title: Internal Server Error in Subdomains using PHP
body: <p>My site is a subdomain.</p>
  
  <p>When I load a file from a folder, which is in the root folder, it displays an internal server error in firebug.</p>
  
  <p>Why does my subdomain displays internal server errors?</p>
  
  <p>This is the php code:</p>
  
  <pre><code> require_once 'xxx/test.php';
  </code></pre>
  
  <p><code>xxx</code> is a directory in the root folder and I am trying to load the <code>test.php</code> page. That's where I got the internal server error.</p>