title: I'd like to kill a session after a user has been inactive for 20 minutes. in PHP
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/520237/how-do-i-expire-a-php-session-after-30-minutes">How do I expire a PHP session after 30 minutes?</a>  </p>
  </blockquote>
  
  
  
  <p>I'd like to kill a session after a user has been inactive for 20 minutes.</p>