title: Only variable references should be returned by reference - Codeigniter
body: <p>After the server PHP upgrade I am getting the following error with PHP Version 5.6.2 on Apache 2.0</p>
  
  <pre><code>A PHP Error was encountered
  Severity: Notice
  Message: Only variable references should be returned by reference
  Filename: core/Common.php
  Line Number: 257
  </code></pre>
  
  <p>How can I fix this?</p>