微信小程序支付PHP代码

<?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);
  }
 }

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
     })
    }
    })
   }
   }
  })
  }
 })
 },

<?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); 

<?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;
 }
}