UPGRADE FROM 2.x to 3.0

\Symfony\Component\Config\Resource\ResourceInterface::isFresh() has been removed. Also, cache validation through this method (which was still supported in 2.8 for BC) does no longer work because the \Symfony\Component\Config\Resource\BCResourceInterfaceChecker helper class has been removed as well.
The __toString() method of the \Symfony\Component\Config\ConfigCache class was removed in favor of the new getPath() method.

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 concept of scopes was removed, the removed methods are:
- Symfony\Component\DependencyInjection\ContainerBuilder::getScopes()
- Symfony\Component\DependencyInjection\ContainerBuilder::getScopeChildren()
- Symfony\Component\DependencyInjection\ContainerInterface::enterScope()
- Symfony\Component\DependencyInjection\ContainerInterface::leaveScope()
- Symfony\Component\DependencyInjection\ContainerInterface::addScope()
- Symfony\Component\DependencyInjection\ContainerInterface::hasScope()
- Symfony\Component\DependencyInjection\ContainerInterface::isScopeActive()
- Symfony\Component\DependencyInjection\Definition::setScope()
- Symfony\Component\DependencyInjection\Definition::getScope()
- Symfony\Component\DependencyInjection\Reference::isStrict()

Also, the $scope and $strict parameters of Symfony\Component\DependencyInjection\ContainerInterface::set() and Symfony\Component\DependencyInjection\Reference respectively were removed.

A new shared flag has been added to the service definition in replacement of the prototype scope.

Before:

use Symfony\Component\DependencyInjection\ContainerBuilder;

$container = new ContainerBuilder();
$container
    ->register('foo', 'stdClass')
    ->setScope(ContainerBuilder::SCOPE_PROTOTYPE)
;

services:
    foo:
        class: stdClass
        scope: prototype

<services>
    <service id="foo" class="stdClass" scope="prototype" />
</services>

After:

use Symfony\Component\DependencyInjection\ContainerBuilder;

$container = new ContainerBuilder();
$container
    ->register('foo', 'stdClass')
    ->setShared(false)
;

services:
    foo:
        class: stdClass
        shared: false

<services>
    <service id="foo" class="stdClass" shared="false" />
</services>

Symfony\Component\DependencyInjection\ContainerAware was removed, use Symfony\Component\DependencyInjection\ContainerAwareTrait or implement Symfony\Component\DependencyInjection\ContainerAwareInterface manually
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().

DomCrawler

The interface of the Symfony\Component\DomCrawler\Crawler changed. It does no longer implement \Iterator but \IteratorAggregate. If you rely on methods of the \Iterator interface, call the getIterator method of the \IteratorAggregate interface before. No changes are required in a \Traversable-aware control structure, such as foreach.

Before:
```
$crawler->current();
```
After:
```
$crawler->getIterator()->current();
```

DoctrineBridge

The property option of DoctrineType was removed in favor of the choice_label option.
The loader option of DoctrineType was removed. You now have to override the getLoader() method in your custom type.
The Symfony\Bridge\Doctrine\Form\ChoiceList\EntityChoiceList was removed in favor of Symfony\Bridge\Doctrine\Form\ChoiceList\DoctrineChoiceLoader.
Passing a query builder closure to ORMQueryBuilderLoader is not supported anymore. You should pass resolved query builders only.

Consequently, the arguments $manager and $class of ORMQueryBuilderLoader have been removed as well.

Note that the query_builder option of DoctrineType does support closures, but the closure is now resolved in the type instead of in the loader.
Using the entity provider with a Doctrine repository implementing UserProviderInterface is not supported anymore. You should make the repository implement UserLoaderInterface instead.

EventDispatcher

The method getListenerPriority($eventName, $listener) has been added to the EventDispatcherInterface.
The interface Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcherInterface extends Symfony\Component\EventDispatcher\EventDispatcherInterface.

Form

The getBlockPrefix() method was added to the FormTypeInterface in replacement of the getName() method which has been removed.
The configureOptions() method was added to the FormTypeInterface in replacement of the setDefaultOptions() method which has been removed.
The getBlockPrefix() method was added to the ResolvedFormTypeInterface in replacement of the getName() method which has been removed.
The option options of the CollectionType has been removed in favor of the entry_options option.
The cascade_validation option was removed. Use the constraints option together with the Valid constraint instead.

Type names were removed. Instead of referencing types by name, you must reference them by their fully-qualified class name (FQCN) instead:

Before:

$form = $this->createFormBuilder()
    ->add('name', 'text')
    ->add('age', 'integer')
    ->getForm();

After:

use Symfony\Component\Form\Extension\Core\Type\IntegerType;
use Symfony\Component\Form\Extension\Core\Type\TextType;

$form = $this->createFormBuilder()
    ->add('name', TextType::class)
    ->add('age', IntegerType::class)
    ->getForm();

If you want to customize the block prefix of a type in Twig, you must now implement FormTypeInterface::getBlockPrefix():

Before:

class UserProfileType extends AbstractType
{
    public function getName()
    {
        return 'profile';
    }
}

After:

class UserProfileType extends AbstractType
{
    public function getBlockPrefix()
    {
        return 'profile';
    }
}

If you don't customize getBlockPrefix(), it defaults to the class name without "Type" suffix in underscore notation (here: "user_profile").

Type extension must return the fully-qualified class name of the extended type from FormTypeExtensionInterface::getExtendedType() now.

Before:

class MyTypeExtension extends AbstractTypeExtension
{
    public function getExtendedType()
    {
        return 'form';
    }
}

After:

use Symfony\Component\Form\Extension\Core\Type\FormType;

class MyTypeExtension extends AbstractTypeExtension
{
    public function getExtendedType()
    {
        return FormType::class;
    }
}

The FormTypeInterface::getName() method was removed.

Returning type instances from FormTypeInterface::getParent() is not supported anymore. Return the fully-qualified class name of the parent type class instead.

Before:

class MyType
{
    public function getParent()
    {
        return new ParentType();
    }
}

After:

class MyType
{
    public function getParent()
    {
        return ParentType::class;
    }
}

The option type of the CollectionType has been removed in favor of the entry_type option. The value for the entry_type option must be the fully-qualified class name (FQCN).
Passing type instances to Form::add(), FormBuilder::add() and the FormFactory::create*() methods is not supported anymore. Pass the fully-qualified class name of the type instead.

Before:
```
$form = $this->createForm(new MyType());
```
After:
```
$form = $this->createForm(MyType::class);
```

Passing custom data to forms now needs to be done through the options resolver.

In the controller:

Before:

$form = $this->createForm(new MyType($variable), $entity, array(
    'action' => $this->generateUrl('action_route'),
    'method' => 'PUT',
));

After:

$form = $this->createForm(MyType::class, $entity, array(
    'action' => $this->generateUrl('action_route'),
    'method' => 'PUT',
    'custom_value' => $variable,
));

In the form type:

Before:

class MyType extends AbstractType
{
    private $value;

    public function __construct($variableValue)
    {
        $this->value = $value;
    }
    // ...
}

After:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $value = $options['custom_value'];
    // ...
}

public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults(array(
        'custom_value' => null,
    ));
}

The alias option of the form.type_extension tag was removed in favor of the extended_type/extended-type option.

Before:

<service id="app.type_extension" class="Vendor\Form\Extension\MyTypeExtension">
    <tag name="form.type_extension" alias="text" />
</service>

After:

<service id="app.type_extension" class="Vendor\Form\Extension\MyTypeExtension">
    <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\TextType" />
</service>

The max_length option was removed. Use the attr option instead by setting it to an array with a maxlength key.
The ChoiceToBooleanArrayTransformer, ChoicesToBooleanArrayTransformer, FixRadioInputListener, and FixCheckboxInputListener classes were removed.
The choice_list option of ChoiceType was removed.

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

Before:

use Symfony\Component\Form\Extension\Core\Type\NumberType;

$builder->add('length', NumberType::class, array(
   'precision' => 3,
));

After:

use Symfony\Component\Form\Extension\Core\Type\NumberType;

$builder->add('length', NumberType::class, array(
   'scale' => 3,
));

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

Before:

use Symfony\Component\Form\Extension\Core\Type\FormType;

$builder->add('address', FormType::class, array(
    'virtual' => true,
));

After:

use Symfony\Component\Form\Extension\Core\Type\FormType;

$builder->add('address', FormType::class, array(
    'inherit_data' => true,
));

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 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 option "options" of the CollectionType has been renamed to "entry_options".
The option "type" of the CollectionType has been renamed to "entry_type". As a value for the option you must provide the fully-qualified class name (FQCN) now as well.
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 Symfony\Component\Form\Extension\Core\ChoiceList\ChoiceListInterface was removed in favor of Symfony\Component\Form\ChoiceList\ChoiceListInterface.
Symfony\Component\Form\Extension\Core\View\ChoiceView was removed in favor of Symfony\Component\Form\ChoiceList\View\ChoiceView.
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.
The TimezoneType::getTimezones() method was removed. You should not use this method.
The Symfony\Component\Form\ChoiceList\ArrayKeyChoiceList 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 base Controllerclass is now abstract.
The visibility of all methods of the base Controller class has been changed from public to protected.

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)
    {
        // ...
    }
}

In Symfony 2.7 a small BC break was introduced with the new choices_as_values option. In order to have the choice values populated to the html value attribute you had to define the choice_value option. This is now not any more needed.

Before:

$form->add('status', 'choice', array(
    'choices' => array(
        'Enabled' => Status::ENABLED,
        'Disabled' => Status::DISABLED,
        'Ignored' => Status::IGNORED,
    ),
    // choices_as_values defaults to true in Symfony 3.0
    // and setting it to anything else is deprecated as of 3.0
    'choices_as_values' => true,
    // important if you rely on your option value attribute (e.g. for JavaScript)
    // this will keep the same functionality as before
    'choice_value' => function ($choice) {
        return $choice;
    },
));

After:

$form->add('status', ChoiceType::class, array(
    'choices' => array(
        'Enabled' => Status::ENABLED,
        'Disabled' => Status::DISABLED,
        'Ignored' => Status::IGNORED,
    )
));

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

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.
The validator.mapping.cache.apc service has been removed in favor of the validator.mapping.cache.doctrine.apc one.
The ability to pass apc as the framework.validation.cache configuration key value has been removed. Use validator.mapping.cache.doctrine.apc instead:

Before:
```
framework:
    validation:
        cache: apc
```
After:
```
framework:
    validation:
        cache: validator.mapping.cache.doctrine.apc
```

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 has been removed 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.
The getMatcherDumperInstance() and getGeneratorDumperInstance() methods in the Symfony\Component\Routing\Router have been changed from public to protected.

Use the constants defined in the UrlGeneratorInterface for the $referenceType argument of the UrlGeneratorInterface::generate method.

Before:

// url generated in controller
$this->generateUrl('blog_show', array('slug' => 'my-blog-post'), true);

// url generated in @router service
$router->generate('blog_show', array('slug' => 'my-blog-post'), true);

After:

use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

// url generated in controller
$this->generateUrl('blog_show', array('slug' => 'my-blog-post'), UrlGeneratorInterface::ABSOLUTE_URL);

// url generated in @router service
$router->generate('blog_show', array('slug' => 'my-blog-post'), UrlGeneratorInterface::ABSOLUTE_URL);

Security

The vote() method from the VoterInterface was changed to now accept arbitrary types and not only objects. You can rely on the new abstract Voter class introduced in 2.8 to ease integrating your own voters.
The AbstractVoter class was removed in favor of the new Voter class.
The Resources/ directory was moved to Core/Resources/

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

Before:

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

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

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

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

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

After:

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

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

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

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

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

The AbstractVoter class was removed. Instead, extend the new Voter class, introduced in 2.8, and move your voting logic to the to the supports($attribute, $subject) and voteOnAttribute($attribute, $object, TokenInterface $token) methods.
The vote() method from the VoterInterface was changed to now accept arbitrary types, and not only objects.

The supportsClass and supportsAttribute methods were removed from the VoterInterface interface.

Before:

class MyVoter extends AbstractVoter
{
    protected function getSupportedAttributes()
    {
        return array('CREATE', 'EDIT');
    }

    protected function getSupportedClasses()
    {
        return array('AppBundle\Entity\Post');
    }

    // ...
}

After:

use Symfony\Component\Security\Core\Authorization\Voter\Voter;

class MyVoter extends Voter
{
    protected function supports($attribute, $object)
    {
        return $object instanceof Post && in_array($attribute, array('CREATE', 'EDIT'));
    }

    protected function voteOnAttribute($attribute, $object, TokenInterface $token)
    {
        // Return true or false
    }
}

The AbstractVoter::isGranted() method has been replaced by Voter::voteOnAttribute().

Before:

class MyVoter extends AbstractVoter
{
    protected function isGranted($attribute, $object, $user = null)
    {
        return 'EDIT' === $attribute && $user === $object->getAuthor();
    }

    // ...
}

After:

class MyVoter extends Voter
{
    protected function voteOnAttribute($attribute, $object, TokenInterface $token)
    {
        return 'EDIT' === $attribute && $token->getUser() === $object->getAuthor();
    }

    // ...
}

The supportsAttribute() and supportsClass() methods of the AuthenticatedVoter, ExpressionVoter, and RoleVoter classes have been removed.
The intention option was renamed to csrf_token_id for all the authentication listeners.
The csrf_provider option was renamed to csrf_token_generator for all the authentication listeners.

SecurityBundle

The intention firewall listener setting was renamed to csrf_token_id.
The csrf_provider firewall listener setting was renamed to csrf_token_generator.

Serializer

The setCamelizedAttributes() method of the Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer and Symfony\Component\Serializer\Normalizer\PropertyNormalizer classes was removed.
The Symfony\Component\Serializer\Exception\Exception interface was removed in favor of the new Symfony\Component\Serializer\Exception\ExceptionInterface.

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:

 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);
    }
 }

The method FileDumper::format() was removed. You should use FileDumper::formatCatalogue() instead.

Before:

 class CustomDumper extends FileDumper
 {
     protected function format(MessageCatalogue $messages, $domain)
     {
         ...
     }
 }

After:

 class CustomDumper extends FileDumper
 {
     public function formatCatalogue(MessageCatalogue $messages, $domain, array $options = array())
     {
         ...
     }
 }

The getMessages() method of the Symfony\Component\Translation\Translator class was removed. You should use the getCatalogue() method of the Symfony\Component\Translation\TranslatorBagInterface.

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 Symfony\Bundle\TwigBundle\TwigDefaultEscapingStrategy was removed in favor of Twig_FileExtensionEscapingStrategy.
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 PHP7-incompatible constraints (Null, True, False) and their related validators (NullValidator, TrueValidator, FalseValidator) have been removed in favor of their Is-prefixed equivalent.

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

Using a colon in an unquoted mapping value leads to a ParseException.
Starting an unquoted string with @, `, |, or > leads to a ParseException.
When surrounding strings with double-quotes, you must now escape \ characters. Not escaping those characters (when surrounded by double-quotes) leads to a ParseException.

Before:
```
class: "Foo\Var"
```
After:
```
class: "Foo\\Var"
```
The ability to pass file names to Yaml::parse() has been removed.

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

WebProfiler

The profiler:import and profiler:export commands have been removed.
All the profiler storages different than FileProfilerStorage have been removed. The removed classes are:
- Symfony\Component\HttpKernel\Profiler\BaseMemcacheProfilerStorage
- Symfony\Component\HttpKernel\Profiler\MemcachedProfilerStorage
- Symfony\Component\HttpKernel\Profiler\MemcacheProfilerStorage
- Symfony\Component\HttpKernel\Profiler\MongoDbProfilerStorage
- Symfony\Component\HttpKernel\Profiler\MysqlProfilerStorage
- Symfony\Component\HttpKernel\Profiler\PdoProfilerStorage
- Symfony\Component\HttpKernel\Profiler\RedisProfilerStorage
- Symfony\Component\HttpKernel\Profiler\SqliteProfilerStorage

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

The precedence of parameters returned from Request::get() changed from "GET, PATH, BODY" to "PATH, GET, BODY"
Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface no longer implements the IteratorAggregate interface. Use the all() method instead of iterating over the flash bag.
Removed the feature that allowed finding deep items in ParameterBag::get(). This may affect you when getting parameters from the Request class:

Before:
```
$request->query->get('foo[bar]', null, true);
```
After:
```
$request->query->get('foo')['bar'];
```

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.

Old name	New name
`registerNamespaces()`	`addPrefixes()`
`registerPrefixes()`	`addPrefixes()`
`registerNamespace()`	`addPrefix()`
`registerPrefix()`	`addPrefix()`
`getNamespaces()`	`getPrefixes()`
`getNamespaceFallbacks()`	`getFallbackDirs()`
`getPrefixFallbacks()`	`getFallbackDirs()`

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UPGRADE-3.0.md

UPGRADE-3.0.md

UPGRADE FROM 2.x to 3.0

Table of Contents

ClassLoader

Config

Console

DependencyInjection

DomCrawler

DoctrineBridge

EventDispatcher

Form

FrameworkBundle

HttpKernel

Locale

PropertyAccess

Routing

Security

SecurityBundle

Serializer

Translator

Twig Bridge

TwigBundle

Validator

Yaml

WebProfiler

Process

Monolog Bridge

Swiftmailer Bridge

HttpFoundation

Monolog Bridge

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

Files

UPGRADE-3.0.md

Latest commit

History

UPGRADE-3.0.md

File metadata and controls

UPGRADE FROM 2.x to 3.0

Table of Contents

ClassLoader

Config

Console

DependencyInjection

DomCrawler

DoctrineBridge

EventDispatcher

Form

FrameworkBundle

HttpKernel

Locale

PropertyAccess

Routing

Security

SecurityBundle

Serializer

Translator

Twig Bridge

TwigBundle

Validator

Yaml

WebProfiler

Process

Monolog Bridge

Swiftmailer Bridge

HttpFoundation

Monolog Bridge