title: Symfony2 Mark menu as active layout.html.twig
body: <p>I created a small website with 4 pages, means 4 navigation points. There is always one of these navigation points set as active in css:</p>
  
  <pre><code>class="active"
  </code></pre>
  
  <p>All these 4 pages inherit the layout.html.twig file where the navigation is defined. 
  Which is the easiest way to change the class ("active") class depending on the navigation point choosen?</p>
  
  <p>Thanks in advance for your help!</p>