UPGRADE FROM 3.3 to 3.4

DependencyInjection

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.

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.

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

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

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.

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