Symfony2 : get current directory error - php

Question

When I try to get the current directory with :
$this->container->getParameter('kernel.root_dir').'/../web/
I've got this error : Fatal error: Using $this when not in object context in C:\XXX on line 124
Code :
class AdminController {
/**
* Add event controller.
*
* #param Request $request Incoming request
* #param Application $app Silex application
*/
public function addEventAction(Request $request, Application $app) {
$event = new Event();
$types= $app['dao.type']->findAllSelectList();
$eventForm = $app['form.factory']->create(new EventType($types), $event);
$eventForm->handleRequest($request);
if ($eventForm->isSubmitted() && $eventForm->isValid()) {
var_dump($event->getCoverImageLink());
$file = $event->getCoverImageLink();
$fileName = md5(uniqid()).'.'.$file->guessExtension();
var_dump($fileName);
//$path = $this->container->getParameter('kernel.root_dir').'/../web';//$this->get('kernel')->getRootDir() . '/../web';
var_dump($this);
$app['dao.event']->save($event);
$app['session']->getFlashBag()->add('success', 'The event was successfully created.');
}
return $app['twig']->render('event_form.html.twig', array(
'title' => 'New event',
'eventForm' => $eventForm->createView()));
}
How to fix this error please? What is the correct function to use?

Answer 1

It appears that you are using Silex, not Symfony 2. Being a very minimalistic framework, silex doesn't give you all the configuration and dependency injection goodies that Symfony does.
The easiest approach to be able to retrieve the application root, would be to define it yourself in bootstrap.php. Simply add something like this at the top:
define('APP_ROOT', __DIR__ . '/../');
Now you can just use the constant in your controller:
public function addEventAction(Request $request, Application $app) {
...
$path = APP_ROOT . '/../web';
...
}