/**
   * [refund description]
   * @Author   m.txwhj.cn
   * @DateTime 2022-12-08T13:39:50+0800
   * @param    [type]                   $appid         [小程序或公眾號appid]
   * @param    [type]                   $mch_id        [商戶ID]
   * @param    [type]                   $nonce_str     [隨機數]
   * @param    [type]                   $out_trade_no  [原訂單單號]
   * @param    [type]                   $out_refund_no [退款單號]
   * @param    [type]                   $total_fee     [訂單金額]
   * @param    [type]                   $refund_fee    [退款金額]
   * @param    [type]                   $mckey         [商戶32位key]
   * @return   [type]                                  [description]
   */
  public function refund($appid,$mch_id,$nonce_str,$out_trade_no,$out_refund_no,$total_fee,$refund_fee,$mckey)
  {
    $arrdata = array("mch_id" => $mch_id,"appid" => $appid, "nonce_str" => $nonce_str, "out_trade_no" => $out_trade_no, "out_refund_no" => $out_refund_no, "total_fee" => $total_fee, "refund_fee" => $refund_fee);


    ksort($arrdata);
    $paramstring = "";
    foreach($arrdata as $key => $value)
    {
    if(strlen($paramstring) == 0)
      $paramstring .= $key . "=" . $value;
      else
      $paramstring .= "&" . $key . "=" . $value;
    }

    $stringSignTemp = $paramstring . "&key=" . $mckey;

    $signValue = strtoupper(md5($stringSignTemp));
      
    $returValue = '';
    foreach($arrdata as $key => $value)
    {
      $returValue .= "<$key>".$value."";
    
    }
    $returValue .= "".$signValue."";
    $returValue .= '';
     var_dump($returValue);
    $result = $this->order_refund_request("https://api.mch.weixin.qq.com/secapi/pay/refund",$returValue);
    

    if ($result)
    {
      $json = $this->xmlToArray($result);
      return $json;
    }
    return false;
  }


  function order_refund_request($url, $data = null)
{
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    if (!empty($data)) {
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    }
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    //證書設置
    curl_setopt($curl, CURLOPT_SSLCERTTYPE, 'PEM');
    curl_setopt($curl, CURLOPT_SSLCERT, DDROOT . '/cert/apiclient_cert.pem');//客戶端cert路徑 DDROOT是我這邊系統常量自行改下
    curl_setopt($curl, CURLOPT_SSLKEYTYPE, 'PEM');
    curl_setopt($curl, CURLOPT_SSLKEY, DDROOT . '/cert/apiclient_key.pem');//客戶端key路徑

    $output = curl_exec($curl);
    curl_close($curl);
    return $output;
}


  public function xmlToArray($xml)
  {   
        //將XML轉為array        
        $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);    
    return $array_data;
  }

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