小程序与php 实现微信支付

小程序访问地址：

payfee.php:

include "WeixinPay.php";
$appid="";
$openid= $_GET["id"];
$mch_id="";
$key="";
$out_trade_no = $mch_id. time();
$total_fee = $_GET["fee"];
if(empty($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);

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;
    }


}

小程序页面处理：

wx.request({
url:"https://www.yourhost.com/weixin/WeiActivity/payfee.php",//改成你自己的链接
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("fail");
},
"complete":function(res){
console.log("complete");
}
});
},
fail:function(res){
console.log(res.data)
}
});

回调url:notify.php

$postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信参数
if (empty($postXml)) {
    return false;
}

//将xml格式转换成数组
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;
}

$attr = xmlToArray($postXml);

$total_fee = $attr[total_fee];
$open_id = $attr[openid];
$out_trade_no = $attr[out_trade_no];
$time = $attr[time_end];

以上几步你就可以完成小程序的微信支付与php完美的结合起来