removeListener(string $eventName, callable $listener) Removes an event listener from the specified

class ImmutableEventDispatcher implements

addListener(string $eventName, callable $listener, int $priority) Adds an event listener that listens

removeListener(string $eventName, callable $listener) Removes an event listener from the specified

int|null getListenerPriority(string $eventName, callable $listener) Gets the listener priority

interface EventSubscriberInterface An EventSubscriber knows himself what events he is interested

bool offsetExists(string $key) ArrayAccess has argument.

array getListeners(string $eventName = null) Gets the listeners of a specific event or all listeners

class EventDispatcher implements

removeListener(string $eventName, callable $listener) Removes an event listener from the specified