public function deny_unsubscribe_request_multiTask()
 {
     $_requests = Get::req('requests', DOTY_MIXED, FALSE);
     if (!$_requests) {
         //...
     }
     $res = TRUE;
     $smodel = new SubscriptionAlms();
     $list = explode(",", $_requests);
     foreach ($list as $request) {
         list($user_id, $idCourse, $res_id, $r_type) = explode("_", $request);
         switch ($r_type) {
             case "course":
                 $res = $smodel->unsetUnsubscribeRequest($user_id, $idCourse);
                 break;
             case "edition":
                 $res = $smodel->unsetUnsubscribeRequest($user_id, $idCourse, $res_id);
                 break;
             case "classroom":
                 $res = $smodel->unsetUnsubscribeRequest($user_id, $idCourse, false, $res_id);
                 break;
         }
     }
     $output = array('success' => $res ? TRUE : FALSE);
     echo $this->json->encode($output);
 }