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   totalFee = $totalFee;//订单金额        $this->refundFee = $refundFee;//退款金额        $this->outTradeNo = $outTradeNo;//订单号        $this->outRefundNo = $outRefundNo;//退款订单        $this->opUserId = config('wxpay.mch_id');        $this->key = config('wxpay.key');        $this->appId = config('wxpay.app_id');        $this->SSLCERT_PATH = dirname(__FILE__) . '/cert/apiclient_cert.pem';        $this->SSLKEY_PATH = dirname(__FILE__) . '/cert/apiclient_key.pem';    }    /**     * 通过微信api进行退款流程 唯一对外接口     * @return string     */    public function refundApi()    {        $parma = array(            'appid' => $this->appId,            'mch_id' => $this->opUserId,            'nonce_str' => $this->randoms(32),            'out_refund_no' => $this->outRefundNo,            'out_trade_no' => $this->outTradeNo,            'total_fee' => intval($this->totalFee * 100),            'refund_fee' => intval($this->refundFee * 100),        );        $parma['sign'] = $this->getSign($parma, $this->key);        $xmldata = $this->arrayToXml($parma);        $xmlresult = $this->postXmlSSLCurl($xmldata, 'https://api.mch.weixin.qq.com/secapi/pay/refund');        halt($xmlresult);        $result = $this->arrayToXml($xmlresult);        return $result;    }    /**     * 数组转xml     * @param $arr     * @return string     */    protected function arrayToXml($arr = '')    {        $xml = "
   
    ";        foreach ($arr as $key => $val) {            if (is_numeric($val)) {                $xml .= "<" . $key . ">" . $val . "
    ";            } else {                $xml .= "<" . $key . ">
    ";            }        }        $xml .= "
   ";        return $xml;    }    /**     * 签名加密     * @param $params     * @param $key     */    protected function getSign($params, $key)    {        ksort($params, SORT_STRING);        $unSignParaString = $this->formatQueryParaMap($params, false);        return $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));    }    /**     * 排序     * @param $paraMap     * @param bool $urlEncode     * @return bool|string     */    protected function formatQueryParaMap($paraMap, $urlEncode = false)    {        $buff = "";        ksort($paraMap);        foreach ($paraMap as $k => $v) {            if (null != $v && "null" != $v) {                if ($urlEncode) {                    $v = urlencode($v);                }                $buff .= $k . "=" . $v . "&";            }        }        $reqPar = '';        if (strlen($buff) > 0) {            $reqPar = substr($buff, 0, strlen($buff) - 1);        }        return $reqPar;    }    /**     * 需要使用证书的请求     * @param $xml     * @param $url     * @param int $second     * @return bool|mixed     */    protected function postXmlSSLCurl($xml, $url, $second = 30)    {        $ch = curl_init();        curl_setopt($ch, CURLOPT_TIMEOUT, $second);        curl_setopt($ch, CURLOPT_URL, $url);        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);        curl_setopt($ch, CURLOPT_HEADER, FALSE);        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);        curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');        curl_setopt($ch, CURLOPT_SSLCERT, $this->SSLCERT_PATH);        curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');        curl_setopt($ch, CURLOPT_SSLKEY, $this->SSLKEY_PATH);        curl_setopt($ch, CURLOPT_POST, true);        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);        $data = curl_exec($ch);        if ($data) {            curl_close($ch);            return $data;        } else {            $error = curl_errno($ch);            echo "curl出错，错误码:$error" . "
";            curl_close($ch);            return false;        }    }    protected function randoms($length = 32)    {        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";        $str = "";        for ($i = 0; $i < $length; $i++) {            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);        }        return $str;    }}

去调用上面的退款$refundObj = new WXRefund($order['order_number'], $order['money'], $order['order_number'], $order['money']);$result = $refundObj->refundApi();

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