微信小程序退款 处理类

<?php
/**
 * 微信小程序退款 处理类
参考
https://www.cnblogs.com/afei-qwerty/p/7922982.html
 *
 */
class WeixinRefundModel extends Model {

    protected $SSLCERT_PATH = './apiclient_cert.pem';//证书路径
    protected $SSLKEY_PATH =  './apiclient_key.pem';//证书路径

//    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;
//        $this->outRefundNo = $outRefundNo;
//        $this->refundFee = $refundFee;
//    }

    /*
     * array(9) {
          ["return_code"] => string(7) "SUCCESS"
          ["return_msg"] => string(2) "OK"
          ["appid"] => string(18) "****************"
          ["mch_id"] => string(10) "8888888"
          ["nonce_str"] => string(16) "V5BUsFl4ikNVwfWz"
          ["sign"] => string(32) "4DD91513B5CDA88C43B9D91DE6CE0C2B"
          ["result_code"] => string(4) "FAIL"
          ["err_code"] => string(13) "ORDERNOTEXIST"
          ["err_code_des"] => string(15) "订单不存在"
    }
     *
     *
     * array(18) {
            ["return_code"] => string(7) "SUCCESS"
            ["return_msg"] => string(2) "OK"
            ["appid"] => string(18) "***************"
            ["mch_id"] => string(10) "****************"
            ["nonce_str"] => string(16) "hYCjvz62vDdPfh3q"
            ["sign"] => string(32) "438E05D357B9090EBA0ED1A11A046B71"
            ["result_code"] => string(7) "SUCCESS"
            ["transaction_id"] => string(28) "4200000288201901186053870346"
            ["out_trade_no"] => string(15) "qs2878042616316"
            ["out_refund_no"] => string(15) "ceshi1547811669"
            ["refund_id"] => string(29) "**************************"
            ["refund_channel"] => array(0) {}
            ["refund_fee"] => string(1) "1"
            ["coupon_refund_fee"] => string(1) "0"
            ["total_fee"] => string(1) "1"
            ["cash_fee"] => string(1) "1"
            ["coupon_refund_count"] => string(1) "0"
            ["cash_refund_fee"] => string(1) "1"
    }
     *
     * */

    //通过微信api进行退款流程
    public function wxrefundapi($out_trade_no,$total_fee,$refund_fee){
        $parma = array(
            'appid'         => C('APPID'),
            'mch_id'        => C('MCHID'),
            'nonce_str'     => $this->createNoncestr(),
            'out_refund_no' => $out_trade_no.rand('1111,9999'), //由后端生成的退款单号，需要保证唯一，因为多个同样的退款单号只会退款一次。
            'out_trade_no'  => $out_trade_no,                   //退款订单在支付时生成的订单号
            'total_fee'     => $total_fee,
            'refund_fee'    => $refund_fee,
            'op_user_id'    => C('MCHID'),          //操作员 op_user_id .与商户号相同即可
        );

        $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);
        setlog($parma,$result,__METHOD__);

        if (!$result){
            $result_arr = [
                'num'     =>      '',
                'desc'   =>      '接口错误',
            ];
            return $result_arr;
        }

        if ($result['result_code'] != 'SUCCESS'){
            $result_arr = [
                'num'     =>      '-1',
                'desc'    =>      $result['err_code_des']
            ];
        } else {
            $result_arr = [
                'num'     =>      '',
                'desc'    =>      '退款成功',
                'data'    =>      $result['refund_id']
            ];
        }

        return $result_arr;
    }

    /*
     * 生成随机字符串方法
     */
    protected function createNoncestr($length =  ){
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = ; $i < $length; $i++ ) {
            $str.= substr($chars, mt_rand(, strlen($chars)-), );
        }
        return $str;
    }

    /*
    * 对要发送到微信统一下单接口的数据进行签名
    */
    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=".C('WEIXIN_PAY_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) > )
        {
            $reqPar = substr($buff, , strlen($buff)-);
        }
        return $reqPar;
    }

    //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 function xmlToArray($xml){
        $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $array_data;
    }

    //需要使用证书的请求
    function postXmlSSLCurl($xml,$url,$second=)
    {
        $ch = curl_init();
        //超时时间
        curl_setopt($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;
        }
    }

}