feature #340 Added an example of the dump() function (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #340).

Discussion
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Added an example of the dump() function

This fixes #339.

Commits
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8a5a49d Added an example of the dump() function

Author: javiereguiluz

src/AppBundle/Controller/BlogController.php

@@ -56,6 +56,16 @@ public function indexAction($page)
      */
     public function postShowAction(Post $post)
     {
+        // Symfony provides a function called 'dump()' which is an improved version
+        // of the 'var_dump()' function. It's useful to quickly debug the contents
+        // of any variable, but it's not available in the 'prod' environment to
+        // prevent any leak of sensitive information.
+        // This function can be used both in PHP files and Twig templates. The only
+        // requirement is to have enabled the DebugBundle.
+        if ('dev' === $this->getParameter('kernel.environment')) {
+            dump($post, $this->get('security.token_storage')->getToken()->getUser(), new \DateTime());
+        }
+
         return $this->render('blog/post_show.html.twig', array('post' => $post));
     }