public function tipsRefund()
    {
        $model = D('Common/Order');
        $order_sn = $model->makeOrderSn();
        $transaction_id=I("transaction_id",0);
        $money=I("money",0);
        $order_code=I("order_code",0);
        $openid=I("openid",0);
        $gid=I("gid",0);
//                $transaction_id="4200000826202011216599359363";
//        $money=0.1;
//        $order_code="AB21447453209446";
//        $openid="oxOUw5bmXqK2RzTSXfDLpJoy1pF8";

         $user=M("user")->where(["openid"=>$openid])->find();
            $appid= '';
         $data['appid']=$appid;
        $data['mch_id'] ="";
        $data['nonce_str'] =$order_sn;//退款单号
        $data['transaction_id'] = $transaction_id;//交易单号 流水号
        $data['refund_money'] = $money*100;//退款金额
        $data['total_money'] = $money*100;//退款总金额
        $data['out_refund_no'] = $order_code;//商户内部唯一退款单号
        $res = $this->weChatrefund($data);//小费退款
        $data = array("result" => '1', "message" => "成功!","list"=>$res);


        if ($res['return_code'] =='SUCCESS') {
            M("order")->where(["order_code"=>$order_code])->save(['state'=>9]);
            //记录小费退款日志
            $log2['uid'] = $user['id'];
            $log2['order_code'] = $order_code;
            $log2['status'] = 2;
            $log2['money'] =$money;
            $log2['addtime'] = time();
            $log2['gid'] = $gid;
           M('refund_record ')->add($log2);
            return true;
        } else {
            return false;
        }
    }

private function weChatrefund($data)
{
    $param = array(
        'appid'=>"wx67f5c80eb987ee40",//应用ID，固定
        'mch_id'=>"1601268116",//商户号，固定
        'nonce_str'=> $this->createNoncestr(),
        'out_refund_no'=> $data['out_refund_no'],//商户内部唯一退款单号
        // 'out_trade_no' => $out_trade_no, //商户订单号,pay_sn码 1.1二选一,微信生成的订单号，在支付通知中有返回
        'transaction_id'=>$data['transaction_id'],//微信订单号 1.2二选一,商户侧传给微信的订单号
        'total_fee'=> $data['refund_money'],//退款金额
        'refund_fee'=> $data['total_money'],//总金额
    );
    $param['sign'] = $this->getSign($param);//签名
    $xmldata = $this->arrayToXml($param);
    $xmlresult = $this->postXmlSSLCurl($xmldata,'https://api.mch.weixin.qq.com/secapi/pay/refund');
    $result = $this->xmlToArray($xmlresult);
    return $result;
}
/*
   * 对要发送到微信统一下单接口的数据进行签名
   */
protected function getSign($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="."";
    //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_;
}

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 $reqPar;
}
protected function createNoncestr($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){
    $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
    return $array_data;
}

//需要使用证书的请求
private function postXmlSSLCurl($xml,$url,$second=30)
{

     $server= $_SERVER['DOCUMENT_ROOT'];
    $isdir = "$server/wxzf/cert/apiclient_cert.pem";//证书位置
    $isdir1 = "$server/wxzf/cert/apiclient_key.pem";//证书位置
    $ch = curl_init();
    //超时时间
    curl_setopt($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($ch,CURLOPT_SSLCERT, getcwd().'/apiclient_cert.pem');
    curl_setopt($ch,CURLOPT_SSLCERT, $isdir);
    //默认格式为PEM，可以注释
    curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
    // curl_setopt($ch,CURLOPT_SSLKEY,getcwd().'/apiclient_key.pem');
    curl_setopt($ch,CURLOPT_SSLKEY,$isdir1);
    //post提交方式
    curl_setopt($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;
    }
}