title: Prevent direct access to a php
body: <p>I don't want to use .htaccess.</p>
  <ul>
  <li><strong>a.php b.php c.php compute.php</strong></li>
  </ul>
  <p><strong>a.php b.php</strong> and <strong>c.php</strong> uses it like this</p>
  <p>$.get(<strong>compute.php</strong>?number=800)</p>
  <p>I want <strong>a.php</strong> <strong>b.php</strong> and <strong>c.php</strong> to be
  able to access <strong>compute.php</strong></p>
  <p>but I don't want to allow this to public.</p>
  <p>http://localhost/<strong>compute.php</strong>?number=800</p>
  <p>Is this possible? </p>