title: PHP include path sub-folder files not included
body: <p>I have a site where the PHP include path is /usr/share/php
  Within this path I have a sub-folder containing some utility files, e.g. /usr/share/php/utils. my_session.php is one of these utility files.</p>
  
  <p>My application calls </p>
  
  <pre><code>require ("my_session.php");
  </code></pre>
  
  <p>and this works even though the file is actually within the utils folder.</p>
  
  <p>I am trying to replicate this site in another installation and I am getting the error:</p>
  
  <pre><code>Failed opening required 'my_session.php' (include_path='.:/usr/share/php)
  </code></pre>
  
  <p>My question is:</p>
  
  <p>Should the php include path also include files in sub-folders in the include path?
  This appears to be the case on my original site and I don't know why the behaviour seems to be different on the second site.</p>