addSubscriber(EventSubscriberInterface $subscriber) Adds an event subscriber. The subscriber is asked for all the events he is interested in and added as a listener for these events. Parameters EventSubscriberInterface $subscriber The subscriber

interface EventDispatcherInterface The EventDispatcherInterface is the central point of Symfony's event listener system. Listeners are registered on the manager and events are dispatched through the manager. Methods Event dispatch(string $eventName, Event $event = null) Dispatches an event to all registered listeners. addListener(string $eventName, callable $listener, int $priority) Adds an event listener that listens on the specified events. addSubscriber(EventSubscriberInterf

addListener(string $eventName, callable $listener, int $priority) Adds an event listener that listens on the specified events. Parameters string $eventName The event to listen on callable $listener The listener int $priority The higher this value, the earlier an event listener will be triggered in the chain (defaults to 0)

class EventDispatcherDebugCommand extends ContainerAwareCommand A console command for retrieving information about event dispatcher. Methods __construct(string|null $name = null) Constructor. from Command ignoreValidationErrors() Ignores validation errors. from Command setApplication(Application $application = null) Sets the application instance for this command. from Command setHelperSet(HelperSet $helperSet) Sets the helper set. from Command HelperSet getHelperSet() Get

int|null getListenerPriority(string $eventName, callable $listener) Gets the listener priority for a specific event. Returns null if the event or the listener does not exist. Parameters string $eventName The name of the event callable $listener The listener Return Value int|null The event listener priority

bool hasListeners(string $eventName = null) Checks whether an event has any registered listeners. Parameters string $eventName The name of the event Return Value bool true if the specified event has any listeners, false otherwise

removeListener(string $eventName, callable $listener) Removes an event listener from the specified events. Parameters string $eventName The event to remove a listener from callable $listener The listener to remove

removeSubscriber(EventSubscriberInterface $subscriber) Removes an event subscriber. Parameters EventSubscriberInterface $subscriber The subscriber

array getListeners(string $eventName = null) Gets the listeners of a specific event or all listeners sorted by descending priority. Parameters string $eventName The name of the event Return Value array The event listeners for the specified event, or all event listeners by event name

Event dispatch(string $eventName, Event $event = null) Dispatches an event to all registered listeners. Parameters string $eventName The name of the event to dispatch. The name of the event is the name of the method that is invoked on listeners. Event $event The event to pass to the event handlers/listeners If not supplied, an empty Event instance is created. Return Value Event