UPGRADE FROM 3.2 to 3.3

ClassLoader

The component is deprecated and will be removed in 4.0. Use Composer instead.

Debug

The ContextErrorException class is deprecated. \ErrorException will be used instead in 4.0.

DependencyInjection

Autowiring-types have been deprecated, use aliases instead.

Before:

<service id="annotations.reader" class="Doctrine\Common\Annotations\AnnotationReader" public="false">
    <autowiring-type>Doctrine\Common\Annotations\Reader</autowiring-type>
</service>

After:

<service id="annotations.reader" class="Doctrine\Common\Annotations\AnnotationReader" public="false" />
<service id="Doctrine\Common\Annotations\Reader" alias="annotations.reader" public="false" />

The Reference and Alias classes do not make service identifiers lowercase anymore.
Case insensitivity of service identifiers is deprecated and will be removed in 4.0.
Using the PhpDumper with an uncompiled ContainerBuilder is deprecated and will not be supported anymore in 4.0.
The DefinitionDecorator class is deprecated and will be removed in 4.0, use the ChildDefinition class instead.

EventDispatcher

The ContainerAwareEventDispatcher class has been deprecated. Use EventDispatcher with closure-proxy injection instead.

Finder

The ExceptionInterface has been deprecated and will be removed in 4.0.

FrameworkBundle

The Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddConsoleCommandPass has been deprecated. Use Symfony\Component\Console\DependencyInjection\AddConsoleCommandPass instead.

HttpKernel

The Psr6CacheClearer::addPool() method has been deprecated. Pass an array of pools indexed by name to the constructor instead.

Process

The ProcessUtils::escapeArgument() method has been deprecated, use a command line array or give env vars to the Process::start/run() method instead.
Not inheriting environment variables is deprecated.
Configuring proc_open() options is deprecated.
Configuring Windows and sigchild compatibility is deprecated - they will be always enabled in 4.0.

Security

The RoleInterface has been deprecated. Extend the Symfony\Component\Security\Core\Role\Role class in your custom role implementations instead.

SecurityBundle

The FirewallContext::getContext() method has been deprecated and will be removed in 4.0. Use the getListeners() method instead.
The FirewallMap::$map and $container properties have been deprecated and will be removed in 4.0.

TwigBridge

The TwigRendererEngine::setEnvironment() method has been deprecated and will be removed in 4.0. Pass the Twig Environment as second argument of the constructor instead.

Workflow

Deprecated class name support in WorkflowRegistry::add() as second parameter. Wrap the class name in an instance of ClassInstanceSupportStrategy instead.

Yaml

The constructor arguments $offset, $totalNumberOfLines and $skippedLineNumbers of the Parser class are deprecated and will be removed in 4.0

Uh oh!