/**
* Checks to see if their session is still valid in memcache
* @param
* $session_id: The ID of the session we want to check
* @return
* An error string if memcache fails
* A user ID if we find their session
* A null if we don't find their session
*/
function check_session($session_id)
{
// If this person is logged in
$user_id = memcached::get('medusa_sessionid_' . $session_id);
if (is_numeric($user_id)) {
// Refresh their session - if it fails, report it
if (!memcached::set('medusa_sessionid_' . $session_id, $user_id)) {
return 'Memcache Error: ' . memcached::report_last_error() . ' (memcached::set)';
}
// Login still valid, tell them who the user is
return $user_id;
} else {
// Login isn't valid, tell them we aren't a user
return null;
}
}
