composer.json

{
	"require": {
		"symfony/event-dispatcher": "2.1.0-stable"
	}
}

symfony_event_dispatcher.php

<?php

require_once 'vendor/autoload.php'; 

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\Event;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class CallbackAggregateSubscriber implements EventSubscriberInterface {

	public static function getSubscribedEvents(){

		return array(
			'setup' => 'onSetup',
			'teardown' => 'onTearDown',
		);

	}

	public function onSetUp(Event $event){
		echo 'CallbackAggregateSubscriber:' . $event->getName() . "\n";
	}

	public function onTearDown(Event $event){
		echo 'CallbackAggregateSubscriber:' . $event->getName() . "\n";
	}

}


$eventManager = new EventDispatcher();

//Subscriber
$eventManager->addSubscriber( new CallbackAggregateSubscriber() );

//Closure
$eventManager->addListener('setup', function(Event $event){

	echo $event->getName() . "\n";

});

//Notify event
$eventManager->dispatch('setup');
$eventManager->dispatch('teardown');