UPGRADE FROM 3.3 to 3.4

DependencyInjection

Relying on service auto-registration while autowiring is deprecated and won't be supported in Symfony 4.0. Explicitly inject your dependencies or create services whose ids are their fully-qualified class name.

Before:

namespace App\Controller;

use App\Mailer;

class DefaultController
{
    public function __construct(Mailer $mailer) {
        // ...
    }

    // ...
}

services:
    App\Controller\DefaultController:
        autowire: true

After:

// same PHP code

services:
    App\Controller\DefaultController:
        autowire: true

    # or
    # App\Controller\DefaultController:
    #     arguments: { $mailer: "@App\Mailer" }

    App\Mailer:
        autowire: true

Top-level anonymous services in XML are deprecated and will throw an exception in Symfony 4.0.

Debug

Support for stacked errors in the ErrorHandler is deprecated and will be removed in Symfony 4.0.

Filesystem

The Symfony\Component\Filesystem\LockHandler class has been deprecated, use the Symfony\Component\Lock\Store\FlockStore class or the Symfony\Component\Lock\Store\FlockStore\SemaphoreStore class directly instead.

Finder

The Symfony\Component\Finder\Iterator\FilterIterator class has been deprecated and will be removed in 4.0 as it used to fix a bug which existed before version 5.5.23/5.6.7.

FrameworkBundle

The doctrine/cache dependency has been removed; require it via composer require doctrine/cache if you are using Doctrine cache in your project.
The validator.mapping.cache.doctrine.apc service has been deprecated.
The symfony/stopwatch dependency has been removed, require it via composer require symfony/stopwatch in your dev environment.
Using the KERNEL_DIR environment variable or the automatic guessing based on the phpunit.xml / phpunit.xml.dist file location is deprecated since 3.4. Set the KERNEL_CLASS environment variable to the fully-qualified class name of your Kernel instead. Not setting the KERNEL_CLASS environment variable will throw an exception on 4.0 unless you override the KernelTestCase::createKernel() or KernelTestCase::getKernelClass() method.
The KernelTestCase::getPhpUnitXmlDir() and KernelTestCase::getPhpUnitCliConfigArgument() methods are deprecated since 3.4 and will be removed in 4.0.
The --no-prefix option of the translation:update command is deprecated and will be removed in 4.0. Use the --prefix option with an empty string as value instead (e.g. --prefix="")
The Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddCacheClearerPass class has been deprecated and will be removed in 4.0. Use the Symfony\Component\HttpKernel\DependencyInjection\AddCacheClearerPass class instead.
The Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddCacheWarmerPass class has been deprecated and will be removed in 4.0. Use the Symfony\Component\HttpKernel\DependencyInjection\AddCacheWarmerPass class instead.
The Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\TranslationDumperPass class has been deprecated and will be removed in 4.0. Use the Symfony\Component\Translation\DependencyInjection\TranslationDumperPass class instead.
The Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\TranslationExtractorPass class has been deprecated and will be removed in 4.0. Use the Symfony\Component\Translation\DependencyInjection\TranslationExtractorPass class instead.
The Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\TranslatorPass class has been deprecated and will be removed in 4.0. Use the Symfony\Component\Translation\DependencyInjection\TranslatorPass class instead.
The Symfony\Bundle\FrameworkBundle\Translation\TranslationLoader class has been deprecated and will be removed in 4.0. Use the Symfony\Component\Translation\Reader\TranslationReader class instead.
The translation.loader service has been deprecated and will be removed in 4.0. Use the translation.reader service instead.

HttpKernel

Relying on convention-based commands discovery has been deprecated and won't be supported in 4.0. Use PSR-4 based service discovery instead.

Before:

# app/config/services.yml
services:
    # ...

    # implicit registration of all commands in the `Command` folder

After:

# app/config/services.yml
services:
    # ...

    # explicit commands registration
    AppBundle\Command:
        resource: '../../src/AppBundle/Command/*'
        tags: ['console.command']

The getCacheDir() method of your kernel should not be called while building the container. Use the %kernel.cache_dir% parameter instead. Not doing so may break the cache:clear command.

Process

The Symfony\Component\Process\ProcessBuilder class has been deprecated, use the Symfony\Component\Process\Process class directly instead.

SecurityBundle

Using voters that do not implement the VoterInterfaceis now deprecated in the AccessDecisionManager and this functionality will be removed in 4.0.
FirewallContext::getListeners() now returns \Traversable|array

Translation

Symfony\Component\Translation\Writer\TranslationWriter::writeTranslations has been deprecated and will be removed in 4.0, use Symfony\Component\Translation\Writer\TranslationWriter::write instead.

TwigBridge

deprecated the Symfony\Bridge\Twig\Form\TwigRenderer class, use the FormRenderer class from the Form component instead
deprecated Symfony\Bridge\Twig\Command\DebugCommand::set/getTwigEnvironment and the ability to pass a command name as first argument
deprecated Symfony\Bridge\Twig\Command\LintCommand::set/getTwigEnvironment and the ability to pass a command name as first argument

TwigBundle

deprecated the Symfony\Bundle\TwigBundle\Command\DebugCommand class, use the DebugCommand class from the Twig bridge instead
deprecated relying on the ContainerAwareInterface implementation for Symfony\Bundle\TwigBundle\Command\LintCommand

Validator

Not setting the strict option of the Choice constraint to true is deprecated and will throw an exception in Symfony 4.0.

Yaml

using the !php/object: tag is deprecated and won't be supported in 4.0. Use the !php/object tag (without the colon) instead.
using the !php/const: tag is deprecated and won't be supported in 4.0. Use the !php/const tag (without the colon) instead.

Before:
```
!php/const:PHP_INT_MAX
```
After:
```
!php/const PHP_INT_MAX
```
Support for the !str tag is deprecated, use the !!str tag instead.
Using the non-specific tag ! is deprecated and will have a different behavior in 4.0. Use a plain integer or !!float instead.

Using the Yaml::PARSE_KEYS_AS_STRINGS flag is deprecated as it will be removed in 4.0.

Before:

$yaml = <<<YAML
null: null key
true: boolean true
2.0: float key
YAML;

Yaml::parse($yaml, Yaml::PARSE_KEYS_AS_STRINGS);

After:

$yaml = <<<YAML
"null": null key
"true": boolean true
"2.0": float key
YAML;

Yaml::parse($yaml);

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