private function checkQR($tQR)
 {
     $result = true;
     $qr = new QRModel();
     $qr->getByID(base64_decode($tQR));
     if ($qr->textQR == null || $qr->textQR == "") {
         return false;
     }
     if ($qr->status == "0") {
         $qr->status = "1";
         $qr->save();
         $result = true;
     } else {
         $result = false;
     }
     return $result;
 }