attribute, array('foo', 'baz'));
     }
 
     public function instantiateObject(array &$data, $class, array &$context, \ReflectionClass $reflectionClass, $allowedAttributes, string $format = null)
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/CustomNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/CustomNormalizerTest.php
index e5d0d445707e..55378c773a55 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/CustomNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/CustomNormalizerTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Serializer\Tests\Normalizer;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Serializer\Tests\Fixtures\ScalarDummy;
 use Symfony\Component\Serializer\Normalizer\CustomNormalizer;
 use Symfony\Component\Serializer\Serializer;
+use Symfony\Component\Serializer\Tests\Fixtures\ScalarDummy;
 
 class CustomNormalizerTest extends TestCase
 {
@@ -47,11 +47,11 @@ public function testSerialize()
 
     public function testDeserialize()
     {
-        $obj = $this->normalizer->denormalize('foo', get_class(new ScalarDummy()), 'xml');
+        $obj = $this->normalizer->denormalize('foo', \get_class(new ScalarDummy()), 'xml');
         $this->assertEquals('foo', $obj->xmlFoo);
         $this->assertNull($obj->foo);
 
-        $obj = $this->normalizer->denormalize('foo', get_class(new ScalarDummy()), 'json');
+        $obj = $this->normalizer->denormalize('foo', \get_class(new ScalarDummy()), 'json');
         $this->assertEquals('foo', $obj->foo);
         $this->assertNull($obj->xmlFoo);
     }
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php
index 16b04fb5d608..8940f70a4f4f 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php
@@ -13,17 +13,17 @@
 
 use Doctrine\Common\Annotations\AnnotationReader;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
+use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
 use Symfony\Component\Serializer\NameConverter\CamelCaseToSnakeCaseNameConverter;
 use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\SerializerInterface;
-use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\CircularReferenceDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\SiblingHolder;
-use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
-use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
-use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
 
 class GetSetMethodNormalizerTest extends TestCase
 {
@@ -373,7 +373,7 @@ public function provideCallbacks()
             array(
                 array(
                     'bar' => function ($bars) {
-                        return count($bars);
+                        return \count($bars);
                     },
                 ),
                 array(new GetConstructorDummy('baz', '', false), new GetConstructorDummy('quux', '', false)),
@@ -433,7 +433,7 @@ public function testCircularReferenceHandler()
         $serializer = new Serializer(array($this->normalizer));
         $this->normalizer->setSerializer($serializer);
         $this->normalizer->setCircularReferenceHandler(function ($obj) {
-            return get_class($obj);
+            return \get_class($obj);
         });
 
         $obj = new CircularReferenceDummy();
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
index f2d389a0df07..0a855d22be72 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
@@ -16,19 +16,19 @@
 use Symfony\Component\PropertyInfo\Extractor\PhpDocExtractor;
 use Symfony\Component\PropertyInfo\Extractor\ReflectionExtractor;
 use Symfony\Component\PropertyInfo\PropertyInfoExtractor;
+use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
+use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
 use Symfony\Component\Serializer\NameConverter\CamelCaseToSnakeCaseNameConverter;
 use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
 use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\SerializerInterface;
-use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\CircularReferenceDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\SiblingHolder;
-use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
-use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
-use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
 
 /**
  * @author Kévin Dunglas <dunglas@gmail.com>
@@ -422,7 +422,7 @@ public function provideCallbacks()
             array(
                 array(
                     'bar' => function ($bars) {
-                        return count($bars);
+                        return \count($bars);
                     },
                 ),
                 array(new ObjectConstructorDummy('baz', '', false), new ObjectConstructorDummy('quux', '', false)),
@@ -482,7 +482,7 @@ public function testCircularReferenceHandler()
         $serializer = new Serializer(array($this->normalizer));
         $this->normalizer->setSerializer($serializer);
         $this->normalizer->setCircularReferenceHandler(function ($obj) {
-            return get_class($obj);
+            return \get_class($obj);
         });
 
         $obj = new CircularReferenceDummy();
@@ -985,11 +985,11 @@ class FormatAndContextAwareNormalizer extends ObjectNormalizer
 {
     protected function isAllowedAttribute($classOrObject, $attribute, $format = null, array $context = array())
     {
-        if (in_array($attribute, array('foo', 'bar')) && 'foo_and_bar_included' === $format) {
+        if (\in_array($attribute, array('foo', 'bar')) && 'foo_and_bar_included' === $format) {
             return true;
         }
 
-        if (in_array($attribute, array('foo', 'bar')) && isset($context['include_foo_and_bar']) && true === $context['include_foo_and_bar']) {
+        if (\in_array($attribute, array('foo', 'bar')) && isset($context['include_foo_and_bar']) && true === $context['include_foo_and_bar']) {
             return true;
         }
 
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/PropertyNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/PropertyNormalizerTest.php
index 29c2127a2797..26273b3a5b85 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/PropertyNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/PropertyNormalizerTest.php
@@ -311,7 +311,7 @@ public function provideCallbacks()
             array(
                 array(
                     'bar' => function ($bars) {
-                        return count($bars);
+                        return \count($bars);
                     },
                 ),
                 array(new PropertyConstructorDummy('baz', ''), new PropertyConstructorDummy('quux', '')),
@@ -355,7 +355,7 @@ public function testCircularReferenceHandler()
         $serializer = new Serializer(array($this->normalizer));
         $this->normalizer->setSerializer($serializer);
         $this->normalizer->setCircularReferenceHandler(function ($obj) {
-            return get_class($obj);
+            return \get_class($obj);
         });
 
         $obj = new PropertyCircularReferenceDummy();
diff --git a/src/Symfony/Component/Serializer/Tests/SerializerTest.php b/src/Symfony/Component/Serializer/Tests/SerializerTest.php
index f7f8594cb12b..e320bee3a6da 100644
--- a/src/Symfony/Component/Serializer/Tests/SerializerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/SerializerTest.php
@@ -12,21 +12,21 @@
 namespace Symfony\Component\Serializer\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Serializer\Encoder\JsonEncoder;
 use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
+use Symfony\Component\Serializer\Normalizer\CustomNormalizer;
 use Symfony\Component\Serializer\Normalizer\DenormalizerAwareInterface;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
+use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
 use Symfony\Component\Serializer\Normalizer\NormalizerAwareInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\Normalizer\PropertyNormalizer;
 use Symfony\Component\Serializer\Serializer;
-use Symfony\Component\Serializer\Encoder\JsonEncoder;
-use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
-use Symfony\Component\Serializer\Normalizer\CustomNormalizer;
-use Symfony\Component\Serializer\Tests\Fixtures\TraversableDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\NormalizableTraversableDummy;
-use Symfony\Component\Serializer\Tests\Normalizer\TestNormalizer;
+use Symfony\Component\Serializer\Tests\Fixtures\TraversableDummy;
 use Symfony\Component\Serializer\Tests\Normalizer\TestDenormalizer;
+use Symfony\Component\Serializer\Tests\Normalizer\TestNormalizer;
 
 class SerializerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Stopwatch/Stopwatch.php b/src/Symfony/Component/Stopwatch/Stopwatch.php
index fe1645fc544e..9f5a95fa0fdf 100644
--- a/src/Symfony/Component/Stopwatch/Stopwatch.php
+++ b/src/Symfony/Component/Stopwatch/Stopwatch.php
@@ -85,7 +85,7 @@ public function stopSection($id)
     {
         $this->stop('__section__');
 
-        if (1 == count($this->activeSections)) {
+        if (1 == \count($this->activeSections)) {
             throw new \LogicException('There is no started section to stop.');
         }
 
diff --git a/src/Symfony/Component/Stopwatch/StopwatchEvent.php b/src/Symfony/Component/Stopwatch/StopwatchEvent.php
index de1259a9f17a..99ed6de282a1 100644
--- a/src/Symfony/Component/Stopwatch/StopwatchEvent.php
+++ b/src/Symfony/Component/Stopwatch/StopwatchEvent.php
@@ -53,7 +53,7 @@ class StopwatchEvent
     public function __construct(float $origin, string $category = null, bool $morePrecision = false)
     {
         $this->origin = $this->formatTime($origin);
-        $this->category = is_string($category) ? $category : 'default';
+        $this->category = \is_string($category) ? $category : 'default';
         $this->morePrecision = $morePrecision;
     }
 
@@ -98,7 +98,7 @@ public function start()
      */
     public function stop()
     {
-        if (!count($this->started)) {
+        if (!\count($this->started)) {
             throw new \LogicException('stop() called but start() has not been called before.');
         }
 
@@ -132,7 +132,7 @@ public function lap()
      */
     public function ensureStopped()
     {
-        while (count($this->started)) {
+        while (\count($this->started)) {
             $this->stop();
         }
     }
@@ -164,7 +164,7 @@ public function getStartTime()
      */
     public function getEndTime()
     {
-        $count = count($this->periods);
+        $count = \count($this->periods);
 
         return $count ? $this->periods[$count - 1]->getEndTime() : 0;
     }
@@ -177,8 +177,8 @@ public function getEndTime()
     public function getDuration()
     {
         $periods = $this->periods;
-        $stopped = count($periods);
-        $left = count($this->started) - $stopped;
+        $stopped = \count($periods);
+        $left = \count($this->started) - $stopped;
 
         for ($i = 0; $i < $left; ++$i) {
             $index = $stopped + $i;
diff --git a/src/Symfony/Component/Stopwatch/Tests/StopwatchEventTest.php b/src/Symfony/Component/Stopwatch/Tests/StopwatchEventTest.php
index c1f64f9bfd82..ea991d8af88d 100644
--- a/src/Symfony/Component/Stopwatch/Tests/StopwatchEventTest.php
+++ b/src/Symfony/Component/Stopwatch/Tests/StopwatchEventTest.php
@@ -73,7 +73,7 @@ public function testDuration()
         $event->start();
         usleep(200000);
         $event->stop();
-        $this->assertEquals(200, $event->getDuration(), null, self::DELTA);
+        $this->assertEquals(200, $event->getDuration(), '', self::DELTA);
 
         $event = new StopwatchEvent(microtime(true) * 1000);
         $event->start();
@@ -83,7 +83,7 @@ public function testDuration()
         $event->start();
         usleep(100000);
         $event->stop();
-        $this->assertEquals(200, $event->getDuration(), null, self::DELTA);
+        $this->assertEquals(200, $event->getDuration(), '', self::DELTA);
     }
 
     public function testDurationBeforeStop()
@@ -91,7 +91,7 @@ public function testDurationBeforeStop()
         $event = new StopwatchEvent(microtime(true) * 1000);
         $event->start();
         usleep(200000);
-        $this->assertEquals(200, $event->getDuration(), null, self::DELTA);
+        $this->assertEquals(200, $event->getDuration(), '', self::DELTA);
 
         $event = new StopwatchEvent(microtime(true) * 1000);
         $event->start();
@@ -100,7 +100,7 @@ public function testDurationBeforeStop()
         usleep(50000);
         $event->start();
         usleep(100000);
-        $this->assertEquals(100, $event->getDuration(), null, self::DELTA);
+        $this->assertEquals(100, $event->getDuration(), '', self::DELTA);
     }
 
     /**
@@ -134,7 +134,7 @@ public function testEnsureStopped()
         $event->start();
         usleep(100000);
         $event->ensureStopped();
-        $this->assertEquals(300, $event->getDuration(), null, self::DELTA);
+        $this->assertEquals(300, $event->getDuration(), '', self::DELTA);
     }
 
     public function testStartTime()
@@ -151,7 +151,7 @@ public function testStartTime()
         $event->start();
         usleep(100000);
         $event->stop();
-        $this->assertEquals(0, $event->getStartTime(), null, self::DELTA);
+        $this->assertEquals(0, $event->getStartTime(), '', self::DELTA);
     }
 
     public function testHumanRepresentation()
diff --git a/src/Symfony/Component/Stopwatch/Tests/StopwatchTest.php b/src/Symfony/Component/Stopwatch/Tests/StopwatchTest.php
index a63b54d6a250..10e6a14af62d 100644
--- a/src/Symfony/Component/Stopwatch/Tests/StopwatchTest.php
+++ b/src/Symfony/Component/Stopwatch/Tests/StopwatchTest.php
@@ -79,7 +79,7 @@ public function testStop()
         $event = $stopwatch->stop('foo');
 
         $this->assertInstanceOf('Symfony\Component\Stopwatch\StopwatchEvent', $event);
-        $this->assertEquals(200, $event->getDuration(), null, self::DELTA);
+        $this->assertEquals(200, $event->getDuration(), '', self::DELTA);
     }
 
     /**
diff --git a/src/Symfony/Component/Templating/Helper/SlotsHelper.php b/src/Symfony/Component/Templating/Helper/SlotsHelper.php
index 8fa5ff5ff2a7..e5faf7fe8871 100644
--- a/src/Symfony/Component/Templating/Helper/SlotsHelper.php
+++ b/src/Symfony/Component/Templating/Helper/SlotsHelper.php
@@ -33,7 +33,7 @@ class SlotsHelper extends Helper
      */
     public function start($name)
     {
-        if (in_array($name, $this->openSlots)) {
+        if (\in_array($name, $this->openSlots)) {
             throw new \InvalidArgumentException(sprintf('A slot named "%s" is already started.', $name));
         }
 
diff --git a/src/Symfony/Component/Templating/Loader/CacheLoader.php b/src/Symfony/Component/Templating/Loader/CacheLoader.php
index 51f3024082a2..215b7dcd9d7f 100644
--- a/src/Symfony/Component/Templating/Loader/CacheLoader.php
+++ b/src/Symfony/Component/Templating/Loader/CacheLoader.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Templating\Loader;
 
-use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\Storage\FileStorage;
+use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
 /**
@@ -47,9 +47,9 @@ public function __construct(LoaderInterface $loader, string $dir)
     public function load(TemplateReferenceInterface $template)
     {
         $key = hash('sha256', $template->getLogicalName());
-        $dir = $this->dir.DIRECTORY_SEPARATOR.substr($key, 0, 2);
+        $dir = $this->dir.\DIRECTORY_SEPARATOR.substr($key, 0, 2);
         $file = substr($key, 2).'.tpl';
-        $path = $dir.DIRECTORY_SEPARATOR.$file;
+        $path = $dir.\DIRECTORY_SEPARATOR.$file;
 
         if (is_file($path)) {
             if (null !== $this->logger) {
diff --git a/src/Symfony/Component/Templating/Loader/FilesystemLoader.php b/src/Symfony/Component/Templating/Loader/FilesystemLoader.php
index 7bb483ad6bbe..919c96fb200c 100644
--- a/src/Symfony/Component/Templating/Loader/FilesystemLoader.php
+++ b/src/Symfony/Component/Templating/Loader/FilesystemLoader.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Templating\Loader;
 
-use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\Storage\FileStorage;
+use Symfony\Component\Templating\Storage\Storage;
 use Symfony\Component\Templating\TemplateReferenceInterface;
 
 /**
@@ -102,7 +102,7 @@ public function isFresh(TemplateReferenceInterface $template, $time)
     protected static function isAbsolutePath($file)
     {
         if ('/' == $file[0] || '\\' == $file[0]
-            || (strlen($file) > 3 && ctype_alpha($file[0])
+            || (\strlen($file) > 3 && ctype_alpha($file[0])
                 && ':' == $file[1]
                 && ('\\' == $file[2] || '/' == $file[2])
             )
diff --git a/src/Symfony/Component/Templating/Loader/LoaderInterface.php b/src/Symfony/Component/Templating/Loader/LoaderInterface.php
index d2897e5c2034..0deb231bc063 100644
--- a/src/Symfony/Component/Templating/Loader/LoaderInterface.php
+++ b/src/Symfony/Component/Templating/Loader/LoaderInterface.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Templating\Loader;
 
-use Symfony\Component\Templating\TemplateReferenceInterface;
 use Symfony\Component\Templating\Storage\Storage;
+use Symfony\Component\Templating\TemplateReferenceInterface;
 
 /**
  * LoaderInterface is the interface all loaders must implement.
diff --git a/src/Symfony/Component/Templating/PhpEngine.php b/src/Symfony/Component/Templating/PhpEngine.php
index ff1897ba3879..c58bdff94852 100644
--- a/src/Symfony/Component/Templating/PhpEngine.php
+++ b/src/Symfony/Component/Templating/PhpEngine.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Templating;
 
-use Symfony\Component\Templating\Storage\Storage;
-use Symfony\Component\Templating\Storage\FileStorage;
-use Symfony\Component\Templating\Storage\StringStorage;
 use Symfony\Component\Templating\Helper\HelperInterface;
 use Symfony\Component\Templating\Loader\LoaderInterface;
+use Symfony\Component\Templating\Storage\FileStorage;
+use Symfony\Component\Templating\Storage\Storage;
+use Symfony\Component\Templating\Storage\StringStorage;
 
 /**
  * PhpEngine is an engine able to render PHP templates.
@@ -224,7 +224,7 @@ public function offsetUnset($name)
     public function addHelpers(array $helpers)
     {
         foreach ($helpers as $alias => $helper) {
-            $this->set($helper, is_int($alias) ? null : $alias);
+            $this->set($helper, \is_int($alias) ? null : $alias);
         }
     }
 
@@ -313,13 +313,13 @@ public function escape($value, $context = 'html')
         // the performance when the same value is escaped multiple times (e.g. loops)
         if (is_scalar($value)) {
             if (!isset(self::$escaperCache[$context][$value])) {
-                self::$escaperCache[$context][$value] = call_user_func($this->getEscaper($context), $value);
+                self::$escaperCache[$context][$value] = \call_user_func($this->getEscaper($context), $value);
             }
 
             return self::$escaperCache[$context][$value];
         }
 
-        return call_user_func($this->getEscaper($context), $value);
+        return \call_user_func($this->getEscaper($context), $value);
     }
 
     /**
@@ -431,7 +431,7 @@ protected function initializeEscapers()
                 function ($value) use ($flags) {
                     // Numbers and Boolean values get turned into strings which can cause problems
                     // with type comparisons (e.g. === or is_int() etc).
-                    return is_string($value) ? htmlspecialchars($value, $flags, $this->getCharset(), false) : $value;
+                    return \is_string($value) ? htmlspecialchars($value, $flags, $this->getCharset(), false) : $value;
                 },
 
             'js' =>
diff --git a/src/Symfony/Component/Templating/Tests/DelegatingEngineTest.php b/src/Symfony/Component/Templating/Tests/DelegatingEngineTest.php
index 19db0caef77c..cadd9edf0b54 100644
--- a/src/Symfony/Component/Templating/Tests/DelegatingEngineTest.php
+++ b/src/Symfony/Component/Templating/Tests/DelegatingEngineTest.php
@@ -13,8 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Templating\DelegatingEngine;
-use Symfony\Component\Templating\StreamingEngineInterface;
 use Symfony\Component\Templating\EngineInterface;
+use Symfony\Component\Templating\StreamingEngineInterface;
 
 class DelegatingEngineTest extends TestCase
 {
diff --git a/src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php b/src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php
index c889d21817a6..dbc89bc6d1fb 100644
--- a/src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php
+++ b/src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Templating\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Templating\Loader\Loader;
 use Symfony\Component\Templating\Loader\CacheLoader;
+use Symfony\Component\Templating\Loader\Loader;
 use Symfony\Component\Templating\Storage\StringStorage;
-use Symfony\Component\Templating\TemplateReferenceInterface;
 use Symfony\Component\Templating\TemplateReference;
+use Symfony\Component\Templating\TemplateReferenceInterface;
 
 class CacheLoaderTest extends TestCase
 {
@@ -29,7 +29,7 @@ public function testConstructor()
 
     public function testLoad()
     {
-        $dir = sys_get_temp_dir().DIRECTORY_SEPARATOR.mt_rand(111111, 999999);
+        $dir = sys_get_temp_dir().\DIRECTORY_SEPARATOR.mt_rand(111111, 999999);
         mkdir($dir, 0777, true);
 
         $loader = new ProjectTemplateLoader($varLoader = new ProjectTemplateLoaderVar(), $dir);
diff --git a/src/Symfony/Component/Templating/Tests/PhpEngineTest.php b/src/Symfony/Component/Templating/Tests/PhpEngineTest.php
index 8889ae12ac23..f677c3028d03 100644
--- a/src/Symfony/Component/Templating/Tests/PhpEngineTest.php
+++ b/src/Symfony/Component/Templating/Tests/PhpEngineTest.php
@@ -12,13 +12,13 @@
 namespace Symfony\Component\Templating\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Templating\PhpEngine;
+use Symfony\Component\Templating\Helper\SlotsHelper;
 use Symfony\Component\Templating\Loader\Loader;
+use Symfony\Component\Templating\PhpEngine;
 use Symfony\Component\Templating\Storage\StringStorage;
-use Symfony\Component\Templating\Helper\SlotsHelper;
 use Symfony\Component\Templating\TemplateNameParser;
-use Symfony\Component\Templating\TemplateReferenceInterface;
 use Symfony\Component\Templating\TemplateReference;
+use Symfony\Component\Templating\TemplateReferenceInterface;
 
 class PhpEngineTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Catalogue/AbstractOperation.php b/src/Symfony/Component/Translation/Catalogue/AbstractOperation.php
index 022bad48f852..c303a4f6e491 100644
--- a/src/Symfony/Component/Translation/Catalogue/AbstractOperation.php
+++ b/src/Symfony/Component/Translation/Catalogue/AbstractOperation.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Translation\Catalogue;
 
-use Symfony\Component\Translation\MessageCatalogue;
-use Symfony\Component\Translation\MessageCatalogueInterface;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
 use Symfony\Component\Translation\Exception\LogicException;
+use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Translation\MessageCatalogueInterface;
 
 /**
  * Base catalogues binary operation class.
@@ -91,7 +91,7 @@ public function getDomains()
      */
     public function getMessages($domain)
     {
-        if (!in_array($domain, $this->getDomains())) {
+        if (!\in_array($domain, $this->getDomains())) {
             throw new InvalidArgumentException(sprintf('Invalid domain: %s.', $domain));
         }
 
@@ -107,7 +107,7 @@ public function getMessages($domain)
      */
     public function getNewMessages($domain)
     {
-        if (!in_array($domain, $this->getDomains())) {
+        if (!\in_array($domain, $this->getDomains())) {
             throw new InvalidArgumentException(sprintf('Invalid domain: %s.', $domain));
         }
 
@@ -123,7 +123,7 @@ public function getNewMessages($domain)
      */
     public function getObsoleteMessages($domain)
     {
-        if (!in_array($domain, $this->getDomains())) {
+        if (!\in_array($domain, $this->getDomains())) {
             throw new InvalidArgumentException(sprintf('Invalid domain: %s.', $domain));
         }
 
diff --git a/src/Symfony/Component/Translation/Command/XliffLintCommand.php b/src/Symfony/Component/Translation/Command/XliffLintCommand.php
index 1d310371a3c0..9720ced0ac14 100644
--- a/src/Symfony/Component/Translation/Command/XliffLintCommand.php
+++ b/src/Symfony/Component/Translation/Command/XliffLintCommand.php
@@ -143,7 +143,7 @@ private function display(SymfonyStyle $io, array $files)
 
     private function displayTxt(SymfonyStyle $io, array $filesInfo)
     {
-        $countFiles = count($filesInfo);
+        $countFiles = \count($filesInfo);
         $erroredFiles = 0;
 
         foreach ($filesInfo as $info) {
@@ -193,7 +193,7 @@ private function getFiles($fileOrDirectory)
         }
 
         foreach ($this->getDirectoryIterator($fileOrDirectory) as $file) {
-            if (!in_array($file->getExtension(), array('xlf', 'xliff'))) {
+            if (!\in_array($file->getExtension(), array('xlf', 'xliff'))) {
                 continue;
             }
 
@@ -225,7 +225,7 @@ private function getDirectoryIterator($directory)
         };
 
         if (null !== $this->directoryIteratorProvider) {
-            return call_user_func($this->directoryIteratorProvider, $directory, $default);
+            return \call_user_func($this->directoryIteratorProvider, $directory, $default);
         }
 
         return $default($directory);
@@ -238,7 +238,7 @@ private function isReadable($fileOrDirectory)
         };
 
         if (null !== $this->isReadableProvider) {
-            return call_user_func($this->isReadableProvider, $fileOrDirectory, $default);
+            return \call_user_func($this->isReadableProvider, $fileOrDirectory, $default);
         }
 
         return $default($fileOrDirectory);
diff --git a/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php b/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
index 5d97a6700611..edd712dd1457 100644
--- a/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
+++ b/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
@@ -99,7 +99,7 @@ public function getLocale()
 
     public function getFallbackLocales()
     {
-        return (isset($this->data['fallback_locales']) && count($this->data['fallback_locales']) > 0) ? $this->data['fallback_locales'] : array();
+        return (isset($this->data['fallback_locales']) && \count($this->data['fallback_locales']) > 0) ? $this->data['fallback_locales'] : array();
     }
 
     /**
@@ -158,7 +158,7 @@ private function sanitizeString($string, $length = 80)
             if (mb_strlen($string, $encoding) > $length) {
                 return mb_substr($string, 0, $length - 3, $encoding).'...';
             }
-        } elseif (strlen($string) > $length) {
+        } elseif (\strlen($string) > $length) {
             return substr($string, 0, $length - 3).'...';
         }
 
diff --git a/src/Symfony/Component/Translation/DataCollectorTranslator.php b/src/Symfony/Component/Translation/DataCollectorTranslator.php
index 715c390f531d..5d4d819e0ad9 100644
--- a/src/Symfony/Component/Translation/DataCollectorTranslator.php
+++ b/src/Symfony/Component/Translation/DataCollectorTranslator.php
@@ -35,7 +35,7 @@ class DataCollectorTranslator implements TranslatorInterface, TranslatorBagInter
     public function __construct(TranslatorInterface $translator)
     {
         if (!$translator instanceof TranslatorBagInterface) {
-            throw new InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface and TranslatorBagInterface.', get_class($translator)));
+            throw new InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface and TranslatorBagInterface.', \get_class($translator)));
         }
 
         $this->translator = $translator;
@@ -106,7 +106,7 @@ public function getFallbackLocales()
      */
     public function __call($method, $args)
     {
-        return call_user_func_array(array($this->translator, $method), $args);
+        return \call_user_func_array(array($this->translator, $method), $args);
     }
 
     /**
diff --git a/src/Symfony/Component/Translation/DependencyInjection/TranslationDumperPass.php b/src/Symfony/Component/Translation/DependencyInjection/TranslationDumperPass.php
index e620226e8326..31d791dc262d 100644
--- a/src/Symfony/Component/Translation/DependencyInjection/TranslationDumperPass.php
+++ b/src/Symfony/Component/Translation/DependencyInjection/TranslationDumperPass.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Translation\DependencyInjection;
 
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Adds tagged translation.formatter services to translation writer.
diff --git a/src/Symfony/Component/Translation/DependencyInjection/TranslationExtractorPass.php b/src/Symfony/Component/Translation/DependencyInjection/TranslationExtractorPass.php
index 18c67f68ec2a..b7e6f7345871 100644
--- a/src/Symfony/Component/Translation/DependencyInjection/TranslationExtractorPass.php
+++ b/src/Symfony/Component/Translation/DependencyInjection/TranslationExtractorPass.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Translation\DependencyInjection;
 
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Adds tagged translation.extractor services to translation extractor.
diff --git a/src/Symfony/Component/Translation/DependencyInjection/TranslatorPass.php b/src/Symfony/Component/Translation/DependencyInjection/TranslatorPass.php
index 1f7839dbff35..cbaa43db96ee 100644
--- a/src/Symfony/Component/Translation/DependencyInjection/TranslatorPass.php
+++ b/src/Symfony/Component/Translation/DependencyInjection/TranslatorPass.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Translation\DependencyInjection;
 
-use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
 
 class TranslatorPass implements CompilerPassInterface
 {
diff --git a/src/Symfony/Component/Translation/Dumper/FileDumper.php b/src/Symfony/Component/Translation/Dumper/FileDumper.php
index 2e047ed7c0e4..395c9ff7eaee 100644
--- a/src/Symfony/Component/Translation/Dumper/FileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/FileDumper.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Translation\Dumper;
 
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
 use Symfony\Component\Translation\Exception\RuntimeException;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * FileDumper is an implementation of DumperInterface that dump a message catalogue to file(s).
@@ -70,7 +70,7 @@ public function dump(MessageCatalogue $messages, $options = array())
         foreach ($messages->getDomains() as $domain) {
             $fullpath = $options['path'].'/'.$this->getRelativePath($domain, $messages->getLocale());
             if (!file_exists($fullpath)) {
-                $directory = dirname($fullpath);
+                $directory = \dirname($fullpath);
                 if (!file_exists($directory) && !@mkdir($directory, 0777, true)) {
                     throw new RuntimeException(sprintf('Unable to create directory "%s".', $directory));
                 }
diff --git a/src/Symfony/Component/Translation/Dumper/IcuResFileDumper.php b/src/Symfony/Component/Translation/Dumper/IcuResFileDumper.php
index 42f159501a85..efa9d7fee6be 100644
--- a/src/Symfony/Component/Translation/Dumper/IcuResFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/IcuResFileDumper.php
@@ -33,7 +33,7 @@ public function formatCatalogue(MessageCatalogue $messages, $domain, array $opti
         $data = $indexes = $resources = '';
 
         foreach ($messages->all($domain) as $source => $target) {
-            $indexes .= pack('v', strlen($data) + 28);
+            $indexes .= pack('v', \strlen($data) + 28);
             $data .= $source."\0";
         }
 
@@ -44,7 +44,7 @@ public function formatCatalogue(MessageCatalogue $messages, $domain, array $opti
         foreach ($messages->all($domain) as $source => $target) {
             $resources .= pack('V', $this->getPosition($data));
 
-            $data .= pack('V', strlen($target))
+            $data .= pack('V', \strlen($target))
                 .mb_convert_encoding($target."\0", 'UTF-16LE', 'UTF-8')
                 .$this->writePadding($data)
                   ;
@@ -52,7 +52,7 @@ public function formatCatalogue(MessageCatalogue $messages, $domain, array $opti
 
         $resOffset = $this->getPosition($data);
 
-        $data .= pack('v', count($messages->all($domain)))
+        $data .= pack('v', \count($messages->all($domain)))
             .$indexes
             .$this->writePadding($data)
             .$resources
@@ -66,7 +66,7 @@ public function formatCatalogue(MessageCatalogue $messages, $domain, array $opti
             $keyTop,                        // Index keys top
             $bundleTop,                     // Index resources top
             $bundleTop,                     // Index bundle top
-            count($messages->all($domain)), // Index max table length
+            \count($messages->all($domain)), // Index max table length
             0                               // Index attributes
         );
 
@@ -84,7 +84,7 @@ public function formatCatalogue(MessageCatalogue $messages, $domain, array $opti
 
     private function writePadding($data)
     {
-        $padding = strlen($data) % 4;
+        $padding = \strlen($data) % 4;
 
         if ($padding) {
             return str_repeat("\xAA", 4 - $padding);
@@ -93,7 +93,7 @@ private function writePadding($data)
 
     private function getPosition($data)
     {
-        return (strlen($data) + 28) / 4;
+        return (\strlen($data) + 28) / 4;
     }
 
     /**
diff --git a/src/Symfony/Component/Translation/Dumper/MoFileDumper.php b/src/Symfony/Component/Translation/Dumper/MoFileDumper.php
index 00a33d253a9a..2022a421115c 100644
--- a/src/Symfony/Component/Translation/Dumper/MoFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/MoFileDumper.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Translation\Dumper;
 
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Loader\MoFileLoader;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * MoFileDumper generates a gettext formatted string representation of a message catalogue.
@@ -47,7 +47,7 @@ public function formatCatalogue(MessageCatalogue $messages, $domain, array $opti
             'offsetHashes' => MoFileLoader::MO_HEADER_SIZE + (16 * $size),
         );
 
-        $sourcesSize = strlen($sources);
+        $sourcesSize = \strlen($sources);
         $sourcesStart = $header['offsetHashes'] + 1;
 
         foreach ($offsets as $offset) {
diff --git a/src/Symfony/Component/Translation/Dumper/XliffFileDumper.php b/src/Symfony/Component/Translation/Dumper/XliffFileDumper.php
index d7e5ecc78c12..e714463c9f0e 100644
--- a/src/Symfony/Component/Translation/Dumper/XliffFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/XliffFileDumper.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Translation\Dumper;
 
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * XliffFileDumper generates xliff files from a message catalogue.
@@ -195,6 +195,6 @@ private function dumpXliff2($defaultLocale, MessageCatalogue $messages, $domain,
      */
     private function hasMetadataArrayInfo($key, $metadata = null)
     {
-        return null !== $metadata && array_key_exists($key, $metadata) && ($metadata[$key] instanceof \Traversable || is_array($metadata[$key]));
+        return null !== $metadata && array_key_exists($key, $metadata) && ($metadata[$key] instanceof \Traversable || \is_array($metadata[$key]));
     }
 }
diff --git a/src/Symfony/Component/Translation/Dumper/YamlFileDumper.php b/src/Symfony/Component/Translation/Dumper/YamlFileDumper.php
index db9e4b3645a3..b19b9ae1fde6 100644
--- a/src/Symfony/Component/Translation/Dumper/YamlFileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/YamlFileDumper.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Translation\Dumper;
 
+use Symfony\Component\Translation\Exception\LogicException;
 use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Util\ArrayConverter;
 use Symfony\Component\Yaml\Yaml;
-use Symfony\Component\Translation\Exception\LogicException;
 
 /**
  * YamlFileDumper generates yaml files from a message catalogue.
diff --git a/src/Symfony/Component/Translation/Extractor/AbstractFileExtractor.php b/src/Symfony/Component/Translation/Extractor/AbstractFileExtractor.php
index bdfec1a9edc6..bebd6d916224 100644
--- a/src/Symfony/Component/Translation/Extractor/AbstractFileExtractor.php
+++ b/src/Symfony/Component/Translation/Extractor/AbstractFileExtractor.php
@@ -27,7 +27,7 @@ abstract class AbstractFileExtractor
      */
     protected function extractFiles($resource)
     {
-        if (is_array($resource) || $resource instanceof \Traversable) {
+        if (\is_array($resource) || $resource instanceof \Traversable) {
             $files = array();
             foreach ($resource as $file) {
                 if ($this->canBeExtracted($file)) {
diff --git a/src/Symfony/Component/Translation/Extractor/PhpExtractor.php b/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
index f364bdecd3fc..b4b32361ff9d 100644
--- a/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
+++ b/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
@@ -208,7 +208,7 @@ protected function parseTokens($tokens, MessageCatalogue $catalog)
                     } elseif (self::MESSAGE_TOKEN === $item) {
                         $message = $this->getValue($tokenIterator);
 
-                        if (count($sequence) === ($sequenceKey + 1)) {
+                        if (\count($sequence) === ($sequenceKey + 1)) {
                             break;
                         }
                     } elseif (self::METHOD_ARGUMENTS_TOKEN === $item) {
diff --git a/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php b/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
index bab4ce0c97e2..6ed39d465f07 100644
--- a/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
+++ b/src/Symfony/Component/Translation/Extractor/PhpStringTokenParser.php
@@ -113,9 +113,9 @@ private static function parseCallback($matches)
         if (isset(self::$replacements[$str])) {
             return self::$replacements[$str];
         } elseif ('x' === $str[0] || 'X' === $str[0]) {
-            return chr(hexdec($str));
+            return \chr(hexdec($str));
         } else {
-            return chr(octdec($str));
+            return \chr(octdec($str));
         }
     }
 
diff --git a/src/Symfony/Component/Translation/Loader/ArrayLoader.php b/src/Symfony/Component/Translation/Loader/ArrayLoader.php
index 9a595b7dadab..7bbfca68a4b0 100644
--- a/src/Symfony/Component/Translation/Loader/ArrayLoader.php
+++ b/src/Symfony/Component/Translation/Loader/ArrayLoader.php
@@ -52,7 +52,7 @@ private function flatten(array &$messages, array $subnode = null, $path = null)
             $subnode = &$messages;
         }
         foreach ($subnode as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 $nodePath = $path ? $path.'.'.$key : $key;
                 $this->flatten($messages, $value, $nodePath);
                 if (null === $path) {
diff --git a/src/Symfony/Component/Translation/Loader/CsvFileLoader.php b/src/Symfony/Component/Translation/Loader/CsvFileLoader.php
index e454d16922ec..8a763e725d6d 100644
--- a/src/Symfony/Component/Translation/Loader/CsvFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/CsvFileLoader.php
@@ -41,7 +41,7 @@ protected function loadResource($resource)
         $file->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
 
         foreach ($file as $data) {
-            if ('#' !== substr($data[0], 0, 1) && isset($data[1]) && 2 === count($data)) {
+            if ('#' !== substr($data[0], 0, 1) && isset($data[1]) && 2 === \count($data)) {
                 $messages[$data[0]] = $data[1];
             }
         }
diff --git a/src/Symfony/Component/Translation/Loader/FileLoader.php b/src/Symfony/Component/Translation/Loader/FileLoader.php
index 322679d24cdb..9a02f5250617 100644
--- a/src/Symfony/Component/Translation/Loader/FileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/FileLoader.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Translation\Loader;
 
+use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
-use Symfony\Component\Config\Resource\FileResource;
 
 /**
  * @author Abdellatif Ait boudad <a.aitboudad@gmail.com>
@@ -41,7 +41,7 @@ public function load($resource, $locale, $domain = 'messages')
         }
 
         // not an array
-        if (!is_array($messages)) {
+        if (!\is_array($messages)) {
             throw new InvalidResourceException(sprintf('Unable to load file "%s".', $resource));
         }
 
diff --git a/src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php b/src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php
index 822bc362072a..7bbf4c200647 100644
--- a/src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Translation\Loader;
 
-use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
-use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * IcuResFileLoader loads translations from a resource bundle.
diff --git a/src/Symfony/Component/Translation/Loader/IcuResFileLoader.php b/src/Symfony/Component/Translation/Loader/IcuResFileLoader.php
index 927cae16a9f5..28ace2977519 100644
--- a/src/Symfony/Component/Translation/Loader/IcuResFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/IcuResFileLoader.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Translation\Loader;
 
-use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Config\Resource\DirectoryResource;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
-use Symfony\Component\Config\Resource\DirectoryResource;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * IcuResFileLoader loads translations from a resource bundle.
diff --git a/src/Symfony/Component/Translation/Loader/LoaderInterface.php b/src/Symfony/Component/Translation/Loader/LoaderInterface.php
index 6b65fe380bc9..1785402d9cb2 100644
--- a/src/Symfony/Component/Translation/Loader/LoaderInterface.php
+++ b/src/Symfony/Component/Translation/Loader/LoaderInterface.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Translation\Loader;
 
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * LoaderInterface is the interface implemented by all translation loaders.
diff --git a/src/Symfony/Component/Translation/Loader/MoFileLoader.php b/src/Symfony/Component/Translation/Loader/MoFileLoader.php
index 918bf94a0a5d..a1d7c4aef5a5 100644
--- a/src/Symfony/Component/Translation/Loader/MoFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/MoFileLoader.php
@@ -111,7 +111,7 @@ protected function loadResource($resource)
             $ids = array('singular' => $singularId, 'plural' => $pluralId);
             $item = compact('ids', 'translated');
 
-            if (is_array($item['translated'])) {
+            if (\is_array($item['translated'])) {
                 $messages[$item['ids']['singular']] = stripcslashes($item['translated'][0]);
                 if (isset($item['ids']['plural'])) {
                     $plurals = array();
diff --git a/src/Symfony/Component/Translation/Loader/PoFileLoader.php b/src/Symfony/Component/Translation/Loader/PoFileLoader.php
index 7ce7d2dfffe1..066168dc71d9 100644
--- a/src/Symfony/Component/Translation/Loader/PoFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/PoFileLoader.php
@@ -78,7 +78,7 @@ protected function loadResource($resource)
 
             if ('' === $line) {
                 // Whitespace indicated current item is done
-                if (!in_array('fuzzy', $flags)) {
+                if (!\in_array('fuzzy', $flags)) {
                     $this->addMessage($messages, $item);
                 }
                 $item = $defaults;
@@ -96,7 +96,7 @@ protected function loadResource($resource)
             } elseif ('"' === $line[0]) {
                 $continues = isset($item['translated']) ? 'translated' : 'ids';
 
-                if (is_array($item[$continues])) {
+                if (\is_array($item[$continues])) {
                     end($item[$continues]);
                     $item[$continues][key($item[$continues])] .= substr($line, 1, -1);
                 } else {
@@ -110,7 +110,7 @@ protected function loadResource($resource)
             }
         }
         // save last item
-        if (!in_array('fuzzy', $flags)) {
+        if (!\in_array('fuzzy', $flags)) {
             $this->addMessage($messages, $item);
         }
         fclose($stream);
@@ -126,7 +126,7 @@ protected function loadResource($resource)
      */
     private function addMessage(array &$messages, array $item)
     {
-        if (is_array($item['translated'])) {
+        if (\is_array($item['translated'])) {
             $messages[stripcslashes($item['ids']['singular'])] = stripcslashes($item['translated'][0]);
             if (isset($item['ids']['plural'])) {
                 $plurals = $item['translated'];
diff --git a/src/Symfony/Component/Translation/Loader/QtFileLoader.php b/src/Symfony/Component/Translation/Loader/QtFileLoader.php
index 22536aa866c6..2d4a4c084fe4 100644
--- a/src/Symfony/Component/Translation/Loader/QtFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/QtFileLoader.php
@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Translation\Loader;
 
+use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\Util\XmlUtils;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
-use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * QtFileLoader loads translations from QT Translations XML files.
diff --git a/src/Symfony/Component/Translation/Loader/XliffFileLoader.php b/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
index b20d4909a3b3..9c6b8c9f4057 100644
--- a/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
@@ -11,12 +11,12 @@
 
 namespace Symfony\Component\Translation\Loader;
 
+use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\Util\XmlUtils;
-use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Translation\Exception\InvalidArgumentException;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
-use Symfony\Component\Translation\Exception\InvalidArgumentException;
-use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * XliffFileLoader loads translations from XLIFF files.
@@ -228,7 +228,7 @@ private function fixXmlLocation(string $schemaSource, string $xmlUri): string
             }
         }
 
-        $drive = '\\' === DIRECTORY_SEPARATOR ? array_shift($parts).'/' : '';
+        $drive = '\\' === \DIRECTORY_SEPARATOR ? array_shift($parts).'/' : '';
         $newPath = $locationstart.$drive.implode('/', array_map('rawurlencode', $parts));
 
         return str_replace($xmlUri, $newPath, $schemaSource);
diff --git a/src/Symfony/Component/Translation/Loader/YamlFileLoader.php b/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
index 874fa3a8943e..c74eeb41fe8a 100644
--- a/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
@@ -13,8 +13,8 @@
 
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\LogicException;
-use Symfony\Component\Yaml\Parser as YamlParser;
 use Symfony\Component\Yaml\Exception\ParseException;
+use Symfony\Component\Yaml\Parser as YamlParser;
 
 /**
  * YamlFileLoader loads translations from Yaml files.
diff --git a/src/Symfony/Component/Translation/LoggingTranslator.php b/src/Symfony/Component/Translation/LoggingTranslator.php
index 337c114330bb..01456708639a 100644
--- a/src/Symfony/Component/Translation/LoggingTranslator.php
+++ b/src/Symfony/Component/Translation/LoggingTranslator.php
@@ -33,7 +33,7 @@ class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface
     public function __construct(TranslatorInterface $translator, LoggerInterface $logger)
     {
         if (!$translator instanceof TranslatorBagInterface) {
-            throw new InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface and TranslatorBagInterface.', get_class($translator)));
+            throw new InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface and TranslatorBagInterface.', \get_class($translator)));
         }
 
         $this->translator = $translator;
@@ -105,7 +105,7 @@ public function getFallbackLocales()
      */
     public function __call($method, $args)
     {
-        return call_user_func_array(array($this->translator, $method), $args);
+        return \call_user_func_array(array($this->translator, $method), $args);
     }
 
     /**
diff --git a/src/Symfony/Component/Translation/MessageSelector.php b/src/Symfony/Component/Translation/MessageSelector.php
index 31304cd0d89e..5de171c5f4a4 100644
--- a/src/Symfony/Component/Translation/MessageSelector.php
+++ b/src/Symfony/Component/Translation/MessageSelector.php
@@ -82,7 +82,7 @@ public function choose($message, $number, $locale)
         if (!isset($standardRules[$position])) {
             // when there's exactly one rule given, and that rule is a standard
             // rule, use this rule
-            if (1 === count($parts) && isset($standardRules[0])) {
+            if (1 === \count($parts) && isset($standardRules[0])) {
                 return $standardRules[0];
             }
 
diff --git a/src/Symfony/Component/Translation/PluralizationRules.php b/src/Symfony/Component/Translation/PluralizationRules.php
index 94d9e4350c3c..3aca0ba96329 100644
--- a/src/Symfony/Component/Translation/PluralizationRules.php
+++ b/src/Symfony/Component/Translation/PluralizationRules.php
@@ -35,14 +35,14 @@ public static function get($number, $locale)
             $locale = 'xbr';
         }
 
-        if (strlen($locale) > 3) {
-            $locale = substr($locale, 0, -strlen(strrchr($locale, '_')));
+        if (\strlen($locale) > 3) {
+            $locale = substr($locale, 0, -\strlen(strrchr($locale, '_')));
         }
 
         if (isset(self::$rules[$locale])) {
-            $return = call_user_func(self::$rules[$locale], $number);
+            $return = \call_user_func(self::$rules[$locale], $number);
 
-            if (!is_int($return) || $return < 0) {
+            if (!\is_int($return) || $return < 0) {
                 return 0;
             }
 
@@ -201,8 +201,8 @@ public static function set(callable $rule, $locale)
             $locale = 'xbr';
         }
 
-        if (strlen($locale) > 3) {
-            $locale = substr($locale, 0, -strlen(strrchr($locale, '_')));
+        if (\strlen($locale) > 3) {
+            $locale = substr($locale, 0, -\strlen(strrchr($locale, '_')));
         }
 
         self::$rules[$locale] = $rule;
diff --git a/src/Symfony/Component/Translation/Reader/TranslationReader.php b/src/Symfony/Component/Translation/Reader/TranslationReader.php
index d2ad774e2879..948edec492e5 100644
--- a/src/Symfony/Component/Translation/Reader/TranslationReader.php
+++ b/src/Symfony/Component/Translation/Reader/TranslationReader.php
@@ -55,7 +55,7 @@ public function read($directory, MessageCatalogue $catalogue)
             $extension = $catalogue->getLocale().'.'.$format;
             $files = $finder->files()->name('*.'.$extension)->in($directory);
             foreach ($files as $file) {
-                $domain = substr($file->getFilename(), 0, -1 * strlen($extension) - 1);
+                $domain = substr($file->getFilename(), 0, -1 * \strlen($extension) - 1);
                 $catalogue->addCatalogue($loader->load($file->getPathname(), $catalogue->getLocale(), $domain));
             }
         }
diff --git a/src/Symfony/Component/Translation/Tests/DataCollector/TranslationDataCollectorTest.php b/src/Symfony/Component/Translation/Tests/DataCollector/TranslationDataCollectorTest.php
index 5611c877ca2e..504a69e6dd0b 100644
--- a/src/Symfony/Component/Translation/Tests/DataCollector/TranslationDataCollectorTest.php
+++ b/src/Symfony/Component/Translation/Tests/DataCollector/TranslationDataCollectorTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\DataCollector;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\DataCollectorTranslator;
 use Symfony\Component\Translation\DataCollector\TranslationDataCollector;
+use Symfony\Component\Translation\DataCollectorTranslator;
 
 class TranslationDataCollectorTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/DataCollectorTranslatorTest.php b/src/Symfony/Component/Translation/Tests/DataCollectorTranslatorTest.php
index 1b417379c87a..cc196223ccfa 100644
--- a/src/Symfony/Component/Translation/Tests/DataCollectorTranslatorTest.php
+++ b/src/Symfony/Component/Translation/Tests/DataCollectorTranslatorTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Translation\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Translator;
 use Symfony\Component\Translation\DataCollectorTranslator;
 use Symfony\Component\Translation\Loader\ArrayLoader;
+use Symfony\Component\Translation\Translator;
 
 class DataCollectorTranslatorTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/DependencyInjection/TranslationDumperPassTest.php b/src/Symfony/Component/Translation/Tests/DependencyInjection/TranslationDumperPassTest.php
index 3e02cb434edd..759bb0e97d3b 100644
--- a/src/Symfony/Component/Translation/Tests/DependencyInjection/TranslationDumperPassTest.php
+++ b/src/Symfony/Component/Translation/Tests/DependencyInjection/TranslationDumperPassTest.php
@@ -35,8 +35,8 @@ public function testProcessNoDefinitionFound()
     {
         $container = new ContainerBuilder();
 
-        $definitionsBefore = count($container->getDefinitions());
-        $aliasesBefore = count($container->getAliases());
+        $definitionsBefore = \count($container->getDefinitions());
+        $aliasesBefore = \count($container->getAliases());
 
         $translationDumperPass = new TranslationDumperPass();
         $translationDumperPass->process($container);
diff --git a/src/Symfony/Component/Translation/Tests/DependencyInjection/TranslationExtractorPassTest.php b/src/Symfony/Component/Translation/Tests/DependencyInjection/TranslationExtractorPassTest.php
index b3313e63eeb4..14d164d0ee3c 100644
--- a/src/Symfony/Component/Translation/Tests/DependencyInjection/TranslationExtractorPassTest.php
+++ b/src/Symfony/Component/Translation/Tests/DependencyInjection/TranslationExtractorPassTest.php
@@ -35,8 +35,8 @@ public function testProcessNoDefinitionFound()
     {
         $container = new ContainerBuilder();
 
-        $definitionsBefore = count($container->getDefinitions());
-        $aliasesBefore = count($container->getAliases());
+        $definitionsBefore = \count($container->getDefinitions());
+        $aliasesBefore = \count($container->getAliases());
 
         $translationDumperPass = new TranslationExtractorPass();
         $translationDumperPass->process($container);
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/CsvFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/CsvFileDumperTest.php
index 73fe922df0f8..9a7a059a4e82 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/CsvFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/CsvFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\CsvFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class CsvFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/FileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/FileDumperTest.php
index 25b8561077a6..d1524d6e53dc 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/FileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/FileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\FileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class FileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/IcuResFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/IcuResFileDumperTest.php
index 2f19d08dbba7..78d0abb6e4e1 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/IcuResFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/IcuResFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\IcuResFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class IcuResFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/IniFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/IniFileDumperTest.php
index 72bd9166fa8e..5f3c1236c7f5 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/IniFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/IniFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\IniFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class IniFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/JsonFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/JsonFileDumperTest.php
index 5e66f718d17e..b134ce4f2314 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/JsonFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/JsonFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\JsonFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class JsonFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/MoFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/MoFileDumperTest.php
index 3a2054f34988..d0519675bc40 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/MoFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/MoFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\MoFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class MoFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/PhpFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/PhpFileDumperTest.php
index c2f703542be9..22a39dd43d73 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/PhpFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/PhpFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\PhpFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class PhpFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/PoFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/PoFileDumperTest.php
index b00c5d136894..5d75247103d8 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/PoFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/PoFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\PoFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class PoFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/QtFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/QtFileDumperTest.php
index 9213bbaec1a4..8e4a6f43fcf6 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/QtFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/QtFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\QtFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class QtFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/XliffFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/XliffFileDumperTest.php
index 738d4b3b2f1e..443dccf2bcdc 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/XliffFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/XliffFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\XliffFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class XliffFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/YamlFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/YamlFileDumperTest.php
index 0541ac1072fc..a5549a2e9300 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/YamlFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/YamlFileDumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\YamlFileDumper;
+use Symfony\Component\Translation\MessageCatalogue;
 
 class YamlFileDumperTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/CsvFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/CsvFileLoaderTest.php
index 27a4456e601f..29efdef00d96 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/CsvFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/CsvFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\CsvFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\CsvFileLoader;
 
 class CsvFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/IcuDatFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/IcuDatFileLoaderTest.php
index 888fb615744e..e28db60135e4 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/IcuDatFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/IcuDatFileLoaderTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Translation\Tests\Loader;
 
-use Symfony\Component\Translation\Loader\IcuDatFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\IcuDatFileLoader;
 
 /**
  * @requires extension intl
diff --git a/src/Symfony/Component/Translation/Tests/Loader/IcuResFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/IcuResFileLoaderTest.php
index 8d9ed1991447..92d8933c8e7e 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/IcuResFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/IcuResFileLoaderTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Translation\Tests\Loader;
 
-use Symfony\Component\Translation\Loader\IcuResFileLoader;
 use Symfony\Component\Config\Resource\DirectoryResource;
+use Symfony\Component\Translation\Loader\IcuResFileLoader;
 
 /**
  * @requires extension intl
diff --git a/src/Symfony/Component/Translation/Tests/Loader/IniFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/IniFileLoaderTest.php
index dbf22d10347a..d9dcc5e8f015 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/IniFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/IniFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\IniFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\IniFileLoader;
 
 class IniFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/JsonFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/JsonFileLoaderTest.php
index 46261b666fbb..cea0aef4bb2f 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/JsonFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/JsonFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\JsonFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\JsonFileLoader;
 
 class JsonFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/LocalizedTestCase.php b/src/Symfony/Component/Translation/Tests/Loader/LocalizedTestCase.php
index a655c69d2e72..279e9fde5b66 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/LocalizedTestCase.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/LocalizedTestCase.php
@@ -17,7 +17,7 @@ abstract class LocalizedTestCase extends TestCase
 {
     protected function setUp()
     {
-        if (!extension_loaded('intl')) {
+        if (!\extension_loaded('intl')) {
             $this->markTestSkipped('Extension intl is required.');
         }
     }
diff --git a/src/Symfony/Component/Translation/Tests/Loader/MoFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/MoFileLoaderTest.php
index b9f754fcf0da..6ad3d44d2144 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/MoFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/MoFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\MoFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\MoFileLoader;
 
 class MoFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/PhpFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/PhpFileLoaderTest.php
index 9fc83e34f99a..01b7a5feab72 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/PhpFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/PhpFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\PhpFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\PhpFileLoader;
 
 class PhpFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/PoFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/PoFileLoaderTest.php
index 884dec9a65f6..4176cb7ffcc9 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/PoFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/PoFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\PoFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\PoFileLoader;
 
 class PoFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/QtFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/QtFileLoaderTest.php
index 7ee62b06cbc6..8a00fdedcf15 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/QtFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/QtFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\QtFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\QtFileLoader;
 
 class QtFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/XliffFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/XliffFileLoaderTest.php
index a8182895e07b..94406fd5f65d 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/XliffFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/XliffFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\XliffFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\XliffFileLoader;
 
 class XliffFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/Loader/YamlFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/YamlFileLoaderTest.php
index e1ba514b3f75..bb3c1a99a7dc 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/YamlFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/YamlFileLoaderTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Translation\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\YamlFileLoader;
 use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Translation\Loader\YamlFileLoader;
 
 class YamlFileLoaderTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/LoggingTranslatorTest.php b/src/Symfony/Component/Translation/Tests/LoggingTranslatorTest.php
index 891230a2ded2..022379e93483 100644
--- a/src/Symfony/Component/Translation/Tests/LoggingTranslatorTest.php
+++ b/src/Symfony/Component/Translation/Tests/LoggingTranslatorTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Translation\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Translator;
-use Symfony\Component\Translation\LoggingTranslator;
 use Symfony\Component\Translation\Loader\ArrayLoader;
+use Symfony\Component\Translation\LoggingTranslator;
+use Symfony\Component\Translation\Translator;
 
 class LoggingTranslatorTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/PluralizationRulesTest.php b/src/Symfony/Component/Translation/Tests/PluralizationRulesTest.php
index a0624e297a62..5eb6c01f5d21 100644
--- a/src/Symfony/Component/Translation/Tests/PluralizationRulesTest.php
+++ b/src/Symfony/Component/Translation/Tests/PluralizationRulesTest.php
@@ -100,9 +100,9 @@ protected function validateMatrix($nplural, $matrix, $expectSuccess = true)
         foreach ($matrix as $langCode => $data) {
             $indexes = array_flip($data);
             if ($expectSuccess) {
-                $this->assertEquals($nplural, count($indexes), "Langcode '$langCode' has '$nplural' plural forms.");
+                $this->assertEquals($nplural, \count($indexes), "Langcode '$langCode' has '$nplural' plural forms.");
             } else {
-                $this->assertNotEquals((int) $nplural, count($indexes), "Langcode '$langCode' has '$nplural' plural forms.");
+                $this->assertNotEquals((int) $nplural, \count($indexes), "Langcode '$langCode' has '$nplural' plural forms.");
             }
         }
     }
diff --git a/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php b/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
index a60690f85115..3e71ae74ec78 100644
--- a/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
+++ b/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
@@ -15,8 +15,8 @@
 use Symfony\Component\Config\Resource\SelfCheckingResourceInterface;
 use Symfony\Component\Translation\Loader\ArrayLoader;
 use Symfony\Component\Translation\Loader\LoaderInterface;
-use Symfony\Component\Translation\Translator;
 use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Translation\Translator;
 
 class TranslatorCacheTest extends TestCase
 {
diff --git a/src/Symfony/Component/Translation/Tests/TranslatorTest.php b/src/Symfony/Component/Translation/Tests/TranslatorTest.php
index d30ea587fca1..3e54839f77ee 100644
--- a/src/Symfony/Component/Translation/Tests/TranslatorTest.php
+++ b/src/Symfony/Component/Translation/Tests/TranslatorTest.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Translation\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Translator;
 use Symfony\Component\Translation\Loader\ArrayLoader;
 use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Translation\Translator;
 
 class TranslatorTest extends TestCase
 {
@@ -297,12 +297,12 @@ public function testFallbackCatalogueResources()
 
         $resources = $translator->getCatalogue('en')->getResources();
         $this->assertCount(1, $resources);
-        $this->assertContains(__DIR__.DIRECTORY_SEPARATOR.'fixtures'.DIRECTORY_SEPARATOR.'resources.yml', $resources);
+        $this->assertContains(__DIR__.\DIRECTORY_SEPARATOR.'fixtures'.\DIRECTORY_SEPARATOR.'resources.yml', $resources);
 
         $resources = $translator->getCatalogue('en_GB')->getResources();
         $this->assertCount(2, $resources);
-        $this->assertContains(__DIR__.DIRECTORY_SEPARATOR.'fixtures'.DIRECTORY_SEPARATOR.'empty.yml', $resources);
-        $this->assertContains(__DIR__.DIRECTORY_SEPARATOR.'fixtures'.DIRECTORY_SEPARATOR.'resources.yml', $resources);
+        $this->assertContains(__DIR__.\DIRECTORY_SEPARATOR.'fixtures'.\DIRECTORY_SEPARATOR.'empty.yml', $resources);
+        $this->assertContains(__DIR__.\DIRECTORY_SEPARATOR.'fixtures'.\DIRECTORY_SEPARATOR.'resources.yml', $resources);
     }
 
     /**
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index 2899db0101e1..97690410e241 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -11,17 +11,17 @@
 
 namespace Symfony\Component\Translation;
 
-use Symfony\Component\Translation\Loader\LoaderInterface;
-use Symfony\Component\Translation\Exception\NotFoundResourceException;
+use Symfony\Component\Config\ConfigCacheFactory;
+use Symfony\Component\Config\ConfigCacheFactoryInterface;
+use Symfony\Component\Config\ConfigCacheInterface;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
 use Symfony\Component\Translation\Exception\LogicException;
+use Symfony\Component\Translation\Exception\NotFoundResourceException;
 use Symfony\Component\Translation\Exception\RuntimeException;
-use Symfony\Component\Config\ConfigCacheInterface;
-use Symfony\Component\Config\ConfigCacheFactoryInterface;
-use Symfony\Component\Config\ConfigCacheFactory;
-use Symfony\Component\Translation\Formatter\MessageFormatterInterface;
 use Symfony\Component\Translation\Formatter\ChoiceMessageFormatterInterface;
 use Symfony\Component\Translation\Formatter\MessageFormatter;
+use Symfony\Component\Translation\Formatter\MessageFormatterInterface;
+use Symfony\Component\Translation\Loader\LoaderInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
@@ -125,7 +125,7 @@ public function addResource($format, $resource, $locale, $domain = null)
 
         $this->resources[$locale][] = array($format, $resource, $domain);
 
-        if (in_array($locale, $this->fallbackLocales)) {
+        if (\in_array($locale, $this->fallbackLocales)) {
             $this->catalogues = array();
         } else {
             unset($this->catalogues[$locale]);
@@ -196,7 +196,7 @@ public function trans($id, array $parameters = array(), $domain = null, $locale
     public function transChoice($id, $number, array $parameters = array(), $domain = null, $locale = null)
     {
         if (!$this->formatter instanceof ChoiceMessageFormatterInterface) {
-            throw new LogicException(sprintf('The formatter "%s" does not support plural translations.', get_class($this->formatter)));
+            throw new LogicException(sprintf('The formatter "%s" does not support plural translations.', \get_class($this->formatter)));
         }
 
         if (null === $domain) {
@@ -402,7 +402,7 @@ protected function computeFallbackLocales($locale)
         }
 
         if (false !== strrchr($locale, '_')) {
-            array_unshift($locales, substr($locale, 0, -strlen(strrchr($locale, '_'))));
+            array_unshift($locales, substr($locale, 0, -\strlen(strrchr($locale, '_'))));
         }
 
         return array_unique($locales);
diff --git a/src/Symfony/Component/Translation/Util/ArrayConverter.php b/src/Symfony/Component/Translation/Util/ArrayConverter.php
index 9c0a420a8592..b98e7ce826e4 100644
--- a/src/Symfony/Component/Translation/Util/ArrayConverter.php
+++ b/src/Symfony/Component/Translation/Util/ArrayConverter.php
@@ -54,7 +54,7 @@ private static function &getElementByPath(array &$tree, array $parts)
         $parentOfElem = null;
 
         foreach ($parts as $i => $part) {
-            if (isset($elem[$part]) && is_string($elem[$part])) {
+            if (isset($elem[$part]) && \is_string($elem[$part])) {
                 /* Process next case:
                  *    'foo': 'test1',
                  *    'foo.bar': 'test2'
@@ -62,14 +62,14 @@ private static function &getElementByPath(array &$tree, array $parts)
                  * $tree['foo'] was string before we found array {bar: test2}.
                  *  Treat new element as string too, e.g. add $tree['foo.bar'] = 'test2';
                  */
-                $elem = &$elem[implode('.', array_slice($parts, $i))];
+                $elem = &$elem[implode('.', \array_slice($parts, $i))];
                 break;
             }
             $parentOfElem = &$elem;
             $elem = &$elem[$part];
         }
 
-        if (is_array($elem) && count($elem) > 0 && $parentOfElem) {
+        if (\is_array($elem) && \count($elem) > 0 && $parentOfElem) {
             /* Process next case:
              *    'foo.bar': 'test1'
              *    'foo': 'test2'
@@ -89,7 +89,7 @@ private static function cancelExpand(array &$tree, $prefix, array $node)
         $prefix .= '.';
 
         foreach ($node as $id => $value) {
-            if (is_string($value)) {
+            if (\is_string($value)) {
                 $tree[$prefix.$id] = $value;
             } else {
                 self::cancelExpand($tree, $prefix.$id, $value);
diff --git a/src/Symfony/Component/Translation/Writer/TranslationWriter.php b/src/Symfony/Component/Translation/Writer/TranslationWriter.php
index 56d99cc7729c..6037ba876186 100644
--- a/src/Symfony/Component/Translation/Writer/TranslationWriter.php
+++ b/src/Symfony/Component/Translation/Writer/TranslationWriter.php
@@ -11,10 +11,10 @@
 
 namespace Symfony\Component\Translation\Writer;
 
-use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Dumper\DumperInterface;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
 use Symfony\Component\Translation\Exception\RuntimeException;
+use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * TranslationWriter writes translation messages.
diff --git a/src/Symfony/Component/Validator/Constraint.php b/src/Symfony/Component/Validator/Constraint.php
index c5890c658aea..70a11ef8c98c 100644
--- a/src/Symfony/Component/Validator/Constraint.php
+++ b/src/Symfony/Component/Validator/Constraint.php
@@ -73,7 +73,7 @@ public static function getErrorName($errorCode)
             throw new InvalidArgumentException(sprintf(
                 'The error code "%s" does not exist for constraint of type "%s".',
                 $errorCode,
-                get_called_class()
+                \get_called_class()
             ));
         }
 
@@ -116,15 +116,15 @@ public function __construct($options = null)
         // The "groups" option is added to the object lazily
         $knownOptions['groups'] = true;
 
-        if (is_array($options) && count($options) >= 1 && isset($options['value']) && !property_exists($this, 'value')) {
+        if (\is_array($options) && \count($options) >= 1 && isset($options['value']) && !property_exists($this, 'value')) {
             $options[$this->getDefaultOption()] = $options['value'];
             unset($options['value']);
         }
 
-        if (is_array($options)) {
+        if (\is_array($options)) {
             reset($options);
         }
-        if (is_array($options) && count($options) > 0 && is_string(key($options))) {
+        if (\is_array($options) && \count($options) > 0 && \is_string(key($options))) {
             foreach ($options as $option => $value) {
                 if (array_key_exists($option, $knownOptions)) {
                     $this->$option = $value;
@@ -133,12 +133,12 @@ public function __construct($options = null)
                     $invalidOptions[] = $option;
                 }
             }
-        } elseif (null !== $options && !(is_array($options) && 0 === count($options))) {
+        } elseif (null !== $options && !(\is_array($options) && 0 === \count($options))) {
             $option = $this->getDefaultOption();
 
             if (null === $option) {
                 throw new ConstraintDefinitionException(
-                    sprintf('No default option is configured for constraint %s', get_class($this))
+                    sprintf('No default option is configured for constraint %s', \get_class($this))
                 );
             }
 
@@ -150,16 +150,16 @@ public function __construct($options = null)
             }
         }
 
-        if (count($invalidOptions) > 0) {
+        if (\count($invalidOptions) > 0) {
             throw new InvalidOptionsException(
-                sprintf('The options "%s" do not exist in constraint %s', implode('", "', $invalidOptions), get_class($this)),
+                sprintf('The options "%s" do not exist in constraint %s', implode('", "', $invalidOptions), \get_class($this)),
                 $invalidOptions
             );
         }
 
-        if (count($missingOptions) > 0) {
+        if (\count($missingOptions) > 0) {
             throw new MissingOptionsException(
-                sprintf('The options "%s" must be set for constraint %s', implode('", "', array_keys($missingOptions)), get_class($this)),
+                sprintf('The options "%s" must be set for constraint %s', implode('", "', array_keys($missingOptions)), \get_class($this)),
                 array_keys($missingOptions)
             );
         }
@@ -185,7 +185,7 @@ public function __set($option, $value)
             return;
         }
 
-        throw new InvalidOptionsException(sprintf('The option "%s" does not exist in constraint %s', $option, get_class($this)), array($option));
+        throw new InvalidOptionsException(sprintf('The option "%s" does not exist in constraint %s', $option, \get_class($this)), array($option));
     }
 
     /**
@@ -211,7 +211,7 @@ public function __get($option)
             return $this->groups;
         }
 
-        throw new InvalidOptionsException(sprintf('The option "%s" does not exist in constraint %s', $option, get_class($this)), array($option));
+        throw new InvalidOptionsException(sprintf('The option "%s" does not exist in constraint %s', $option, \get_class($this)), array($option));
     }
 
     /**
@@ -231,7 +231,7 @@ public function __isset($option)
      */
     public function addImplicitGroupName($group)
     {
-        if (in_array(self::DEFAULT_GROUP, $this->groups) && !in_array($group, $this->groups)) {
+        if (\in_array(self::DEFAULT_GROUP, $this->groups) && !\in_array($group, $this->groups)) {
             $this->groups[] = $group;
         }
     }
@@ -274,7 +274,7 @@ public function getRequiredOptions()
      */
     public function validatedBy()
     {
-        return get_class($this).'Validator';
+        return \get_class($this).'Validator';
     }
 
     /**
diff --git a/src/Symfony/Component/Validator/ConstraintValidator.php b/src/Symfony/Component/Validator/ConstraintValidator.php
index 9a6b54a402d6..35f41889eaee 100644
--- a/src/Symfony/Component/Validator/ConstraintValidator.php
+++ b/src/Symfony/Component/Validator/ConstraintValidator.php
@@ -58,7 +58,7 @@ public function initialize(ExecutionContextInterface $context)
      */
     protected function formatTypeOf($value)
     {
-        return is_object($value) ? get_class($value) : gettype($value);
+        return \is_object($value) ? \get_class($value) : \gettype($value);
     }
 
     /**
@@ -107,7 +107,7 @@ protected function formatValue($value, $format = 0)
             return $value->format('Y-m-d H:i:s');
         }
 
-        if (is_object($value)) {
+        if (\is_object($value)) {
             if (($format & self::OBJECT_TO_STRING) && method_exists($value, '__toString')) {
                 return $value->__toString();
             }
@@ -115,15 +115,15 @@ protected function formatValue($value, $format = 0)
             return 'object';
         }
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             return 'array';
         }
 
-        if (is_string($value)) {
+        if (\is_string($value)) {
             return '"'.$value.'"';
         }
 
-        if (is_resource($value)) {
+        if (\is_resource($value)) {
             return 'resource';
         }
 
diff --git a/src/Symfony/Component/Validator/ConstraintViolation.php b/src/Symfony/Component/Validator/ConstraintViolation.php
index b3462e7d1c6b..57ece5ba3725 100644
--- a/src/Symfony/Component/Validator/ConstraintViolation.php
+++ b/src/Symfony/Component/Validator/ConstraintViolation.php
@@ -70,9 +70,9 @@ public function __construct(?string $message, ?string $messageTemplate, array $p
      */
     public function __toString()
     {
-        if (is_object($this->root)) {
-            $class = 'Object('.get_class($this->root).')';
-        } elseif (is_array($this->root)) {
+        if (\is_object($this->root)) {
+            $class = 'Object('.\get_class($this->root).')';
+        } elseif (\is_array($this->root)) {
             $class = 'Array';
         } else {
             $class = (string) $this->root;
diff --git a/src/Symfony/Component/Validator/ConstraintViolationList.php b/src/Symfony/Component/Validator/ConstraintViolationList.php
index a80d602b26fd..c18dd2195fab 100644
--- a/src/Symfony/Component/Validator/ConstraintViolationList.php
+++ b/src/Symfony/Component/Validator/ConstraintViolationList.php
@@ -120,7 +120,7 @@ public function getIterator()
      */
     public function count()
     {
-        return count($this->violations);
+        return \count($this->violations);
     }
 
     /**
@@ -171,7 +171,7 @@ public function findByCodes($codes)
         $codes = (array) $codes;
         $violations = array();
         foreach ($this as $violation) {
-            if (in_array($violation->getCode(), $codes, true)) {
+            if (\in_array($violation->getCode(), $codes, true)) {
                 $violations[] = $violation;
             }
         }
diff --git a/src/Symfony/Component/Validator/Constraints/AbstractComparison.php b/src/Symfony/Component/Validator/Constraints/AbstractComparison.php
index c41f371e3ae3..0a7e2f3fb733 100644
--- a/src/Symfony/Component/Validator/Constraints/AbstractComparison.php
+++ b/src/Symfony/Component/Validator/Constraints/AbstractComparison.php
@@ -36,17 +36,17 @@ public function __construct($options = null)
             $options = array();
         }
 
-        if (is_array($options)) {
+        if (\is_array($options)) {
             if (!isset($options['value']) && !isset($options['propertyPath'])) {
-                throw new ConstraintDefinitionException(sprintf('The "%s" constraint requires either the "value" or "propertyPath" option to be set.', get_class($this)));
+                throw new ConstraintDefinitionException(sprintf('The "%s" constraint requires either the "value" or "propertyPath" option to be set.', \get_class($this)));
             }
 
             if (isset($options['value']) && isset($options['propertyPath'])) {
-                throw new ConstraintDefinitionException(sprintf('The "%s" constraint requires only one of the "value" or "propertyPath" options to be set, not both.', get_class($this)));
+                throw new ConstraintDefinitionException(sprintf('The "%s" constraint requires only one of the "value" or "propertyPath" options to be set, not both.', \get_class($this)));
             }
 
             if (isset($options['propertyPath']) && !class_exists(PropertyAccess::class)) {
-                throw new ConstraintDefinitionException(sprintf('The "%s" constraint requires the Symfony PropertyAccess component to use the "propertyPath" option.', get_class($this)));
+                throw new ConstraintDefinitionException(sprintf('The "%s" constraint requires the Symfony PropertyAccess component to use the "propertyPath" option.', \get_class($this)));
             }
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/AbstractComparisonValidator.php b/src/Symfony/Component/Validator/Constraints/AbstractComparisonValidator.php
index ad3f4d2cbc84..fec0080fe02e 100644
--- a/src/Symfony/Component/Validator/Constraints/AbstractComparisonValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/AbstractComparisonValidator.php
@@ -55,7 +55,7 @@ public function validate($value, Constraint $constraint)
             try {
                 $comparedValue = $this->getPropertyAccessor()->getValue($object, $path);
             } catch (NoSuchPropertyException $e) {
-                throw new ConstraintDefinitionException(sprintf('Invalid property path "%s" provided to "%s" constraint: %s', $path, get_class($constraint), $e->getMessage()), 0, $e);
+                throw new ConstraintDefinitionException(sprintf('Invalid property path "%s" provided to "%s" constraint: %s', $path, \get_class($constraint), $e->getMessage()), 0, $e);
             }
         } else {
             $comparedValue = $constraint->value;
@@ -65,7 +65,7 @@ public function validate($value, Constraint $constraint)
         // This allows to compare with any date/time value supported by
         // the DateTime constructor:
         // http://php.net/manual/en/datetime.formats.php
-        if (is_string($comparedValue)) {
+        if (\is_string($comparedValue)) {
             if ($value instanceof \DateTimeImmutable) {
                 // If $value is immutable, convert the compared value to a
                 // DateTimeImmutable too
diff --git a/src/Symfony/Component/Validator/Constraints/AllValidator.php b/src/Symfony/Component/Validator/Constraints/AllValidator.php
index a5eb32bbd979..97de37058f65 100644
--- a/src/Symfony/Component/Validator/Constraints/AllValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/AllValidator.php
@@ -33,7 +33,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_array($value) && !$value instanceof \Traversable) {
+        if (!\is_array($value) && !$value instanceof \Traversable) {
             throw new UnexpectedTypeException($value, 'array or Traversable');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/BicValidator.php b/src/Symfony/Component/Validator/Constraints/BicValidator.php
index d2188071fabf..51aecc384ae7 100644
--- a/src/Symfony/Component/Validator/Constraints/BicValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/BicValidator.php
@@ -33,7 +33,7 @@ public function validate($value, Constraint $constraint)
         $canonicalize = str_replace(' ', '', $value);
 
         // the bic must be either 8 or 11 characters long
-        if (!in_array(strlen($canonicalize), array(8, 11))) {
+        if (!\in_array(\strlen($canonicalize), array(8, 11))) {
             $this->context->buildViolation($constraint->message)
                 ->setParameter('{{ value }}', $this->formatValue($value))
                 ->setCode(Bic::INVALID_LENGTH_ERROR)
diff --git a/src/Symfony/Component/Validator/Constraints/Callback.php b/src/Symfony/Component/Validator/Constraints/Callback.php
index 4a43665b0db8..16231105e1f2 100644
--- a/src/Symfony/Component/Validator/Constraints/Callback.php
+++ b/src/Symfony/Component/Validator/Constraints/Callback.php
@@ -32,11 +32,11 @@ class Callback extends Constraint
     public function __construct($options = null)
     {
         // Invocation through annotations with an array parameter only
-        if (is_array($options) && 1 === count($options) && isset($options['value'])) {
+        if (\is_array($options) && 1 === \count($options) && isset($options['value'])) {
             $options = $options['value'];
         }
 
-        if (is_array($options) && !isset($options['callback']) && !isset($options['groups']) && !isset($options['payload'])) {
+        if (\is_array($options) && !isset($options['callback']) && !isset($options['groups']) && !isset($options['payload'])) {
             $options = array('callback' => $options);
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/CallbackValidator.php b/src/Symfony/Component/Validator/Constraints/CallbackValidator.php
index 733ee43ba75e..a66840eae133 100644
--- a/src/Symfony/Component/Validator/Constraints/CallbackValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/CallbackValidator.php
@@ -35,18 +35,18 @@ public function validate($object, Constraint $constraint)
         $method = $constraint->callback;
         if ($method instanceof \Closure) {
             $method($object, $this->context, $constraint->payload);
-        } elseif (is_array($method)) {
-            if (!is_callable($method)) {
-                if (isset($method[0]) && is_object($method[0])) {
-                    $method[0] = get_class($method[0]);
+        } elseif (\is_array($method)) {
+            if (!\is_callable($method)) {
+                if (isset($method[0]) && \is_object($method[0])) {
+                    $method[0] = \get_class($method[0]);
                 }
                 throw new ConstraintDefinitionException(sprintf('%s targeted by Callback constraint is not a valid callable', json_encode($method)));
             }
 
-            call_user_func($method, $object, $this->context, $constraint->payload);
+            \call_user_func($method, $object, $this->context, $constraint->payload);
         } elseif (null !== $object) {
             if (!method_exists($object, $method)) {
-                throw new ConstraintDefinitionException(sprintf('Method "%s" targeted by Callback constraint does not exist in class %s', $method, get_class($object)));
+                throw new ConstraintDefinitionException(sprintf('Method "%s" targeted by Callback constraint does not exist in class %s', $method, \get_class($object)));
             }
 
             $reflMethod = new \ReflectionMethod($object, $method);
diff --git a/src/Symfony/Component/Validator/Constraints/ChoiceValidator.php b/src/Symfony/Component/Validator/Constraints/ChoiceValidator.php
index 2dc5b182ff80..e40b4d9ecf93 100644
--- a/src/Symfony/Component/Validator/Constraints/ChoiceValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/ChoiceValidator.php
@@ -34,7 +34,7 @@ public function validate($value, Constraint $constraint)
             throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Choice');
         }
 
-        if (!is_array($constraint->choices) && !$constraint->callback) {
+        if (!\is_array($constraint->choices) && !$constraint->callback) {
             throw new ConstraintDefinitionException('Either "choices" or "callback" must be specified on constraint Choice');
         }
 
@@ -42,18 +42,18 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if ($constraint->multiple && !is_array($value)) {
+        if ($constraint->multiple && !\is_array($value)) {
             throw new UnexpectedTypeException($value, 'array');
         }
 
         if ($constraint->callback) {
-            if (!is_callable($choices = array($this->context->getObject(), $constraint->callback))
-                && !is_callable($choices = array($this->context->getClassName(), $constraint->callback))
-                && !is_callable($choices = $constraint->callback)
+            if (!\is_callable($choices = array($this->context->getObject(), $constraint->callback))
+                && !\is_callable($choices = array($this->context->getClassName(), $constraint->callback))
+                && !\is_callable($choices = $constraint->callback)
             ) {
                 throw new ConstraintDefinitionException('The Choice constraint expects a valid callback');
             }
-            $choices = call_user_func($choices);
+            $choices = \call_user_func($choices);
         } else {
             $choices = $constraint->choices;
         }
@@ -64,7 +64,7 @@ public function validate($value, Constraint $constraint)
 
         if ($constraint->multiple) {
             foreach ($value as $_value) {
-                if (!in_array($_value, $choices, true)) {
+                if (!\in_array($_value, $choices, true)) {
                     $this->context->buildViolation($constraint->multipleMessage)
                         ->setParameter('{{ value }}', $this->formatValue($_value))
                         ->setCode(Choice::NO_SUCH_CHOICE_ERROR)
@@ -75,7 +75,7 @@ public function validate($value, Constraint $constraint)
                 }
             }
 
-            $count = count($value);
+            $count = \count($value);
 
             if (null !== $constraint->min && $count < $constraint->min) {
                 $this->context->buildViolation($constraint->minMessage)
@@ -96,7 +96,7 @@ public function validate($value, Constraint $constraint)
 
                 return;
             }
-        } elseif (!in_array($value, $choices, true)) {
+        } elseif (!\in_array($value, $choices, true)) {
             $this->context->buildViolation($constraint->message)
                 ->setParameter('{{ value }}', $this->formatValue($value))
                 ->setCode(Choice::NO_SUCH_CHOICE_ERROR)
diff --git a/src/Symfony/Component/Validator/Constraints/Collection.php b/src/Symfony/Component/Validator/Constraints/Collection.php
index 9cb2063042fa..2b5679b22d07 100644
--- a/src/Symfony/Component/Validator/Constraints/Collection.php
+++ b/src/Symfony/Component/Validator/Constraints/Collection.php
@@ -41,7 +41,7 @@ class Collection extends Composite
     public function __construct($options = null)
     {
         // no known options set? $options is the fields array
-        if (is_array($options)
+        if (\is_array($options)
             && !array_intersect(array_keys($options), array('groups', 'fields', 'allowExtraFields', 'allowMissingFields', 'extraFieldsMessage', 'missingFieldsMessage'))) {
             $options = array('fields' => $options);
         }
@@ -56,14 +56,14 @@ protected function initializeNestedConstraints()
     {
         parent::initializeNestedConstraints();
 
-        if (!is_array($this->fields)) {
+        if (!\is_array($this->fields)) {
             throw new ConstraintDefinitionException(sprintf('The option "fields" is expected to be an array in constraint %s', __CLASS__));
         }
 
         foreach ($this->fields as $fieldName => $field) {
             // the XmlFileLoader and YamlFileLoader pass the field Optional
             // and Required constraint as an array with exactly one element
-            if (is_array($field) && 1 == count($field)) {
+            if (\is_array($field) && 1 == \count($field)) {
                 $this->fields[$fieldName] = $field = $field[0];
             }
 
diff --git a/src/Symfony/Component/Validator/Constraints/CollectionValidator.php b/src/Symfony/Component/Validator/Constraints/CollectionValidator.php
index f4a6d19ec757..e3a297329d1c 100644
--- a/src/Symfony/Component/Validator/Constraints/CollectionValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/CollectionValidator.php
@@ -33,7 +33,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_array($value) && !($value instanceof \Traversable && $value instanceof \ArrayAccess)) {
+        if (!\is_array($value) && !($value instanceof \Traversable && $value instanceof \ArrayAccess)) {
             throw new UnexpectedTypeException($value, 'array or Traversable and ArrayAccess');
         }
 
@@ -50,11 +50,11 @@ public function validate($value, Constraint $constraint)
 
         foreach ($constraint->fields as $field => $fieldConstraint) {
             // bug fix issue #2779
-            $existsInArray = is_array($value) && array_key_exists($field, $value);
+            $existsInArray = \is_array($value) && array_key_exists($field, $value);
             $existsInArrayAccess = $value instanceof \ArrayAccess && $value->offsetExists($field);
 
             if ($existsInArray || $existsInArrayAccess) {
-                if (count($fieldConstraint->constraints) > 0) {
+                if (\count($fieldConstraint->constraints) > 0) {
                     $context->getValidator()
                         ->inContext($context)
                         ->atPath('['.$field.']')
diff --git a/src/Symfony/Component/Validator/Constraints/Composite.php b/src/Symfony/Component/Validator/Constraints/Composite.php
index d1391bb0724a..2f2b8d29a0e6 100644
--- a/src/Symfony/Component/Validator/Constraints/Composite.php
+++ b/src/Symfony/Component/Validator/Constraints/Composite.php
@@ -61,21 +61,21 @@ public function __construct($options = null)
         $compositeOption = $this->getCompositeOption();
         $nestedConstraints = $this->$compositeOption;
 
-        if (!is_array($nestedConstraints)) {
+        if (!\is_array($nestedConstraints)) {
             $nestedConstraints = array($nestedConstraints);
         }
 
         foreach ($nestedConstraints as $constraint) {
             if (!$constraint instanceof Constraint) {
-                if (is_object($constraint)) {
-                    $constraint = get_class($constraint);
+                if (\is_object($constraint)) {
+                    $constraint = \get_class($constraint);
                 }
 
-                throw new ConstraintDefinitionException(sprintf('The value %s is not an instance of Constraint in constraint %s', $constraint, get_class($this)));
+                throw new ConstraintDefinitionException(sprintf('The value %s is not an instance of Constraint in constraint %s', $constraint, \get_class($this)));
             }
 
             if ($constraint instanceof Valid) {
-                throw new ConstraintDefinitionException(sprintf('The constraint Valid cannot be nested inside constraint %s. You can only declare the Valid constraint directly on a field or method.', get_class($this)));
+                throw new ConstraintDefinitionException(sprintf('The constraint Valid cannot be nested inside constraint %s. You can only declare the Valid constraint directly on a field or method.', \get_class($this)));
             }
         }
 
@@ -98,13 +98,13 @@ public function __construct($options = null)
             if (property_exists($constraint, 'groups')) {
                 $excessGroups = array_diff($constraint->groups, $this->groups);
 
-                if (count($excessGroups) > 0) {
+                if (\count($excessGroups) > 0) {
                     throw new ConstraintDefinitionException(sprintf(
                         'The group(s) "%s" passed to the constraint %s '.
                         'should also be passed to its containing constraint %s',
                         implode('", "', $excessGroups),
-                        get_class($constraint),
-                        get_class($this)
+                        \get_class($constraint),
+                        \get_class($this)
                     ));
                 }
             } else {
diff --git a/src/Symfony/Component/Validator/Constraints/Count.php b/src/Symfony/Component/Validator/Constraints/Count.php
index 53870fb59731..0a54ee78db77 100644
--- a/src/Symfony/Component/Validator/Constraints/Count.php
+++ b/src/Symfony/Component/Validator/Constraints/Count.php
@@ -38,7 +38,7 @@ class Count extends Constraint
 
     public function __construct($options = null)
     {
-        if (null !== $options && !is_array($options)) {
+        if (null !== $options && !\is_array($options)) {
             $options = array(
                 'min' => $options,
                 'max' => $options,
diff --git a/src/Symfony/Component/Validator/Constraints/CountValidator.php b/src/Symfony/Component/Validator/Constraints/CountValidator.php
index 69c8257206b5..39be8aa82e9a 100644
--- a/src/Symfony/Component/Validator/Constraints/CountValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/CountValidator.php
@@ -29,11 +29,11 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_array($value) && !$value instanceof \Countable) {
+        if (!\is_array($value) && !$value instanceof \Countable) {
             throw new UnexpectedTypeException($value, 'array or \Countable');
         }
 
-        $count = count($value);
+        $count = \count($value);
 
         if (null !== $constraint->max && $count > $constraint->max) {
             $this->context->buildViolation($constraint->min == $constraint->max ? $constraint->exactMessage : $constraint->maxMessage)
diff --git a/src/Symfony/Component/Validator/Constraints/CountryValidator.php b/src/Symfony/Component/Validator/Constraints/CountryValidator.php
index 3cea3b738467..46585da8b969 100644
--- a/src/Symfony/Component/Validator/Constraints/CountryValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/CountryValidator.php
@@ -36,7 +36,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/CurrencyValidator.php b/src/Symfony/Component/Validator/Constraints/CurrencyValidator.php
index a110bec6054f..42fa8cfa4568 100644
--- a/src/Symfony/Component/Validator/Constraints/CurrencyValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/CurrencyValidator.php
@@ -37,7 +37,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php b/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php
index 63c6a7b90300..6ed25a3dfc29 100644
--- a/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php
@@ -33,7 +33,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/DateValidator.php b/src/Symfony/Component/Validator/Constraints/DateValidator.php
index ed836de9aced..a1492c54c9a0 100644
--- a/src/Symfony/Component/Validator/Constraints/DateValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/DateValidator.php
@@ -51,7 +51,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/EmailValidator.php b/src/Symfony/Component/Validator/Constraints/EmailValidator.php
index 04e8e71c312a..fb64dd11892a 100644
--- a/src/Symfony/Component/Validator/Constraints/EmailValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/EmailValidator.php
@@ -43,7 +43,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/File.php b/src/Symfony/Component/Validator/Constraints/File.php
index ff2627b38e80..33215bb7b55e 100644
--- a/src/Symfony/Component/Validator/Constraints/File.php
+++ b/src/Symfony/Component/Validator/Constraints/File.php
@@ -113,7 +113,7 @@ private function normalizeBinaryFormat($maxSize)
             $this->binaryFormat = null === $this->binaryFormat ? false : $this->binaryFormat;
         } elseif (preg_match('/^(\d++)('.implode('|', array_keys($factors)).')$/i', $maxSize, $matches)) {
             $this->maxSize = $matches[1] * $factors[$unit = strtolower($matches[2])];
-            $this->binaryFormat = null === $this->binaryFormat ? 2 === strlen($unit) : $this->binaryFormat;
+            $this->binaryFormat = null === $this->binaryFormat ? 2 === \strlen($unit) : $this->binaryFormat;
         } else {
             throw new ConstraintDefinitionException(sprintf('"%s" is not a valid maximum size', $this->maxSize));
         }
diff --git a/src/Symfony/Component/Validator/Constraints/FileValidator.php b/src/Symfony/Component/Validator/Constraints/FileValidator.php
index e752f2a1e650..e59f25247e9f 100644
--- a/src/Symfony/Component/Validator/Constraints/FileValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/FileValidator.php
@@ -113,7 +113,7 @@ public function validate($value, Constraint $constraint)
             }
         }
 
-        if (!is_scalar($value) && !$value instanceof FileObject && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !$value instanceof FileObject && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
@@ -196,7 +196,7 @@ public function validate($value, Constraint $constraint)
 
     private static function moreDecimalsThan($double, $numberOfDecimals)
     {
-        return strlen((string) $double) > strlen(round($double, $numberOfDecimals));
+        return \strlen((string) $double) > \strlen(round($double, $numberOfDecimals));
     }
 
     /**
diff --git a/src/Symfony/Component/Validator/Constraints/IbanValidator.php b/src/Symfony/Component/Validator/Constraints/IbanValidator.php
index 3b4fcc02d3ce..9d8d5b863cc8 100644
--- a/src/Symfony/Component/Validator/Constraints/IbanValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/IbanValidator.php
@@ -148,7 +148,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
@@ -231,7 +231,7 @@ private static function toBigInt($string)
         foreach ($chars as $char) {
             // Convert uppercase characters to ordinals, starting with 10 for "A"
             if (ctype_upper($char)) {
-                $bigInt .= (ord($char) - 55);
+                $bigInt .= (\ord($char) - 55);
 
                 continue;
             }
diff --git a/src/Symfony/Component/Validator/Constraints/ImageValidator.php b/src/Symfony/Component/Validator/Constraints/ImageValidator.php
index 0b3122bbc4e5..4b6a6f3b20c6 100644
--- a/src/Symfony/Component/Validator/Constraints/ImageValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/ImageValidator.php
@@ -34,11 +34,11 @@ public function validate($value, Constraint $constraint)
             throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Image');
         }
 
-        $violations = count($this->context->getViolations());
+        $violations = \count($this->context->getViolations());
 
         parent::validate($value, $constraint);
 
-        $failed = count($this->context->getViolations()) !== $violations;
+        $failed = \count($this->context->getViolations()) !== $violations;
 
         if ($failed || null === $value || '' === $value) {
             return;
@@ -217,7 +217,7 @@ public function validate($value, Constraint $constraint)
         }
 
         if ($constraint->detectCorrupted) {
-            if (!function_exists('imagecreatefromstring')) {
+            if (!\function_exists('imagecreatefromstring')) {
                 throw new RuntimeException('Corrupted images detection requires installed and enabled GD extension');
             }
 
diff --git a/src/Symfony/Component/Validator/Constraints/Ip.php b/src/Symfony/Component/Validator/Constraints/Ip.php
index 36772c62aa52..f45c4cacebca 100644
--- a/src/Symfony/Component/Validator/Constraints/Ip.php
+++ b/src/Symfony/Component/Validator/Constraints/Ip.php
@@ -79,7 +79,7 @@ public function __construct($options = null)
     {
         parent::__construct($options);
 
-        if (!in_array($this->version, self::$versions)) {
+        if (!\in_array($this->version, self::$versions)) {
             throw new ConstraintDefinitionException(sprintf('The option "version" must be one of "%s"', implode('", "', self::$versions)));
         }
     }
diff --git a/src/Symfony/Component/Validator/Constraints/IpValidator.php b/src/Symfony/Component/Validator/Constraints/IpValidator.php
index 7f806bf7fcf2..5c687b900fdb 100644
--- a/src/Symfony/Component/Validator/Constraints/IpValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/IpValidator.php
@@ -36,7 +36,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/IsbnValidator.php b/src/Symfony/Component/Validator/Constraints/IsbnValidator.php
index 2e342673d37c..9f0d1fa1a35a 100644
--- a/src/Symfony/Component/Validator/Constraints/IsbnValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/IsbnValidator.php
@@ -39,7 +39,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
@@ -145,7 +145,7 @@ protected function validateIsbn13($isbn)
             return Isbn::INVALID_CHARACTERS_ERROR;
         }
 
-        $length = strlen($isbn);
+        $length = \strlen($isbn);
 
         if ($length < 13) {
             return Isbn::TOO_SHORT_ERROR;
diff --git a/src/Symfony/Component/Validator/Constraints/IssnValidator.php b/src/Symfony/Component/Validator/Constraints/IssnValidator.php
index ae1bb6fa3481..f045e62e2ca1 100644
--- a/src/Symfony/Component/Validator/Constraints/IssnValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/IssnValidator.php
@@ -38,7 +38,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
@@ -59,7 +59,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        $length = strlen($canonical);
+        $length = \strlen($canonical);
 
         if ($length < 8) {
             $this->context->buildViolation($constraint->message)
diff --git a/src/Symfony/Component/Validator/Constraints/LanguageValidator.php b/src/Symfony/Component/Validator/Constraints/LanguageValidator.php
index c0bc08fdd77a..1722034720c6 100644
--- a/src/Symfony/Component/Validator/Constraints/LanguageValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/LanguageValidator.php
@@ -36,7 +36,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/Length.php b/src/Symfony/Component/Validator/Constraints/Length.php
index 0f965089b5cd..20a17fabca55 100644
--- a/src/Symfony/Component/Validator/Constraints/Length.php
+++ b/src/Symfony/Component/Validator/Constraints/Length.php
@@ -42,7 +42,7 @@ class Length extends Constraint
 
     public function __construct($options = null)
     {
-        if (null !== $options && !is_array($options)) {
+        if (null !== $options && !\is_array($options)) {
             $options = array(
                 'min' => $options,
                 'max' => $options,
diff --git a/src/Symfony/Component/Validator/Constraints/LengthValidator.php b/src/Symfony/Component/Validator/Constraints/LengthValidator.php
index 490f5a36aa48..d8cb09ccb65f 100644
--- a/src/Symfony/Component/Validator/Constraints/LengthValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/LengthValidator.php
@@ -33,7 +33,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/LocaleValidator.php b/src/Symfony/Component/Validator/Constraints/LocaleValidator.php
index 93eab8cb7e75..40d63970e25a 100644
--- a/src/Symfony/Component/Validator/Constraints/LocaleValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/LocaleValidator.php
@@ -36,7 +36,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
@@ -44,7 +44,7 @@ public function validate($value, Constraint $constraint)
         $locales = Intl::getLocaleBundle()->getLocaleNames();
         $aliases = Intl::getLocaleBundle()->getAliases();
 
-        if (!isset($locales[$value]) && !in_array($value, $aliases)) {
+        if (!isset($locales[$value]) && !\in_array($value, $aliases)) {
             $this->context->buildViolation($constraint->message)
                 ->setParameter('{{ value }}', $this->formatValue($value))
                 ->setCode(Locale::NO_SUCH_LOCALE_ERROR)
diff --git a/src/Symfony/Component/Validator/Constraints/LuhnValidator.php b/src/Symfony/Component/Validator/Constraints/LuhnValidator.php
index 85e4d7621500..554fc6f48b10 100644
--- a/src/Symfony/Component/Validator/Constraints/LuhnValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/LuhnValidator.php
@@ -49,7 +49,7 @@ public function validate($value, Constraint $constraint)
 
         // Work with strings only, because long numbers are represented as floats
         // internally and don't work with strlen()
-        if (!is_string($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!\is_string($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
@@ -65,7 +65,7 @@ public function validate($value, Constraint $constraint)
         }
 
         $checkSum = 0;
-        $length = strlen($value);
+        $length = \strlen($value);
 
         // Starting with the last digit and walking left, add every second
         // digit to the check sum
diff --git a/src/Symfony/Component/Validator/Constraints/RangeValidator.php b/src/Symfony/Component/Validator/Constraints/RangeValidator.php
index ac140dbbf34e..e0cb92a93e9e 100644
--- a/src/Symfony/Component/Validator/Constraints/RangeValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/RangeValidator.php
@@ -50,11 +50,11 @@ public function validate($value, Constraint $constraint)
         // the DateTime constructor:
         // http://php.net/manual/en/datetime.formats.php
         if ($value instanceof \DateTimeInterface) {
-            if (is_string($min)) {
+            if (\is_string($min)) {
                 $min = new \DateTime($min);
             }
 
-            if (is_string($max)) {
+            if (\is_string($max)) {
                 $max = new \DateTime($max);
             }
         }
diff --git a/src/Symfony/Component/Validator/Constraints/Regex.php b/src/Symfony/Component/Validator/Constraints/Regex.php
index 7a43667fef63..cb122102259c 100644
--- a/src/Symfony/Component/Validator/Constraints/Regex.php
+++ b/src/Symfony/Component/Validator/Constraints/Regex.php
@@ -70,7 +70,7 @@ public function getHtmlPattern()
         }
 
         // Quit if delimiters not at very beginning/end (e.g. when options are passed)
-        if ($this->pattern[0] !== $this->pattern[strlen($this->pattern) - 1]) {
+        if ($this->pattern[0] !== $this->pattern[\strlen($this->pattern) - 1]) {
             return;
         }
 
@@ -95,7 +95,7 @@ public function getHtmlPattern()
         $pattern = '^' === $pattern[0] ? substr($pattern, 1) : '.*'.$pattern;
 
         // Trim trailing $, otherwise append .*
-        $pattern = '$' === $pattern[strlen($pattern) - 1] ? substr($pattern, 0, -1) : $pattern.'.*';
+        $pattern = '$' === $pattern[\strlen($pattern) - 1] ? substr($pattern, 0, -1) : $pattern.'.*';
 
         return $pattern;
     }
diff --git a/src/Symfony/Component/Validator/Constraints/RegexValidator.php b/src/Symfony/Component/Validator/Constraints/RegexValidator.php
index 48ee61a74edc..c6b70feb7f0e 100644
--- a/src/Symfony/Component/Validator/Constraints/RegexValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/RegexValidator.php
@@ -36,7 +36,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/TimeValidator.php b/src/Symfony/Component/Validator/Constraints/TimeValidator.php
index 3f0234b8b089..b1ee40c53051 100644
--- a/src/Symfony/Component/Validator/Constraints/TimeValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/TimeValidator.php
@@ -51,7 +51,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
diff --git a/src/Symfony/Component/Validator/Constraints/Traverse.php b/src/Symfony/Component/Validator/Constraints/Traverse.php
index 9d8bc126d188..0b74d98d463e 100644
--- a/src/Symfony/Component/Validator/Constraints/Traverse.php
+++ b/src/Symfony/Component/Validator/Constraints/Traverse.php
@@ -25,7 +25,7 @@ class Traverse extends Constraint
 
     public function __construct($options = null)
     {
-        if (is_array($options) && array_key_exists('groups', $options)) {
+        if (\is_array($options) && array_key_exists('groups', $options)) {
             throw new ConstraintDefinitionException(sprintf(
                 'The option "groups" is not supported by the constraint %s',
                 __CLASS__
diff --git a/src/Symfony/Component/Validator/Constraints/TypeValidator.php b/src/Symfony/Component/Validator/Constraints/TypeValidator.php
index ea7562bfcf9a..206836d3617f 100644
--- a/src/Symfony/Component/Validator/Constraints/TypeValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/TypeValidator.php
@@ -38,9 +38,9 @@ public function validate($value, Constraint $constraint)
         $isFunction = 'is_'.$type;
         $ctypeFunction = 'ctype_'.$type;
 
-        if (function_exists($isFunction) && $isFunction($value)) {
+        if (\function_exists($isFunction) && $isFunction($value)) {
             return;
-        } elseif (function_exists($ctypeFunction) && $ctypeFunction($value)) {
+        } elseif (\function_exists($ctypeFunction) && $ctypeFunction($value)) {
             return;
         } elseif ($value instanceof $constraint->type) {
             return;
diff --git a/src/Symfony/Component/Validator/Constraints/UrlValidator.php b/src/Symfony/Component/Validator/Constraints/UrlValidator.php
index eb244de1fe3a..148a6e75dcc3 100644
--- a/src/Symfony/Component/Validator/Constraints/UrlValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/UrlValidator.php
@@ -52,7 +52,7 @@ public function validate($value, Constraint $constraint)
             return;
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
@@ -73,7 +73,7 @@ public function validate($value, Constraint $constraint)
         }
 
         if ($constraint->checkDNS) {
-            if (!in_array($constraint->checkDNS, array(
+            if (!\in_array($constraint->checkDNS, array(
                 Url::CHECK_DNS_TYPE_ANY,
                 Url::CHECK_DNS_TYPE_A,
                 Url::CHECK_DNS_TYPE_A6,
@@ -87,12 +87,12 @@ public function validate($value, Constraint $constraint)
                 Url::CHECK_DNS_TYPE_SRV,
                 Url::CHECK_DNS_TYPE_TXT,
             ), true)) {
-                throw new InvalidOptionsException(sprintf('Invalid value for option "checkDNS" in constraint %s', get_class($constraint)), array('checkDNS'));
+                throw new InvalidOptionsException(sprintf('Invalid value for option "checkDNS" in constraint %s', \get_class($constraint)), array('checkDNS'));
             }
 
             $host = parse_url($value, PHP_URL_HOST);
 
-            if (!is_string($host) || !checkdnsrr($host, $constraint->checkDNS)) {
+            if (!\is_string($host) || !checkdnsrr($host, $constraint->checkDNS)) {
                 $this->context->buildViolation($constraint->dnsMessage)
                     ->setParameter('{{ value }}', $this->formatValue($host))
                     ->setCode(Url::INVALID_URL_ERROR)
diff --git a/src/Symfony/Component/Validator/Constraints/UuidValidator.php b/src/Symfony/Component/Validator/Constraints/UuidValidator.php
index be177e2255ff..38e9a0da8585 100644
--- a/src/Symfony/Component/Validator/Constraints/UuidValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/UuidValidator.php
@@ -74,7 +74,7 @@ public function validate($value, Constraint $constraint)
             throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Uuid');
         }
 
-        if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
             throw new UnexpectedTypeException($value, 'string');
         }
 
@@ -235,7 +235,7 @@ private function validateStrict($value, Uuid $constraint)
         }
 
         // Check version
-        if (!in_array($value[self::STRICT_VERSION_POSITION], $constraint->versions)) {
+        if (!\in_array($value[self::STRICT_VERSION_POSITION], $constraint->versions)) {
             $this->context->buildViolation($constraint->message)
                 ->setParameter('{{ value }}', $this->formatValue($value))
                 ->setCode(Uuid::INVALID_VERSION_ERROR)
diff --git a/src/Symfony/Component/Validator/ContainerConstraintValidatorFactory.php b/src/Symfony/Component/Validator/ContainerConstraintValidatorFactory.php
index a40be361f1c7..43c8a0d7cb6d 100644
--- a/src/Symfony/Component/Validator/ContainerConstraintValidatorFactory.php
+++ b/src/Symfony/Component/Validator/ContainerConstraintValidatorFactory.php
@@ -46,7 +46,7 @@ public function getInstance(Constraint $constraint)
                 $this->validators[$name] = $this->container->get($name);
             } else {
                 if (!class_exists($name)) {
-                    throw new ValidatorException(sprintf('Constraint validator "%s" does not exist or it is not enabled. Check the "validatedBy" method in your constraint class "%s".', $name, get_class($constraint)));
+                    throw new ValidatorException(sprintf('Constraint validator "%s" does not exist or it is not enabled. Check the "validatedBy" method in your constraint class "%s".', $name, \get_class($constraint)));
                 }
 
                 $this->validators[$name] = new $name();
diff --git a/src/Symfony/Component/Validator/Context/ExecutionContext.php b/src/Symfony/Component/Validator/Context/ExecutionContext.php
index 1c1aa7216cb6..7e074863d138 100644
--- a/src/Symfony/Component/Validator/Context/ExecutionContext.php
+++ b/src/Symfony/Component/Validator/Context/ExecutionContext.php
@@ -16,8 +16,8 @@
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationList;
 use Symfony\Component\Validator\Mapping\ClassMetadataInterface;
-use Symfony\Component\Validator\Mapping\MetadataInterface;
 use Symfony\Component\Validator\Mapping\MemberMetadata;
+use Symfony\Component\Validator\Mapping\MetadataInterface;
 use Symfony\Component\Validator\Mapping\PropertyMetadataInterface;
 use Symfony\Component\Validator\Util\PropertyPath;
 use Symfony\Component\Validator\Validator\ValidatorInterface;
diff --git a/src/Symfony/Component/Validator/Context/ExecutionContextInterface.php b/src/Symfony/Component/Validator/Context/ExecutionContextInterface.php
index fa0053bb420d..ac79ab4dc7b9 100644
--- a/src/Symfony/Component/Validator/Context/ExecutionContextInterface.php
+++ b/src/Symfony/Component/Validator/Context/ExecutionContextInterface.php
@@ -12,11 +12,11 @@
 namespace Symfony\Component\Validator\Context;
 
 use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintViolationListInterface;
 use Symfony\Component\Validator\Mapping;
 use Symfony\Component\Validator\Mapping\MetadataInterface;
 use Symfony\Component\Validator\Validator\ValidatorInterface;
 use Symfony\Component\Validator\Violation\ConstraintViolationBuilderInterface;
-use Symfony\Component\Validator\ConstraintViolationListInterface;
 
 /**
  * The context of a validation run.
diff --git a/src/Symfony/Component/Validator/DataCollector/ValidatorDataCollector.php b/src/Symfony/Component/Validator/DataCollector/ValidatorDataCollector.php
index 1b91600a4988..f7165e5fbdae 100644
--- a/src/Symfony/Component/Validator/DataCollector/ValidatorDataCollector.php
+++ b/src/Symfony/Component/Validator/DataCollector/ValidatorDataCollector.php
@@ -59,7 +59,7 @@ public function lateCollect()
         $collected = $this->validator->getCollectedData();
         $this->data['calls'] = $this->cloneVar($collected);
         $this->data['violations_count'] = array_reduce($collected, function ($previous, $item) {
-            return $previous + count($item['violations']);
+            return $previous + \count($item['violations']);
         }, 0);
     }
 
@@ -103,7 +103,7 @@ protected function getCasters()
             FormInterface::class => function (FormInterface $f, array $a) {
                 return array(
                     Caster::PREFIX_VIRTUAL.'name' => $f->getName(),
-                    Caster::PREFIX_VIRTUAL.'type_class' => new ClassStub(get_class($f->getConfig()->getType()->getInnerType())),
+                    Caster::PREFIX_VIRTUAL.'type_class' => new ClassStub(\get_class($f->getConfig()->getType()->getInnerType())),
                     Caster::PREFIX_VIRTUAL.'data' => $f->getData(),
                 );
             },
diff --git a/src/Symfony/Component/Validator/DependencyInjection/AddConstraintValidatorsPass.php b/src/Symfony/Component/Validator/DependencyInjection/AddConstraintValidatorsPass.php
index f10385c8c8f8..589eb5368bf1 100644
--- a/src/Symfony/Component/Validator/DependencyInjection/AddConstraintValidatorsPass.php
+++ b/src/Symfony/Component/Validator/DependencyInjection/AddConstraintValidatorsPass.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Validator\DependencyInjection;
 
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 
 /**
diff --git a/src/Symfony/Component/Validator/DependencyInjection/AddValidatorInitializersPass.php b/src/Symfony/Component/Validator/DependencyInjection/AddValidatorInitializersPass.php
index aa7dc0c74ba9..9dabb58c4f12 100644
--- a/src/Symfony/Component/Validator/DependencyInjection/AddValidatorInitializersPass.php
+++ b/src/Symfony/Component/Validator/DependencyInjection/AddValidatorInitializersPass.php
@@ -11,9 +11,9 @@
 
 namespace Symfony\Component\Validator\DependencyInjection;
 
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
diff --git a/src/Symfony/Component/Validator/Exception/UnexpectedTypeException.php b/src/Symfony/Component/Validator/Exception/UnexpectedTypeException.php
index 3240aab6034c..55d56dd9c857 100644
--- a/src/Symfony/Component/Validator/Exception/UnexpectedTypeException.php
+++ b/src/Symfony/Component/Validator/Exception/UnexpectedTypeException.php
@@ -15,6 +15,6 @@ class UnexpectedTypeException extends ValidatorException
 {
     public function __construct($value, string $expectedType)
     {
-        parent::__construct(sprintf('Expected argument of type "%s", "%s" given', $expectedType, is_object($value) ? get_class($value) : gettype($value)));
+        parent::__construct(sprintf('Expected argument of type "%s", "%s" given', $expectedType, \is_object($value) ? \get_class($value) : \gettype($value)));
     }
 }
diff --git a/src/Symfony/Component/Validator/Mapping/ClassMetadata.php b/src/Symfony/Component/Validator/Mapping/ClassMetadata.php
index d7773861445f..cffbaf636643 100644
--- a/src/Symfony/Component/Validator/Mapping/ClassMetadata.php
+++ b/src/Symfony/Component/Validator/Mapping/ClassMetadata.php
@@ -174,17 +174,17 @@ public function getDefaultGroup()
      */
     public function addConstraint(Constraint $constraint)
     {
-        if (!in_array(Constraint::CLASS_CONSTRAINT, (array) $constraint->getTargets())) {
+        if (!\in_array(Constraint::CLASS_CONSTRAINT, (array) $constraint->getTargets())) {
             throw new ConstraintDefinitionException(sprintf(
                 'The constraint "%s" cannot be put on classes.',
-                get_class($constraint)
+                \get_class($constraint)
             ));
         }
 
         if ($constraint instanceof Valid) {
             throw new ConstraintDefinitionException(sprintf(
                 'The constraint "%s" cannot be put on classes.',
-                get_class($constraint)
+                \get_class($constraint)
             ));
         }
 
@@ -345,7 +345,7 @@ public function mergeConstraints(self $source)
                 $member = clone $member;
 
                 foreach ($member->getConstraints() as $constraint) {
-                    if (in_array($constraint::DEFAULT_GROUP, $constraint->groups, true)) {
+                    if (\in_array($constraint::DEFAULT_GROUP, $constraint->groups, true)) {
                         $member->constraintsByGroup[$this->getDefaultGroup()][] = $constraint;
                     }
 
@@ -410,15 +410,15 @@ public function setGroupSequence($groupSequence)
             throw new GroupDefinitionException('Defining a static group sequence is not allowed with a group sequence provider');
         }
 
-        if (is_array($groupSequence)) {
+        if (\is_array($groupSequence)) {
             $groupSequence = new GroupSequence($groupSequence);
         }
 
-        if (in_array(Constraint::DEFAULT_GROUP, $groupSequence->groups, true)) {
+        if (\in_array(Constraint::DEFAULT_GROUP, $groupSequence->groups, true)) {
             throw new GroupDefinitionException(sprintf('The group "%s" is not allowed in group sequences', Constraint::DEFAULT_GROUP));
         }
 
-        if (!in_array($this->getDefaultGroup(), $groupSequence->groups, true)) {
+        if (!\in_array($this->getDefaultGroup(), $groupSequence->groups, true)) {
             throw new GroupDefinitionException(sprintf('The group "%s" is missing in the group sequence', $this->getDefaultGroup()));
         }
 
@@ -432,7 +432,7 @@ public function setGroupSequence($groupSequence)
      */
     public function hasGroupSequence()
     {
-        return $this->groupSequence && count($this->groupSequence->groups) > 0;
+        return $this->groupSequence && \count($this->groupSequence->groups) > 0;
     }
 
     /**
diff --git a/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php b/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php
index fbb8c66669fc..9d5da256f5dd 100644
--- a/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php
+++ b/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php
@@ -78,11 +78,11 @@ public function __construct(LoaderInterface $loader = null, CacheInterface $cach
      */
     public function getMetadataFor($value)
     {
-        if (!is_object($value) && !is_string($value)) {
-            throw new NoSuchMetadataException(sprintf('Cannot create metadata for non-objects. Got: %s', gettype($value)));
+        if (!\is_object($value) && !\is_string($value)) {
+            throw new NoSuchMetadataException(sprintf('Cannot create metadata for non-objects. Got: %s', \gettype($value)));
         }
 
-        $class = ltrim(is_object($value) ? get_class($value) : $value, '\\');
+        $class = ltrim(\is_object($value) ? \get_class($value) : $value, '\\');
 
         if (isset($this->loadedClasses[$class])) {
             return $this->loadedClasses[$class];
@@ -154,11 +154,11 @@ private function mergeConstraints(ClassMetadata $metadata)
      */
     public function hasMetadataFor($value)
     {
-        if (!is_object($value) && !is_string($value)) {
+        if (!\is_object($value) && !\is_string($value)) {
             return false;
         }
 
-        $class = ltrim(is_object($value) ? get_class($value) : $value, '\\');
+        $class = ltrim(\is_object($value) ? \get_class($value) : $value, '\\');
 
         return class_exists($class) || interface_exists($class, false);
     }
diff --git a/src/Symfony/Component/Validator/Mapping/GenericMetadata.php b/src/Symfony/Component/Validator/Mapping/GenericMetadata.php
index 83099aa5e376..21f9da133418 100644
--- a/src/Symfony/Component/Validator/Mapping/GenericMetadata.php
+++ b/src/Symfony/Component/Validator/Mapping/GenericMetadata.php
@@ -125,7 +125,7 @@ public function addConstraint(Constraint $constraint)
             throw new ConstraintDefinitionException(sprintf(
                 'The constraint "%s" can only be put on classes. Please use '.
                 '"Symfony\Component\Validator\Constraints\Valid" instead.',
-                get_class($constraint)
+                \get_class($constraint)
             ));
         }
 
@@ -181,7 +181,7 @@ public function getConstraints()
      */
     public function hasConstraints()
     {
-        return count($this->constraints) > 0;
+        return \count($this->constraints) > 0;
     }
 
     /**
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/LoaderChain.php b/src/Symfony/Component/Validator/Mapping/Loader/LoaderChain.php
index f82c40000239..de80dcd8ad50 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/LoaderChain.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/LoaderChain.php
@@ -36,7 +36,7 @@ public function __construct(array $loaders)
     {
         foreach ($loaders as $loader) {
             if (!$loader instanceof LoaderInterface) {
-                throw new MappingException(sprintf('Class %s is expected to implement LoaderInterface', get_class($loader)));
+                throw new MappingException(sprintf('Class %s is expected to implement LoaderInterface', \get_class($loader)));
             }
         }
 
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php
index 6548c5aecea4..398d81e93663 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php
@@ -75,17 +75,17 @@ protected function parseConstraints(\SimpleXMLElement $nodes)
         $constraints = array();
 
         foreach ($nodes as $node) {
-            if (count($node) > 0) {
-                if (count($node->value) > 0) {
+            if (\count($node) > 0) {
+                if (\count($node->value) > 0) {
                     $options = $this->parseValues($node->value);
-                } elseif (count($node->constraint) > 0) {
+                } elseif (\count($node->constraint) > 0) {
                     $options = $this->parseConstraints($node->constraint);
-                } elseif (count($node->option) > 0) {
+                } elseif (\count($node->option) > 0) {
                     $options = $this->parseOptions($node->option);
                 } else {
                     $options = array();
                 }
-            } elseif (strlen((string) $node) > 0) {
+            } elseif (\strlen((string) $node) > 0) {
                 $options = XmlUtils::phpize(trim($node));
             } else {
                 $options = null;
@@ -109,10 +109,10 @@ protected function parseValues(\SimpleXMLElement $nodes)
         $values = array();
 
         foreach ($nodes as $node) {
-            if (count($node) > 0) {
-                if (count($node->value) > 0) {
+            if (\count($node) > 0) {
+                if (\count($node->value) > 0) {
                     $value = $this->parseValues($node->value);
-                } elseif (count($node->constraint) > 0) {
+                } elseif (\count($node->constraint) > 0) {
                     $value = $this->parseConstraints($node->constraint);
                 } else {
                     $value = array();
@@ -143,17 +143,17 @@ protected function parseOptions(\SimpleXMLElement $nodes)
         $options = array();
 
         foreach ($nodes as $node) {
-            if (count($node) > 0) {
-                if (count($node->value) > 0) {
+            if (\count($node) > 0) {
+                if (\count($node->value) > 0) {
                     $value = $this->parseValues($node->value);
-                } elseif (count($node->constraint) > 0) {
+                } elseif (\count($node->constraint) > 0) {
                     $value = $this->parseConstraints($node->constraint);
                 } else {
                     $value = array();
                 }
             } else {
                 $value = XmlUtils::phpize($node);
-                if (is_string($value)) {
+                if (\is_string($value)) {
                     $value = trim($value);
                 }
             }
@@ -203,12 +203,12 @@ private function loadClassesFromXml()
 
     private function loadClassMetadataFromXml(ClassMetadata $metadata, \SimpleXMLElement $classDescription)
     {
-        if (count($classDescription->{'group-sequence-provider'}) > 0) {
+        if (\count($classDescription->{'group-sequence-provider'}) > 0) {
             $metadata->setGroupSequenceProvider(true);
         }
 
         foreach ($classDescription->{'group-sequence'} as $groupSequence) {
-            if (count($groupSequence->value) > 0) {
+            if (\count($groupSequence->value) > 0) {
                 $metadata->setGroupSequence($this->parseValues($groupSequence[0]->value));
             }
         }
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
index e5e84c38c35d..54e969c022e2 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
@@ -83,16 +83,16 @@ protected function parseNodes(array $nodes)
         $values = array();
 
         foreach ($nodes as $name => $childNodes) {
-            if (is_numeric($name) && is_array($childNodes) && 1 === count($childNodes)) {
+            if (is_numeric($name) && \is_array($childNodes) && 1 === \count($childNodes)) {
                 $options = current($childNodes);
 
-                if (is_array($options)) {
+                if (\is_array($options)) {
                     $options = $this->parseNodes($options);
                 }
 
                 $values[] = $this->newConstraint(key($childNodes), $options);
             } else {
-                if (is_array($childNodes)) {
+                if (\is_array($childNodes)) {
                     $childNodes = $this->parseNodes($childNodes);
                 }
 
@@ -127,7 +127,7 @@ private function parseFile($path)
         }
 
         // not an array
-        if (!is_array($classes)) {
+        if (!\is_array($classes)) {
             throw new \InvalidArgumentException(sprintf('The file "%s" must contain a YAML array.', $this->file));
         }
 
@@ -163,13 +163,13 @@ private function loadClassMetadataFromYaml(ClassMetadata $metadata, array $class
             $metadata->setGroupSequence($classDescription['group_sequence']);
         }
 
-        if (isset($classDescription['constraints']) && is_array($classDescription['constraints'])) {
+        if (isset($classDescription['constraints']) && \is_array($classDescription['constraints'])) {
             foreach ($this->parseNodes($classDescription['constraints']) as $constraint) {
                 $metadata->addConstraint($constraint);
             }
         }
 
-        if (isset($classDescription['properties']) && is_array($classDescription['properties'])) {
+        if (isset($classDescription['properties']) && \is_array($classDescription['properties'])) {
             foreach ($classDescription['properties'] as $property => $constraints) {
                 if (null !== $constraints) {
                     foreach ($this->parseNodes($constraints) as $constraint) {
@@ -179,7 +179,7 @@ private function loadClassMetadataFromYaml(ClassMetadata $metadata, array $class
             }
         }
 
-        if (isset($classDescription['getters']) && is_array($classDescription['getters'])) {
+        if (isset($classDescription['getters']) && \is_array($classDescription['getters'])) {
             foreach ($classDescription['getters'] as $getter => $constraints) {
                 if (null !== $constraints) {
                     foreach ($this->parseNodes($constraints) as $constraint) {
diff --git a/src/Symfony/Component/Validator/Mapping/MemberMetadata.php b/src/Symfony/Component/Validator/Mapping/MemberMetadata.php
index 6d303e1ee8cb..d4621cb7dd82 100644
--- a/src/Symfony/Component/Validator/Mapping/MemberMetadata.php
+++ b/src/Symfony/Component/Validator/Mapping/MemberMetadata.php
@@ -71,10 +71,10 @@ public function __construct(string $class, string $name, string $property)
      */
     public function addConstraint(Constraint $constraint)
     {
-        if (!in_array(Constraint::PROPERTY_CONSTRAINT, (array) $constraint->getTargets())) {
+        if (!\in_array(Constraint::PROPERTY_CONSTRAINT, (array) $constraint->getTargets())) {
             throw new ConstraintDefinitionException(sprintf(
                 'The constraint %s cannot be put on properties or getters',
-                get_class($constraint)
+                \get_class($constraint)
             ));
         }
 
@@ -166,7 +166,7 @@ public function isPrivate($objectOrClassName)
      */
     public function getReflectionMember($objectOrClassName)
     {
-        $className = is_string($objectOrClassName) ? $objectOrClassName : get_class($objectOrClassName);
+        $className = \is_string($objectOrClassName) ? $objectOrClassName : \get_class($objectOrClassName);
         if (!isset($this->reflMember[$className])) {
             $this->reflMember[$className] = $this->newReflectionMember($objectOrClassName);
         }
diff --git a/src/Symfony/Component/Validator/Mapping/PropertyMetadata.php b/src/Symfony/Component/Validator/Mapping/PropertyMetadata.php
index f15ca30884d7..74ecf02cf39c 100644
--- a/src/Symfony/Component/Validator/Mapping/PropertyMetadata.php
+++ b/src/Symfony/Component/Validator/Mapping/PropertyMetadata.php
@@ -56,7 +56,7 @@ public function getPropertyValue($object)
      */
     protected function newReflectionMember($objectOrClassName)
     {
-        $originalClass = is_string($objectOrClassName) ? $objectOrClassName : get_class($objectOrClassName);
+        $originalClass = \is_string($objectOrClassName) ? $objectOrClassName : \get_class($objectOrClassName);
 
         while (!property_exists($objectOrClassName, $this->getName())) {
             $objectOrClassName = get_parent_class($objectOrClassName);
diff --git a/src/Symfony/Component/Validator/Resources/translations/validators.uk.xlf b/src/Symfony/Component/Validator/Resources/translations/validators.uk.xlf
index 1a734710a63b..6a92801c9b47 100644
--- a/src/Symfony/Component/Validator/Resources/translations/validators.uk.xlf
+++ b/src/Symfony/Component/Validator/Resources/translations/validators.uk.xlf
@@ -278,6 +278,42 @@
                 <source>This value should not be identical to {{ compared_value_type }} {{ compared_value }}.</source>
                 <target>Значення не повинно бути ідентичним {{ compared_value_type }} {{ compared_value }}.</target>
             </trans-unit>
+            <trans-unit id="73">
+                <source>The image ratio is too big ({{ ratio }}). Allowed maximum ratio is {{ max_ratio }}.</source>
+                <target>Співвідношення сторін зображення занадто велике ({{ ratio }}). Максимальне співвідношення сторін {{ max_ratio }}.</target>
+            </trans-unit>
+            <trans-unit id="74">
+                <source>The image ratio is too small ({{ ratio }}). Minimum ratio expected is {{ min_ratio }}.</source>
+                <target>Співвідношення сторін зображення занадто мало ({{ ratio }}). Мінімальне співвідношення сторін {{ min_ratio }}.</target>
+            </trans-unit>
+            <trans-unit id="75">
+                <source>The image is square ({{ width }}x{{ height }}px). Square images are not allowed.</source>
+                <target>Зображення квадратне ({{ width }}x{{ height }}px). Квадратні зображення не дозволені.</target>
+            </trans-unit>
+            <trans-unit id="76">
+                <source>The image is landscape oriented ({{ width }}x{{ height }}px). Landscape oriented images are not allowed.</source>
+                <target>Зображення альбомної орієнтації ({{ width }}x{{ height }}px). Зображення альбомної орієнтації не дозволені.</target>
+            </trans-unit>
+            <trans-unit id="77">
+                <source>The image is portrait oriented ({{ width }}x{{ height }}px). Portrait oriented images are not allowed.</source>
+                <target>Зображення в портретній орієнтації ({{ width }}x{{ height }}px). Зображення в портретної орієнтації не дозволені.</target>
+            </trans-unit>
+            <trans-unit id="78">
+                <source>An empty file is not allowed.</source>
+                <target>Порожні файли не дозволені.</target>
+            </trans-unit>
+            <trans-unit id="79">
+                <source>The host could not be resolved.</source>
+                <target>Ім'я хоста не знайдено.</target>
+            </trans-unit>
+            <trans-unit id="80">
+                <source>This value does not match the expected {{ charset }} charset.</source>
+                <target>Значення не збігається з очікуваним {{ charset }} кодуванням.</target>
+            </trans-unit>
+            <trans-unit id="81">
+                <source>This is not a valid Business Identifier Code (BIC).</source>
+                <target>Це не дійсний банківський код (BIC).</target>
+            </trans-unit>
             <trans-unit id="82">
                 <source>Error</source>
                 <target>Помилка</target>
diff --git a/src/Symfony/Component/Validator/Test/ConstraintValidatorTestCase.php b/src/Symfony/Component/Validator/Test/ConstraintValidatorTestCase.php
index 8e3b2a9f791b..087a90a1850d 100644
--- a/src/Symfony/Component/Validator/Test/ConstraintValidatorTestCase.php
+++ b/src/Symfony/Component/Validator/Test/ConstraintValidatorTestCase.php
@@ -121,8 +121,8 @@ protected function setGroup($group)
     protected function setObject($object)
     {
         $this->object = $object;
-        $this->metadata = is_object($object)
-            ? new ClassMetadata(get_class($object))
+        $this->metadata = \is_object($object)
+            ? new ClassMetadata(\get_class($object))
             : null;
 
         $this->context->setNode($this->value, $this->object, $this->metadata, $this->propertyPath);
@@ -131,8 +131,8 @@ protected function setObject($object)
     protected function setProperty($object, $property)
     {
         $this->object = $object;
-        $this->metadata = is_object($object)
-            ? new PropertyMetadata(get_class($object), $property)
+        $this->metadata = \is_object($object)
+            ? new PropertyMetadata(\get_class($object), $property)
             : null;
 
         $this->context->setNode($this->value, $this->object, $this->metadata, $this->propertyPath);
@@ -192,7 +192,7 @@ protected function expectValidateValueAt($i, $propertyPath, $value, $constraints
 
     protected function assertNoViolation()
     {
-        $this->assertSame(0, $violationsCount = count($this->context->getViolations()), sprintf('0 violation expected. Got %u.', $violationsCount));
+        $this->assertSame(0, $violationsCount = \count($this->context->getViolations()), sprintf('0 violation expected. Got %u.', $violationsCount));
     }
 
     /**
@@ -314,7 +314,7 @@ public function assertRaised()
 
         $violations = iterator_to_array($this->context->getViolations());
 
-        Assert::assertSame($expectedCount = count($expected), $violationsCount = count($violations), sprintf('%u violation(s) expected. Got %u.', $expectedCount, $violationsCount));
+        Assert::assertSame($expectedCount = \count($expected), $violationsCount = \count($violations), sprintf('%u violation(s) expected. Got %u.', $expectedCount, $violationsCount));
 
         reset($violations);
 
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php b/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php
index 93898bc6ec89..5e9f2bceafcd 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php
@@ -179,9 +179,9 @@ public function testInvalidValuePath()
 
         if (method_exists($this, 'expectException')) {
             $this->expectException(ConstraintDefinitionException::class);
-            $this->expectExceptionMessage(sprintf('Invalid property path "foo" provided to "%s" constraint', get_class($constraint)));
+            $this->expectExceptionMessage(sprintf('Invalid property path "foo" provided to "%s" constraint', \get_class($constraint)));
         } else {
-            $this->setExpectedException(ConstraintDefinitionException::class, sprintf('Invalid property path "foo" provided to "%s" constraint', get_class($constraint)));
+            $this->setExpectedException(ConstraintDefinitionException::class, sprintf('Invalid property path "foo" provided to "%s" constraint', \get_class($constraint)));
         }
 
         $object = new ComparisonTest_Class(5);
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/BicValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/BicValidatorTest.php
index 52f27ddac615..5d21b93ced70 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/BicValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/BicValidatorTest.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Validator\Tests\Constraints;
 
-use Symfony\Component\Validator\Constraints\BicValidator;
 use Symfony\Component\Validator\Constraints\Bic;
+use Symfony\Component\Validator\Constraints\BicValidator;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
 
 class BicValidatorTest extends ConstraintValidatorTestCase
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/CardSchemeValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/CardSchemeValidatorTest.php
index 40c0ce43cfb9..b0280713d528 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/CardSchemeValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/CardSchemeValidatorTest.php
@@ -59,7 +59,7 @@ public function testInvalidNumbers($scheme, $number, $code)
         $this->validator->validate($number, $constraint);
 
         $this->buildViolation('myMessage')
-            ->setParameter('{{ value }}', is_string($number) ? '"'.$number.'"' : $number)
+            ->setParameter('{{ value }}', \is_string($number) ? '"'.$number.'"' : $number)
             ->setCode($code)
             ->assertRaised();
     }
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/CountValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/CountValidatorTest.php
index c9d68ee3130e..d23188a09821 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/CountValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/CountValidatorTest.php
@@ -115,7 +115,7 @@ public function testTooManyValues($value)
         $this->validator->validate($value, $constraint);
 
         $this->buildViolation('myMessage')
-            ->setParameter('{{ count }}', count($value))
+            ->setParameter('{{ count }}', \count($value))
             ->setParameter('{{ limit }}', 4)
             ->setInvalidValue($value)
             ->setPlural(4)
@@ -136,7 +136,7 @@ public function testTooFewValues($value)
         $this->validator->validate($value, $constraint);
 
         $this->buildViolation('myMessage')
-            ->setParameter('{{ count }}', count($value))
+            ->setParameter('{{ count }}', \count($value))
             ->setParameter('{{ limit }}', 4)
             ->setInvalidValue($value)
             ->setPlural(4)
@@ -158,7 +158,7 @@ public function testTooManyValuesExact($value)
         $this->validator->validate($value, $constraint);
 
         $this->buildViolation('myMessage')
-            ->setParameter('{{ count }}', count($value))
+            ->setParameter('{{ count }}', \count($value))
             ->setParameter('{{ limit }}', 4)
             ->setInvalidValue($value)
             ->setPlural(4)
@@ -180,7 +180,7 @@ public function testTooFewValuesExact($value)
         $this->validator->validate($value, $constraint);
 
         $this->buildViolation('myMessage')
-            ->setParameter('{{ count }}', count($value))
+            ->setParameter('{{ count }}', \count($value))
             ->setParameter('{{ limit }}', 4)
             ->setInvalidValue($value)
             ->setPlural(4)
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php
index 94857c178417..ff6d5c466c36 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php
@@ -152,10 +152,10 @@ public function getInvalidEmailsForStrictChecks()
             array('"test""test"@iana.org'),
             array('"test"."test"@iana.org'),
             array('"test".test@iana.org'),
-            array('"test"'.chr(0).'@iana.org'),
+            array('"test"'.\chr(0).'@iana.org'),
             array('"test\"@iana.org'),
-            array(chr(226).'@iana.org'),
-            array('test@'.chr(226).'.org'),
+            array(\chr(226).'@iana.org'),
+            array('test@'.\chr(226).'.org'),
             array('\r\ntest@iana.org'),
             array('\r\n test@iana.org'),
             array('\r\n \r\ntest@iana.org'),
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/FileValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/FileValidatorTest.php
index 4cf62a621550..3db3302ac2c9 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/FileValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/FileValidatorTest.php
@@ -31,7 +31,7 @@ protected function setUp()
     {
         parent::setUp();
 
-        $this->path = sys_get_temp_dir().DIRECTORY_SEPARATOR.'FileValidatorTest';
+        $this->path = sys_get_temp_dir().\DIRECTORY_SEPARATOR.'FileValidatorTest';
         $this->file = fopen($this->path, 'w');
         fwrite($this->file, ' ', 1);
     }
@@ -40,7 +40,7 @@ protected function tearDown()
     {
         parent::tearDown();
 
-        if (is_resource($this->file)) {
+        if (\is_resource($this->file)) {
             fclose($this->file);
         }
 
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/ImageValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/ImageValidatorTest.php
index 05ab7e2f8843..9d80f88d89df 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/ImageValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/ImageValidatorTest.php
@@ -389,7 +389,7 @@ public function testPortraitNotAllowed()
 
     public function testCorrupted()
     {
-        if (!function_exists('imagecreatefromstring')) {
+        if (!\function_exists('imagecreatefromstring')) {
             $this->markTestSkipped('This test require GD extension');
         }
 
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/IsbnValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/IsbnValidatorTest.php
index 344edb99f370..f810fc9820ae 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/IsbnValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/IsbnValidatorTest.php
@@ -60,7 +60,7 @@ public function getInvalidIsbn10()
             array('1A34567890', Isbn::INVALID_CHARACTERS_ERROR),
             // chr(1) evaluates to 0
             // 2070546810 is valid
-            array('2'.chr(1).'70546810', Isbn::INVALID_CHARACTERS_ERROR),
+            array('2'.\chr(1).'70546810', Isbn::INVALID_CHARACTERS_ERROR),
         );
     }
 
@@ -98,7 +98,7 @@ public function getInvalidIsbn13()
             array('978-272C442282', Isbn::INVALID_CHARACTERS_ERROR),
             // chr(1) evaluates to 0
             // 978-2070546817 is valid
-            array('978-2'.chr(1).'70546817', Isbn::INVALID_CHARACTERS_ERROR),
+            array('978-2'.\chr(1).'70546817', Isbn::INVALID_CHARACTERS_ERROR),
         );
     }
 
diff --git a/src/Symfony/Component/Validator/Tests/DependencyInjection/AddConstraintValidatorsPassTest.php b/src/Symfony/Component/Validator/Tests/DependencyInjection/AddConstraintValidatorsPassTest.php
index 05167e84ca17..c47cbcc94da9 100644
--- a/src/Symfony/Component/Validator/Tests/DependencyInjection/AddConstraintValidatorsPassTest.php
+++ b/src/Symfony/Component/Validator/Tests/DependencyInjection/AddConstraintValidatorsPassTest.php
@@ -12,12 +12,12 @@
 namespace Symfony\Component\Validator\Tests\DependencyInjection;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Validator\DependencyInjection\AddConstraintValidatorsPass;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceLocator;
+use Symfony\Component\Validator\DependencyInjection\AddConstraintValidatorsPass;
 
 class AddConstraintValidatorsPassTest extends TestCase
 {
@@ -65,8 +65,8 @@ public function testThatCompilerPassIsIgnoredIfThereIsNoConstraintValidatorFacto
     {
         $container = new ContainerBuilder();
 
-        $definitionsBefore = count($container->getDefinitions());
-        $aliasesBefore = count($container->getAliases());
+        $definitionsBefore = \count($container->getDefinitions());
+        $aliasesBefore = \count($container->getAliases());
 
         $addConstraintValidatorsPass = new AddConstraintValidatorsPass();
         $addConstraintValidatorsPass->process($container);
diff --git a/src/Symfony/Component/Validator/Tests/Fixtures/Countable.php b/src/Symfony/Component/Validator/Tests/Fixtures/Countable.php
index 282d78d45a67..afc42376a254 100644
--- a/src/Symfony/Component/Validator/Tests/Fixtures/Countable.php
+++ b/src/Symfony/Component/Validator/Tests/Fixtures/Countable.php
@@ -22,6 +22,6 @@ public function __construct(array $content)
 
     public function count()
     {
-        return count($this->content);
+        return \count($this->content);
     }
 }
diff --git a/src/Symfony/Component/Validator/Tests/Fixtures/CustomArrayObject.php b/src/Symfony/Component/Validator/Tests/Fixtures/CustomArrayObject.php
index 41eac961acf9..feb25318eb5e 100644
--- a/src/Symfony/Component/Validator/Tests/Fixtures/CustomArrayObject.php
+++ b/src/Symfony/Component/Validator/Tests/Fixtures/CustomArrayObject.php
@@ -55,7 +55,7 @@ public function getIterator()
 
     public function count()
     {
-        return count($this->array);
+        return \count($this->array);
     }
 
     public function serialize()
diff --git a/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticCar.php b/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticCar.php
index 38c82982b143..0b384872db59 100644
--- a/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticCar.php
+++ b/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticCar.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Validator\Tests\Fixtures;
 
-use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Constraints\Length;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
 
 class EntityStaticCar extends EntityStaticVehicle
 {
diff --git a/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticCarTurbo.php b/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticCarTurbo.php
index 83f192e7bd00..abf1edbdd132 100644
--- a/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticCarTurbo.php
+++ b/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticCarTurbo.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Validator\Tests\Fixtures;
 
-use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Constraints\Length;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
 
 class EntityStaticCarTurbo extends EntityStaticCar
 {
diff --git a/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticVehicle.php b/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticVehicle.php
index 41e616b03f43..9ce72935de51 100644
--- a/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticVehicle.php
+++ b/src/Symfony/Component/Validator/Tests/Fixtures/EntityStaticVehicle.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Validator\Tests\Fixtures;
 
-use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Constraints\Length;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
 
 class EntityStaticVehicle
 {
diff --git a/src/Symfony/Component/Validator/Tests/Fixtures/FakeMetadataFactory.php b/src/Symfony/Component/Validator/Tests/Fixtures/FakeMetadataFactory.php
index 98aa57ce8024..1b5a704d4680 100644
--- a/src/Symfony/Component/Validator/Tests/Fixtures/FakeMetadataFactory.php
+++ b/src/Symfony/Component/Validator/Tests/Fixtures/FakeMetadataFactory.php
@@ -23,13 +23,13 @@ public function getMetadataFor($class)
     {
         $hash = null;
 
-        if (is_object($class)) {
+        if (\is_object($class)) {
             $hash = spl_object_hash($class);
-            $class = get_class($class);
+            $class = \get_class($class);
         }
 
-        if (!is_string($class)) {
-            throw new NoSuchMetadataException(sprintf('No metadata for type %s', gettype($class)));
+        if (!\is_string($class)) {
+            throw new NoSuchMetadataException(sprintf('No metadata for type %s', \gettype($class)));
         }
 
         if (!isset($this->metadatas[$class])) {
@@ -47,12 +47,12 @@ public function hasMetadataFor($class)
     {
         $hash = null;
 
-        if (is_object($class)) {
+        if (\is_object($class)) {
             $hash = spl_object_hash($class);
-            $class = get_class($class);
+            $class = \get_class($class);
         }
 
-        if (!is_string($class)) {
+        if (!\is_string($class)) {
             return false;
         }
 
@@ -66,7 +66,7 @@ public function addMetadata($metadata)
 
     public function addMetadataForValue($value, MetadataInterface $metadata)
     {
-        $key = is_object($value) ? spl_object_hash($value) : $value;
+        $key = \is_object($value) ? spl_object_hash($value) : $value;
         $this->metadatas[$key] = $metadata;
     }
 }
diff --git a/src/Symfony/Component/Validator/Tests/Mapping/Loader/AnnotationLoaderTest.php b/src/Symfony/Component/Validator/Tests/Mapping/Loader/AnnotationLoaderTest.php
index 5765a838d137..783e9b27d850 100644
--- a/src/Symfony/Component/Validator/Tests/Mapping/Loader/AnnotationLoaderTest.php
+++ b/src/Symfony/Component/Validator/Tests/Mapping/Loader/AnnotationLoaderTest.php
@@ -17,9 +17,9 @@
 use Symfony\Component\Validator\Constraints\Callback;
 use Symfony\Component\Validator\Constraints\Choice;
 use Symfony\Component\Validator\Constraints\Collection;
+use Symfony\Component\Validator\Constraints\IsTrue;
 use Symfony\Component\Validator\Constraints\NotNull;
 use Symfony\Component\Validator\Constraints\Range;
-use Symfony\Component\Validator\Constraints\IsTrue;
 use Symfony\Component\Validator\Constraints\Valid;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Mapping\Loader\AnnotationLoader;
diff --git a/src/Symfony/Component/Validator/Tests/Mapping/Loader/XmlFileLoaderTest.php b/src/Symfony/Component/Validator/Tests/Mapping/Loader/XmlFileLoaderTest.php
index 20dc80ed069b..100e4fa062fc 100644
--- a/src/Symfony/Component/Validator/Tests/Mapping/Loader/XmlFileLoaderTest.php
+++ b/src/Symfony/Component/Validator/Tests/Mapping/Loader/XmlFileLoaderTest.php
@@ -16,10 +16,10 @@
 use Symfony\Component\Validator\Constraints\Callback;
 use Symfony\Component\Validator\Constraints\Choice;
 use Symfony\Component\Validator\Constraints\Collection;
+use Symfony\Component\Validator\Constraints\IsTrue;
 use Symfony\Component\Validator\Constraints\NotNull;
 use Symfony\Component\Validator\Constraints\Range;
 use Symfony\Component\Validator\Constraints\Regex;
-use Symfony\Component\Validator\Constraints\IsTrue;
 use Symfony\Component\Validator\Constraints\Traverse;
 use Symfony\Component\Validator\Exception\MappingException;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
diff --git a/src/Symfony/Component/Validator/Tests/Mapping/Loader/YamlFileLoaderTest.php b/src/Symfony/Component/Validator/Tests/Mapping/Loader/YamlFileLoaderTest.php
index 38861b377f2c..9920fb0737ae 100644
--- a/src/Symfony/Component/Validator/Tests/Mapping/Loader/YamlFileLoaderTest.php
+++ b/src/Symfony/Component/Validator/Tests/Mapping/Loader/YamlFileLoaderTest.php
@@ -16,9 +16,9 @@
 use Symfony\Component\Validator\Constraints\Callback;
 use Symfony\Component\Validator\Constraints\Choice;
 use Symfony\Component\Validator\Constraints\Collection;
+use Symfony\Component\Validator\Constraints\IsTrue;
 use Symfony\Component\Validator\Constraints\NotNull;
 use Symfony\Component\Validator\Constraints\Range;
-use Symfony\Component\Validator\Constraints\IsTrue;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Mapping\Loader\YamlFileLoader;
 use Symfony\Component\Validator\Tests\Fixtures\ConstraintA;
diff --git a/src/Symfony/Component/Validator/Tests/Resources/TranslationFilesTest.php b/src/Symfony/Component/Validator/Tests/Resources/TranslationFilesTest.php
index d2b8a9901172..64b3f78934f1 100644
--- a/src/Symfony/Component/Validator/Tests/Resources/TranslationFilesTest.php
+++ b/src/Symfony/Component/Validator/Tests/Resources/TranslationFilesTest.php
@@ -33,15 +33,15 @@ public function provideTranslationFiles()
     {
         return array_map(
             function ($filePath) { return (array) $filePath; },
-            glob(dirname(dirname(__DIR__)).'/Resources/translations/*.xlf')
+            glob(\dirname(\dirname(__DIR__)).'/Resources/translations/*.xlf')
         );
     }
 
     public function testNorwegianAlias()
     {
         $this->assertFileEquals(
-            dirname(dirname(__DIR__)).'/Resources/translations/validators.nb.xlf',
-            dirname(dirname(__DIR__)).'/Resources/translations/validators.no.xlf',
+            \dirname(\dirname(__DIR__)).'/Resources/translations/validators.nb.xlf',
+            \dirname(\dirname(__DIR__)).'/Resources/translations/validators.no.xlf',
             'The NO locale should be an alias for the NB variant of the Norwegian language.'
         );
     }
diff --git a/src/Symfony/Component/Validator/Tests/Validator/AbstractValidatorTest.php b/src/Symfony/Component/Validator/Tests/Validator/AbstractValidatorTest.php
index 360d84f98516..7d303ce8a543 100644
--- a/src/Symfony/Component/Validator/Tests/Validator/AbstractValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Validator/AbstractValidatorTest.php
@@ -1172,7 +1172,7 @@ public function testReplaceDefaultGroup($sequence, array $assertViolations)
             $context->addViolation('Violation in Group 3');
         };
 
-        $metadata = new ClassMetadata(get_class($entity));
+        $metadata = new ClassMetadata(\get_class($entity));
         $metadata->addConstraint(new Callback(array(
             'callback' => function () {},
             'groups' => 'Group 1',
@@ -1192,7 +1192,7 @@ public function testReplaceDefaultGroup($sequence, array $assertViolations)
         $violations = $this->validate($entity, null, 'Default');
 
         /* @var ConstraintViolationInterface[] $violations */
-        $this->assertCount(count($assertViolations), $violations);
+        $this->assertCount(\count($assertViolations), $violations);
         foreach ($assertViolations as $key => $message) {
             $this->assertSame($message, $violations[$key]->getMessage());
         }
diff --git a/src/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php b/src/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
index d1166ad913d6..eb1835c88a44 100644
--- a/src/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
+++ b/src/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
@@ -23,11 +23,11 @@
 use Symfony\Component\Validator\Exception\ValidatorException;
 use Symfony\Component\Validator\Mapping\CascadingStrategy;
 use Symfony\Component\Validator\Mapping\ClassMetadataInterface;
+use Symfony\Component\Validator\Mapping\Factory\MetadataFactoryInterface;
 use Symfony\Component\Validator\Mapping\GenericMetadata;
 use Symfony\Component\Validator\Mapping\MetadataInterface;
 use Symfony\Component\Validator\Mapping\PropertyMetadataInterface;
 use Symfony\Component\Validator\Mapping\TraversalStrategy;
-use Symfony\Component\Validator\Mapping\Factory\MetadataFactoryInterface;
 use Symfony\Component\Validator\ObjectInitializerInterface;
 use Symfony\Component\Validator\Util\PropertyPath;
 
@@ -99,7 +99,7 @@ public function validate($value, $constraints = null, $groups = null)
         if (null !== $constraints) {
             // You can pass a single constraint or an array of constraints
             // Make sure to deal with an array in the rest of the code
-            if (!is_array($constraints)) {
+            if (!\is_array($constraints)) {
                 $constraints = array($constraints);
             }
 
@@ -109,7 +109,7 @@ public function validate($value, $constraints = null, $groups = null)
             $this->validateGenericNode(
                 $value,
                 $previousObject,
-                is_object($value) ? spl_object_hash($value) : null,
+                \is_object($value) ? spl_object_hash($value) : null,
                 $metadata,
                 $this->defaultPropertyPath,
                 $groups,
@@ -130,7 +130,7 @@ public function validate($value, $constraints = null, $groups = null)
 
         // If an object is passed without explicit constraints, validate that
         // object against the constraints defined for the object's class
-        if (is_object($value)) {
+        if (\is_object($value)) {
             $this->validateObject(
                 $value,
                 $this->defaultPropertyPath,
@@ -147,7 +147,7 @@ public function validate($value, $constraints = null, $groups = null)
 
         // If an array is passed without explicit constraints, validate each
         // object in the array
-        if (is_array($value)) {
+        if (\is_array($value)) {
             $this->validateEachObjectIn(
                 $value,
                 $this->defaultPropertyPath,
@@ -164,7 +164,7 @@ public function validate($value, $constraints = null, $groups = null)
         throw new RuntimeException(sprintf(
             'Cannot validate values of type "%s" automatically. Please '.
             'provide a constraint.',
-            gettype($value)
+            \gettype($value)
         ));
     }
 
@@ -180,7 +180,7 @@ public function validateProperty($object, $propertyName, $groups = null)
                 'The metadata factory should return instances of '.
                 '"\Symfony\Component\Validator\Mapping\ClassMetadataInterface", '.
                 'got: "%s".',
-                is_object($classMetadata) ? get_class($classMetadata) : gettype($classMetadata)
+                \is_object($classMetadata) ? \get_class($classMetadata) : \gettype($classMetadata)
             ));
         }
 
@@ -201,7 +201,7 @@ public function validateProperty($object, $propertyName, $groups = null)
             $this->validateGenericNode(
                 $propertyValue,
                 $object,
-                $cacheKey.':'.get_class($object).':'.$propertyName,
+                $cacheKey.':'.\get_class($object).':'.$propertyName,
                 $propertyMetadata,
                 $propertyPath,
                 $groups,
@@ -229,16 +229,16 @@ public function validatePropertyValue($objectOrClass, $propertyName, $value, $gr
                 'The metadata factory should return instances of '.
                 '"\Symfony\Component\Validator\Mapping\ClassMetadataInterface", '.
                 'got: "%s".',
-                is_object($classMetadata) ? get_class($classMetadata) : gettype($classMetadata)
+                \is_object($classMetadata) ? \get_class($classMetadata) : \gettype($classMetadata)
             ));
         }
 
         $propertyMetadatas = $classMetadata->getPropertyMetadata($propertyName);
         $groups = $groups ? $this->normalizeGroups($groups) : $this->defaultGroups;
 
-        if (is_object($objectOrClass)) {
+        if (\is_object($objectOrClass)) {
             $object = $objectOrClass;
-            $class = get_class($object);
+            $class = \get_class($object);
             $cacheKey = spl_object_hash($objectOrClass);
             $propertyPath = PropertyPath::append($this->defaultPropertyPath, $propertyName);
         } else {
@@ -292,7 +292,7 @@ public function getViolations()
      */
     protected function normalizeGroups($groups)
     {
-        if (is_array($groups)) {
+        if (\is_array($groups)) {
             return $groups;
         }
 
@@ -332,7 +332,7 @@ private function validateObject($object, $propertyPath, array $groups, $traversa
                     'The metadata factory should return instances of '.
                     '"Symfony\Component\Validator\Mapping\ClassMetadataInterface", '.
                     'got: "%s".',
-                    is_object($classMetadata) ? get_class($classMetadata) : gettype($classMetadata)
+                    \is_object($classMetadata) ? \get_class($classMetadata) : \gettype($classMetadata)
                 ));
             }
 
@@ -385,7 +385,7 @@ private function validateObject($object, $propertyPath, array $groups, $traversa
     private function validateEachObjectIn($collection, $propertyPath, array $groups, ExecutionContextInterface $context)
     {
         foreach ($collection as $key => $value) {
-            if (is_array($value)) {
+            if (\is_array($value)) {
                 // Arrays are always cascaded, independent of the specified
                 // traversal strategy
                 $this->validateEachObjectIn(
@@ -399,7 +399,7 @@ private function validateEachObjectIn($collection, $propertyPath, array $groups,
             }
 
             // Scalar and null values in the collection are ignored
-            if (is_object($value)) {
+            if (\is_object($value)) {
                 $this->validateObject(
                     $value,
                     $propertyPath.'['.$key.']',
@@ -479,7 +479,7 @@ private function validateClassNode($object, $cacheKey, ClassMetadataInterface $m
             $defaultOverridden = false;
 
             // Use the object hash for group sequences
-            $groupHash = is_object($group) ? spl_object_hash($group) : $group;
+            $groupHash = \is_object($group) ? spl_object_hash($group) : $group;
 
             if ($context->isGroupValidated($cacheKey, $groupHash)) {
                 // Skip this group when validating the properties and when
@@ -544,7 +544,7 @@ private function validateClassNode($object, $cacheKey, ClassMetadataInterface $m
 
         // If no more groups should be validated for the property nodes,
         // we can safely quit
-        if (0 === count($groups)) {
+        if (0 === \count($groups)) {
             return;
         }
 
@@ -559,7 +559,7 @@ private function validateClassNode($object, $cacheKey, ClassMetadataInterface $m
                         'The property metadata instances should implement '.
                         '"Symfony\Component\Validator\Mapping\PropertyMetadataInterface", '.
                         'got: "%s".',
-                        is_object($propertyMetadata) ? get_class($propertyMetadata) : gettype($propertyMetadata)
+                        \is_object($propertyMetadata) ? \get_class($propertyMetadata) : \gettype($propertyMetadata)
                     ));
                 }
 
@@ -568,7 +568,7 @@ private function validateClassNode($object, $cacheKey, ClassMetadataInterface $m
                 $this->validateGenericNode(
                     $propertyValue,
                     $object,
-                    $cacheKey.':'.get_class($object).':'.$propertyName,
+                    $cacheKey.':'.\get_class($object).':'.$propertyName,
                     $propertyMetadata,
                     PropertyPath::append($propertyPath, $propertyName),
                     $groups,
@@ -600,7 +600,7 @@ private function validateClassNode($object, $cacheKey, ClassMetadataInterface $m
             throw new ConstraintDefinitionException(sprintf(
                 'Traversal was enabled for "%s", but this class '.
                 'does not implement "\Traversable".',
-                get_class($object)
+                \get_class($object)
             ));
         }
 
@@ -675,7 +675,7 @@ private function validateGenericNode($value, $object, $cacheKey, MetadataInterfa
             $this->validateInGroup($value, $cacheKey, $metadata, $group, $context);
         }
 
-        if (0 === count($groups)) {
+        if (0 === \count($groups)) {
             return;
         }
 
@@ -686,7 +686,7 @@ private function validateGenericNode($value, $object, $cacheKey, MetadataInterfa
         $cascadingStrategy = $metadata->getCascadingStrategy();
 
         // Quit unless we have an array or a cascaded object
-        if (!is_array($value) && !($cascadingStrategy & CascadingStrategy::CASCADE)) {
+        if (!\is_array($value) && !($cascadingStrategy & CascadingStrategy::CASCADE)) {
             return;
         }
 
@@ -699,9 +699,9 @@ private function validateGenericNode($value, $object, $cacheKey, MetadataInterfa
         // The $cascadedGroups property is set, if the "Default" group is
         // overridden by a group sequence
         // See validateClassNode()
-        $cascadedGroups = null !== $cascadedGroups && count($cascadedGroups) > 0 ? $cascadedGroups : $groups;
+        $cascadedGroups = null !== $cascadedGroups && \count($cascadedGroups) > 0 ? $cascadedGroups : $groups;
 
-        if (is_array($value)) {
+        if (\is_array($value)) {
             // Arrays are always traversed, independent of the specified
             // traversal strategy
             $this->validateEachObjectIn(
@@ -757,7 +757,7 @@ private function validateGenericNode($value, $object, $cacheKey, MetadataInterfa
      */
     private function stepThroughGroupSequence($value, $object, $cacheKey, MetadataInterface $metadata = null, $propertyPath, $traversalStrategy, GroupSequence $groupSequence, $cascadedGroup, ExecutionContextInterface $context)
     {
-        $violationCount = count($context->getViolations());
+        $violationCount = \count($context->getViolations());
         $cascadedGroups = $cascadedGroup ? array($cascadedGroup) : null;
 
         foreach ($groupSequence->groups as $groupInSequence) {
@@ -789,7 +789,7 @@ private function stepThroughGroupSequence($value, $object, $cacheKey, MetadataIn
             }
 
             // Abort sequence validation if a violation was generated
-            if (count($context->getViolations()) > $violationCount) {
+            if (\count($context->getViolations()) > $violationCount) {
                 break;
             }
         }
diff --git a/src/Symfony/Component/Validator/Validator/RecursiveValidator.php b/src/Symfony/Component/Validator/Validator/RecursiveValidator.php
index 8763f2e66847..33c2ec9e4798 100644
--- a/src/Symfony/Component/Validator/Validator/RecursiveValidator.php
+++ b/src/Symfony/Component/Validator/Validator/RecursiveValidator.php
@@ -117,7 +117,7 @@ public function validateProperty($object, $propertyName, $groups = null)
     public function validatePropertyValue($objectOrClass, $propertyName, $value, $groups = null)
     {
         // If a class name is passed, take $value as root
-        return $this->startContext(is_object($objectOrClass) ? $objectOrClass : $value)
+        return $this->startContext(\is_object($objectOrClass) ? $objectOrClass : $value)
             ->validatePropertyValue($objectOrClass, $propertyName, $value, $groups)
             ->getViolations();
     }
diff --git a/src/Symfony/Component/Validator/ValidatorBuilder.php b/src/Symfony/Component/Validator/ValidatorBuilder.php
index 4268570858b9..11c5052f3b00 100644
--- a/src/Symfony/Component/Validator/ValidatorBuilder.php
+++ b/src/Symfony/Component/Validator/ValidatorBuilder.php
@@ -213,7 +213,7 @@ public function disableAnnotationMapping()
      */
     public function setMetadataFactory(MetadataFactoryInterface $metadataFactory)
     {
-        if (count($this->xmlMappings) > 0 || count($this->yamlMappings) > 0 || count($this->methodMappings) > 0 || null !== $this->annotationReader) {
+        if (\count($this->xmlMappings) > 0 || \count($this->yamlMappings) > 0 || \count($this->methodMappings) > 0 || null !== $this->annotationReader) {
             throw new ValidatorException('You cannot set a custom metadata factory after adding custom mappings. You should do either of both.');
         }
 
@@ -303,9 +303,9 @@ public function getValidator()
             $loaders = $this->getLoaders();
             $loader = null;
 
-            if (count($loaders) > 1) {
+            if (\count($loaders) > 1) {
                 $loader = new LoaderChain($loaders);
-            } elseif (1 === count($loaders)) {
+            } elseif (1 === \count($loaders)) {
                 $loader = $loaders[0];
             }
 
diff --git a/src/Symfony/Component/VarDumper/Caster/ArgsStub.php b/src/Symfony/Component/VarDumper/Caster/ArgsStub.php
index 0c53a7bfb7e1..582d15e26144 100644
--- a/src/Symfony/Component/VarDumper/Caster/ArgsStub.php
+++ b/src/Symfony/Component/VarDumper/Caster/ArgsStub.php
@@ -35,10 +35,10 @@ public function __construct(array $args, string $function, ?string $class)
 
             return;
         }
-        if (count($values) < count($params)) {
-            $params = array_slice($params, 0, count($values));
-        } elseif (count($values) > count($params)) {
-            $values[] = new EnumStub(array_splice($values, count($params)), false);
+        if (\count($values) < \count($params)) {
+            $params = \array_slice($params, 0, \count($values));
+        } elseif (\count($values) > \count($params)) {
+            $values[] = new EnumStub(array_splice($values, \count($params)), false);
             $params[] = $variadic;
         }
         if (array('...') === $params) {
diff --git a/src/Symfony/Component/VarDumper/Caster/Caster.php b/src/Symfony/Component/VarDumper/Caster/Caster.php
index 7f4e02283f58..c82ce82725cf 100644
--- a/src/Symfony/Component/VarDumper/Caster/Caster.php
+++ b/src/Symfony/Component/VarDumper/Caster/Caster.php
@@ -117,10 +117,10 @@ public static function filter(array $a, $filter, array $listedProperties = array
             } elseif (false === $v || '' === $v || '0' === $v || 0 === $v || 0.0 === $v || array() === $v) {
                 $type |= self::EXCLUDE_EMPTY & $filter;
             }
-            if ((self::EXCLUDE_NOT_IMPORTANT & $filter) && !in_array($k, $listedProperties, true)) {
+            if ((self::EXCLUDE_NOT_IMPORTANT & $filter) && !\in_array($k, $listedProperties, true)) {
                 $type |= self::EXCLUDE_NOT_IMPORTANT;
             }
-            if ((self::EXCLUDE_VERBOSE & $filter) && in_array($k, $listedProperties, true)) {
+            if ((self::EXCLUDE_VERBOSE & $filter) && \in_array($k, $listedProperties, true)) {
                 $type |= self::EXCLUDE_VERBOSE;
             }
 
diff --git a/src/Symfony/Component/VarDumper/Caster/ClassStub.php b/src/Symfony/Component/VarDumper/Caster/ClassStub.php
index 9eebae082962..b609a6edad29 100644
--- a/src/Symfony/Component/VarDumper/Caster/ClassStub.php
+++ b/src/Symfony/Component/VarDumper/Caster/ClassStub.php
@@ -27,7 +27,7 @@ public function __construct(string $identifier, $callable = null)
         $this->value = $identifier;
 
         if (0 < $i = strrpos($identifier, '\\')) {
-            $this->attr['ellipsis'] = strlen($identifier) - $i;
+            $this->attr['ellipsis'] = \strlen($identifier) - $i;
             $this->attr['ellipsis-type'] = 'class';
             $this->attr['ellipsis-tail'] = 1;
         }
@@ -36,9 +36,9 @@ public function __construct(string $identifier, $callable = null)
             if (null !== $callable) {
                 if ($callable instanceof \Closure) {
                     $r = new \ReflectionFunction($callable);
-                } elseif (is_object($callable)) {
+                } elseif (\is_object($callable)) {
                     $r = array($callable, '__invoke');
-                } elseif (is_array($callable)) {
+                } elseif (\is_array($callable)) {
                     $r = $callable;
                 } elseif (false !== $i = strpos($callable, '::')) {
                     $r = array(substr($callable, 0, $i), substr($callable, 2 + $i));
@@ -51,7 +51,7 @@ public function __construct(string $identifier, $callable = null)
                 $r = new \ReflectionClass($identifier);
             }
 
-            if (is_array($r)) {
+            if (\is_array($r)) {
                 try {
                     $r = new \ReflectionMethod($r[0], $r[1]);
                 } catch (\ReflectionException $e) {
@@ -70,13 +70,13 @@ public function __construct(string $identifier, $callable = null)
 
     public static function wrapCallable($callable)
     {
-        if (is_object($callable) || !is_callable($callable)) {
+        if (\is_object($callable) || !\is_callable($callable)) {
             return $callable;
         }
 
-        if (!is_array($callable)) {
+        if (!\is_array($callable)) {
             $callable = new static($callable);
-        } elseif (is_string($callable[0])) {
+        } elseif (\is_string($callable[0])) {
             $callable[0] = new static($callable[0]);
         } else {
             $callable[1] = new static($callable[1], $callable);
diff --git a/src/Symfony/Component/VarDumper/Caster/CutArrayStub.php b/src/Symfony/Component/VarDumper/Caster/CutArrayStub.php
index f2a803053a6c..0e4fb363d2d4 100644
--- a/src/Symfony/Component/VarDumper/Caster/CutArrayStub.php
+++ b/src/Symfony/Component/VarDumper/Caster/CutArrayStub.php
@@ -25,6 +25,6 @@ public function __construct(array $value, array $preservedKeys)
         parent::__construct($value);
 
         $this->preservedSubset = array_intersect_key($value, array_flip($preservedKeys));
-        $this->cut -= count($this->preservedSubset);
+        $this->cut -= \count($this->preservedSubset);
     }
 }
diff --git a/src/Symfony/Component/VarDumper/Caster/CutStub.php b/src/Symfony/Component/VarDumper/Caster/CutStub.php
index 61140eb361d9..690338f542d9 100644
--- a/src/Symfony/Component/VarDumper/Caster/CutStub.php
+++ b/src/Symfony/Component/VarDumper/Caster/CutStub.php
@@ -24,17 +24,17 @@ public function __construct($value)
     {
         $this->value = $value;
 
-        switch (gettype($value)) {
+        switch (\gettype($value)) {
             case 'object':
                 $this->type = self::TYPE_OBJECT;
-                $this->class = get_class($value);
+                $this->class = \get_class($value);
                 $this->cut = -1;
                 break;
 
             case 'array':
                 $this->type = self::TYPE_ARRAY;
                 $this->class = self::ARRAY_ASSOC;
-                $this->cut = $this->value = count($value);
+                $this->cut = $this->value = \count($value);
                 break;
 
             case 'resource':
@@ -51,7 +51,7 @@ public function __construct($value)
             case 'string':
                 $this->type = self::TYPE_STRING;
                 $this->class = preg_match('//u', $value) ? self::STRING_UTF8 : self::STRING_BINARY;
-                $this->cut = self::STRING_BINARY === $this->class ? strlen($value) : mb_strlen($value, 'UTF-8');
+                $this->cut = self::STRING_BINARY === $this->class ? \strlen($value) : mb_strlen($value, 'UTF-8');
                 $this->value = '';
                 break;
         }
diff --git a/src/Symfony/Component/VarDumper/Caster/DateCaster.php b/src/Symfony/Component/VarDumper/Caster/DateCaster.php
index af9ce9605592..da6a5a70d688 100644
--- a/src/Symfony/Component/VarDumper/Caster/DateCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/DateCaster.php
@@ -73,7 +73,7 @@ public static function castTimeZone(\DateTimeZone $timeZone, array $a, Stub $stu
     {
         $location = $timeZone->getLocation();
         $formatted = (new \DateTime('now', $timeZone))->format($location ? 'e (P)' : 'P');
-        $title = $location && extension_loaded('intl') ? \Locale::getDisplayRegion('-'.$location['country_code']) : '';
+        $title = $location && \extension_loaded('intl') ? \Locale::getDisplayRegion('-'.$location['country_code']) : '';
 
         $z = array(Caster::PREFIX_VIRTUAL.'timezone' => new ConstStub($formatted, $title));
 
@@ -117,6 +117,6 @@ private static function formatDateTime(\DateTimeInterface $d, $extra = '')
 
     private static function formatSeconds($s, $us)
     {
-        return sprintf('%02d.%s', $s, 0 === ($len = strlen($t = rtrim($us, '0'))) ? '0' : ($len <= 3 ? str_pad($t, 3, '0') : $us));
+        return sprintf('%02d.%s', $s, 0 === ($len = \strlen($t = rtrim($us, '0'))) ? '0' : ($len <= 3 ? str_pad($t, 3, '0') : $us));
     }
 }
diff --git a/src/Symfony/Component/VarDumper/Caster/DoctrineCaster.php b/src/Symfony/Component/VarDumper/Caster/DoctrineCaster.php
index f6573b34fd14..785d0270d7b0 100644
--- a/src/Symfony/Component/VarDumper/Caster/DoctrineCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/DoctrineCaster.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\VarDumper\Caster;
 
 use Doctrine\Common\Proxy\Proxy as CommonProxy;
-use Doctrine\ORM\Proxy\Proxy as OrmProxy;
 use Doctrine\ORM\PersistentCollection;
+use Doctrine\ORM\Proxy\Proxy as OrmProxy;
 use Symfony\Component\VarDumper\Cloner\Stub;
 
 /**
diff --git a/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php b/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
index df61aefb6f2f..49df71da7e31 100644
--- a/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/ExceptionCaster.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\VarDumper\Caster;
 
 use Symfony\Component\Debug\Exception\SilencedErrorContext;
-use Symfony\Component\VarDumper\Exception\ThrowingCasterException;
 use Symfony\Component\VarDumper\Cloner\Stub;
+use Symfony\Component\VarDumper\Exception\ThrowingCasterException;
 
 /**
  * Casts common Exception classes to array representation.
@@ -71,8 +71,8 @@ public static function castThrowingCasterException(ThrowingCasterException $e, a
 
         if (isset($a[$xPrefix.'previous'], $a[$trace]) && $a[$xPrefix.'previous'] instanceof \Exception) {
             $b = (array) $a[$xPrefix.'previous'];
-            self::traceUnshift($b[$xPrefix.'trace'], get_class($a[$xPrefix.'previous']), $b[$prefix.'file'], $b[$prefix.'line']);
-            $a[$trace] = new TraceStub($b[$xPrefix.'trace'], false, 0, -count($a[$trace]->value));
+            self::traceUnshift($b[$xPrefix.'trace'], \get_class($a[$xPrefix.'previous']), $b[$prefix.'file'], $b[$prefix.'line']);
+            $a[$trace] = new TraceStub($b[$xPrefix.'trace'], false, 0, -\count($a[$trace]->value));
         }
 
         unset($a[$xPrefix.'previous'], $a[$prefix.'code'], $a[$prefix.'file'], $a[$prefix.'line']);
@@ -118,7 +118,7 @@ public static function castTraceStub(TraceStub $trace, array $a, Stub $stub, $is
         $prefix = Caster::PREFIX_VIRTUAL;
 
         $a = array();
-        $j = count($frames);
+        $j = \count($frames);
         if (0 > $i = $trace->sliceOffset) {
             $i = max(0, $j + $i);
         }
@@ -175,7 +175,7 @@ public static function castTraceStub(TraceStub $trace, array $a, Stub $stub, $is
             $lastCall = $call;
         }
         if (null !== $trace->sliceLength) {
-            $a = array_slice($a, 0, $trace->sliceLength, true);
+            $a = \array_slice($a, 0, $trace->sliceLength, true);
         }
 
         return $a;
@@ -199,7 +199,7 @@ public static function castFrameStub(FrameStub $frame, array $a, Stub $stub, $is
                 $a[$prefix.'src'] = self::$framesCache[$cacheKey];
             } else {
                 if (preg_match('/\((\d+)\)(?:\([\da-f]{32}\))? : (?:eval\(\)\'d code|runtime-created function)$/', $f['file'], $match)) {
-                    $f['file'] = substr($f['file'], 0, -strlen($match[0]));
+                    $f['file'] = substr($f['file'], 0, -\strlen($match[0]));
                     $f['line'] = (int) $match[1];
                 }
                 $caller = isset($f['function']) ? sprintf('in %s() on line %d', (isset($f['class']) ? $f['class'].$f['type'] : '').$f['function'], $f['line']) : null;
@@ -212,7 +212,7 @@ public static function castFrameStub(FrameStub $frame, array $a, Stub $stub, $is
 
                 if (file_exists($f['file']) && 0 <= self::$srcContext) {
                     if (!empty($f['class']) && (is_subclass_of($f['class'], 'Twig\Template') || is_subclass_of($f['class'], 'Twig_Template')) && method_exists($f['class'], 'getDebugInfo')) {
-                        $template = isset($f['object']) ? $f['object'] : unserialize(sprintf('O:%d:"%s":0:{}', strlen($f['class']), $f['class']));
+                        $template = isset($f['object']) ? $f['object'] : unserialize(sprintf('O:%d:"%s":0:{}', \strlen($f['class']), $f['class']));
 
                         $ellipsis = 0;
                         $templateSrc = method_exists($template, 'getSourceContext') ? $template->getSourceContext()->getCode() : (method_exists($template, 'getSource') ? $template->getSource() : '');
@@ -231,7 +231,7 @@ public static function castFrameStub(FrameStub $frame, array $a, Stub $stub, $is
                         $src = self::extractSource(file_get_contents($f['file']), $f['line'], self::$srcContext, $caller, 'php', $f['file']);
                         $srcKey .= ':'.$f['line'];
                         if ($ellipsis) {
-                            $ellipsis += 1 + strlen($f['line']);
+                            $ellipsis += 1 + \strlen($f['line']);
                         }
                     }
                     $srcAttr .= '&separator= ';
diff --git a/src/Symfony/Component/VarDumper/Caster/LinkStub.php b/src/Symfony/Component/VarDumper/Caster/LinkStub.php
index d709e262de2f..5511404af724 100644
--- a/src/Symfony/Component/VarDumper/Caster/LinkStub.php
+++ b/src/Symfony/Component/VarDumper/Caster/LinkStub.php
@@ -30,7 +30,7 @@ public function __construct($label, int $line = 0, $href = null)
         if (null === $href) {
             $href = $label;
         }
-        if (!is_string($href)) {
+        if (!\is_string($href)) {
             return;
         }
         if (0 === strpos($href, 'file://')) {
@@ -53,11 +53,11 @@ public function __construct($label, int $line = 0, $href = null)
             return;
         }
         if ($composerRoot = $this->getComposerRoot($href, $this->inVendor)) {
-            $this->attr['ellipsis'] = strlen($href) - strlen($composerRoot) + 1;
+            $this->attr['ellipsis'] = \strlen($href) - \strlen($composerRoot) + 1;
             $this->attr['ellipsis-type'] = 'path';
-            $this->attr['ellipsis-tail'] = 1 + ($this->inVendor ? 2 + strlen(implode(array_slice(explode(DIRECTORY_SEPARATOR, substr($href, 1 - $this->attr['ellipsis'])), 0, 2))) : 0);
-        } elseif (3 < count($ellipsis = explode(DIRECTORY_SEPARATOR, $href))) {
-            $this->attr['ellipsis'] = 2 + strlen(implode(array_slice($ellipsis, -2)));
+            $this->attr['ellipsis-tail'] = 1 + ($this->inVendor ? 2 + \strlen(implode(\array_slice(explode(\DIRECTORY_SEPARATOR, substr($href, 1 - $this->attr['ellipsis'])), 0, 2))) : 0);
+        } elseif (3 < \count($ellipsis = explode(\DIRECTORY_SEPARATOR, $href))) {
+            $this->attr['ellipsis'] = 2 + \strlen(implode(\array_slice($ellipsis, -2)));
             $this->attr['ellipsis-type'] = 'path';
             $this->attr['ellipsis-tail'] = 1;
         }
@@ -71,16 +71,16 @@ private function getComposerRoot($file, &$inVendor)
             foreach (get_declared_classes() as $class) {
                 if ('C' === $class[0] && 0 === strpos($class, 'ComposerAutoloaderInit')) {
                     $r = new \ReflectionClass($class);
-                    $v = dirname(dirname($r->getFileName()));
+                    $v = \dirname(\dirname($r->getFileName()));
                     if (file_exists($v.'/composer/installed.json')) {
-                        self::$vendorRoots[] = $v.DIRECTORY_SEPARATOR;
+                        self::$vendorRoots[] = $v.\DIRECTORY_SEPARATOR;
                     }
                 }
             }
         }
         $inVendor = false;
 
-        if (isset(self::$composerRoots[$dir = dirname($file)])) {
+        if (isset(self::$composerRoots[$dir = \dirname($file)])) {
             return self::$composerRoots[$dir];
         }
 
@@ -96,13 +96,13 @@ private function getComposerRoot($file, &$inVendor)
                 // open_basedir restriction in effect
                 break;
             }
-            if ($parent === dirname($parent)) {
+            if ($parent === \dirname($parent)) {
                 return self::$composerRoots[$dir] = false;
             }
 
-            $parent = dirname($parent);
+            $parent = \dirname($parent);
         }
 
-        return self::$composerRoots[$dir] = $parent.DIRECTORY_SEPARATOR;
+        return self::$composerRoots[$dir] = $parent.\DIRECTORY_SEPARATOR;
     }
 }
diff --git a/src/Symfony/Component/VarDumper/Caster/PdoCaster.php b/src/Symfony/Component/VarDumper/Caster/PdoCaster.php
index b86678247736..83a001d96080 100644
--- a/src/Symfony/Component/VarDumper/Caster/PdoCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/PdoCaster.php
@@ -70,7 +70,7 @@ public static function castPdo(\PDO $c, array $a, Stub $stub, $isNested)
             }
 
             try {
-                $attr[$k] = 'ERRMODE' === $k ? $errmode : $c->getAttribute(constant('PDO::ATTR_'.$k));
+                $attr[$k] = 'ERRMODE' === $k ? $errmode : $c->getAttribute(\constant('PDO::ATTR_'.$k));
                 if ($v && isset($v[$attr[$k]])) {
                     $attr[$k] = new ConstStub($v[$attr[$k]], $attr[$k]);
                 }
diff --git a/src/Symfony/Component/VarDumper/Caster/RedisCaster.php b/src/Symfony/Component/VarDumper/Caster/RedisCaster.php
index 3d7063f40a27..112097fd955b 100644
--- a/src/Symfony/Component/VarDumper/Caster/RedisCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/RedisCaster.php
@@ -37,7 +37,7 @@ public static function castRedis(\Redis $c, array $a, Stub $stub, $isNested)
         }
 
         $ser = $c->getOption(\Redis::OPT_SERIALIZER);
-        $retry = defined('Redis::OPT_SCAN') ? $c->getOption(\Redis::OPT_SCAN) : 0;
+        $retry = \defined('Redis::OPT_SCAN') ? $c->getOption(\Redis::OPT_SCAN) : 0;
 
         return $a + array(
             $prefix.'isConnected' => $connected,
diff --git a/src/Symfony/Component/VarDumper/Caster/ReflectionCaster.php b/src/Symfony/Component/VarDumper/Caster/ReflectionCaster.php
index b7aee3212494..c625e787d37f 100644
--- a/src/Symfony/Component/VarDumper/Caster/ReflectionCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/ReflectionCaster.php
@@ -198,7 +198,7 @@ public static function castFunctionAbstract(\ReflectionFunctionAbstract $c, arra
 
         if ($v = $c->getStaticVariables()) {
             foreach ($v as $k => &$v) {
-                if (is_object($v)) {
+                if (\is_object($v)) {
                     $a[$prefix.'use']['$'.$k] = new CutStub($v);
                 } else {
                     $a[$prefix.'use']['$'.$k] = &$v;
diff --git a/src/Symfony/Component/VarDumper/Caster/StubCaster.php b/src/Symfony/Component/VarDumper/Caster/StubCaster.php
index 2ec096c5a8c8..b0bf5dc80d64 100644
--- a/src/Symfony/Component/VarDumper/Caster/StubCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/StubCaster.php
@@ -30,7 +30,7 @@ public static function castStub(Stub $c, array $a, Stub $stub, $isNested)
             $stub->cut = $c->cut;
             $stub->attr = $c->attr;
 
-            if (Stub::TYPE_REF === $c->type && !$c->class && is_string($c->value) && !preg_match('//u', $c->value)) {
+            if (Stub::TYPE_REF === $c->type && !$c->class && \is_string($c->value) && !preg_match('//u', $c->value)) {
                 $stub->type = Stub::TYPE_STRING;
                 $stub->class = Stub::STRING_BINARY;
             }
@@ -49,7 +49,7 @@ public static function castCutArray(CutArrayStub $c, array $a, Stub $stub, $isNe
     public static function cutInternals($obj, array $a, Stub $stub, $isNested)
     {
         if ($isNested) {
-            $stub->cut += count($a);
+            $stub->cut += \count($a);
 
             return array();
         }
diff --git a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
index b11ca6b2571c..7d42358c37ea 100644
--- a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
+++ b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
@@ -164,7 +164,7 @@ public function __construct(array $casters = null)
     public function addCasters(array $casters)
     {
         foreach ($casters as $type => $callback) {
-            $this->casters[strtolower($type)][] = is_string($callback) && false !== strpos($callback, '::') ? explode('::', $callback, 2) : $callback;
+            $this->casters[strtolower($type)][] = \is_string($callback) && false !== strpos($callback, '::') ? explode('::', $callback, 2) : $callback;
         }
     }
 
@@ -216,7 +216,7 @@ public function cloneVar($var, $filter = 0)
             }
 
             if ($this->prevErrorHandler) {
-                return call_user_func($this->prevErrorHandler, $type, $msg, $file, $line, $context);
+                return \call_user_func($this->prevErrorHandler, $type, $msg, $file, $line, $context);
             }
 
             return false;
diff --git a/src/Symfony/Component/VarDumper/Cloner/Data.php b/src/Symfony/Component/VarDumper/Cloner/Data.php
index f32532123403..cf5f204cd7ac 100644
--- a/src/Symfony/Component/VarDumper/Cloner/Data.php
+++ b/src/Symfony/Component/VarDumper/Cloner/Data.php
@@ -44,7 +44,7 @@ public function getType()
             $item = $item->value;
         }
         if (!$item instanceof Stub) {
-            return gettype($item);
+            return \gettype($item);
         }
         if (Stub::TYPE_STRING === $item->type) {
             return 'string';
@@ -106,13 +106,13 @@ public function getValue($recursive = false)
 
     public function count()
     {
-        return count($this->getValue());
+        return \count($this->getValue());
     }
 
     public function getIterator()
     {
-        if (!is_array($value = $this->getValue())) {
-            throw new \LogicException(sprintf('%s object holds non-iterable type "%s".', self::class, gettype($value)));
+        if (!\is_array($value = $this->getValue())) {
+            throw new \LogicException(sprintf('%s object holds non-iterable type "%s".', self::class, \gettype($value)));
         }
 
         foreach ($value as $k => $v) {
@@ -158,11 +158,11 @@ public function __toString()
     {
         $value = $this->getValue();
 
-        if (!is_array($value)) {
+        if (!\is_array($value)) {
             return (string) $value;
         }
 
-        return sprintf('%s (count=%d)', $this->getType(), count($value));
+        return sprintf('%s (count=%d)', $this->getType(), \count($value));
     }
 
     /**
@@ -300,7 +300,7 @@ private function dumpItem($dumper, $cursor, &$refs, $item)
                 $cursor->hardRefCount = $item->refCount;
             }
             $cursor->attr = $item->attr;
-            $type = $item->class ?: gettype($item->value);
+            $type = $item->class ?: \gettype($item->value);
             $item = $this->getStub($item->value);
         }
         if ($item instanceof Stub) {
@@ -322,7 +322,7 @@ private function dumpItem($dumper, $cursor, &$refs, $item)
 
                 if ($cursor->stop) {
                     if ($cut >= 0) {
-                        $cut += count($children);
+                        $cut += \count($children);
                     }
                     $children = array();
                 }
@@ -351,7 +351,7 @@ private function dumpItem($dumper, $cursor, &$refs, $item)
                             $cut = $this->dumpChildren($dumper, $cursor, $refs, $children, $cut, $item->type, null !== $item->class);
                         }
                     } elseif ($children && 0 <= $cut) {
-                        $cut += count($children);
+                        $cut += \count($children);
                     }
                     $cursor->skipChildren = false;
                     $dumper->leaveHash($cursor, $item->type, $item->class, $withChildren, $cut);
@@ -389,7 +389,7 @@ private function dumpChildren($dumper, $parentCursor, &$refs, $children, $hashCu
         ++$cursor->depth;
         $cursor->hashType = $hashType;
         $cursor->hashIndex = 0;
-        $cursor->hashLength = count($children);
+        $cursor->hashLength = \count($children);
         $cursor->hashCut = $hashCut;
         foreach ($children as $key => $child) {
             $cursor->hashKeyIsBinary = isset($key[0]) && !preg_match('//u', $key);
diff --git a/src/Symfony/Component/VarDumper/Dumper/AbstractDumper.php b/src/Symfony/Component/VarDumper/Dumper/AbstractDumper.php
index 73b5f643a724..abcda1af8002 100644
--- a/src/Symfony/Component/VarDumper/Dumper/AbstractDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/AbstractDumper.php
@@ -49,7 +49,7 @@ public function __construct($output = null, string $charset = null, int $flags =
         $this->decimalPoint = localeconv();
         $this->decimalPoint = $this->decimalPoint['decimal_point'];
         $this->setOutput($output ?: static::$defaultOutput);
-        if (!$output && is_string(static::$defaultOutput)) {
+        if (!$output && \is_string(static::$defaultOutput)) {
             static::$defaultOutput = $this->outputStream;
         }
     }
@@ -65,11 +65,11 @@ public function setOutput($output)
     {
         $prev = null !== $this->outputStream ? $this->outputStream : $this->lineDumper;
 
-        if (is_callable($output)) {
+        if (\is_callable($output)) {
             $this->outputStream = null;
             $this->lineDumper = $output;
         } else {
-            if (is_string($output)) {
+            if (\is_string($output)) {
                 $output = fopen($output, 'wb');
             }
             $this->outputStream = $output;
@@ -164,7 +164,7 @@ public function dump(Data $data, $output = null)
      */
     protected function dumpLine($depth)
     {
-        call_user_func($this->lineDumper, $this->line, $depth, $this->indentPad);
+        \call_user_func($this->lineDumper, $this->line, $depth, $this->indentPad);
         $this->line = '';
     }
 
@@ -195,7 +195,7 @@ protected function utf8Encode($s)
             return $s;
         }
 
-        if (!function_exists('iconv')) {
+        if (!\function_exists('iconv')) {
             throw new \RuntimeException('Unable to convert a non-UTF-8 string to UTF-8: required function iconv() does not exist. You should install ext-iconv or symfony/polyfill-iconv.');
         }
 
diff --git a/src/Symfony/Component/VarDumper/Dumper/CliDumper.php b/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
index f97715723181..9fcd6c412666 100644
--- a/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
@@ -62,7 +62,7 @@ public function __construct($output = null, string $charset = null, int $flags =
     {
         parent::__construct($output, $charset, $flags);
 
-        if ('\\' === DIRECTORY_SEPARATOR && !$this->isWindowsTrueColor()) {
+        if ('\\' === \DIRECTORY_SEPARATOR && !$this->isWindowsTrueColor()) {
             // Use only the base 16 xterm colors when using ANSICON or standard Windows 10 CLI
             $this->setStyles(array(
                 'default' => '31',
@@ -186,7 +186,7 @@ public function dumpString(Cursor $cursor, $str, $bin, $cut)
                 unset($str[1]);
                 $str[0] .= "\n";
             }
-            $m = count($str) - 1;
+            $m = \count($str) - 1;
             $i = $lineCut = 0;
 
             if (self::DUMP_STRING_LENGTH & $this->flags) {
@@ -339,7 +339,7 @@ protected function dumpKey(Cursor $cursor)
                     $style = 'index';
                     // no break
                 case Cursor::HASH_ASSOC:
-                    if (is_int($key)) {
+                    if (\is_int($key)) {
                         $this->line .= $this->style($style, $key).' => ';
                     } else {
                         $this->line .= $bin.'"'.$this->style($style, $key).'" => ';
@@ -417,8 +417,8 @@ protected function style($style, $value, $attr = array())
 
         if (isset($attr['ellipsis'], $attr['ellipsis-type'])) {
             $prefix = substr($value, 0, -$attr['ellipsis']);
-            if ('cli' === PHP_SAPI && 'path' === $attr['ellipsis-type'] && isset($_SERVER[$pwd = '\\' === DIRECTORY_SEPARATOR ? 'CD' : 'PWD']) && 0 === strpos($prefix, $_SERVER[$pwd])) {
-                $prefix = '.'.substr($prefix, strlen($_SERVER[$pwd]));
+            if ('cli' === \PHP_SAPI && 'path' === $attr['ellipsis-type'] && isset($_SERVER[$pwd = '\\' === \DIRECTORY_SEPARATOR ? 'CD' : 'PWD']) && 0 === strpos($prefix, $_SERVER[$pwd])) {
+                $prefix = '.'.substr($prefix, \strlen($_SERVER[$pwd]));
             }
             if (!empty($attr['ellipsis-tail'])) {
                 $prefix .= substr($value, -$attr['ellipsis'], $attr['ellipsis-tail']);
@@ -439,7 +439,7 @@ protected function style($style, $value, $attr = array())
             $s = $startCchr;
             $c = $c[$i = 0];
             do {
-                $s .= isset($map[$c[$i]]) ? $map[$c[$i]] : sprintf('\x%02X', ord($c[$i]));
+                $s .= isset($map[$c[$i]]) ? $map[$c[$i]] : sprintf('\x%02X', \ord($c[$i]));
             } while (isset($c[++$i]));
 
             return $s.$endCchr;
@@ -447,12 +447,12 @@ protected function style($style, $value, $attr = array())
 
         if ($this->colors) {
             if ($cchrCount && "\033" === $value[0]) {
-                $value = substr($value, strlen($startCchr));
+                $value = substr($value, \strlen($startCchr));
             } else {
                 $value = "\033[{$style}m".$value;
             }
-            if ($cchrCount && $endCchr === substr($value, -strlen($endCchr))) {
-                $value = substr($value, 0, -strlen($endCchr));
+            if ($cchrCount && $endCchr === substr($value, -\strlen($endCchr))) {
+                $value = substr($value, 0, -\strlen($endCchr));
             } else {
                 $value .= "\033[{$this->styles['default']}m";
             }
@@ -474,7 +474,7 @@ protected function supportsColors()
         }
         if (isset($_SERVER['argv'][1])) {
             $colors = $_SERVER['argv'];
-            $i = count($colors);
+            $i = \count($colors);
             while (--$i > 0) {
                 if (isset($colors[$i][5])) {
                     switch ($colors[$i]) {
@@ -537,7 +537,7 @@ protected function endValue(Cursor $cursor)
      */
     private function hasColorSupport($stream)
     {
-        if (!is_resource($stream) || 'stream' !== get_resource_type($stream)) {
+        if (!\is_resource($stream) || 'stream' !== get_resource_type($stream)) {
             return false;
         }
 
@@ -545,19 +545,19 @@ private function hasColorSupport($stream)
             return true;
         }
 
-        if (DIRECTORY_SEPARATOR === '\\') {
-            return (function_exists('sapi_windows_vt100_support')
+        if (\DIRECTORY_SEPARATOR === '\\') {
+            return (\function_exists('sapi_windows_vt100_support')
                 && @sapi_windows_vt100_support($stream))
                 || false !== getenv('ANSICON')
                 || 'ON' === getenv('ConEmuANSI')
                 || 'xterm' === getenv('TERM');
         }
 
-        if (function_exists('stream_isatty')) {
+        if (\function_exists('stream_isatty')) {
             return @stream_isatty($stream);
         }
 
-        if (function_exists('posix_isatty')) {
+        if (\function_exists('posix_isatty')) {
             return @posix_isatty($stream);
         }
 
@@ -582,7 +582,7 @@ private function isWindowsTrueColor()
             || 'xterm' === getenv('TERM')
             || 'Hyper' === getenv('TERM_PROGRAM');
 
-        if (!$result && PHP_VERSION_ID >= 70200) {
+        if (!$result && \PHP_VERSION_ID >= 70200) {
             $version = sprintf(
                 '%s.%s.%s',
                 PHP_WINDOWS_VERSION_MAJOR,
diff --git a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
index 28cf6699306c..0edb97cdc7ba 100644
--- a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
@@ -826,10 +826,10 @@ protected function style($style, $value, $attr = array())
             }
             $label = esc(substr($value, -$attr['ellipsis']));
             $style = str_replace(' title="', " title=\"$v\n", $style);
-            $v = sprintf('<span class=%s>%s</span>', $class, substr($v, 0, -strlen($label)));
+            $v = sprintf('<span class=%s>%s</span>', $class, substr($v, 0, -\strlen($label)));
 
             if (!empty($attr['ellipsis-tail'])) {
-                $tail = strlen(esc(substr($value, -$attr['ellipsis'], $attr['ellipsis-tail'])));
+                $tail = \strlen(esc(substr($value, -$attr['ellipsis'], $attr['ellipsis-tail'])));
                 $v .= sprintf('<span class=sf-dump-ellipsis>%s</span>%s', substr($label, 0, $tail), substr($label, $tail));
             } else {
                 $v .= $label;
@@ -840,7 +840,7 @@ protected function style($style, $value, $attr = array())
             $s = '<span class=sf-dump-default>';
             $c = $c[$i = 0];
             do {
-                $s .= isset($map[$c[$i]]) ? $map[$c[$i]] : sprintf('\x%02X', ord($c[$i]));
+                $s .= isset($map[$c[$i]]) ? $map[$c[$i]] : sprintf('\x%02X', \ord($c[$i]));
             } while (isset($c[++$i]));
 
             return $s.'</span>';
@@ -895,7 +895,7 @@ private function getSourceLink($file, $line)
         $options = $this->extraDisplayOptions + $this->displayOptions;
 
         if ($fmt = $options['fileLinkFormat']) {
-            return is_string($fmt) ? strtr($fmt, array('%f' => $file, '%l' => $line)) : $fmt->format($file, $line);
+            return \is_string($fmt) ? strtr($fmt, array('%f' => $file, '%l' => $line)) : $fmt->format($file, $line);
         }
 
         return false;
diff --git a/src/Symfony/Component/VarDumper/Exception/ThrowingCasterException.php b/src/Symfony/Component/VarDumper/Exception/ThrowingCasterException.php
index 976f4439b67f..af47753ad5b6 100644
--- a/src/Symfony/Component/VarDumper/Exception/ThrowingCasterException.php
+++ b/src/Symfony/Component/VarDumper/Exception/ThrowingCasterException.php
@@ -21,6 +21,6 @@ class ThrowingCasterException extends \Exception
      */
     public function __construct(\Exception $prev)
     {
-        parent::__construct('Unexpected '.get_class($prev).' thrown from a caster: '.$prev->getMessage(), 0, $prev);
+        parent::__construct('Unexpected '.\get_class($prev).' thrown from a caster: '.$prev->getMessage(), 0, $prev);
     }
 }
diff --git a/src/Symfony/Component/VarDumper/Tests/Caster/DateCasterTest.php b/src/Symfony/Component/VarDumper/Tests/Caster/DateCasterTest.php
index f6d03792b12a..d27968667d56 100644
--- a/src/Symfony/Component/VarDumper/Tests/Caster/DateCasterTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Caster/DateCasterTest.php
@@ -94,7 +94,7 @@ public function provideDateTimes()
      */
     public function testDumpInterval($intervalSpec, $ms, $invert, $expected)
     {
-        if ($ms && PHP_VERSION_ID >= 70200 && version_compare(PHP_VERSION, '7.2.0rc3', '<=')) {
+        if ($ms && \PHP_VERSION_ID >= 70200 && version_compare(PHP_VERSION, '7.2.0rc3', '<=')) {
             $this->markTestSkipped('Skipped on 7.2 before rc4 because of php bug #75354.');
         }
 
@@ -114,7 +114,7 @@ public function testDumpInterval($intervalSpec, $ms, $invert, $expected)
      */
     public function testDumpIntervalExcludingVerbosity($intervalSpec, $ms, $invert, $expected)
     {
-        if ($ms && PHP_VERSION_ID >= 70200 && version_compare(PHP_VERSION, '7.2.0rc3', '<=')) {
+        if ($ms && \PHP_VERSION_ID >= 70200 && version_compare(PHP_VERSION, '7.2.0rc3', '<=')) {
             $this->markTestSkipped('Skipped on 7.2 before rc4 because of php bug #75354.');
         }
 
@@ -134,7 +134,7 @@ public function testDumpIntervalExcludingVerbosity($intervalSpec, $ms, $invert,
      */
     public function testCastInterval($intervalSpec, $ms, $invert, $xInterval, $xSeconds)
     {
-        if ($ms && PHP_VERSION_ID >= 70200 && version_compare(PHP_VERSION, '7.2.0rc3', '<=')) {
+        if ($ms && \PHP_VERSION_ID >= 70200 && version_compare(PHP_VERSION, '7.2.0rc3', '<=')) {
             $this->markTestSkipped('Skipped on 7.2 before rc4 because of php bug #75354.');
         }
 
@@ -272,7 +272,7 @@ public function testCastTimeZone($timezone, $xTimezone, $xRegion)
 
     public function provideTimeZones()
     {
-        $xRegion = extension_loaded('intl') ? '%s' : '';
+        $xRegion = \extension_loaded('intl') ? '%s' : '';
 
         return array(
             // type 1 (UTC offset)
@@ -302,7 +302,7 @@ public function provideTimeZones()
      */
     public function testDumpPeriod($start, $interval, $end, $options, $expected)
     {
-        $p = new \DatePeriod(new \DateTime($start), new \DateInterval($interval), is_int($end) ? $end : new \DateTime($end), $options);
+        $p = new \DatePeriod(new \DateTime($start), new \DateInterval($interval), \is_int($end) ? $end : new \DateTime($end), $options);
 
         $xDump = <<<EODUMP
 DatePeriod {
@@ -318,7 +318,7 @@ public function testDumpPeriod($start, $interval, $end, $options, $expected)
      */
     public function testCastPeriod($start, $interval, $end, $options, $xPeriod, $xDates)
     {
-        $p = new \DatePeriod(new \DateTime($start), new \DateInterval($interval), is_int($end) ? $end : new \DateTime($end), $options);
+        $p = new \DatePeriod(new \DateTime($start), new \DateInterval($interval), \is_int($end) ? $end : new \DateTime($end), $options);
         $stub = new Stub();
 
         $cast = DateCaster::castPeriod($p, array(), $stub, false, 0);
diff --git a/src/Symfony/Component/VarDumper/Tests/Caster/ExceptionCasterTest.php b/src/Symfony/Component/VarDumper/Tests/Caster/ExceptionCasterTest.php
index c9cc24f2dff6..4f9b538a0a0e 100644
--- a/src/Symfony/Component/VarDumper/Tests/Caster/ExceptionCasterTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Caster/ExceptionCasterTest.php
@@ -164,16 +164,16 @@ public function testHtmlDump()
      */
     public function testFrameWithTwig()
     {
-        require_once dirname(__DIR__).'/Fixtures/Twig.php';
+        require_once \dirname(__DIR__).'/Fixtures/Twig.php';
 
         $f = array(
             new FrameStub(array(
-                'file' => dirname(__DIR__).'/Fixtures/Twig.php',
+                'file' => \dirname(__DIR__).'/Fixtures/Twig.php',
                 'line' => 20,
                 'class' => '__TwigTemplate_VarDumperFixture_u75a09',
             )),
             new FrameStub(array(
-                'file' => dirname(__DIR__).'/Fixtures/Twig.php',
+                'file' => \dirname(__DIR__).'/Fixtures/Twig.php',
                 'line' => 21,
                 'class' => '__TwigTemplate_VarDumperFixture_u75a09',
                 'object' => new \__TwigTemplate_VarDumperFixture_u75a09(null, __FILE__),
diff --git a/src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php b/src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php
index 3eaf958d8f68..828fc30bf09a 100644
--- a/src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php
@@ -154,7 +154,7 @@ class: "Symfony\Component\VarDumper\Tests\Caster\ReflectionCasterTest"
 
     public function testGenerator()
     {
-        if (extension_loaded('xdebug')) {
+        if (\extension_loaded('xdebug')) {
             $this->markTestSkipped('xdebug is active');
         }
 
diff --git a/src/Symfony/Component/VarDumper/Tests/Cloner/DataTest.php b/src/Symfony/Component/VarDumper/Tests/Cloner/DataTest.php
index 83f6b6007425..d10951be93de 100644
--- a/src/Symfony/Component/VarDumper/Tests/Cloner/DataTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Cloner/DataTest.php
@@ -26,14 +26,14 @@ public function testBasicData()
         $clonedValues = array();
 
         $this->assertInstanceOf(Data::class, $data);
-        $this->assertCount(count($values), $data);
+        $this->assertCount(\count($values), $data);
         $this->assertFalse(isset($data->{0}));
         $this->assertFalse(isset($data[0]));
 
         foreach ($data as $k => $v) {
             $this->assertTrue(isset($data->{$k}));
             $this->assertTrue(isset($data[$k]));
-            $this->assertSame(gettype($values[$k]), $data->seek($k)->getType());
+            $this->assertSame(\gettype($values[$k]), $data->seek($k)->getType());
             $this->assertSame($values[$k], $data->seek($k)->getValue());
             $this->assertSame($values[$k], $data->{$k});
             $this->assertSame($values[$k], $data[$k]);
diff --git a/src/Symfony/Component/VarDumper/VarDumper.php b/src/Symfony/Component/VarDumper/VarDumper.php
index 137c47478029..a9ed05b3b38b 100644
--- a/src/Symfony/Component/VarDumper/VarDumper.php
+++ b/src/Symfony/Component/VarDumper/VarDumper.php
@@ -29,13 +29,13 @@ public static function dump($var)
     {
         if (null === self::$handler) {
             $cloner = new VarCloner();
-            $dumper = \in_array(PHP_SAPI, array('cli', 'phpdbg'), true) ? new CliDumper() : new HtmlDumper();
+            $dumper = \in_array(\PHP_SAPI, array('cli', 'phpdbg'), true) ? new CliDumper() : new HtmlDumper();
             self::$handler = function ($var) use ($cloner, $dumper) {
                 $dumper->dump($cloner->cloneVar($var));
             };
         }
 
-        return call_user_func(self::$handler, $var);
+        return \call_user_func(self::$handler, $var);
     }
 
     public static function setHandler(callable $callable = null)
diff --git a/src/Symfony/Component/WebLink/HttpHeaderSerializer.php b/src/Symfony/Component/WebLink/HttpHeaderSerializer.php
index 01bb9f154b82..bcc04acf234d 100644
--- a/src/Symfony/Component/WebLink/HttpHeaderSerializer.php
+++ b/src/Symfony/Component/WebLink/HttpHeaderSerializer.php
@@ -39,7 +39,7 @@ public function serialize(iterable $links)
 
             $attributesParts = array('', sprintf('rel="%s"', implode(' ', $link->getRels())));
             foreach ($link->getAttributes() as $key => $value) {
-                if (is_array($value)) {
+                if (\is_array($value)) {
                     foreach ($value as $v) {
                         $attributesParts[] = sprintf('%s="%s"', $key, $v);
                     }
@@ -47,7 +47,7 @@ public function serialize(iterable $links)
                     continue;
                 }
 
-                if (!is_bool($value)) {
+                if (!\is_bool($value)) {
                     $attributesParts[] = sprintf('%s="%s"', $key, $value);
 
                     continue;
diff --git a/src/Symfony/Component/WebLink/Tests/EventListener/AddLinkHeaderListenerTest.php b/src/Symfony/Component/WebLink/Tests/EventListener/AddLinkHeaderListenerTest.php
index 8a0aabc69ced..c592eb231c94 100644
--- a/src/Symfony/Component/WebLink/Tests/EventListener/AddLinkHeaderListenerTest.php
+++ b/src/Symfony/Component/WebLink/Tests/EventListener/AddLinkHeaderListenerTest.php
@@ -14,12 +14,12 @@
 use Fig\Link\GenericLinkProvider;
 use Fig\Link\Link;
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\WebLink\EventListener\AddLinkHeaderListener;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\WebLink\EventListener\AddLinkHeaderListener;
 
 /**
  * @author Kévin Dunglas <dunglas@gmail.com>
diff --git a/src/Symfony/Component/Workflow/Definition.php b/src/Symfony/Component/Workflow/Definition.php
index 1469881de59c..c6135b197e00 100644
--- a/src/Symfony/Component/Workflow/Definition.php
+++ b/src/Symfony/Component/Workflow/Definition.php
@@ -86,7 +86,7 @@ private function addPlace(string $place)
             throw new InvalidArgumentException(sprintf('The place "%s" contains invalid characters.', $place));
         }
 
-        if (!count($this->places)) {
+        if (!\count($this->places)) {
             $this->initialPlace = $place;
         }
 
diff --git a/src/Symfony/Component/Workflow/EventListener/AuditTrailListener.php b/src/Symfony/Component/Workflow/EventListener/AuditTrailListener.php
index 83b1c5e1d8f9..ba56b586016e 100644
--- a/src/Symfony/Component/Workflow/EventListener/AuditTrailListener.php
+++ b/src/Symfony/Component/Workflow/EventListener/AuditTrailListener.php
@@ -30,19 +30,19 @@ public function __construct(LoggerInterface $logger)
     public function onLeave(Event $event)
     {
         foreach ($event->getTransition()->getFroms() as $place) {
-            $this->logger->info(sprintf('Leaving "%s" for subject of class "%s" in workflow "%s".', $place, get_class($event->getSubject()), $event->getWorkflowName()));
+            $this->logger->info(sprintf('Leaving "%s" for subject of class "%s" in workflow "%s".', $place, \get_class($event->getSubject()), $event->getWorkflowName()));
         }
     }
 
     public function onTransition(Event $event)
     {
-        $this->logger->info(sprintf('Transition "%s" for subject of class "%s" in workflow "%s".', $event->getTransition()->getName(), get_class($event->getSubject()), $event->getWorkflowName()));
+        $this->logger->info(sprintf('Transition "%s" for subject of class "%s" in workflow "%s".', $event->getTransition()->getName(), \get_class($event->getSubject()), $event->getWorkflowName()));
     }
 
     public function onEnter(Event $event)
     {
         foreach ($event->getTransition()->getTos() as $place) {
-            $this->logger->info(sprintf('Entering "%s" for subject of class "%s" in workflow "%s".', $place, get_class($event->getSubject()), $event->getWorkflowName()));
+            $this->logger->info(sprintf('Entering "%s" for subject of class "%s" in workflow "%s".', $place, \get_class($event->getSubject()), $event->getWorkflowName()));
         }
     }
 
diff --git a/src/Symfony/Component/Workflow/EventListener/ExpressionLanguage.php b/src/Symfony/Component/Workflow/EventListener/ExpressionLanguage.php
index e1bcc7997d31..6fb43077bb7a 100644
--- a/src/Symfony/Component/Workflow/EventListener/ExpressionLanguage.php
+++ b/src/Symfony/Component/Workflow/EventListener/ExpressionLanguage.php
@@ -41,7 +41,7 @@ protected function registerFunctions()
 
             $errors = $variables['validator']->validate($object, null, $groups);
 
-            return 0 === count($errors);
+            return 0 === \count($errors);
         });
     }
 }
diff --git a/src/Symfony/Component/Workflow/Registry.php b/src/Symfony/Component/Workflow/Registry.php
index 2430dcb34cea..ac7200894d8c 100644
--- a/src/Symfony/Component/Workflow/Registry.php
+++ b/src/Symfony/Component/Workflow/Registry.php
@@ -55,7 +55,7 @@ public function get($subject, $workflowName = null)
         }
 
         if (!$matched) {
-            throw new InvalidArgumentException(sprintf('Unable to find a workflow for class "%s".', get_class($subject)));
+            throw new InvalidArgumentException(sprintf('Unable to find a workflow for class "%s".', \get_class($subject)));
         }
 
         return $matched;
diff --git a/src/Symfony/Component/Workflow/Tests/EventListener/GuardListenerTest.php b/src/Symfony/Component/Workflow/Tests/EventListener/GuardListenerTest.php
index f532639ae09c..e224835a0764 100644
--- a/src/Symfony/Component/Workflow/Tests/EventListener/GuardListenerTest.php
+++ b/src/Symfony/Component/Workflow/Tests/EventListener/GuardListenerTest.php
@@ -9,9 +9,9 @@
 use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
 use Symfony\Component\Security\Core\Role\Role;
 use Symfony\Component\Validator\Validator\ValidatorInterface;
+use Symfony\Component\Workflow\Event\GuardEvent;
 use Symfony\Component\Workflow\EventListener\ExpressionLanguage;
 use Symfony\Component\Workflow\EventListener\GuardListener;
-use Symfony\Component\Workflow\Event\GuardEvent;
 use Symfony\Component\Workflow\Marking;
 use Symfony\Component\Workflow\Transition;
 
diff --git a/src/Symfony/Component/Workflow/Validator/StateMachineValidator.php b/src/Symfony/Component/Workflow/Validator/StateMachineValidator.php
index 8fe5eecc4a22..4f32ae51205a 100644
--- a/src/Symfony/Component/Workflow/Validator/StateMachineValidator.php
+++ b/src/Symfony/Component/Workflow/Validator/StateMachineValidator.php
@@ -24,14 +24,14 @@ public function validate(Definition $definition, $name)
         $transitionFromNames = array();
         foreach ($definition->getTransitions() as $transition) {
             // Make sure that each transition has exactly one TO
-            if (1 !== count($transition->getTos())) {
-                throw new InvalidDefinitionException(sprintf('A transition in StateMachine can only have one output. But the transition "%s" in StateMachine "%s" has %d outputs.', $transition->getName(), $name, count($transition->getTos())));
+            if (1 !== \count($transition->getTos())) {
+                throw new InvalidDefinitionException(sprintf('A transition in StateMachine can only have one output. But the transition "%s" in StateMachine "%s" has %d outputs.', $transition->getName(), $name, \count($transition->getTos())));
             }
 
             // Make sure that each transition has exactly one FROM
             $froms = $transition->getFroms();
-            if (1 !== count($froms)) {
-                throw new InvalidDefinitionException(sprintf('A transition in StateMachine can only have one input. But the transition "%s" in StateMachine "%s" has %d inputs.', $transition->getName(), $name, count($froms)));
+            if (1 !== \count($froms)) {
+                throw new InvalidDefinitionException(sprintf('A transition in StateMachine can only have one input. But the transition "%s" in StateMachine "%s" has %d inputs.', $transition->getName(), $name, \count($froms)));
             }
 
             // Enforcing uniqueness of the names of transitions starting at each node
diff --git a/src/Symfony/Component/Workflow/Validator/WorkflowValidator.php b/src/Symfony/Component/Workflow/Validator/WorkflowValidator.php
index e105224d221d..703be54cb292 100644
--- a/src/Symfony/Component/Workflow/Validator/WorkflowValidator.php
+++ b/src/Symfony/Component/Workflow/Validator/WorkflowValidator.php
@@ -32,7 +32,7 @@ public function validate(Definition $definition, $name)
         $places = array_fill_keys($definition->getPlaces(), array());
         foreach ($definition->getTransitions() as $transition) {
             foreach ($transition->getFroms() as $from) {
-                if (in_array($transition->getName(), $places[$from])) {
+                if (\in_array($transition->getName(), $places[$from])) {
                     throw new InvalidDefinitionException(sprintf('All transitions for a place must have an unique name. Multiple transitions named "%s" where found for place "%s" in workflow "%s".', $transition->getName(), $from, $name));
                 }
                 $places[$from][] = $transition->getName();
@@ -44,8 +44,8 @@ public function validate(Definition $definition, $name)
         }
 
         foreach ($definition->getTransitions() as $transition) {
-            if (1 < count($transition->getTos())) {
-                throw new InvalidDefinitionException(sprintf('The marking store of workflow "%s" can not store many places. But the transition "%s" has too many output (%d). Only one is accepted.', $name, $transition->getName(), count($transition->getTos())));
+            if (1 < \count($transition->getTos())) {
+                throw new InvalidDefinitionException(sprintf('The marking store of workflow "%s" can not store many places. But the transition "%s" has too many output (%d). Only one is accepted.', $name, $transition->getName(), \count($transition->getTos())));
             }
         }
     }
diff --git a/src/Symfony/Component/Yaml/Command/LintCommand.php b/src/Symfony/Component/Yaml/Command/LintCommand.php
index 8e3a848832e8..56bc96fcfd90 100644
--- a/src/Symfony/Component/Yaml/Command/LintCommand.php
+++ b/src/Symfony/Component/Yaml/Command/LintCommand.php
@@ -141,7 +141,7 @@ private function display(SymfonyStyle $io, array $files)
 
     private function displayTxt(SymfonyStyle $io, array $filesInfo)
     {
-        $countFiles = count($filesInfo);
+        $countFiles = \count($filesInfo);
         $erroredFiles = 0;
 
         foreach ($filesInfo as $info) {
@@ -188,7 +188,7 @@ private function getFiles($fileOrDirectory)
         }
 
         foreach ($this->getDirectoryIterator($fileOrDirectory) as $file) {
-            if (!in_array($file->getExtension(), array('yml', 'yaml'))) {
+            if (!\in_array($file->getExtension(), array('yml', 'yaml'))) {
                 continue;
             }
 
@@ -229,7 +229,7 @@ private function getDirectoryIterator($directory)
         };
 
         if (null !== $this->directoryIteratorProvider) {
-            return call_user_func($this->directoryIteratorProvider, $directory, $default);
+            return \call_user_func($this->directoryIteratorProvider, $directory, $default);
         }
 
         return $default($directory);
@@ -242,7 +242,7 @@ private function isReadable($fileOrDirectory)
         };
 
         if (null !== $this->isReadableProvider) {
-            return call_user_func($this->isReadableProvider, $fileOrDirectory, $default);
+            return \call_user_func($this->isReadableProvider, $fileOrDirectory, $default);
         }
 
         return $default($fileOrDirectory);
diff --git a/src/Symfony/Component/Yaml/Dumper.php b/src/Symfony/Component/Yaml/Dumper.php
index d47daa49c7b9..fdd34b618dc7 100644
--- a/src/Symfony/Component/Yaml/Dumper.php
+++ b/src/Symfony/Component/Yaml/Dumper.php
@@ -56,13 +56,13 @@ public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0):
             $dumpObjectAsInlineMap = empty((array) $input);
         }
 
-        if ($inline <= 0 || (!is_array($input) && $dumpObjectAsInlineMap) || empty($input)) {
+        if ($inline <= 0 || (!\is_array($input) && $dumpObjectAsInlineMap) || empty($input)) {
             $output .= $prefix.Inline::dump($input, $flags);
         } else {
             $dumpAsMap = Inline::isHash($input);
 
             foreach ($input as $key => $value) {
-                if ($inline >= 1 && Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && is_string($value) && false !== strpos($value, "\n") && false === strpos($value, "\r\n")) {
+                if ($inline >= 1 && Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value) && false !== strpos($value, "\n") && false === strpos($value, "\r\n")) {
                     // If the first line starts with a space character, the spec requires a blockIndicationIndicator
                     // http://www.yaml.org/spec/1.2/spec.html#id2793979
                     $blockIndentationIndicator = (' ' === substr($value, 0, 1)) ? (string) $this->indentation : '';
@@ -81,7 +81,7 @@ public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0):
                     $dumpObjectAsInlineMap = empty((array) $value);
                 }
 
-                $willBeInlined = $inline - 1 <= 0 || !is_array($value) && $dumpObjectAsInlineMap || empty($value);
+                $willBeInlined = $inline - 1 <= 0 || !\is_array($value) && $dumpObjectAsInlineMap || empty($value);
 
                 $output .= sprintf('%s%s%s%s',
                     $prefix,
diff --git a/src/Symfony/Component/Yaml/Escaper.php b/src/Symfony/Component/Yaml/Escaper.php
index 66e65bc618c2..4b2559ed6e97 100644
--- a/src/Symfony/Component/Yaml/Escaper.php
+++ b/src/Symfony/Component/Yaml/Escaper.php
@@ -78,7 +78,7 @@ public static function requiresSingleQuoting(string $value): bool
     {
         // Determines if a PHP value is entirely composed of a value that would
         // require single quoting in YAML.
-        if (in_array(strtolower($value), array('null', '~', 'true', 'false', 'y', 'n', 'yes', 'no', 'on', 'off'))) {
+        if (\in_array(strtolower($value), array('null', '~', 'true', 'false', 'y', 'n', 'yes', 'no', 'on', 'off'))) {
             return true;
         }
 
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 0c0433939cb3..261d6187a193 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Yaml;
 
-use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Exception\DumpException;
+use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Tag\TaggedValue;
 
 /**
@@ -122,7 +122,7 @@ public static function parse(string $value = null, int $flags = 0, array $refere
     public static function dump($value, int $flags = 0): string
     {
         switch (true) {
-            case is_resource($value):
+            case \is_resource($value):
                 if (Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE & $flags) {
                     throw new DumpException(sprintf('Unable to dump PHP resources in a YAML file ("%s").', get_resource_type($value)));
                 }
@@ -130,7 +130,7 @@ public static function dump($value, int $flags = 0): string
                 return 'null';
             case $value instanceof \DateTimeInterface:
                 return $value->format('c');
-            case is_object($value):
+            case \is_object($value):
                 if ($value instanceof TaggedValue) {
                     return '!'.$value->getTag().' '.self::dump($value->getValue(), $flags);
                 }
@@ -154,7 +154,7 @@ public static function dump($value, int $flags = 0): string
                 }
 
                 return 'null';
-            case is_array($value):
+            case \is_array($value):
                 return self::dumpArray($value, $flags);
             case null === $value:
                 return 'null';
@@ -163,13 +163,13 @@ public static function dump($value, int $flags = 0): string
             case false === $value:
                 return 'false';
             case ctype_digit($value):
-                return is_string($value) ? "'$value'" : (int) $value;
+                return \is_string($value) ? "'$value'" : (int) $value;
             case is_numeric($value):
                 $locale = setlocale(LC_NUMERIC, 0);
                 if (false !== $locale) {
                     setlocale(LC_NUMERIC, 'C');
                 }
-                if (is_float($value)) {
+                if (\is_float($value)) {
                     $repr = (string) $value;
                     if (is_infinite($value)) {
                         $repr = str_ireplace('INF', '.Inf', $repr);
@@ -178,7 +178,7 @@ public static function dump($value, int $flags = 0): string
                         $repr = '!!float '.$repr;
                     }
                 } else {
-                    $repr = is_string($value) ? "'$value'" : (string) $value;
+                    $repr = \is_string($value) ? "'$value'" : (string) $value;
                 }
                 if (false !== $locale) {
                     setlocale(LC_NUMERIC, $locale);
@@ -263,7 +263,7 @@ private static function dumpArray(array $value, int $flags): string
      */
     public static function parseScalar(string $scalar, int $flags = 0, array $delimiters = null, int &$i = 0, bool $evaluate = true, array $references = array())
     {
-        if (in_array($scalar[$i], array('"', "'"))) {
+        if (\in_array($scalar[$i], array('"', "'"))) {
             // quoted scalar
             $output = self::parseQuotedScalar($scalar, $i);
 
@@ -272,7 +272,7 @@ public static function parseScalar(string $scalar, int $flags = 0, array $delimi
                 if ('' === $tmp) {
                     throw new ParseException(sprintf('Unexpected end of line, expected one of "%s".', implode($delimiters)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                 }
-                if (!in_array($tmp[0], $delimiters)) {
+                if (!\in_array($tmp[0], $delimiters)) {
                     throw new ParseException(sprintf('Unexpected characters (%s).', substr($scalar, $i)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                 }
             }
@@ -280,7 +280,7 @@ public static function parseScalar(string $scalar, int $flags = 0, array $delimi
             // "normal" string
             if (!$delimiters) {
                 $output = substr($scalar, $i);
-                $i += strlen($output);
+                $i += \strlen($output);
 
                 // remove comments
                 if (Parser::preg_match('/[ \t]+#/', $output, $match, PREG_OFFSET_CAPTURE)) {
@@ -288,7 +288,7 @@ public static function parseScalar(string $scalar, int $flags = 0, array $delimi
                 }
             } elseif (Parser::preg_match('/^(.*?)('.implode('|', $delimiters).')/', substr($scalar, $i), $match)) {
                 $output = $match[1];
-                $i += strlen($output);
+                $i += \strlen($output);
                 $output = trim($output);
             } else {
                 throw new ParseException(sprintf('Malformed inline YAML string: %s.', $scalar), self::$parsedLineNumber + 1, null, self::$parsedFilename);
@@ -318,7 +318,7 @@ private static function parseQuotedScalar(string $scalar, int &$i): string
             throw new ParseException(sprintf('Malformed inline YAML string: %s.', substr($scalar, $i)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
         }
 
-        $output = substr($match[0], 1, strlen($match[0]) - 2);
+        $output = substr($match[0], 1, \strlen($match[0]) - 2);
 
         $unescaper = new Unescaper();
         if ('"' == $scalar[$i]) {
@@ -327,7 +327,7 @@ private static function parseQuotedScalar(string $scalar, int &$i): string
             $output = $unescaper->unescapeSingleQuotedString($output);
         }
 
-        $i += strlen($match[0]);
+        $i += \strlen($match[0]);
 
         return $output;
     }
@@ -340,7 +340,7 @@ private static function parseQuotedScalar(string $scalar, int &$i): string
     private static function parseSequence(string $sequence, int $flags, int &$i = 0, array $references = array()): array
     {
         $output = array();
-        $len = strlen($sequence);
+        $len = \strlen($sequence);
         ++$i;
 
         // [foo, bar, ...]
@@ -365,11 +365,11 @@ private static function parseSequence(string $sequence, int $flags, int &$i = 0,
                     $value = self::parseMapping($sequence, $flags, $i, $references);
                     break;
                 default:
-                    $isQuoted = in_array($sequence[$i], array('"', "'"));
+                    $isQuoted = \in_array($sequence[$i], array('"', "'"));
                     $value = self::parseScalar($sequence, $flags, array(',', ']'), $i, null === $tag, $references);
 
                     // the value can be an array if a reference has been resolved to an array var
-                    if (is_string($value) && !$isQuoted && false !== strpos($value, ': ')) {
+                    if (\is_string($value) && !$isQuoted && false !== strpos($value, ': ')) {
                         // embedded mapping?
                         try {
                             $pos = 0;
@@ -404,7 +404,7 @@ private static function parseSequence(string $sequence, int $flags, int &$i = 0,
     private static function parseMapping(string $mapping, int $flags, int &$i = 0, array $references = array())
     {
         $output = array();
-        $len = strlen($mapping);
+        $len = \strlen($mapping);
         ++$i;
         $allowOverwrite = false;
 
@@ -425,7 +425,7 @@ private static function parseMapping(string $mapping, int $flags, int &$i = 0, a
 
             // key
             $offsetBeforeKeyParsing = $i;
-            $isKeyQuoted = in_array($mapping[$i], array('"', "'"), true);
+            $isKeyQuoted = \in_array($mapping[$i], array('"', "'"), true);
             $key = self::parseScalar($mapping, $flags, array(':', ' '), $i, false, array());
 
             if ($offsetBeforeKeyParsing === $i) {
@@ -439,12 +439,12 @@ private static function parseMapping(string $mapping, int $flags, int &$i = 0, a
             if (!$isKeyQuoted) {
                 $evaluatedKey = self::evaluateScalar($key, $flags, $references);
 
-                if ('' !== $key && $evaluatedKey !== $key && !is_string($evaluatedKey) && !is_int($evaluatedKey)) {
+                if ('' !== $key && $evaluatedKey !== $key && !\is_string($evaluatedKey) && !\is_int($evaluatedKey)) {
                     throw new ParseException('Implicit casting of incompatible mapping keys to strings is not supported. Quote your evaluable mapping keys instead.', self::$parsedLineNumber + 1, $mapping);
                 }
             }
 
-            if (!$isKeyQuoted && (!isset($mapping[$i + 1]) || !in_array($mapping[$i + 1], array(' ', ',', '[', ']', '{', '}'), true))) {
+            if (!$isKeyQuoted && (!isset($mapping[$i + 1]) || !\in_array($mapping[$i + 1], array(' ', ',', '[', ']', '{', '}'), true))) {
                 throw new ParseException('Colons must be followed by a space or an indication character (i.e. " ", ",", "[", "]", "{", "}").', self::$parsedLineNumber + 1, $mapping);
             }
 
@@ -588,8 +588,8 @@ private static function evaluateScalar(string $scalar, int $flags, array $refere
                     case 0 === strpos($scalar, '!php/const'):
                         if (self::$constantSupport) {
                             $i = 0;
-                            if (defined($const = self::parseScalar(substr($scalar, 11), 0, null, $i, false))) {
-                                return constant($const);
+                            if (\defined($const = self::parseScalar(substr($scalar, 11), 0, null, $i, false))) {
+                                return \constant($const);
                             }
 
                             throw new ParseException(sprintf('The constant "%s" is not defined.', $const), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
@@ -668,7 +668,7 @@ private static function parseTag(string $value, int &$i, int $flags): ?string
         $nextOffset += strspn($value, ' ', $nextOffset);
 
         // Is followed by a scalar and is a built-in tag
-        if ($tag && (!isset($value[$nextOffset]) || !in_array($value[$nextOffset], array('[', '{'), true)) && ('!' === $tag[0] || 'str' === $tag || 'php/const' === $tag || 'php/object' === $tag)) {
+        if ($tag && (!isset($value[$nextOffset]) || !\in_array($value[$nextOffset], array('[', '{'), true)) && ('!' === $tag[0] || 'str' === $tag || 'php/const' === $tag || 'php/object' === $tag)) {
             // Manage in {@link self::evaluateScalar()}
             return null;
         }
@@ -691,8 +691,8 @@ public static function evaluateBinaryScalar(string $scalar): string
     {
         $parsedBinaryData = self::parseScalar(preg_replace('/\s/', '', $scalar));
 
-        if (0 !== (strlen($parsedBinaryData) % 4)) {
-            throw new ParseException(sprintf('The normalized base64 encoded data (data without whitespace characters) length must be a multiple of four (%d bytes given).', strlen($parsedBinaryData)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
+        if (0 !== (\strlen($parsedBinaryData) % 4)) {
+            throw new ParseException(sprintf('The normalized base64 encoded data (data without whitespace characters) length must be a multiple of four (%d bytes given).', \strlen($parsedBinaryData)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
         }
 
         if (!Parser::preg_match('#^[A-Z0-9+/]+={0,2}$#i', $parsedBinaryData)) {
diff --git a/src/Symfony/Component/Yaml/Parser.php b/src/Symfony/Component/Yaml/Parser.php
index 7caedbeabe0b..35e7443d1316 100644
--- a/src/Symfony/Component/Yaml/Parser.php
+++ b/src/Symfony/Component/Yaml/Parser.php
@@ -126,7 +126,7 @@ private function doParse(string $value, int $flags)
         $this->locallySkippedLineNumbers = array();
 
         if (null === $this->totalNumberOfLines) {
-            $this->totalNumberOfLines = count($this->lines);
+            $this->totalNumberOfLines = \count($this->lines);
         }
 
         if (!$this->moveToNextLine()) {
@@ -191,7 +191,7 @@ private function doParse(string $value, int $flags)
                         // this is a compact notation element, add to next block and parse
                         $block = $values['value'];
                         if ($this->isNextLineIndented()) {
-                            $block .= "\n".$this->getNextEmbedBlock($this->getCurrentLineIndentation() + strlen($values['leadspaces']) + 1);
+                            $block .= "\n".$this->getNextEmbedBlock($this->getCurrentLineIndentation() + \strlen($values['leadspaces']) + 1);
                         }
 
                         $data[] = $this->parseBlock($this->getRealCurrentLineNb(), $block, $flags);
@@ -204,7 +204,7 @@ private function doParse(string $value, int $flags)
                 }
             } elseif (
                 self::preg_match('#^(?P<key>(?:![^\s]++\s++)?(?:'.Inline::REGEX_QUOTED_STRING.'|(?:!?!php/const:)?[^ \'"\[\{!].*?)) *\:(\s++(?P<value>.+))?$#u', rtrim($this->currentLine), $values)
-                && (false === strpos($values['key'], ' #') || in_array($values['key'][0], array('"', "'")))
+                && (false === strpos($values['key'], ' #') || \in_array($values['key'][0], array('"', "'")))
             ) {
                 if ($context && 'sequence' == $context) {
                     throw new ParseException('You cannot define a mapping item when in a sequence', $this->currentLineNb + 1, $this->currentLine, $this->filename);
@@ -220,12 +220,12 @@ private function doParse(string $value, int $flags)
                     throw $e;
                 }
 
-                if (!is_string($key) && !is_int($key)) {
+                if (!\is_string($key) && !\is_int($key)) {
                     throw new ParseException(sprintf('%s keys are not supported. Quote your evaluable mapping keys instead.', is_numeric($key) ? 'Numeric' : 'Non-string'), $this->getRealCurrentLineNb() + 1, $this->currentLine);
                 }
 
                 // Convert float keys to strings, to avoid being converted to integers by PHP
-                if (is_float($key)) {
+                if (\is_float($key)) {
                     $key = (string) $key;
                 }
 
@@ -244,7 +244,7 @@ private function doParse(string $value, int $flags)
                             $refValue = (array) $refValue;
                         }
 
-                        if (!is_array($refValue)) {
+                        if (!\is_array($refValue)) {
                             throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename);
                         }
 
@@ -261,7 +261,7 @@ private function doParse(string $value, int $flags)
                             $parsed = (array) $parsed;
                         }
 
-                        if (!is_array($parsed)) {
+                        if (!\is_array($parsed)) {
                             throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename);
                         }
 
@@ -274,7 +274,7 @@ private function doParse(string $value, int $flags)
                                     $parsedItem = (array) $parsedItem;
                                 }
 
-                                if (!is_array($parsedItem)) {
+                                if (!\is_array($parsedItem)) {
                                     throw new ParseException('Merge items must be arrays.', $this->getRealCurrentLineNb() + 1, $parsedItem, $this->filename);
                                 }
 
@@ -357,7 +357,7 @@ private function doParse(string $value, int $flags)
                 }
 
                 // 1-liner optionally followed by newline(s)
-                if (is_string($value) && $this->lines[0] === trim($value)) {
+                if (\is_string($value) && $this->lines[0] === trim($value)) {
                     try {
                         $value = Inline::parse($this->lines[0], $flags, $this->refs);
                     } catch (ParseException $e) {
@@ -420,7 +420,7 @@ private function doParse(string $value, int $flags)
             $data = new TaggedValue($tag, $data);
         }
 
-        if (Yaml::PARSE_OBJECT_FOR_MAP & $flags && !is_object($data) && 'mapping' === $context) {
+        if (Yaml::PARSE_OBJECT_FOR_MAP & $flags && !\is_object($data) && 'mapping' === $context) {
             $object = new \stdClass();
 
             foreach ($data as $key => $value) {
@@ -483,7 +483,7 @@ public function getRealCurrentLineNb(): int
      */
     private function getCurrentLineIndentation(): int
     {
-        return strlen($this->currentLine) - strlen(ltrim($this->currentLine, ' '));
+        return \strlen($this->currentLine) - \strlen(ltrim($this->currentLine, ' '));
     }
 
     /**
@@ -619,7 +619,7 @@ private function getNextEmbedBlock(int $indentation = null, bool $inSequence = f
      */
     private function moveToNextLine(): bool
     {
-        if ($this->currentLineNb >= count($this->lines) - 1) {
+        if ($this->currentLineNb >= \count($this->lines) - 1) {
             return false;
         }
 
@@ -713,7 +713,7 @@ private function parseValue(string $value, int $flags, string $context)
                 }
             }
 
-            for ($i = 0, $linesCount = count($lines), $previousLineBlank = false; $i < $linesCount; ++$i) {
+            for ($i = 0, $linesCount = \count($lines), $previousLineBlank = false; $i < $linesCount; ++$i) {
                 if ('' === $lines[$i]) {
                     $value .= "\n";
                     $previousLineBlank = true;
@@ -730,7 +730,7 @@ private function parseValue(string $value, int $flags, string $context)
 
             $parsedValue = Inline::parse($value, $flags, $this->refs);
 
-            if ('mapping' === $context && is_string($parsedValue) && '"' !== $value[0] && "'" !== $value[0] && '[' !== $value[0] && '{' !== $value[0] && '!' !== $value[0] && false !== strpos($parsedValue, ': ')) {
+            if ('mapping' === $context && \is_string($parsedValue) && '"' !== $value[0] && "'" !== $value[0] && '[' !== $value[0] && '{' !== $value[0] && '!' !== $value[0] && false !== strpos($parsedValue, ': ')) {
                 throw new ParseException('A colon cannot be used in an unquoted mapping value.', $this->getRealCurrentLineNb() + 1, $value, $this->filename);
             }
 
@@ -774,7 +774,7 @@ private function parseBlockScalar(string $style, string $chomping = '', int $ind
         // determine indentation if not specified
         if (0 === $indentation) {
             if (self::preg_match('/^ +/', $this->currentLine, $matches)) {
-                $indentation = strlen($matches[0]);
+                $indentation = \strlen($matches[0]);
             }
         }
 
@@ -787,7 +787,7 @@ private function parseBlockScalar(string $style, string $chomping = '', int $ind
                     self::preg_match($pattern, $this->currentLine, $matches)
                 )
             ) {
-                if ($isCurrentLineBlank && strlen($this->currentLine) > $indentation) {
+                if ($isCurrentLineBlank && \strlen($this->currentLine) > $indentation) {
                     $blockLines[] = substr($this->currentLine, $indentation);
                 } elseif ($isCurrentLineBlank) {
                     $blockLines[] = '';
@@ -817,7 +817,7 @@ private function parseBlockScalar(string $style, string $chomping = '', int $ind
             $previousLineIndented = false;
             $previousLineBlank = false;
 
-            for ($i = 0, $blockLinesCount = count($blockLines); $i < $blockLinesCount; ++$i) {
+            for ($i = 0, $blockLinesCount = \count($blockLines); $i < $blockLinesCount; ++$i) {
                 if ('' === $blockLines[$i]) {
                     $text .= "\n";
                     $previousLineIndented = false;
diff --git a/src/Symfony/Component/Yaml/Tests/Command/LintCommandTest.php b/src/Symfony/Component/Yaml/Tests/Command/LintCommandTest.php
index 5d0f44d5f0a6..a5baf234ef3d 100644
--- a/src/Symfony/Component/Yaml/Tests/Command/LintCommandTest.php
+++ b/src/Symfony/Component/Yaml/Tests/Command/LintCommandTest.php
@@ -12,10 +12,10 @@
 namespace Symfony\Component\Yaml\Tests\Command;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Yaml\Command\LintCommand;
 use Symfony\Component\Console\Application;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Tester\CommandTester;
+use Symfony\Component\Yaml\Command\LintCommand;
 
 /**
  * Tests the YamlLintCommand.
diff --git a/src/Symfony/Component/Yaml/Tests/DumperTest.php b/src/Symfony/Component/Yaml/Tests/DumperTest.php
index 0a8c023d017f..85dfd5b956cf 100644
--- a/src/Symfony/Component/Yaml/Tests/DumperTest.php
+++ b/src/Symfony/Component/Yaml/Tests/DumperTest.php
@@ -12,8 +12,8 @@
 namespace Symfony\Component\Yaml\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Yaml\Parser;
 use Symfony\Component\Yaml\Dumper;
+use Symfony\Component\Yaml\Parser;
 use Symfony\Component\Yaml\Yaml;
 
 class DumperTest extends TestCase
diff --git a/src/Symfony/Component/Yaml/Tests/Fixtures/escapedCharacters.yml b/src/Symfony/Component/Yaml/Tests/Fixtures/escapedCharacters.yml
index 6ca044c8da1b..cc0356d36aec 100644
--- a/src/Symfony/Component/Yaml/Tests/Fixtures/escapedCharacters.yml
+++ b/src/Symfony/Component/Yaml/Tests/Fixtures/escapedCharacters.yml
@@ -4,7 +4,7 @@ yaml: |
 php: |
     "\\0 \\ \\a \\b \\n"
 ---
-test: null
+test: 'null'
 yaml: |
     "\0"
 php: |
diff --git a/src/Symfony/Component/Yaml/Tests/ParserTest.php b/src/Symfony/Component/Yaml/Tests/ParserTest.php
index 102ff1244348..16ad0afe7e37 100644
--- a/src/Symfony/Component/Yaml/Tests/ParserTest.php
+++ b/src/Symfony/Component/Yaml/Tests/ParserTest.php
@@ -13,9 +13,9 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Yaml\Exception\ParseException;
-use Symfony\Component\Yaml\Yaml;
 use Symfony\Component\Yaml\Parser;
 use Symfony\Component\Yaml\Tag\TaggedValue;
+use Symfony\Component\Yaml\Yaml;
 
 class ParserTest extends TestCase
 {
@@ -1941,7 +1941,7 @@ public function testParsingNonExistentFilesThrowsException()
      */
     public function testParsingNotReadableFilesThrowsException()
     {
-        if ('\\' === DIRECTORY_SEPARATOR) {
+        if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('chmod is not supported on Windows');
         }
 
diff --git a/src/Symfony/Component/Yaml/Unescaper.php b/src/Symfony/Component/Yaml/Unescaper.php
index 78b8bacada9c..9c3a19ec5ea0 100644
--- a/src/Symfony/Component/Yaml/Unescaper.php
+++ b/src/Symfony/Component/Yaml/Unescaper.php
@@ -124,15 +124,15 @@ private function unescapeCharacter(string $value): string
     private static function utf8chr(int $c): string
     {
         if (0x80 > $c %= 0x200000) {
-            return chr($c);
+            return \chr($c);
         }
         if (0x800 > $c) {
-            return chr(0xC0 | $c >> 6).chr(0x80 | $c & 0x3F);
+            return \chr(0xC0 | $c >> 6).\chr(0x80 | $c & 0x3F);
         }
         if (0x10000 > $c) {
-            return chr(0xE0 | $c >> 12).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
+            return \chr(0xE0 | $c >> 12).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
         }
 
-        return chr(0xF0 | $c >> 18).chr(0x80 | $c >> 12 & 0x3F).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
+        return \chr(0xF0 | $c >> 18).\chr(0x80 | $c >> 12 & 0x3F).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
     }
 }