Code illustration for M6Web article

listener_example.php

<?php
namespace M6\Bundle\MyBundle\Listener;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use M6\Bundle\MyBundle\Helper\MyHelper;

class MyEventSubscriber implements EventSubscriberInterface
{
    protected $helper = null;

    public function __construct(MyHelper $myHelper)
    {
        $this->helper = $myHelper;
    }

    static public function getSubscribedEvents()
    {
        $subscriber = array(
            KernelEvents::REQUEST => array(
                array('onKernelRequest', 0),
            )
        );

        return $subscriber;
    }

    public function onKernelRequest(GetResponseEvent $event)
    {
        $this->helper->doSomething($event->getRequest()->getPathInfo());

        return $this;
    }
}