title: Doctrine undefined function apc_fetch
body: <p>I'm using <a href="http://www.joelverhagen.com/blog/2011/05/setting-up-codeigniter-2-with-doctrine-2-the-right-way/">this tutorial</a>, which gives a detail explanation about how to set up CodeIgniter and Doctrine. I'm using CodeIgniter 2.1.0 and Doctrine 2.2.1, but I get this error:</p>
  
  <blockquote>
    <p>Fatal error: Call to undefined function <code>Doctrine\Common\Cache\apc_fetch()</code> in /Applications/XAMPP/xamppfiles/htdocs/emma_watson_shrine/application/libraries/Doctrine/Common/Cache/ApcCache.php on line 52 </p>
  </blockquote>
  
  <p>Can you help me out?</p>