UPGRADE FROM 2.x to 3.0

ClassLoader

The UniversalClassLoader class has been removed in favor of ClassLoader. The only difference is that some method names are different:
- registerNamespaces() -> addPrefixes()
- registerPrefixes() -> addPrefixes()
- registerNamespaces() -> addPrefix()
- registerPrefixes() -> addPrefix()
- getNamespaces() -> getPrefixes()
- getNamespaceFallbacks() -> getFallbackDirs()
- getPrefixFallbacks() -> getFallbackDirs()
The DebugUniversalClassLoader class has been removed in favor of DebugClassLoader. The difference is that the constructor now takes a loader to wrap.

Form

The methods Form::bind() and Form::isBound() were removed. You should use Form::submit() and Form::isSubmitted() instead.

Before:
```
$form->bind(array(...));
```
After:
```
$form->submit(array(...));
```
Passing a Symfony\Component\HttpFoundation\Request instance, as was supported by FormInterface::bind(), is not possible with FormInterface::submit() anymore. You should use FormInterface::handleRequest() instead.

Before:
```
if ('POST' === $request->getMethod()) {
    $form->bind($request);

    if ($form->isValid()) {
        // ...
    }
}
```
After:
```
$form->handleRequest($request);

if ($form->isValid()) {
    // ...
}
```
If you want to test whether the form was submitted separately, you can use the method isSubmitted():
```
$form->handleRequest($request);

if ($form->isSubmitted()) {
   // ...

   if ($form->isValid()) {
       // ...
   }
}
```

The events PRE_BIND, BIND and POST_BIND were renamed to PRE_SUBMIT, SUBMIT and POST_SUBMIT.

Before:

$builder->addEventListener(FormEvents::PRE_BIND, function (FormEvent $event) {
    // ...
});

After:

$builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) {
    // ...
});

The option "virtual" was renamed to "inherit_data".

Before:

$builder->add('address', 'form', array(
    'virtual' => true,
));

After:

$builder->add('address', 'form', array(
    'inherit_data' => true,
));

The class VirtualFormAwareIterator was renamed to InheritDataAwareIterator.

Before:

use Symfony\Component\Form\Util\VirtualFormAwareIterator;

$iterator = new VirtualFormAwareIterator($forms);

After:

use Symfony\Component\Form\Util\InheritDataAwareIterator;

$iterator = new InheritDataAwareIterator($forms);

The TypeTestCase class was moved from the Symfony\Component\Form\Tests\Extension\Core\Type namespace to the Symfony\Component\Form\Test namespace.

Before:

use Symfony\Component\Form\Tests\Extension\Core\Type\TypeTestCase

class MyTypeTest extends TypeTestCase
{
    // ...
}

After:

use Symfony\Component\Form\Test\TypeTestCase;

class MyTypeTest extends TypeTestCase
{
    // ...
}

The FormItegrationTestCase and FormPerformanceTestCase classes were moved form the Symfony\Component\Form\Tests namespace to the Symfony\Component\Form\Test namespace.

FrameworkBundle

The enctype method of the form helper was removed. You should use the new method start instead.

Before:

<form method="post" action="http://example.com" <?php echo $view['form']->enctype($form) ?>>
    ...
</form>

After:

<?php echo $view['form']->start($form) ?>
    ...
<?php echo $view['form']->end($form) ?>

The method and action of the form default to "POST" and the current document. If you want to change these values, you can set them explicitly in the controller.

Alternative 1:

$form = $this->createForm('my_form', $formData, array(
    'method' => 'PUT',
    'action' => $this->generateUrl('target_route'),
));

Alternative 2:

$form = $this->createFormBuilder($formData)
    // ...
    ->setMethod('PUT')
    ->setAction($this->generateUrl('target_route'))
    ->getForm();

It is also possible to override the method and the action in the template:

<?php echo $view['form']->start($form, array('method' => 'GET', 'action' => 'http://example.com')) ?>
    ...
<?php echo $view['form']->end($form) ?>

HttpKernel

The Symfony\Component\HttpKernel\Log\LoggerInterface has been removed in favor of Psr\Log\LoggerInterface. The only difference is that some method names are different:
- emerg() -> emergency()
- crit() -> critical()
- err() -> error()
- warn() -> warning()
The previous method renames also happened to the following classes:
- Symfony\Bridge\Monolog\Logger
- Symfony\Component\HttpKernel\Log\NullLogger
The Symfony\Component\HttpKernel\Kernel::init() method has been removed.
The following classes have been renamed as they have been moved to the Debug component:
- Symfony\Component\HttpKernel\Debug\ErrorHandler -> Symfony\Component\Debug\ErrorHandler
- Symfony\Component\HttpKernel\Debug\ExceptionHandler -> Symfony\Component\Debug\ExceptionHandler
- Symfony\Component\HttpKernel\Exception\FatalErrorException -> Symfony\Component\Debug\Exception\FatalErrorException
- Symfony\Component\HttpKernel\Exception\FlattenException -> Symfony\Component\Debug\Exception\FlattenException
The Symfony\Component\HttpKernel\EventListener\ExceptionListener now passes the Request format as the _format argument instead of format.

Locale

The Locale component was removed and replaced by the Intl component. Instead of the methods in Symfony\Component\Locale\Locale, you should use these equivalent methods in Symfony\Component\Intl\Intl now:
- Locale::getDisplayCountries() -> Intl::getRegionBundle()->getCountryNames()
- Locale::getCountries() -> array_keys(Intl::getRegionBundle()->getCountryNames())
- Locale::getDisplayLanguages() -> Intl::getLanguageBundle()->getLanguageNames()
- Locale::getLanguages() -> array_keys(Intl::getLanguageBundle()->getLanguageNames())
- Locale::getDisplayLocales() -> Intl::getLocaleBundle()->getLocaleNames()
- Locale::getLocales() -> array_keys(Intl::getLocaleBundle()->getLocaleNames())

PropertyAccess

Renamed PropertyAccess::getPropertyAccessor to createPropertyAccessor.

Before:

use Symfony\Component\PropertyAccess\PropertyAccess;

$accessor = PropertyAccess::getPropertyAccessor();

After:

use Symfony\Component\PropertyAccess\PropertyAccess;

$accessor = PropertyAccess::createPropertyAccessor();

Routing

Some route settings have been renamed:

The pattern setting for a route has been deprecated in favor of path
The _scheme and _method requirements have been moved to the schemes and methods settings

Before:

article_edit:
    pattern: /article/{id}
    requirements: { '_method': 'POST|PUT', '_scheme': 'https', 'id': '\d+' }

<route id="article_edit" pattern="/article/{id}">
    <requirement key="_method">POST|PUT</requirement>
    <requirement key="_scheme">https</requirement>
    <requirement key="id">\d+</requirement>
</route>

$route = new Route();
$route->setPattern('/article/{id}');
$route->setRequirement('_method', 'POST|PUT');
$route->setRequirement('_scheme', 'https');

After:

article_edit:
    path: /article/{id}
    methods: [POST, PUT]
    schemes: https
    requirements: { 'id': '\d+' }

<route id="article_edit" path="/article/{id}" methods="POST PUT" schemes="https">
    <requirement key="id">\d+</requirement>
</route>

$route = new Route();
$route->setPath('/article/{id}');
$route->setMethods(array('POST', 'PUT'));
$route->setSchemes('https');

Translator

The Translator::setFallbackLocale() method has been removed in favor of Translator::setFallbackLocales().

Twig Bridge

The render tag is deprecated in favor of the render function.

The form_enctype helper was removed. You should use the new form_start function instead.

Before:

<form method="post" action="http://example.com" {{ form_enctype(form) }}>
    ...
</form>

After:

{{ form_start(form) }}
    ...
{{ form_end(form) }}

The method and action of the form default to "POST" and the current document. If you want to change these values, you can set them explicitly in the controller.

Alternative 1:

$form = $this->createForm('my_form', $formData, array(
    'method' => 'PUT',
    'action' => $this->generateUrl('target_route'),
));

Alternative 2:

$form = $this->createFormBuilder($formData)
    // ...
    ->setMethod('PUT')
    ->setAction($this->generateUrl('target_route'))
    ->getForm();

It is also possible to override the method and the action in the template:

{{ form_start(form, {'method': 'GET', 'action': 'http://example.com'}) }}
    ...
{{ form_end(form) }}

Validator

The constraints Optional and Required were moved to the Symfony\Component\Validator\Constraints\ namespace. You should adapt the path wherever you used them.

Before:

use Symfony\Component\Validator\Constraints as Assert;

/**
 * @Assert\Collection({
 *     "foo" = @Assert\Collection\Required(),
 *     "bar" = @Assert\Collection\Optional(),
 * })
 */
private $property;

After:

use Symfony\Component\Validator\Constraints as Assert;

/**
 * @Assert\Collection({
 *     "foo" = @Assert\Required(),
 *     "bar" = @Assert\Optional(),
 * })
 */
private $property;

Yaml

The ability to pass file names to Yaml::parse() has been removed.

Before:
```
Yaml::parse($fileName);
```
After:
```
Yaml::parse(file_get_contents($fileName));
```

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