Deprecated support for non-string default env() parameters

Before:

parameters:
    env(NAME): 1.5

After:

parameters:
       env(NAME): '1.5'

The signature of the EventDispatcherInterface::dispatch() method has been updated, consider using the new signature dispatch($event, string $eventName = null) instead of the old signature dispatch($eventName, $event) that is deprecated

You have to swap arguments when calling dispatch():

Before:

$this->eventDispatcher->dispatch(Events::My_EVENT, $event);

After:

$this->eventDispatcher->dispatch($event, Events::My_EVENT);

If your bundle or package needs to provide compatibility with the previous way of using the dispatcher, you can use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy::decorate() to ease upgrades:

Before:

public function __construct(EventDispatcherInterface $eventDispatcher) {
    $this->eventDispatcher = $eventDispatcher;
}

After:

public function __construct(EventDispatcherInterface $eventDispatcher) {
    $this->eventDispatcher = LegacyEventDispatcherProxy::decorate($eventDispatcher);
}

The Event class has been deprecated, use Symfony\Contracts\EventDispatcher\Event instead

The Role and SwitchUserRole classes are deprecated and will be removed in 5.0. Use strings for roles instead.

The getReachableRoles() method of the RoleHierarchyInterface is deprecated and will be removed in 5.0. Role hierarchies must implement the getReachableRoleNames() method instead and return roles as strings.

The getRoles() method of the TokenInterface is deprecated. Tokens must implement the getRoleNames() method instead and return roles as strings.

The ListenerInterface is deprecated, turn your listeners into callables instead.

The Firewall::handleRequest() method is deprecated, use Firewall::callListeners() instead.

The AbstractToken::serialize(), AbstractToken::unserialize(), AuthenticationException::serialize() and AuthenticationException::unserialize() methods are now final, use __serialize() and __unserialize() instead.

Before:

public function serialize()
{
    return [$this->myLocalVar, parent::serialize()];
}

public function unserialize($serialized)
{
    [$this->myLocalVar, $parentSerialized] = unserialize($serialized);
    parent::unserialize($parentSerialized);
}

After:

public function __serialize(): array
{
    return [$this->myLocalVar, parent::__serialize()];
}

public function __unserialize(array $data): void
{
    [$this->myLocalVar, $parentData] = $data;
    parent::__unserialize($parentData);
}

The Argon2iPasswordEncoder class has been deprecated, use SodiumPasswordEncoder instead.

The BCryptPasswordEncoder class has been deprecated, use NativePasswordEncoder instead.

Not implementing the methods __serialize and __unserialize in classes implementing the TokenInterface is deprecated

initial_place is deprecated in favour of initial_marking.

Before:

framework:
   workflows:
       article:
           initial_place: draft

After:

framework:
   workflows:
       article:
           initial_marking: [draft]

WorkflowInterface::apply() will have a third argument in Symfony 5.0.

Before:

class MyWorkflow implements WorkflowInterface
{
    public function apply($subject, $transitionName)
    {
    }
}

After:

class MyWorkflow implements WorkflowInterface
{
    public function apply($subject, $transitionName, array $context = [])
    {
    }
}

MarkingStoreInterface::setMarking() will have a third argument in Symfony 5.0.

Before:

class MyMarkingStore implements MarkingStoreInterface
{
    public function setMarking($subject, Marking $marking)
    {
    }
}

After:

class MyMarkingStore implements MarkingStoreInterface
{
    public function setMarking($subject, Marking $marking , array $context = [])
    {
    }
}

MultipleStateMarkingStore is deprecated. Use MethodMarkingStore instead.

Before:

framework:
    workflows:
        article:
            type: workflow
            marking_store:
                type: multiple_state
                arguments: states

After:

framework:
    workflows:
        article:
            type: workflow
            marking_store:
                type: method
                property: states

SingleStateMarkingStore is deprecated. Use MethodMarkingStore instead.

Before:

framework:
    workflows:
        article:
            marking_store:
                arguments: state

After:

framework:
    workflows:
        article:
            type: state_machine
            marking_store:
                type: method
                property: state

Using a workflow with a single state marking is deprecated. Use a state machine instead.

Before:

framework:
    workflows:
        article:
            type: workflow
            marking_store:
                type: single_state

After:

framework:
    workflows:
        article:
            type: state_machine
            marking_store:
                # type: single_state # Since the single_state marking store is deprecated, use method instead
                type: method

Using DefinitionBuilder::setInitialPlace() is deprecated, use DefinitionBuilder::setInitialPlaces() instead.