diff --git a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/CachePoolClearerCacheWarmer.php b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/CachePoolClearerCacheWarmer.php
index 0e5997996004f..79bca240339b7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/CachePoolClearerCacheWarmer.php
+++ b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/CachePoolClearerCacheWarmer.php
@@ -28,6 +28,9 @@ final class CachePoolClearerCacheWarmer implements CacheWarmerInterface
     private $poolClearer;
     private $pools;
 
+    /**
+     * @param string[] $pools
+     */
     public function __construct(Psr6CacheClearer $poolClearer, array $pools = [])
     {
         $this->poolClearer = $poolClearer;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolClearCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolClearCommand.php
index 75898de27d7bf..b72924dfa78d6 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolClearCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolClearCommand.php
@@ -35,6 +35,9 @@ final class CachePoolClearCommand extends Command
     private $poolClearer;
     private $poolNames;
 
+    /**
+     * @param string[]|null $poolNames
+     */
     public function __construct(Psr6CacheClearer $poolClearer, array $poolNames = null)
     {
         parent::__construct();
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolDeleteCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolDeleteCommand.php
index c9ac7c497b9f1..b36d48cfe3973 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolDeleteCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolDeleteCommand.php
@@ -33,6 +33,9 @@ final class CachePoolDeleteCommand extends Command
     private $poolClearer;
     private $poolNames;
 
+    /**
+     * @param string[]|null $poolNames
+     */
     public function __construct(Psr6CacheClearer $poolClearer, array $poolNames = null)
     {
         parent::__construct();
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolListCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolListCommand.php
index 4a4b1eb2fa49e..0ad33241deb73 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolListCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolListCommand.php
@@ -28,6 +28,9 @@ final class CachePoolListCommand extends Command
 
     private $poolNames;
 
+    /**
+     * @param string[] $poolNames
+     */
     public function __construct(array $poolNames)
     {
         parent::__construct();
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolPruneCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolPruneCommand.php
index bfe4a444d99ac..8d10352942fb5 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolPruneCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/CachePoolPruneCommand.php
@@ -30,7 +30,7 @@ final class CachePoolPruneCommand extends Command
     private $pools;
 
     /**
-     * @param iterable|PruneableInterface[] $pools
+     * @param iterable<mixed, PruneableInterface> $pools
      */
     public function __construct(iterable $pools)
     {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php
index 0edaf661e222b..6cceb945dd96f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php
@@ -18,6 +18,7 @@
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
 use Symfony\Component\Routing\Matcher\TraceableUrlMatcher;
 use Symfony\Component\Routing\RouterInterface;
 
@@ -36,6 +37,9 @@ class RouterMatchCommand extends Command
     private $router;
     private $expressionLanguageProviders;
 
+    /**
+     * @param iterable<mixed, ExpressionFunctionProviderInterface> $expressionLanguageProviders
+     */
     public function __construct(RouterInterface $router, iterable $expressionLanguageProviders = [])
     {
         parent::__construct();
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
index 392a95ce64b5f..a556599e76d0c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/UnusedTagsPass.php
@@ -21,7 +21,7 @@
  */
 class UnusedTagsPass implements CompilerPassInterface
 {
-    private $knownTags = [
+    private const KNOWN_TAGS = [
         'annotations.cached_reader',
         'assets.package',
         'auto_alias',
@@ -74,10 +74,10 @@ class UnusedTagsPass implements CompilerPassInterface
         'routing.expression_language_provider',
         'routing.loader',
         'routing.route_loader',
+        'security.authenticator.login_linker',
         'security.expression_language_provider',
         'security.remember_me_aware',
         'security.remember_me_handler',
-        'security.authenticator.login_linker',
         'security.voter',
         'serializer.encoder',
         'serializer.normalizer',
@@ -96,11 +96,11 @@ class UnusedTagsPass implements CompilerPassInterface
 
     public function process(ContainerBuilder $container)
     {
-        $tags = array_unique(array_merge($container->findTags(), $this->knownTags));
+        $tags = array_unique(array_merge($container->findTags(), self::KNOWN_TAGS));
 
         foreach ($container->findUnusedTags() as $tag) {
             // skip known tags
-            if (\in_array($tag, $this->knownTags)) {
+            if (\in_array($tag, self::KNOWN_TAGS)) {
                 continue;
             }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/bin/check-unused-known-tags.php b/src/Symfony/Bundle/FrameworkBundle/Resources/bin/check-unused-known-tags.php
index ec9ae1f97c0ff..4920c43ebe182 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/bin/check-unused-known-tags.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/bin/check-unused-known-tags.php
@@ -15,5 +15,5 @@
 
 $target = dirname(__DIR__, 2).'/DependencyInjection/Compiler/UnusedTagsPass.php';
 $contents = file_get_contents($target);
-$contents = preg_replace('{private \$knownTags = \[(.+?)\];}sm', "private \$knownTags = [\n        '".implode("',\n        '", UnusedTagsPassUtils::getDefinedTags())."',\n    ];", $contents);
+$contents = preg_replace('{private const KNOWN_TAGS = \[(.+?)\];}sm', "private const KNOWN_TAGS = [\n        '".implode("',\n        '", UnusedTagsPassUtils::getDefinedTags())."',\n    ];", $contents);
 file_put_contents($target, $contents);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
index 19088135c6542..585e6ee130deb 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
@@ -49,9 +49,9 @@ public function __construct(ContainerInterface $container, $resource, array $opt
         $this->setOptions($options);
 
         if ($parameters) {
-            $this->paramFetcher = [$parameters, 'get'];
+            $this->paramFetcher = \Closure::fromCallable([$parameters, 'get']);
         } elseif ($container instanceof SymfonyContainerInterface) {
-            $this->paramFetcher = [$container, 'getParameter'];
+            $this->paramFetcher = \Closure::fromCallable([$container, 'getParameter']);
         } else {
             throw new \LogicException(sprintf('You should either pass a "%s" instance or provide the $parameters argument of the "%s" method.', SymfonyContainerInterface::class, __METHOD__));
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/UnusedTagsPassTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/UnusedTagsPassTest.php
index 89a35285ba234..433b798d81a94 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/UnusedTagsPassTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/UnusedTagsPassTest.php
@@ -43,13 +43,13 @@ public function testMissingKnownTags()
 
     private function getKnownTags(): array
     {
-        // get tags in UnusedTagsPass
-        $target = \dirname(__DIR__, 3).'/DependencyInjection/Compiler/UnusedTagsPass.php';
-        $contents = file_get_contents($target);
-        preg_match('{private \$knownTags = \[(.+?)\];}sm', $contents, $matches);
-        $tags = array_values(array_filter(array_map(function ($str) {
-            return trim(preg_replace('{^ +\'(.+)\',}', '$1', $str));
-        }, explode("\n", $matches[1]))));
+        $tags = \Closure::bind(
+            static function () {
+                return UnusedTagsPass::KNOWN_TAGS;
+            },
+            null,
+            UnusedTagsPass::class
+        )();
         sort($tags);
 
         return $tags;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
index 0c4deee36d8d3..5173f8a8efb51 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
@@ -36,7 +36,7 @@ class Translator extends BaseTranslator implements WarmableInterface
     ];
 
     /**
-     * @var array
+     * @var list<string>
      */
     private $resourceLocales;
 
@@ -44,10 +44,13 @@ class Translator extends BaseTranslator implements WarmableInterface
      * Holds parameters from addResource() calls so we can defer the actual
      * parent::addResource() calls until initialize() is executed.
      *
-     * @var array
+     * @var array[]
      */
     private $resources = [];
 
+    /**
+     * @var string[][]
+     */
     private $resourceFiles;
 
     /**
@@ -152,7 +155,7 @@ protected function initialize()
         if ($this->resourceFiles) {
             $this->addResourceFiles();
         }
-        foreach ($this->resources as $key => $params) {
+        foreach ($this->resources as $params) {
             [$format, $resource, $locale, $domain] = $params;
             parent::addResource($format, $resource, $locale, $domain);
         }
@@ -165,13 +168,13 @@ protected function initialize()
         }
     }
 
-    private function addResourceFiles()
+    private function addResourceFiles(): void
     {
         $filesByLocale = $this->resourceFiles;
         $this->resourceFiles = [];
 
-        foreach ($filesByLocale as $locale => $files) {
-            foreach ($files as $key => $file) {
+        foreach ($filesByLocale as $files) {
+            foreach ($files as $file) {
                 // filename is domain.locale.format
                 $fileNameParts = explode('.', basename($file));
                 $format = array_pop($fileNameParts);