②网页提示curl 52 说明你的证书引入少了，在官方的demo上只有两个证书 apiclient_cert.pem和 apiclient_key.pem 你还需要引入一个证书 rootca.pem，这个证书需要你登录到
3.要是网页提示 "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
说明你的代码是没有问题的 ，应该是参数出错了 我之前错的地方是把 out_refund_no和 out_trade_no写的一样，微信官网上也是这样写的 ，但是就是出现问题，我把out_refund_no 修改了一下 发现可以了
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) == 'resource') { return; } if (gettype($v) == 'object' || gettype($v) == 'array') { $obj[$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(); 
