微信小程序支付PHP代码

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)
     }
    }
   })
  }
 }

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
   })
 })
}

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(); 
  echo json_encode($return); 

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) {
    $xml = "";
    foreach ($arr as $key => $val) {
      if (is_array($val)) {
        $xml .= "<" . $key . ">" . arrayToXml($val) . "";
      } else {
        $xml .= "<" . $key . ">" . $val . "";
      }
    }
    $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);
    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;
  }
}