微信小程序+PHP接口 支付相关代码

签名报错的几种可能性


1.appid和mch_id（微信支付商户支付号）不匹配，appid是小程序id machid进入https://pay.weixin.qq.com/index.php/core/cert/api_cert关联appid获取machid
2.在https://pay.weixin.qq.com/index.php/core/cert/api_cert手动填写32位key值
PHP完成微信小程序在线支付功能
小程序访问地址：payfee.php 如果使用 TP 框架处理后台的话，写成方法即可

 

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include 'WeixinPay.php';
$appid=''; //小程序appid
$openid= $_POST['id'];
$mch_id=''; //微信支付商户支付号
$key=''; //Api密钥
$out_trade_no = $mch_id. time();
$total_fee = $_POST['fee'];
if (empty($total_fee)) { //押金
    $body = "充值押金";
    $total_fee = floatval(99*100);
} else {
     $body = "充值余额";
     $total_fee = floatval($total_fee*100);
 }
$weixinpay = new WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee);
$return=$weixinpay->pay();

echo json_encode($return);
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<?php

/*
 * 小程序微信支付
 */
class WeixinPay {

    protected $appid;
    protected $mch_id;
    protected $key;
    protected $openid;
    protected $out_trade_no;
    protected $body;
    protected $total_fee;
    function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee) {
        $this->appid = $appid;
        $this->openid = $openid;
        $this->mch_id = $mch_id;
        $this->key = $key;
        $this->out_trade_no = $out_trade_no;
        $this->body = $body;
        $this->total_fee = $total_fee;
    }
    public function pay() {
        //统一下单接口
        $return = $this->weixinapp();
        return $return;
    }


    //统一下单接口
    private function unifiedorder() {
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $parameters = array(
            'appid' => $this->appid, //小程序ID
            'mch_id' => $this->mch_id, //商户号
            'nonce_str' => $this->createNoncestr(), //随机字符串
//            'body' => 'test', //商品描述
            'body' => $this->body,
//            'out_trade_no' => '2018013106125348', //商户订单号
            'out_trade_no'=> $this->out_trade_no,
//            'total_fee' => floatval(0.01 * 100), //总金额 单位 分
            'total_fee' => $this->total_fee,
           'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP
            // 'spbill_create_ip' => '192.168.0.161', //终端IP
            'notify_url' => 'https://www.weixin.qq.com/wxpay/notify.php', //通知地址  确保外网能正常访问
            'openid' => $this->openid, //用户id
            'trade_type' => 'JSAPI'//交易类型
        );
        //统一下单签名
        
        $parameters['sign'] = $this->getSign($parameters);
        // print_r($parameters);
        $xmlData = $this->arrayToXml($parameters);
        $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));
        return $return;
    }


    private static function postXmlCurl($xml, $url, $second = 30) 
    {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
        //设置header
        curl_setopt($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, $xml);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 40);
        set_time_limit(0);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            throw new WxPayException("curl出错，错误码:$error");
        }
    }
    
    
    
    //数组转换成xml
    private function arrayToXml($arr) {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }


    //xml转换成数组
    private function xmlToArray($xml) {
        //禁止引用外部xml实体 
        libxml_disable_entity_loader(true);
        $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
        $val = json_decode(json_encode($xmlstring), true);
        return $val;
    }


    //微信小程序接口
    private function weixinapp() {
        //统一下单接口
        $unifiedorder = $this->unifiedorder();
    //    print_r($unifiedorder);
        $parameters = array(
            'appId' => $this->appid, //小程序ID
            'timeStamp' => '' . time() . '', //时间戳
            'nonceStr' => $this->createNoncestr(), //随机串
            'package' => 'prepay_id=' . $unifiedorder['prepay_id'], //数据包
            'signType' => 'MD5'//签名方式
        );
        //签名
        $parameters['paySign'] = $this->getSign($parameters);
        $str = preg_replace('/"(\w+)"(\s*:\s*)/is', '$1$2', $parameters);
        // print_r($parameters);
        return $str;
    }


    //作用：产生随机字符串，不长于32位
    private 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; 
     }

    //作用：生成签名 
     private 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_;
    }


    ///作用：格式化参数，签名过程需要使用
    private function formatBizQueryParaMap($paraMap, $urlencode) {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }


}
?>
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<?php   
include "app_config.php";
date_default_timezone_set('PRC');
$str='<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
        echo $str;
$times = date("Y-m-d H:i:s",time());
    //获取接口数据，如果$_REQUEST拿不到数据，则使用file_get_contents函数获取
    $post = $_REQUEST;
    if ($post == null) {
        $post = file_get_contents("php://input");
    }
 
    if ($post == null) {
        $post = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : '';
    }
 
    if (empty($post) || $post == null || $post == '') {
        //阻止微信接口反复回调接口 
        $str='<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
        echo $str;
        exit('Notify 非法回调');
    }  
 
    libxml_disable_entity_loader(true); //禁止引用外部xml实体
 
    $xml = simplexml_load_string($post, 'SimpleXMLElement', LIBXML_NOCDATA);//XML转数组
    
    $post_data = (array)$xml;
    
    /** 解析出来的数组
        *Array
        * (
        * [appid] => wx1c870c0145984d30
        * [bank_type] => CFT
        * [cash_fee] => 100
        * [fee_type] => CNY
        * [is_subscribe] => N
        * [mch_id] => 1297210301
        * [nonce_str] => gkq1x5fxejqo5lz5eua50gg4c4la18vy
        * [openid] => olSGW5BBvfep9UhlU40VFIQlcvZ0
        * [out_trade_no] => fangchan_588796
        * [result_code] => SUCCESS
        * [return_code] => SUCCESS
        * [sign] => F6890323B0A6A3765510D152D9420EAC
        * [time_end] => 20180626170839
        * [total_fee] => 100
        * [trade_type] => JSAPI
        * [transaction_id] => 4200000134201806265483331660
        * )
    **/
    //订单号
    $out_trade_no = isset($post_data['out_trade_no']) && !empty($post_data['out_trade_no']) ? $post_data['out_trade_no'] : 0;



    $myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
    $txt = "商户订单号:".$out_trade_no."\n交易时间:".$post_data['time_end']
    ."\n微信订单号:".$post_data['transaction_id']."\n订单金额:".($post_data['total_fee']/100).
    "$\n用户ID:".$post_data['openid']."用户数据:".$post_data['attach'];
    fwrite($myfile, $txt);
    fclose($myfile);

        $dataArray = explode("(LINE)", $post_data['attach']);
        // 查询商户订单号是否存在，如果存在则进行插入

        // 若商户订单号不存在进行插入
        $sel_sql = "SELECT * FROM lx_xiasongform WHERE `data_order`='$out_trade_no'";
        $sel_res = mysql_query($sel_sql);
        if($sel_res){
            // 执行成功
            if(mysql_num_rows($sel_res) > 0){
                // 订单号存在，什么都不执行
            }else{
                $item01 = $dataArray[0];
                $item02 = $dataArray[1];
                $item03 = $dataArray[2];
                $item04 = $dataArray[3];
                $item05 = $dataArray[4];
                $item06 = $dataArray[5];
                $item07 = $dataArray[6];
                if(strlen($item01) > 1 && strlen($item02) > 1 && strlen($item03) > 1 && strlen($item04) > 1 && strlen($item05) > 1 && strlen($item06) > 1 && strlen($item07) > 10){
                    $dingdan = $post_data['out_trade_no'];
                    $insert_sql = "INSERT INTO lx_xiasongform (data_lou,data_lou_num,data_kuaidi_type,data_kuaidi_num,data_name,data_phone,data_order,data_time,data_uid) VALUES ('$item01','$item02','$item03','$item04','$item05','$item06','$dingdan','$times','$item07')";
                    mysql_query($insert_sql);
                    mysql_close($con);
                    $str='<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
                    echo $str;
                }
                    
            }
        }
    //阻止微信接口反复回调接口  文档地址 https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=9_7&index=7，下面这句非常重要!!!
    $str='<xml>O<return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[K]]></return_msg></xml>';  
    echo $str;
    function MakeSign($params,$key){
        //签名步骤一：按字典序排序数组参数
        ksort($params);
        $string = ToUrlParams($params);  //参数进行拼接key=value&k=v
        //签名步骤二：在string后加入KEY
        $string = $string . "&key=".$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;
    }
 
    function ToUrlParams( $params ){
        $string = '';
        if( !empty($params) ){
            $array = array();
            foreach( $params as $key => $value ){
                $array[] = $key.'='.$value;
            }
            $string = implode("&",$array);
        }
        return $string;
}
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//根据code获取openid等信息
    wx.login({
      //获取code
      success: function (res) {
        var code = res.code; //返回code
        console.log(code);
        var appId = 'wxae7ccb47501b13a3';
        var secret = '354ea14b843aa16af18cd81c21da34b1';
        wx.request({
          url: 'https://api.weixin.qq.com/sns/jscode2session?appid=' + appId + '&secret=' + secret + '&js_code=' + code + '&grant_type=authorization_code',
          data: {},
          header: {
            'content-type': 'json'
          },
          success: function (res) {
            console.log(res.data)
            console.log(res.data.openid)
            wx.setStorageSync('session', res.data.session_key)
            wx.setStorageSync('openid', res.data.openid)

            var openid = res.data.openid //返回openid
            console.log('openid为' + openid);
          }
        })
      }
    });
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 wx.request({
      url: app.globalData.requestur3 +'payfee.php',  //换成自己的请求地址
      // url: app.globalData.requestur3 + 'wxpay/Pay.php',

      data: {
        id: openid,//获取用户 openid
        fee: money, //价格
        openid: openid
      },
      header: {
        'Content-Type': 'application/x-www-form-urlencoded'
      },
      method: 'post',
      success: function (res) {
        var key = '354ea14b843aa16af18cd81c21da34b1';
        console.log(res.data);
        console.log('调起支付');
        wx.requestPayment({
          'timeStamp': res.data.timeStamp,
          'nonceStr': res.data.nonceStr,
          'package': res.data.package,
          'signType': res.data.signType,
          'paySign': res.data.paySign,
          'success': function (res) {
            console.log('success');
            wx.showToast({
              title: '支付成功',
              icon: 'success',
              duration: 3000
            });
          },
          'fail': function (res) {
            console.log(res);
          },
          'complete': function (res) {
            console.log('complete');
          }
        });
      },
      fail: function (res) {
        console.log(res.data)
      }
    })
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