微信小程序支付后台处理逻辑（转）

<?php
namespace app\parent\controller;

use think\Request;

class Wxpay
{
function wechat(){ //微信配置信息和初始逻辑

$openid =Request::instance()->param('openid');

$out_trade_no =Request::instance()->param('out_trade_no');

$total_fee       =Request::instance()->param('total_fee');

       $appid           = "*******";

$body = mb_convert_encoding("订单详情","utf-8","gbk"); //商品描述

$mch_id = "*******"; //商户号

$nonce_str = $this->getNonceStr(); //随机字符

$notify_url = *******'; //回调地址

$openid = $openid;/*"o-E0L0X-hr-kXdHVrLwjzxF--sE4";*/ //openid

$out_trade_no = $out_trade_no; //商户订单编号

$ip = request()->ip(); //ip

$total_fee       = $total_fee; //支付金额分

       $key            = "*******";

$param = $this->signature($appid,$body,$mch_id,$nonce_str,$notify_url,$openid,$out_trade_no,$ip,$total_fee,$key);

//发起请求
       $xml            = $this->post_curl("https://api.mch.weixin.qq.com/pay/unifiedorder",$param); //发起请求
       //数据结果解析
       $info            = json_decode(json_encode(simplexml_load_string($xml,'SimpleXMLElement',LIBXML_NOCDATA)),true);

$prepay_id       = $info['prepay_id'];

       $noncestr        = $info['nonce_str'];

$timestamp = time();

$SignA = strtoupper(md5("appid=$appid&noncestr=$noncestr&package=Sign=WXPay&partnerid=$mch_id&prepayid=$prepay_id&timestamp=$timestamp&key=$key"));

       $info['sign']   = $SignA;

       $info['timestamp'] = $timestamp;

return json_decode($info);
}

private function signature($appid,$body,$mch_id,$nonce_str,$notify_url,$openid,$out_trade_no,$ip,$total_fee,$key){ //清新支付请求数据组装
       $stringA = "appid=$appid&body=$body&mch_id=$mch_id&nonce_str=$nonce_str&notify_url=$notify_url&openid=$openid&out_trade_no=$out_trade_no&spbill_create_ip=$ip&total_fee=$total_fee&trade_type=JSAPI";
       $stringSignTemp = $stringA."&key=$key";
       $sign = strtoupper(md5($stringSignTemp));
       $param = "<xml>\n";
        $param .= "<appid>{$appid}</appid>\n";
        $param .= "<body>{$body}</body>\n";
        $param .= "<mch_id>{$mch_id}</mch_id>\n";
        $param .= "<nonce_str>{$nonce_str}</nonce_str>\n";
        $param .= "<notify_url>{$notify_url}</notify_url>\n";
        $param .= "<openid>{$openid}</openid>\n";
        $param .= "<out_trade_no>{$out_trade_no}</out_trade_no>\n";
        $param .= "<spbill_create_ip>{$ip}</spbill_create_ip>\n";
        $param .= "<total_fee>{$total_fee}</total_fee>\n";
        $param .= "<trade_type>JSAPI</trade_type>\n";
        $param .= "<sign>{$sign}</sign>\n";
        $param .= "</xml>";
       return $param;
   }

/**
   * 产生随机字符串，不长于32位
   * @param int $length
   * @return 产生的随机字符串
   */
   private function getNonceStr($length = 32)
   {
       $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
       $str ="";
       for ( $i = 0; $i < $length; $i++ ) {
           $str .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
       }
       return $str;
   }

private function post_curl($url,$data,$agreement = 0){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        if($agreement == 0){//0 https   1   http
            unset($_REQUEST['agreement']);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        }
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS,$data);
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
        curl_setopt($ch, CURLOPT_TIMEOUT, 15);
        $result = curl_exec($ch);
        curl_close($ch);
        return $result;
    }
}

转载自：https://blog.csdn.net/qq_34629975/article/details/72420411

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