bool offsetExists(string $key) ArrayAccess has argument.

addSubscriberService(string $serviceId, string $class) Adds a service as event subscriber.

getContainer()

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

class EventDispatcher implements

class ImmutableEventDispatcher implements

interface EventSubscriberInterface An EventSubscriber knows himself what events he is interested

addListenerService(string $eventName, array $callback, int $priority) Adds a service as event listener

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

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