php短信接口

$requestUrl ="http://sms.webchinese.cn/web_api/?"; //接口地址    $par = array(        'Uid' => "yijiabao",        'Key' => "c4321d062b3688bc2a13",        'smsMob' => $phone,        'smsText' => iconv("UTF-8","GBK",$code),    );    $url = $requestUrl . http_build_query($par);    $res = do_post($url, array());    if($res>0){      return array('status' => 0, "", 'msg' => "SUCESS");      }else{            switch ($res) {            case -1:                $msg = "没有该用户账户";                break;            case -2:                $msg = "密钥不正确";                break;            case -3:                $msg = "短信数量不足";                break;            case -11:                $msg = "该用户被禁用";                break;            case -4:                $msg = "手机号格式不正确";                break;            case -41:                $msg = "手机号码为空";                break;            case -42:                $msg = "短信内容为空";                break;            case -51:                $msg = "短信签名格式不正确";                break;            default:                $msg = "未知错误";                break;        }    }    return array('status' => 1, "", 'msg' => $msg);