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:

Old name	New name
`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.

Console

The dialog helper has been removed in favor of the question helper.
The methods isQuiet, isVerbose, isVeryVerbose and isDebug were added to Symfony\Component\Console\Output\OutputInterface.

ProgressHelper has been removed in favor of ProgressBar.

Before:

$h = new ProgressHelper();
$h->start($output, 10);
for ($i = 1; $i < 5; $i++) {
    usleep(200000);
    $h->advance();
}
$h->finish();

After:

$bar = new ProgressBar($output, 10);
$bar->start();
for ($i = 1; $i < 5; $i++) {
    usleep(200000);
    $bar->advance();
}

TableHelper has been removed in favor of Table.

Before:

$table = $app->getHelperSet()->get('table');
$table
    ->setHeaders(array('ISBN', 'Title', 'Author'))
    ->setRows(array(
        array('99921-58-10-7', 'Divine Comedy', 'Dante Alighieri'),
        array('9971-5-0210-0', 'A Tale of Two Cities', 'Charles Dickens'),
        array('960-425-059-0', 'The Lord of the Rings', 'J. R. R. Tolkien'),
        array('80-902734-1-6', 'And Then There Were None', 'Agatha Christie'),
    ))
;
$table->render($output);

After:

use Symfony\Component\Console\Helper\Table;

$table = new Table($output);
$table
    ->setHeaders(array('ISBN', 'Title', 'Author'))
    ->setRows(array(
        array('99921-58-10-7', 'Divine Comedy', 'Dante Alighieri'),
        array('9971-5-0210-0', 'A Tale of Two Cities', 'Charles Dickens'),
        array('960-425-059-0', 'The Lord of the Rings', 'J. R. R. Tolkien'),
        array('80-902734-1-6', 'And Then There Were None', 'Agatha Christie'),
    ))
;
$table->render();

Parameters of renderException() method of the Symfony\Component\Console\Application are type hinted. You must add the type hint to your implementations.

DependencyInjection

The method remove was added to Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface.
The methods Definition::setFactoryClass(), Definition::setFactoryMethod(), and Definition::setFactoryService() have been removed in favor of Definition::setFactory(). Services defined using YAML or XML use the same syntax as configurators.
Synchronized services are deprecated and the following methods have been removed: ContainerBuilder::synchronize(), Definition::isSynchronized(), and Definition::setSynchronized().

EventDispatcher

The interface Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcherInterface extends Symfony\Component\EventDispatcher\EventDispatcherInterface.

Form

The option "precision" was renamed to "scale".

Before:

$builder->add('length', 'number', array(
   'precision' => 3,
));

After:

$builder->add('length', 'number', array(
   'scale' => 3,
));

The method AbstractType::setDefaultOptions(OptionsResolverInterface $resolver) and AbstractTypeExtension::setDefaultOptions(OptionsResolverInterface $resolver) have been renamed. You should use AbstractType::configureOptions(OptionsResolver $resolver) and AbstractTypeExtension::configureOptions(OptionsResolver $resolver) instead.
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 FormIntegrationTestCase and FormPerformanceTestCase classes were moved form the Symfony\Component\Form\Tests namespace to the Symfony\Component\Form\Test namespace.
The constants ROUND_HALFEVEN, ROUND_HALFUP and ROUND_HALFDOWN in class NumberToLocalizedStringTransformer were renamed to ROUND_HALF_EVEN, ROUND_HALF_UP and ROUND_HALF_DOWN.
The methods ChoiceListInterface::getIndicesForChoices() and ChoiceListInterface::getIndicesForValues() were removed. No direct replacement exists, although in most cases ChoiceListInterface::getChoicesForValues() and ChoiceListInterface::getValuesForChoices() should be sufficient.
The interface Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface and all of its implementations were removed. Use the new interface Symfony\Component\Security\Csrf\CsrfTokenManagerInterface instead.
The options "csrf_provider" and "intention" were renamed to "csrf_token_generator" and "csrf_token_id".
The method Form::getErrorsAsString() was removed. Use Form::getErrors() instead with the argument $deep set to true and $flatten set to false and cast the returned iterator to a string (if not done implicitly by PHP).

Before:
```
echo $form->getErrorsAsString();
```
After:
```
echo $form->getErrors(true, false);
```
- The Symfony\Component\Form\Extension\Core\ChoiceList\ChoiceList class has been removed in favor of Symfony\Component\Form\ChoiceList\ArrayChoiceList.
- The Symfony\Component\Form\Extension\Core\ChoiceList\LazyChoiceList class has been removed in favor of Symfony\Component\Form\ChoiceList\LazyChoiceList.
- The Symfony\Component\Form\Extension\Core\ChoiceList\ObjectChoiceList class has been removed in favor of Symfony\Component\Form\ChoiceList\ArrayChoiceList.
- The Symfony\Component\Form\Extension\Core\ChoiceList\SimpleChoiceList class has been removed in favor of Symfony\Component\Form\ChoiceList\ArrayChoiceList.

FrameworkBundle

The config:debug, container:debug, router:debug, translation:debug and yaml:lint commands have been deprecated since Symfony 2.7 and will be removed in Symfony 3.0. Use the debug:config, debug:container, debug:router, debug:translation and lint:yaml commands instead.

The getRequest method of the base Controller class has been deprecated since Symfony 2.4 and must be therefore removed in 3.0. The only reliable way to get the Request object is to inject it in the action method.

Before:

namespace Acme\FooBundle\Controller;

class DemoController
{
    public function showAction()
    {
        $request = $this->getRequest();
        // ...
    }
}

After:

namespace Acme\FooBundle\Controller;

use Symfony\Component\HttpFoundation\Request;

class DemoController
{
    public function showAction(Request $request)
    {
        // ...
    }
}

The request service was removed. You must inject the request_stack service instead.

The templating.helper.assets was removed in Symfony 3.0. You should use the assets.package service instead.

Before:

use Symfony\Component\Templating\Helper\CoreAssetsHelper;

class DemoService
{
    private $assetsHelper;

    public function __construct(CoreAssetsHelper $assetsHelper)
    {
        $this->assetsHelper = $assetsHelper;
    }

    public function testMethod()
    {
        return $this->assetsHelper->getUrl('thumbnail.png', null, $this->assetsHelper->getVersion());
    }
}

After:

use Symfony\Component\Asset\Packages;

class DemoService
{
    private $assetPackages;

    public function __construct(Packages $assetPackages)
    {
        $this->assetPackages = $assetPackages;
    }

    public function testMethod()
    {
        return $this->assetPackages->getUrl('thumbnail.png').$this->assetPackages->getVersion();
    }
}

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) ?>

The RouterApacheDumperCommand was removed.
The createEsi method of Symfony\Bundle\FrameworkBundle\HttpCache\HttpCache was removed. Use createSurrogate instead.
The templating.helper.router service was moved to templating_php.xml. You have to ensure that the PHP templating engine is enabled to be able to use it:
```
framework:
    templating:
        engines: ['php']
```
The form.csrf_provider service is removed as it implements an adapter for the new token manager to the deprecated Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface interface. The security.csrf.token_manager should be used instead.

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:

Old name New name

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:

Old name	New name
`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.
The Symfony\Component\HttpKernel\DependencyInjection\RegisterListenersPass has been renamed to Symfony\Component\EventDispatcher\DependencyInjection\RegisterListenersPass and moved to the EventDispatcher component.

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:

Old way	New way
`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');

The ApacheMatcherDumper and ApacheUrlMatcher were removed since the performance gains were minimal and it's hard to replicate the behaviour of PHP implementation.

Security

The Resources/ directory was moved to Core/Resources/

The key settings of anonymous and remember_me are renamed to secret.

Before:

security:
    # ...
    firewalls:
        default:
            # ...
            anonymous: { key: "%secret%" }
            remember_me:
                key: "%secret%"

<!-- ... -->
<config>
    <!-- ... -->

    <firewall>
        <!-- ... -->

        <anonymous key="%secret%"/>
        <remember-me key="%secret%"/>
    </firewall>
</config>

// ...
$container->loadFromExtension('security', array(
    // ...
    'firewalls' => array(
        // ...
        'anonymous' => array('key' => '%secret%'),
        'remember_me' => array('key' => '%secret%'),
    ),
));

After:

security:
    # ...
    firewalls:
        default:
            # ...
            anonymous: { secret: "%secret%" }
            remember_me:
                secret: "%secret%"

<!-- ... -->
<config>
    <!-- ... -->

    <firewall>
        <!-- ... -->

        <anonymous secret="%secret%"/>
        <remember-me secret="%secret%"/>
    </firewall>
</config>

// ...
$container->loadFromExtension('security', array(
    // ...
    'firewalls' => array(
        // ...
        'anonymous' => array('secret' => '%secret%'),
        'remember_me' => array('secret' => '%secret%'),
    ),
));


### Translator

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

* The visibility of the `locale` property has been changed from protected to private. Rely on `getLocale` and `setLocale`
 instead.

 Before:

 ```php
  class CustomTranslator extends Translator
  {
      public function fooMethod()
      {
         // get locale
         $locale = $this->locale;

         // update locale
         $this->locale = $locale;
      }
  }

After:

 class CustomTranslator extends Translator
 {
     public function fooMethod()
     {
        // get locale
        $locale = $this->getLocale();

        // update locale
        $this->setLocale($locale);
    }
 }

Twig Bridge

The twig:lint command has been deprecated since Symfony 2.7 and will be removed in Symfony 3.0. Use the lint:twig command instead.
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) }}

TwigBundle

The twig:debug command has been deprecated since Symfony 2.7 and will be removed in Symfony 3.0. Use the debug:twig command instead.

Validator

The class Symfony\Component\Validator\Mapping\Cache\ApcCache has been removed in favor of Symfony\Component\Validator\Mapping\Cache\DoctrineCache.

Before:

use Symfony\Component\Validator\Mapping\Cache\ApcCache;

$cache = new ApcCache('symfony.validator');

After:

use Symfony\Component\Validator\Mapping\Cache\DoctrineCache;
use Doctrine\Common\Cache\ApcCache;

$apcCache = new ApcCache();
$apcCache->setNamespace('symfony.validator');

$cache = new DoctrineCache($apcCache);

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;

The option "methods" of the Callback constraint was removed. You should use the option "callback" instead. If you have multiple callbacks, add multiple callback constraints instead.

Before (YAML):

constraints:
  - Callback: [firstCallback, secondCallback]

After (YAML):

constraints:
  - Callback: firstCallback
  - Callback: secondCallback

When using annotations, you can now put the Callback constraint directly on the method that should be executed.

Before (Annotations):

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\ExecutionContextInterface;

/**
 * @Assert\Callback({"callback"})
 */
class MyClass
{
    public function callback(ExecutionContextInterface $context)
    {
        // ...
    }
}

After (Annotations):

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\ExecutionContextInterface;

class MyClass
{
    /**
     * @Assert\Callback
     */
    public function callback(ExecutionContextInterface $context)
    {
        // ...
    }
}

The interface ValidatorInterface was replaced by the more powerful interface Validator\ValidatorInterface. The signature of the validate() method is slightly different in that interface and accepts a value, zero or more constraints and validation group. It replaces both validate() and validateValue() in the previous interface.

Before:
```
$validator->validate($object, 'Strict');

$validator->validateValue($value, new NotNull());
```
After:
```
$validator->validate($object, null, 'Strict');

$validator->validate($value, new NotNull());
```
Apart from this change, the new methods startContext() and inContext() were added. The first of them allows to run multiple validations in the same context and aggregate their violations:
```
$violations = $validator->startContext()
    ->atPath('firstName')->validate($firstName, new NotNull())
    ->atPath('age')->validate($age, new Type('integer'))
    ->getViolations();
```
The second allows to run validation in an existing context. This is especially useful when calling the validator from within constraint validators:
```
$validator->inContext($context)->validate($object);
```
Instead of a Validator, the validator builder now returns a Validator\RecursiveValidator instead.
The interface ValidationVisitorInterface and its implementation ValidationVisitor were removed. The implementation of the visitor pattern was flawed. Fixing that implementation would have drastically slowed down the validator execution, so the visitor was removed completely instead.

Along with the visitor, the method accept() was removed from MetadataInterface.
The interface MetadataInterface was moved to the Mapping namespace.

Before:
```
use Symfony\Component\Validator\MetadataInterface;
```
After:
```
use Symfony\Component\Validator\Mapping\MetadataInterface;
```
The methods getCascadingStrategy() and getTraversalStrategy() were added to the interface. The first method should return a bit mask of the constants in class CascadingStrategy. The second should return a bit mask of the constants in TraversalStrategy.

Example:
```
use Symfony\Component\Validator\Mapping\TraversalStrategy;

public function getTraversalStrategy()
{
    return TraversalStrategy::TRAVERSE;
}
```

The interface PropertyMetadataInterface was moved to the Mapping namespace.

Before:

use Symfony\Component\Validator\PropertyMetadataInterface;

After:

use Symfony\Component\Validator\Mapping\PropertyMetadataInterface;

The interface PropertyMetadataContainerInterface was moved to the Mapping namespace and renamed to ClassMetadataInterface.

Before:
```
use Symfony\Component\Validator\PropertyMetadataContainerInterface;
```
After:
```
use Symfony\Component\Validator\Mapping\ClassMetadataInterface;
```
The interface now contains four additional methods:
- getConstrainedProperties()
- hasGroupSequence()
- getGroupSequence()
- isGroupSequenceProvider()
See the inline documentation of these methods for more information.

The interface ClassBasedInterface was removed. You should use Mapping\ClassMetadataInterface instead:

Before:

use Symfony\Component\Validator\ClassBasedInterface;

class MyClassMetadata implements ClassBasedInterface
{
    // ...
}

After:

use Symfony\Component\Validator\Mapping\ClassMetadataInterface;

class MyClassMetadata implements ClassMetadataInterface
{
    // ...
}

The class ElementMetadata was renamed to GenericMetadata.

Before:

use Symfony\Component\Validator\Mapping\ElementMetadata;

class MyMetadata extends ElementMetadata
{
}

After:

use Symfony\Component\Validator\Mapping\GenericMetadata;

class MyMetadata extends GenericMetadata
{
}

The interface ExecutionContextInterface and its implementation ExecutionContext were moved to the Context namespace.

Before:
```
use Symfony\Component\Validator\ExecutionContextInterface;
```
After:
```
use Symfony\Component\Validator\Context\ExecutionContextInterface;
```
The interface now contains the following additional methods:
- getValidator()
- getObject()
- setNode()
- setGroup()
- markGroupAsValidated()
- isGroupValidated()
- markConstraintAsValidated()
- isConstraintValidated()
See the inline documentation of these methods for more information.

The method addViolationAt() was removed. You should use buildViolation() instead.

Before:
```
$context->addViolationAt('property', 'The value {{ value }} is invalid.', array(
    '{{ value }}' => $invalidValue,
));
```
After:
```
$context->buildViolation('The value {{ value }} is invalid.')
    ->atPath('property')
    ->setParameter('{{ value }}', $invalidValue)
    ->addViolation();
```
The methods validate() and validateValue() were removed. You should use getValidator() together with inContext() instead.

Before:
```
$context->validate($object);
```
After:
```
$context->getValidator()
    ->inContext($context)
    ->validate($object);
```
The parameters $invalidValue, $plural and $code were removed from addViolation(). You should use buildViolation() instead. See above for an example.

The method getMetadataFactory() was removed. You can use getValidator() instead and use the methods getMetadataFor() or hasMetadataFor() on the validator instance.

Before:
```
$metadata = $context->getMetadataFactory()->getMetadataFor($myClass);
```
After:
```
$metadata = $context->getValidator()->getMetadataFor($myClass);
```
The interface GlobalExecutionContextInterface was removed. Most of the information provided by that interface can be queried from Context\ExecutionContextInterface instead.
The interface MetadataFactoryInterface was moved to the Mapping\Factory namespace along with its implementations BlackholeMetadataFactory and ClassMetadataFactory. These classes were furthermore renamed to BlackHoleMetadataFactory and LazyLoadingMetadataFactory.

Before:
```
use Symfony\Component\Validator\Mapping\ClassMetadataFactory;

$factory = new ClassMetadataFactory($loader);
```
After:
```
use Symfony\Component\Validator\Mapping\Factory\LazyLoadingMetadataFactory;

$factory = new LazyLoadingMetadataFactory($loader);
```
The option $deep was removed from the constraint Valid. When traversing arrays, nested arrays are always traversed (same behavior as before). When traversing nested objects, their traversal strategy is used.
The method ValidatorBuilder::setPropertyAccessor() was removed. The validator now functions without a property accessor.

The methods getMessageParameters() and getMessagePluralization() in ConstraintViolation were renamed to getParameters() and getPlural().

Before:

$parameters = $violation->getMessageParameters();
$plural = $violation->getMessagePluralization();

After:

$parameters = $violation->getParameters();
$plural = $violation->getPlural();

The class Symfony\Component\Validator\DefaultTranslator was removed. You should use Symfony\Component\Translation\IdentityTranslator instead.

Before:

$translator = new \Symfony\Component\Validator\DefaultTranslator();

After:

$translator = new \Symfony\Component\Translation\IdentityTranslator();
$translator->setLocale('en');

Yaml

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

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

Process

Process::setStdin() and Process::getStdin() have been removed. Use Process::setInput() and Process::getInput() that works the same way.
Process::setInput() and ProcessBuilder::setInput() do not accept non-scalar types.

Monolog Bridge

Symfony\Bridge\Monolog\Logger::emerg() was removed. Use emergency() which is PSR-3 compatible.
Symfony\Bridge\Monolog\Logger::crit() was removed. Use critical() which is PSR-3 compatible.
Symfony\Bridge\Monolog\Logger::err() was removed. Use error() which is PSR-3 compatible.
Symfony\Bridge\Monolog\Logger::warn() was removed. Use warning() which is PSR-3 compatible.

Swiftmailer Bridge

Symfony\Bridge\Swiftmailer\DataCollector\MessageDataCollector was removed. Use the Symfony\Bundle\SwiftmailerBundle\DataCollector\MessageDataCollector class instead.

HttpFoundation

Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface no longer implements the IteratorAggregate interface. Use the all() method instead of iterating over the flash bag.

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UPGRADE-3.0.md

UPGRADE-3.0.md

UPGRADE FROM 2.x to 3.0

ClassLoader

Console

DependencyInjection

EventDispatcher

Form

FrameworkBundle

HttpKernel

Locale

PropertyAccess

Routing

Security

Twig Bridge

TwigBundle

Validator

Yaml

Process

Monolog Bridge

Swiftmailer Bridge

HttpFoundation

Old name	New name
`emerg()`	`emergency()`
`crit()`	`critical()`
`err()`	`error()`
`warn()`	`warning()`

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UPGRADE-3.0.md

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UPGRADE-3.0.md

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UPGRADE FROM 2.x to 3.0

ClassLoader

Console

DependencyInjection

EventDispatcher

Form

FrameworkBundle

HttpKernel

Locale

PropertyAccess

Routing

Security

Twig Bridge

TwigBundle

Validator

Yaml

Process

Monolog Bridge

Swiftmailer Bridge

HttpFoundation