title: Symfony2 and HHVM Declaration of Doctrine\DBAL\Driver\PDOConnection::prepare() must be compatible
body: <p>i am trying to set up a symfony2 project on a HHVM machine,</p>
  
  <p>The HHVM is running on FastCGI as explained in the hhvm tutorial, thus running behind an apache2 server on Debian.</p>
  
  <p>I have created everything but when i try to run my application i am getting the following error:</p>
  
  <pre><code>ContextErrorException: 16777217: Declaration of Doctrine\DBAL\Driver\PDOConnection::prepare() must be compatible with that of Doctrine\DBAL\Driver\Connection::prepare() in /LOCATION/shared/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php line 30
  </code></pre>
  
  <p>I am thinking this has something to do with PDO in HHVM but i tested it using the class_exists('PDO') and that says that PDO is enabled</p>