title: Symfony: why the backslash in \DateTime();
body: <p>Why does this line of Symfony code have a backslash before <code>DateTime()</code>?</p>
  
  <pre><code>$this-&gt;updated_datetime = new \DateTime();
  </code></pre>
  
  <p>I'm pretty sure this has something to do with NameSpaces but can someone confirm / clarify...</p>