public function Scan()
 {
     $userId = $_GET["user_id"];
     $qr = $_GET["QR"];
     $qrs = new QRModel();
     //////validate QR Code
     $resQrs = $qrs->getWhere("textQR='{$qr}'");
     if (count($resQrs) == 1) {
         if ($resQrs[0]->status == 0) {
             $this->error("Unasigned QR Code!");
         }
     } else {
         $this->error("Wrong QR Code!");
     }
     ///////fetch user details
     $user = new UserModel();
     $user->getByID($userId);
     //        pr($user);
     if ($user->user_name == null || $user->user_name == "") {
         $this->error("Who Are You ?!");
     }
     ///////validate Table
     $ta = new MasterTableModel();
     $arr = $ta->getWhere("QR='{$qr}'");
     if (count($arr) == 1) {
         //status 0 = OCCUPIED
         if ($arr[0]->status == 0) {
             if ($arr[0]->id_order == 0) {
                 $this->error("Empty Order ID");
             } else {
                 $this->requestJoinTable($user, $arr[0]->id_order);
             }
         } else {
             $this->requestRestoPermission($user, $arr[0]);
         }
     } else {
         $this->error("Wrong Table!");
     }
     die;
 }
 public static function isQRValid($QR)
 {
     $objQR = new QRModel();
     $arrQR = $objQR->getWhere("textQR='{$QR}'");
     if (count($arrQR) == 0) {
         return false;
     } else {
         return true;
     }
 }
 public static function isQRValid($QR)
 {
     $objQR = new QRModel();
     $arrQR = $objQR->getWhere("textQR='{$QR}'");
     return count($arrQR) >= 1;
 }