1.证书位置
    微信退款---一个文件搞定 - 图1
    2.退款文件

    微信退款---一个文件搞定 - 图2
    3.退款代码

    1. <?php
    2. /* 
    3.  * 咔咔
    4.  * 2018.6.21 微信退款
    5.  */
    7. class Refund
    8. {   
    9.     const REFUND = 'https://api.mch.weixin.qq.com/secapi/pay/refund';
    11.     const KEY = 'h5l4P8S3u5n1H5Y4D7E5l9e6J4Y7S8h3';
    12.     const CODEURL = 'https://open.weixin.qq.com/connect/oauth2/authorize?';
    13.     const OPENIDURL = 'https://api.weixin.qq.com/sns/oauth2/access_token?';
    14.     const APPID = 'wxf8a78496174320e9';
    15.     const SECRET = '6806ae46548d5a27e0939f12139e7a42';
    16.     const MCHID = '1502276551';
    17.     const UNURL = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
    19.     private $params;
    20.     public function __construct($data) {
    21.         //组装数据
    22.         $this->params = [
    23.             'appid'   =>  self::APPID, //APPID
    24.             'mch_id'  =>  self::MCHID, //商户号
    25.             'nonce_str'=> md5(time()), //随机串
    26.             'sign'  => 'md5',          //签名方式
    27.             'transaction_id'=> $data['transaction_id'],//微信支付订单号 与商户订单号二选一
    28.             //'out_trade_no'=> '', //商户订单号 和微信支付订单号二选一
    29.             'out_refund_no' => $data['out_refund_no'],//退单号
    30.             'total_fee'     => $data['total_fee'],    //订单金额
    31.             'refund_fee'    => $data['refund_fee']    //退款金额
    32.         ];
    33.     }
    34.     //发送退款请求
    35.     public function orderRefund(){
    36.         //生成签名
    37.         $signParams = $this->setSign($this->params);
    39.         //将数据转换为xml
    40.         $xmlData = $this->ArrToXml($signParams);
    42.         //发送请求
    43.         return  $this->postStr(self::REFUND, $xmlData);
    44.     }
    46.     //post 字符串到接口
    47.     public function postStr($url,$postfields){
    48.         $ch = curl_init();
    49.         $params[CURLOPT_URL] = $url;    //请求url地址
    50.         $params[CURLOPT_HEADER] = false; //是否返回响应头信息
    51.         $params[CURLOPT_RETURNTRANSFER] = true; //是否将结果返回
    52.         $params[CURLOPT_FOLLOWLOCATION] = true; //是否重定向
    53.         $params[CURLOPT_POST] = true;
    54.         $params[CURLOPT_SSL_VERIFYPEER] = false;//禁用证书校验
    55.         $params[CURLOPT_SSL_VERIFYHOST] = false;
    56.         //以下是证书相关代码
    57.         $params[CURLOPT_SSLCERTTYPE] = 'PEM';
    58.         $params[CURLOPT_SSLCERT] = './cert/apiclient_cert.pem';
    59.         $params[CURLOPT_SSLKEYTYPE] = 'PEM';
    60.         $params[CURLOPT_SSLKEY] = './cert/apiclient_key.pem';
    62.         $params[CURLOPT_POSTFIELDS] = $postfields;
    64.         curl_setopt_array($ch, $params); //传入curl参数
    65.         $content = curl_exec($ch); //执行
    67.         curl_close($ch); //关闭连接
    68.         return $content;
    69.     }
    71.     //生成签名
    72.     public function getSign($arr){
    73.         //去除空值
    74.         $arr = array_filter($arr);
    75.         if(isset($arr['sign'])){
    76.             unset($arr['sign']);
    77.         }
    78.         //按照键名字典排序
    79.         ksort($arr);
    80.         //生成url格式的字符串
    81.        $str = $this->arrToUrl($arr) . '&key=' . self::KEY;
    82.        return strtoupper(md5($str));
    83.     }
    84.     //获取带签名的数组
    85.     public function setSign($arr){
    86.         $arr['sign'] = $this->getSign($arr);;
    87.         return $arr;
    88.     }
    89.     public function arrToUrl($arr){
    90.         return urldecode(http_build_query($arr));
    91.     }
    92.     //验证签名
    93.     public function chekSign($arr){
    94.         $sign = $this->getSign($arr);
    95.         if($sign == $arr['sign']){
    96.             return true;
    97.         }else{
    98.             return false;
    99.         }
    100.     }
    103.      //数组转xml
    104.     public function ArrToXml($arr)
    105.     {
    106.             if(!is_array($arr) || count($arr) == 0) return '';
    108.             $xml = "<xml>";
    109.             foreach ($arr as $key=>$val)
    110.             {
    111.                     if (is_numeric($val)){
    112.                             $xml.="<".$key.">".$val."</".$key.">";
    113.                     }else{
    114.                             $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
    115.                     }
    116.             }
    117.             $xml.="</xml>";
    118.             return $xml; 
    119.     }
    120.     public function XmlToArr($xml)
    121.     {   
    122.         if($xml == '') return '';
    123.         libxml_disable_entity_loader(true);
    124.         $arr = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);     
    125.         return $arr;
    126.     }
    129. }
    131. // 获取订单号
    132. $orderdata = D('foodorder')->where([
    133.     'id'=>$_SESSION['orderid']
    134.     ])->find();
    136. // 传值
    137. $data = [
    138.     'transaction_id'    => $orderdata['wx_number'], //微信交易号
    139.     'out_refund_no'    => $orderdata['wx_number'], //退款单号
    140.     'total_fee'    => $orderdata['cash_fee'], //原订单金额
    141.     'refund_fee'    => $orderdata['cash_fee'] //退款金额
    142. ];
    143. // 实例化退款类
    144. $obj = new Refund($data);
    145. // 调用退款方法
    146. $res = $obj->orderRefund();
    147. // 退款微信返回数据
    148. $refunddata = $obj->XmlToArr($res);
    150. if($refunddata['return_code'] == 'SUCCESS'){
    152.     $data['wx_refundorder'] = $orderdata['wx_number'];
    153.     $data['user_id'] = $orderdata['userid'];
    154.     $data['refund_fee'] = $orderdata['cash_fee'];
    155.     $data['refund_time'] = time();
    157.     $refundorder = D('refundorder')->add($data);
    159.     if(!$refundorder){
    160.         $log_name= "./Public/Pay/refund_url.log";//log文件路径
    161.         file_put_contents($log_name,"【退款成功 , 数据库添加失败通知", FILE_APPEND);
    162.     }
    163. }else{
    164.     $log_name= "./Public/Pay/refund_url.log";//log文件路径
    165.     file_put_contents($log_name,"【退款失败", FILE_APPEND);
    166. }

    4.控制器文件
    微信退款---一个文件搞定 - 图3
    5.控制器代码

    1. // 退款
    2.     public function refundmoney() {
    4.         $order_id = I('orderid');
    6.         session('orderid',$order_id);
    8.         vendor('WxPayPubHelper.refund');
    9.         // 查询订单表
    10.         $orderdata = D('foodorder')->where([
    11.             'id'=>$order_id
    12.             ])->find();
    13.         // 查询退款后的数据库
    14.         $refunddata = D('refundorder')->where([
    15.             'wx_refundorder'=>$orderdata['wx_number']
    16.             ])->find(); 
    17.         // 判断是否存在
    18.         if($orderdata){
    19.             // 修改退款的refund状态
    20.             $orderedit = D('foodorder')->where([
    21.                 'id'=>session('orderid')
    22.             ])->setInc('refund');
    23.             // 清除订单id
    24.             session('orderid',null);
    25.             __success('退款成功',U('/addon/WeiuidDeit/web/foodorderindex'));
    26.         }else{
    27.             __error('退款失败');
    28.         }
    30.     }