PHP development of WeChat refund function case

This article mainly introduces the method of PHP development to implement the WeChat refund function, involving the relevant calling operation skills of PHP for the WeChat interface. Friends in need can refer to it

Recently adjusting the WeChat refund interface, I found that there are many pitfalls, and I would like to share them with you

① If during the test, the web page 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 Web page prompts curl 52 means that you have introduced too few certificates. In the official demo, there are only two certificates, apiclient_cert.pem and apiclient_key.pem. You also need to introduce a certificate rootca.pem. This certificate requires you to log in to your merchant platform. Download
③ If the web page 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 that 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 there is a problem. I put out_refund_no I modified it and found that it works

Note: The unit of the amount is cents

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();

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