title: Escaping backslash in namespaces with DQL (Doctrine 2)
body: <p>I'm a bit confused about writing queries in DQL.
  From the official documentation:</p>
  
  <pre><code>$query = $em-&gt;createQuery('SELECT u FROM MyProject\Model\User u WHERE u.age &gt; 20');
  </code></pre>
  
  <p>Why the backslash of the namespace is not escaped?<br>
  I'm getting a warning in Zend Studio for that reason, and it works anyway, but I think is just "luck", because neither \M nor \U are valid escaped sequences.</p>
  
  <p>What do you think? is safe to use that syntax? or is better to escape the "\" always in DQL?</p>
  
  <pre><code>$query = $em-&gt;createQuery('SELECT u FROM MyProject\\Model\\User u WHERE u.age &gt; 20');
  </code></pre>