UPGRADE FROM 5.x to 6.0

Console

Command::setHidden() has a default value (true) for $hidden parameter

Dotenv

Removed argument $usePutenv from Dotenv's constructor, use Dotenv::usePutenv() instead.

EventDispatcher

Removed LegacyEventDispatcherProxy. Use the event dispatcher without the proxy.

Form

Added the getIsEmptyCallback() method to the FormConfigInterface.
Added the setIsEmptyCallback() method to the FormConfigBuilderInterface.
Added argument callable|null $filter to ChoiceListFactoryInterface::createListFromChoices() and createListFromLoader().

FrameworkBundle

MicroKernelTrait::configureRoutes() is now always called with a RoutingConfigurator
The "framework.router.utf8" configuration option defaults to true

HttpFoundation

Removed Response::create(), JsonResponse::create(), RedirectResponse::create(), and StreamedResponse::create() methods (use __construct() instead)

Messenger

Removed AmqpExt transport. Run composer require symfony/amqp-messenger to keep the transport in your application.
Removed Doctrine transport. Run composer require symfony/doctrine-messenger to keep the transport in your application.
Removed RedisExt transport. Run composer require symfony/redis-messenger to keep the transport in your application.
Use of invalid options in Redis and AMQP connections now throws an error.

PhpUnitBridge

Removed support for @expectedDeprecation annotations, use the ExpectDeprecationTrait::expectDeprecation() method instead.

Routing

Removed RouteCollectionBuilder.
Added argument $priority to RouteCollection::add()
Removed the RouteCompiler::REGEX_DELIMITER constant

Security

Removed ROLE_PREVIOUS_ADMIN role in favor of IS_IMPERSONATOR attribute
Removed LogoutSuccessHandlerInterface and LogoutHandlerInterface, register a listener on the LogoutEvent event instead.
Removed DefaultLogoutSuccessHandler in favor of DefaultLogoutListener.