/** * @return mixed|null|string */ public static function sessionID() { if (!self::$_sessionID) { $session = CRM_Core_Session::singleton(); self::$_sessionID = $session->get('qfSessionID'); if (!self::$_sessionID) { self::$_sessionID = session_id(); $session->set('qfSessionID', self::$_sessionID); } } return self::$_sessionID; }