Fixed CSRF check in controller

Author: HeahDude

controller/csrf_token_validation.rst

@@ -9,9 +9,11 @@ want to use the Symfony Form component. If, for example, you are implementing
 a DELETE action, you can use the :method:`Symfony\\Bundle\\FrameworkBundle\\Controller\\Controller::isCsrfTokenValid`
 method to check the validity of a CSRF token::
 
-    public function deleteAction()
+    use Symfony\Component\HttpFoundation\Request;
+
+    public function deleteAction(Request $request)
     {
-        if ($this->isCsrfTokenValid('token_id', $submittedToken)) {
+        if ($this->isCsrfTokenValid('token_id', $request->request->get('token_param'))) {
             // ... do something, like deleting an object
         }
     }