微信支付APP服务端(PHP语言)

//第一部分生成预支付订单信息
    public function getPrePayOrder(){
        $request = request();
        $data_get = $request->param();
        $uid = $data_get['uid'];
        $price = $data_get['price'];
        $datas = array(
            'uid'=>$uid,
            'price'=>$price,
            'ordersn'=>time().rand(1000,9999),
            'productname'=>'APP充值',
            'addtime'=>time(),
            'status'=>2//未充值
        );
        db('orders')->insert($datas);
        $where['uid'] = $uid;
        $where['status'] = 2;
        $res = db('orders')->where($where)->order('addtime desc')->find();
        $body = 'APP充值'; //商品描述
        $out_trade_no = $res['ordersn']; //订单号
        $total_fee = $price*100; //总金额
        require_once(EXTEND_PATH.'Wxpay/Wxpay.php');
        $wxpay = new Wxpay();
        $red = $wxpay->getPrePayOrder($body,$out_trade_no,$total_fee);//获取预支付订单
        $red = $wxpay->getOrder($red['prepay_id']);//执行第二次签名，才能返回给客户端使用
        echo json_encode(array('response'=>$red));
    }
//第二部分调用统一下单接口
class Wxpay{

	 //配置参数
     private $config = array(
        'appid' => "wxf752c577550819a3",    //微信开放平台上的应用id
        'mch_id' => "1503628341",   //微信申请成功之后邮件中的商户id
        'api_key' => "xianxuanyanshidaixinxikeji669123",    //在微信商户平台上自己设定的api密钥 32位
        'notify_url' => 'http://117.34.109.195:81/public/wxpay.php' //自定义的回调程序地址/
    );
    //获取预支付订单
    public function getPrePayOrder($body, $out_trade_no, $total_fee){
        $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        $notify_url = $this->config["notify_url"];
        $onoce_str = $this->getRandChar(32);
        $data["appid"] = $this->config["appid"];
        $data["body"] = $body;
        $data["mch_id"] = $this->config['mch_id'];
        $data["nonce_str"] = $onoce_str;
        $data["notify_url"] = $notify_url;
        $data["out_trade_no"] = $out_trade_no;
        $data["spbill_create_ip"] = $this->get_client_ip();
        $data["total_fee"] = $total_fee;
        $data["trade_type"] = "APP";
        $s = $this->getSign($data, false);
        $data["sign"] = $s;
        $xml = $this->arrayToXml($data);
        $response = $this->postXmlCurl($xml, $url);
        //将微信返回的结果xml转成数组
        return $this->xmlstr_to_array($response);
    }
    //执行第二次签名，才能返回给客户端使用
    public function getOrder($prepayId){
        $data["appid"] = $this->config["appid"];
        $data["noncestr"] = $this->getRandChar(32);
        $data["package"] = "Sign=WXPay";
        $data["partnerid"] = $this->config['mch_id'];
        $data["prepayid"] = $prepayId;
        $data["timestamp"] = time();
        $s = $this->getSign($data, false);
        $data["sign"] = $s;
        return $data;
    }

    /*生成签名*/
    function getSign($Obj){
        foreach ($Obj as $k => $v){
            $Parameters[strtolower($k)] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        //echo "【string】 =".$String."</br>";
        //签名步骤二：在string后加入KEY
        $String = $String."&key=".$this->config['api_key'];
        //echo "<textarea style='width: 50%; height: 150px;'>$String</textarea> <br />";
        //签名步骤三：MD5加密
        $result_ = strtoupper(md5($String));
        return $result_;
    }

    //获取指定长度的随机字符串
    function getRandChar($length){
        $str = null;
        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
        $max = strlen($strPol)-1;
        for($i=0;$i<$length;$i++){
            $str.=$strPol[rand(0,$max)];//rand($min,$max)生成介于min和max两个数之间的一个随机整数
        }
        return $str;
    }
    //数组转xml
    function arrayToXml($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;
    }

    //post https请求，CURLOPT_POSTFIELDS xml格式
    function postXmlCurl($xml,$url,$second=30){
        //初始化curl
        $ch = curl_init();
        //超时时间
        curl_setopt($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($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if($data){
            curl_close($ch);
            return $data;
        }else {
            $error = curl_errno($ch);
            echo "curl出错，错误码:$error"."<br>";
            echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";
            curl_close($ch);
            return false;
        }
    }

    /*获取当前服务器的IP*/
    function get_client_ip(){
        if ($_SERVER['REMOTE_ADDR']) {
            $cip = $_SERVER['REMOTE_ADDR'];
        } elseif (getenv("REMOTE_ADDR")) {
            $cip = getenv("REMOTE_ADDR");
        } elseif (getenv("HTTP_CLIENT_IP")) {
            $cip = getenv("HTTP_CLIENT_IP");
        } else {
            $cip = "unknown";
        }
        return $cip;
    }

    //将数组转成uri字符串
    function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v)
        {
            if($urlencode)
            {
                $v = urlencode($v);
            }
            $buff .= strtolower($k) . "=" . $v . "&";
        }
        $reqPar = '';
        if (strlen($buff) > 0)
        {
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }

    /*xml转成数组*/
    function xmlstr_to_array($xmlstr) {
        $array_data = json_decode(json_encode(simplexml_load_string($xmlstr, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $array_data;
    }
    function domnode_to_array($node) {
        $output = array();
        switch ($node->nodeType) {
            case XML_CDATA_SECTION_NODE:
            case XML_TEXT_NODE:
                $output = trim($node->textContent);
                break;
            case XML_ELEMENT_NODE:
                for ($i=0, $m=$node->childNodes->length; $i<$m; $i++) {
                    $child = $node->childNodes->item($i);
                    $v = $this->domnode_to_array($child);
                    if(isset($child->tagName)) {
                        $t = $child->tagName;
                        if(!isset($output[$t])) {
                            $output[$t] = array();
                        }
                        $output[$t][] = $v;
                    }
                    elseif($v) {
                        $output = (string) $v;
                    }
                }
                if(is_array($output)) {
                    if($node->attributes->length) {
                        $a = array();
                        foreach($node->attributes as $attrName => $attrNode) {
                            $a[$attrName] = (string) $attrNode->value;
                        }
                        $output['@attributes'] = $a;
                    }
                    foreach ($output as $t => $v) {
                        if(is_array($v) && count($v)==1 && $t!='@attributes') {
                            $output[$t] = $v[0];
                        }
                    }
                }
                break;
        }
        return $output;
    }
    
   

```
第三部分 回调
<?php
$xml = file_get_contents('php://input');
$arr = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
/*$data_arr = json_encode($arr);
$myfile = fopen("wx.txt", "w+") or die("Unable to open file!");
fwrite($myfile,$data_arr);
fclose($myfile);*/
$data = $arr;
$signA = "appid=".$data['appid']."&bank_type=".$data['bank_type']."&cash_fee=".$data['cash_fee']."&fee_type=".$data['fee_type']."&is_subscribe=".$data['is_subscribe']."&mch_id=".$data['mch_id']."&nonce_str=".$data['nonce_str']."&openid=".$data['openid']."&out_trade_no=".$data['out_trade_no']."&result_code=".$data['result_code']."&return_code=".$data['return_code']."&time_end=".$data['time_end']."&total_fee=".$data['total_fee']."&trade_type=".$data['trade_type']."&transaction_id=".$data['transaction_id']."&key=xianxuanyanshidaixinxikeji669123";
//md5处理
$sign = md5($signA);
//转大写
$sign = strtoupper($sign);
//验签名。默认支持MD5
if ( $sign === $arr['sign']){
    // 校验返回的订单金额是否与商户测的订单金额一致。修改订单表中的支付状态。
    $ordersn = $arr['out_trade_no'];//订单号
    $pay_money = $arr['total_fee']/100;//交易金额
    //此处编写回调处理逻辑
    header("Content-type: text/html; charset=utf-8");
    try{
        $conn = new PDO("mysql:host=localhost;dbname=xingzuo","root","167669123");
        $conn->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
    }catch(PDOException $e){
        echo"数据库连接失败".$e->getMessage();
    }
    $sql1 = "select * from `orders` where ordersn ='".$ordersn."'";//按订单号查询
    $orders = $conn->query($sql1)->fetch(PDO::FETCH_ASSOC);
    $money = $orders['price'];
    if($money == $pay_money){
        //更新支付状态
        $sql2 = "update `orders` set status='1' where id = '" .$orders['id']."'";
        $res2 = $conn->prepare($sql2);
        $res2 ->execute();
        //更新支付类型
        $sql3 = "update `orders` set paytype='1'where id = '" .$orders['id']."'";
        $res3 = $conn->prepare($sql3);
        $res3 ->execute();
        //更新用户的账户余额
        $user = "select * from `user` where id ='".$orders['uid']."'";
        $user = $conn->query($user)->fetch(PDO::FETCH_ASSOC);
        $balance = $user['balance'];
        $money = $balance + $pay_money;
        $sql4 = "update `user` set balance='".$money."' where id = '" .$orders['uid']."'";
        $res4 = $conn->prepare($sql4);
        $res4 ->execute();
        //更新消费记录表
        $note = '充值';
        $time = time();
        $sql5 = "insert into consumption(id,uid,amount,note,type,addtime,status) VALUES (null,'".$orders['uid']."','".$pay_money."','".$note."','1','".$time."','1')";
        $res5 = $conn->prepare($sql5);
        $abc  = $res5->execute();
        if($abc){
            die('success');
        }else{
            exit('fail');
        }
    }else{
        exit('fail');
    }
}
$return = ['return_code'=>'SUCCESS','return_msg'=>'OK'];
$xml = '<xml>';
foreach($return as $k=>$v){
    $xml.='<'.$k.'><![CDATA['.$v.']]></'.$k.'>';
}
$xml.='</xml>';
echo $xml;