微信小程序支付PHP

服务器端获取 openid

Getopenid.php

<?php
    header('Content-type: application/json; charset=UTF-8');
    $APPID="";//填写小程序appid
    $SECRET="";//填写小程序secret
    $JSCODE="";
    if(isset($_GET['js_code'])){
        $JSCODE=$_GET['js_code'];
        $url="https://api.weixin.qq.com/sns/jscode2session?appid=".$APPID
        ."&secret=".$SECRET."&js_code=".$JSCODE."&grant_type=authorization_code";
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_HEADER, 0);
        $data = curl_exec($curl);
        $array=json_decode($data,true);

        curl_close($curl);
        $openid=isset($array['openid'])?$array['openid']:$array['errcode'];
        if($openid=="40029"){
            $response["result"] = 0;
            $response["msg"] = "invalid code";
            $response["openid"] = $openid;
            echo json_encode($response);
        }else{
            $response["result"] = 1;
            $response["msg"] = "user exist";
            $response["openid"] = $openid;
            echo json_encode($response);
        }
    }

小程序存储openid
在app.js中

getUserInfo:function(cb){
    var that = this
    if(this.globalData.userInfo){
      typeof cb == "function" && cb(this.globalData.userInfo)
    }else{
      wx.login({
        success: function (res) {
          if (res.code) {
            var code = res.code;
            wx.getUserInfo({
              success: function (res2) {
                console.log(res2);
                that.globalData.userInfo = res2.userInfo;
                typeof cb == "function" && cb(that.globalData.userInfo)
                var encryptedData = encodeURIComponent(res2.encryptedData);//一定要把加密串转成URI编码
                var iv = res2.iv;
                //请求自己的服务器
                //Login(code, encryptedData, iv);
                wx.showToast({
                  title: '正在登录...',
                  icon: 'loading',
                  duration: 10000
                });
                //请求服务器
                wx.request({
                  url: API_URL,//Getopenid.php
                  data: {
                    js_code: code,
                  },
                  method: 'GET',
                  header: {
                    'content-type': 'application/json'
                  }, // 设置请求的 header
                  success: function (res) {
                    // success
                    wx.hideToast();
                    console.log("JSON:" + res.data);
                    if (res.data.result=="1"){//获取openid成功
                      wx.setStorage({//存储openid
                        key: "openid",
                        data: res.data.openid
                      })
                    }else{
                      wx.showToast({
                        title: 'openid获取失败',
                        icon: 'none',
                        duration: 2000
                      })
                    }
                    console.log('服务器返回' + res.data.result);
                    console.log('服务器返回' + res.data.msg);
                    console.log('服务器返回' + res.data.openid);
                  },
                  fail: function () {
                    // fail
                    // wx.hideToast();
                  },
                  complete: function () {
                    // complete
                  }
                })
              }
            })
          } else {
            console.log('获取用户登录态失败！' + res.errMsg)
          }
        }
      })
    }
  }

在登陆界面获取openid

var app = getApp()
onLoad: function () {
    console.log('onLoad')
    var that = this
    //调用应用实例的方法获取全局数据
    app.getUserInfo(function(userInfo){//获取用户信息 
      //更新数据
      that.setData({
        userInfo:userInfo
      })
  })
}

通过以上步骤已经获取到openid

支付方法小程序

pay() {
    var that = this;
    if (this.data.totalPrice == 0) {
      return;
    }
    wx.getStorage({//获取存储在本地的openid
      key: 'openid',
      success: function (res) {
        console.log(res.data)
        that.setData({
          openid:res.data,
        })
        var carArray = that.data.carArray;
        var str="";
        for (var i = 0; i < carArray.length; i++) {
          str=str+ carArray[i].num+"个" + carArray[i].name+" ";
        }
        wx.request({
          url: 'Pay.php',//支付接口
          data: {
            openid: res.data,//openid
            total_fee: that.data.totalPrice,//总金额
            body: str,//商品描述
          },
          method:'GET',
          success:function(res){
            console.log(res.data['timeStamp'])
            if(res.data){
              wx.requestPayment({
                'timeStamp': res.data['timeStamp'],
                'nonceStr': res.data['nonceStr'],
                'package': res.data['package'],
                'signType': 'MD5',
                'paySign': res.data['paySign'],
                'success': function (res) {
                  wx.showToast({
                    title: '支付成功',
                    icon: 'succes',
                    duration: 1000,
                    mask: true
                  })
                  //支付成功后在数据库减去购买商品的数量
                  var carArray = that.data.carArray;
                  for (var i = 0; i < carArray.length; i++) {
                    that.setData({
                      jiesuan_num: carArray[i].num,
                      jiesuan_id: carArray[i].goods_id,
                    })
                    DeGood(that);
                  }
                },
                'fail': function (res) {
                  wx.showToast({
                    title: '支付失败',
                    icon: 'none',
                    duration: 1000,
                    mask: true
                  })
                }
              })
            }
          }
        })
      }
    })
  },

Pay.php

<?php
    include 'WeixinPay.php';  
    $appid='';  //小程序appid
    $openid= $_GET['openid'];  
    $mch_id='';  //商户id
    $key='';  //商户key
    $out_trade_no = $mch_id. time();  
    $total_fee = $_GET['total_fee'];  
    $body= $_GET['body'];
    if(empty($total_fee)){ 
        $body = $body;  
        $total_fee = floatval(99*100);  
    }else{  
        $body = $body;  
        $total_fee = floatval($total_fee*100);  
    }  
    $weixinpay = new 	WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee);  
    $return=$weixinpay->pay();  
    echo json_encode($return);  

WeixinPay.php

<?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' => '2015450806125348', //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' => 'http://www.weixin.qq.com/wxpay/pay.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);
        $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) {
        $xml = "<root>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</root>";
        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);
        return $parameters;
    }


    //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;
    }
}