[PHP知识库]小程序 TP5.0支付

必须开通微信支付里面的 jsapi业务

开通地址：https://pay.weixin.qq.com/index.php/public/product/detail?pid=30

需要准备：

? ? ? ? $appid='wxde0e470*********'; //小程序 appid
? ? ? ? $openid= $_POST['id'];// 用户openid? 小程序login获得
? ? ? ? $mch_id='160346****'; //微信支付商户支付号
? ? ? ? $key='********************************'; //Api 密钥

-----------------------------------------------------代码开始：-------------------------------------

/application/index/controller/Pay.php? ? 文件

<?php
 
 
namespace app\index\controller;
 
 
//use think\facade\Env;
include  '../extend/wxpay/WeixinPay.php';
//WeixinPay.php 文件我是放extend/wxpay下的，根据实际情况写
 
class Pay
{
    public function index(){
 
        $appid='wxde0e4706a0******'; //小程序 appid
        $openid= $_POST['id'];// 用户openid
        $mch_id='16034*****'; //微信支付商户支付号
        $key='*****************************'; //Api 密钥
        $out_trade_no = $mch_id. time();
        $total_fee = $_POST['fee']; //需要支付的金额 单位分
 
        if (empty($total_fee)) { //押金
            $body = "充值押金";
            $total_fee = floatval(1);
        } 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);
    }
 
    public function notify(){
//        $postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信参数
        $postXml = file_get_contents("php://input"); //接收微信参数
// 接受不到参数可以使用 file_get_contents("php://input"); PHP 高版本中$GLOBALS 好像已经被废弃了
        if (empty($postXml)) {
            db('paytest')->insert(['content'=>"回调失败". $postXml]);
            return false;
        }
 
//将 xml 格式转换成数组
 
        $attr = $this->xmlToArray($postXml);
        $total_fee = $attr['total_fee'];
        $open_id = $attr['openid'];
        $out_trade_no = $attr['out_trade_no'];
        $time = $attr['time_end'];
        // to do  
     
       //这写些支付成功修改订单等等 不列举了
       //
  db('paytest')->insert(['content'=>json_encode($attr)]);
  
     //这里必须写 不然一直回调 我就踩过这里
     echo '<xml> <return_code><![CDATA[SUCCESS]]></return_code> <return_msg><![CDATA[OK]]></return_msg> </xml>';   
     
    }
 
    public 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;
    }
}

/extend/wxpay/WeixinPay.php? ? 文件

<?php
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
        $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;
    }
 
 
 
    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($ch);
            throw new Exception("curl 出错，错误码:$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;
    }
 
 
   
 
    //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' => 'http://miaomu.******.com/index.php/index/pay/notify', //回调通知地址  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;
    }
 
 
    //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;
    }
 
 
}

?小程序代码：

wxml：

<button bindtap='pay'>支付</button>

js：

  pay:function(){
    console.log('点击了支付')
    wx.request({
      url: 'http://miaomu.******.com/index.php/index/pay/index',//改成你自己的链接
      data: {
        id: "oxmfD5HLgCBfYqyfSHBvFY2aH0p4",//用户 openid！！！！！！！！！！！！
        fee: 0.01 //商品价格 一分
      },
      header: {
        'Content-Type': 'application/x-www-form-urlencoded'
      },
      method: 'POST',
      success: function (res) {
        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': 'MD5',
          '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)
      }
    });
  },