static function sendSMS($arr_numbers, $smscontent)
 {
     try {
         if (!is_array($arr_numbers)) {
             $arr_numbers = array($arr_numbers);
         }
         if (count($arr_numbers) == 0) {
             throw new Exception('Please specify Mobile Phone');
         }
         if (empty($smscontent)) {
             throw new Exception('Please specify SMS content');
         }
         $obj_SMS = new self(self::CONST_USERNAME, self::CONST_PASSWORD, self::CONST_SENDERID);
         foreach ($arr_numbers as $mobile_num) {
             $obj_SMS->appendMobileNum($mobile_num);
         }
         $obj_SMS->setMessage($smscontent);
         $ret_message = $obj_SMS->send();
         if (strstr($ret_message, 'MsgID') === false) {
             throw new Exception($ret_message);
         }
     } catch (Exception $e) {
         return false;
     }
     return true;
 }