How to get session data when using back-end cache


Active member
dumb question -- i'm trying to troubleshoot a third-party plugin (chat) that integrates with XF's login/sessions, as it should automatically log in any user that has an established XF session.

The problem i'm having is this -- i'm using memcached as a back-end cache, and from what I can tell that means it is caching sessions in memory (the table xf_session is blank)

Unfortunately, some code in the add-on looks like this:

 if (!empty($_COOKIE['xf_session'])) {       
        $sql = ("SELECT `session_data` FROM  `".TABLE_PREFIX."session` WHERE `session_id` = '".$_COOKIE['xf_session']."'");        $query = mysqli_query($GLOBALS['dbh'],$sql);

        $sess2 = mysqli_fetch_assoc($query);
        $sess3 = unserialize($sess2['session_data']);
        if(!empty($sess3['user_id'])) {
            $userid = $sess3['user_id'];
        } else {
            $userid = 0;
It is trying to query the database to get the session data, and failing b/c it finds nothing there.

What's the proper way to do this when sessions are being cached?


Jeff Berry

Well-known member
Have you tried using something like this?

$xfSession = XenForo_Session::getPublicSession(XenForo_Application::getFc()->getRequest());
Not sure how "third party" the plugin you're working with is, but the above line would normally give you the XF session.