微信小程序-微信支付退款（可直接使用）

向右看齐 2022-09-04 02:51 206阅读 0赞

//微信退款控制器
    <?php
    namespace app\pay\controller;
    
    /*
     * 小程序微信退款支付
     */
    class Winxinrefund{
    
      protected $SSLCERT_PATH = APP_PATH.'/pay/cert/apiclient_cert.pem';//证书路径
      protected $SSLKEY_PATH =  APP_PATH.'/pay/cert/apiclient_key.pem';//证书路径
      protected $opUserId = '';//商户号
      protected $KEY = '';
    
      function __construct($openid,$outTradeNo,$totalFee,$outRefundNo,$refundFee){
    
        //初始化退款类需要的变量
    
        $this->openid = $openid;
    
        $this->outTradeNo = $outTradeNo;
    
        $this->totalFee = $totalFee*100;
    
        $this->outRefundNo = $outRefundNo;
    
        $this->refundFee = $refundFee*100;
    
      }
    
      public function refund(){
    
        //对外暴露的退款接口
    
        $result = $this->wxrefundapi();
    
        return $result;
    
      }
    
      private function wxrefundapi(){
    
        //通过微信api进行退款流程
    
        $parma = array(
    
          'appid'=> 'wx9aa3d23bd288511a',
    
          'mch_id'=> '1594691381',
    
          'nonce_str'=> $this->createNoncestr(),
    
          'out_refund_no'=> $this->outRefundNo,
    
          'out_trade_no'=> $this->outTradeNo,
    
          'total_fee'=> $this->totalFee,
    
          'refund_fee'=> $this->refundFee
    
        );
        $parma['sign'] = $this->getSign($parma);
    
        $xmldata = $this->arrayToXml($parma);
    
        $xmlresult = $this->postXmlSSLCurl($xmldata,'https://api.mch.weixin.qq.com/secapi/pay/refund');
    
        $result = $this->xmlToArray($xmlresult);
    
        return $result;
    
      }
    protected function getSign($Obj){
        foreach ($Obj as $k => $v){
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        //签名步骤二：在string后加入KEY
        $String = $String."&key=".$this->KEY;
        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
        return $result_;
    }
    
    /*
     *排序并格式化参数方法，签名时需要使用
     */
    protected function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v)
        {
            if($urlencode)
            {
                $v = urlencode($v);
            }
            //$buff .= strtolower($k) . "=" . $v . "&";
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = "";
        if (strlen($buff) > 0)
        {
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }
    
    /*
     * 生成随机字符串方法
     */
    protected function createNoncestr($length = 32 ){
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = 0; $i < $length; $i++ ) {
            $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        }
        return $str;
    }
    //数组转字符串方法
    protected function arrayToXml($arr){
        $xml = "<xml>";
        foreach ($arr as $key=>$val)
        {
            if (is_numeric($val)){
                $xml.="<".$key.">".$val."</".$key.">";
            }else{
                $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml.="</xml>";
        return $xml;
    }
    
    protected static function xmlToArray($xml){
      // dump($xml);die;
        $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $array_data;
    }
    
    //需要使用证书的请求
    private function postXmlSSLCurl($xml,$url,$second=30)
    {
        $ch = curl_init();
        //超时时间
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        //这里设置代理，如果有的话
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
        //设置header
        curl_setopt($ch,CURLOPT_HEADER,FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,TRUE);
        //设置证书
        //使用证书：cert 与 key 分别属于两个.pem文件
        //默认格式为PEM，可以注释
        curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
        curl_setopt($ch,CURLOPT_SSLCERT, $this->SSLCERT_PATH);
        //默认格式为PEM，可以注释
        curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
        curl_setopt($ch,CURLOPT_SSLKEY,$this->SSLKEY_PATH);
        //post提交方式
        curl_setopt($ch,CURLOPT_POST, true);
        curl_setopt($ch,CURLOPT_POSTFIELDS,$xml);
        $data = curl_exec($ch);
        //返回结果
        if($data){
            curl_close($ch);
            return $data;
        }
        else {
            $error = curl_errno($ch);
            echo "curl出错，错误码:$error"."<br>";
            curl_close($ch);
            return false;
       	}
    }
    }

PHP调用退款接口，实现退款功能

$pay = new Winxinrefund($openid,支付时传递的订单号,支付的价格,退款单号,退款金额);
    $result = $pay->refund();

然后就可以成功退款啦。