Online PHP editor | output for hCrdo

<?php class E{function r($e, $l){$this->e[$e][] = $l} function d($e){foreach ($this->e[$e] as $l){$l->o();}}} class Listener { function o() { echo 'hello'; } } $listener = new Listener(); $eventDispatcher = new E(); $eventDispatcher->r('event1', $listener); $eventDispatcher->r('event1', $listener); $eventDispatcher->r('event2', $listener); $eventDispatcher->d('event1');