Use PHP to implement WeChat refund function

This time I would like to share with you a small function. Many people need to use PHP to implement the WeChat refund function. The code is as follows. You can use it directly, but please note that the unit is divided.

Recently adjusting WeChat There are many pitfalls in the refund interface, and I would like to share with you

① If during testing, the webpage prompts curl 58, it means there is a problem with the path of the certificate (the physical path must be filled in here, which is the absolute path)
② The webpage prompt curl 52 means that you have introduced too few certificates. There are only two certificates apiclient_cert.pem and apiclient_key.pem on the official demo. You also need to introduce a certificate rootca.pem. This certificate requires you to log in to
Download on the merchant platform
③ If the webpage prompts "HTTP/1.1 200 OK Server: nginx Date: Tue, 20 Jun 2017 08:08:01 GMT Content-Type: text/plain Content-Length: 852 Connection: keep- alive Keep-Alive: timeout=8
It means there is no problem with your code. It should be that the parameters are wrong. My previous mistake was to write out_refund_no and out_trade_no the same. This is also written on the WeChat official website, but it still appears. Problem, I modified out_refund_no and found that it works

Note: The unit of amount is cent

The following is the interface I wrote

function Home_index() {
  date_default_timezone_set("Asia/Shanghai");
  $date = date("YmdHis");
  $appid = "";
  $mch_id = "";
  $out_trade_no = "14487658021497944120";
  $op_user_id = "";
  $out_refund_no = $date;
  $total_fee = "500";
  $refund_fee = "500";
//  $transaction_id = "4009542001201706206596667604";
  $key = "";
  $nonce_str = nonceStr();
  $ref = strtoupper(md5("appid=$appid&mch_id=$mch_id&nonce_str=$nonce_str&op_user_id=$op_user_id"
          . "&out_refund_no=$out_refund_no&out_trade_no=$out_trade_no&refund_fee=$refund_fee&total_fee=$total_fee"
          . "&key=$key")); //sign加密MD5
  $refund = array(
  'appid' =>$appid, //应用ID，固定
  'mch_id' => $mch_id, //商户号，固定
  'nonce_str' => $nonce_str, //随机字符串
  'op_user_id' => $op_user_id, //操作员
  'out_refund_no' => $out_refund_no, //商户内部唯一退款单号
  'out_trade_no' => $out_trade_no, //商户订单号,pay_sn码 1.1二选一,微信生成的订单号，在支付通知中有返回
  // 'transaction_id'=>'1',//微信订单号 1.2二选一,商户侧传给微信的订单号
  'refund_fee' => $refund_fee, //退款金额
  'total_fee' => $total_fee, //总金额
  'sign' => $ref//签名
  );
  $url = "https://api.mch.weixin.qq.com/secapi/pay/refund";
  ; //微信退款地址，post请求
  $xml = arrayToXml($refund);
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_HEADER, 1);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1); //证书检查
  if ($useCert == true) {
    // 设置证书
    curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'pem');
    curl_setopt($ch, CURLOPT_SSLCERT, dirname(FILE) . '/WxPay/cert/apiclient_cert.pem');
    curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'pem');
    curl_setopt($ch, CURLOPT_SSLKEY, dirname(FILE) . '/WxPay/cert/apiclient_key.pem');
    curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'pem');
    curl_setopt($ch, CURLOPT_CAINFO, dirname(FILE) . '/WxPay/cert/rootca.pem');
  }
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
  $xml = curl_exec($ch);
  // 返回结果0的时候能只能表明程序是正常返回不一定说明退款成功而已
  if ($xml) {
    curl_close($ch);
    // 把xml转化成数组
    libxml_disable_entity_loader(true);
    $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
//    var_dump($xmlstring);
    $result['errNum'] = 0;
    $result['info'] = object_to_array($xmlstring);
//    var_dump($result);
    return $result;
  } else {
    $error = curl_errno($ch);
    curl_close($ch);
    // 错误的时候返回错误码。
    $result['errNum'] = $error;
    return $result;
  }
}
function arrayToXml($arr) {
  $xml = "<root>";
  foreach ($arr as $key => $val) {
    if (is_array($val)) {
      $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
    } else {
      $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
    }
  }
  $xml .= "</root>";
  return $xml;
}
function object_to_array($obj) {
  $obj = (array) $obj;
  foreach ($obj as $k => $v) {
    if (gettype($v) == &#39;resource&#39;) {
      return;
    }
    if (gettype($v) == &#39;object&#39; || gettype($v) == &#39;array&#39;) {
      $obj[$k] = (array) object_to_array($v);
    }
  }
  return $obj;
}
function nonceStr() {
  $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
  $str = "";
  $length = 32;
  for ($i = 0; $i < $length; $i++) {
    $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
  }
  // 随机字符串
  return $str;
}
Home_index();

I believe you have mastered the method after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

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