Code sharing for developing WeChat red envelope function using PHP

This article mainly introduces the implementation method of WeChat red envelopes in PHP WeChat public account development. It analyzes the implementation ideas, steps and specific operation skills of PHP to implement the red envelope sending function of WeChat public accounts in the form of examples. Friends in need can refer to it. I hope Can help everyone.

1. Requirements:

Fans click on their company’s order on the customer’s public platform, and then give the order a cashback of five yuan. Send it to the WeChat ID of the order.

2. Development ideas:

#1: First get the openid of following this fan. Openid is the WeChat ID of following a certain public account. , so that this person can be located as the operator of the order.

2: Send xml data to request WeChat server.

The code has two php files

1.oauth2.php

<?php
$code=$_GET[&#39;code&#39;];
$state=$_GET[&#39;state&#39;];
$appid=&#39;XXXX&#39;;
$appsecret=&#39;XXXXXXXX&#39;;//
if (empty($code)) $this->error(&#39;授权失败&#39;);
$token_url=&#39;https://api.weixin.qq.com/sns/oauth2/access_token?appid=&#39;.$appid&#39;&secret=&#39;.$appsecret.&#39;&code=&#39;.$code.&#39;&grant_type=authorization_code&#39;;
$token=json_decode(file_get_contents($token_url));
if (isset($token->errcode)) {
echo &#39;<h1 id="错误">错误1</h1>&#39;.$token->errcode;
echo &#39;<br/><h2 id="错误信息">错误信息1：</h2>&#39;.$token->errmsg;
exit;
}
session_start();
$_SESSION[&#39;openid&#39;]= $token->openid;
header(&#39;location:http://www.XXXXXXX.com/XXXXX/XXXXXX/XXXXXX/hongbao.php&#39;);//要跳转的文件路径
?>

2.hongbao.php

<?php
//XXXXX。。是需要开发者自己填写的内容，注意不要泄密
 // 从session中获取到openid；
$openid=$_SESSION["openid"];
    if(empty($openid))
    {
header(&#39;location:https://open.weixin.qq.com/connect/oauth2/authorize?appid=XXXXXXXX&redirect_uri=http://www.XXXXXXX.com/oauth2.php&respose_type=code&scope=snsapi_base&state=XXXX&connect_redirect=1#wechat_redirect&#39;);
    }
}
// 关键的函数
public function weixin_red_packet(){
  // 请求参数
  // 随机字符串
  $data[&#39;nonce_str&#39;]=$this->get_unique_value();
  //商户号，输入你的商户号
  $data[&#39;mch_id&#39;]="XXXXXXX";
  //商户订单号，可以按要求自己组合28位的商户订单号
  $data[&#39;mch_billno&#39;]=$data[&#39;mch_id&#39;].date("ymd")."XXXXXX".rand(1000,9999);
  //公众帐号appid，输入自己的公众号appid
  $data[&#39;wxappid&#39;]="XXXXXXX";
  //商户名称
  $data[&#39;send_name&#39;]="XXXXX";
  //用户openid,输入待发红包的用户openid
  session_start();
  $data[&#39;re_openid&#39;]=$_SESSION["openid"];
  //付款金额
  $data[&#39;total_amount&#39;]="XXXX";
  //红包发放总人数
  $data[&#39;total_num&#39;]="XXXX";
  //红包祝福语
  $data[&#39;wishing&#39;]="XXXX";
  //IP地址
  $data[&#39;client_ip&#39;]=$_SERVER[&#39;LOCAL_ADDR&#39;];
  //活动名称
  $data[&#39;act_name&#39;]="XXXXX";
  //备注
  $data[&#39;remark&#39;]="XXXXX";
  // 生成签名
  //对数据数组进行处理
  //API密钥,输入自己的K 微信商户号里面的K
  $appsecret="XXXXXXXXXXXXXX"; //
  $data=array_filter($data);
  ksort($data);
  $str="";
  foreach($data as $k=>$v){
    $str.=$k."=".$v."&";
  }
  $str.="key=".$appsecret;
  $data[&#39;sign&#39;]=strtoupper(MD5($str));
  /*
    发红包操作过程：
      1.将请求数据转换成xml
      2.发送请求
      3.将请求结果转换为数组
      4.将请求信息和请求结果录入到数据库中
      4.判断是否通信成功
      5.判断是否转账成功
   */
  //发红包接口地址
  $url="https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";
  //将请求数据由数组转换成xml
  $xml=$this->arraytoxml($data);
  //进行请求操作
  $res=$this->curl($xml,$url);
  //将请求结果由xml转换成数组
  $arr=$this->xmltoarray($res);
}
// 生成32位唯一随机字符串
private function get_unique_value(){
  $str=uniqid(mt_rand(),1);
  $str=sha1($str);
  return md5($str);
}
// 将数组转换成xml
private function arraytoxml($arr){
  $xml="<xml>";
  foreach($arr as $k=>$v){
    $xml.="<".$k.">".$v."</".$k.">";
  }
  $xml.="</xml>";
  return $xml;
}
// 将xml转换成数组
private function xmltoarray($xml){
  //禁止引用外部xml实体
  libxml_disable_entity_loader(true);
  $xmlstring=simplexml_load_string($xml,"SimpleXMLElement",LIBXML_NOCDATA);
  $arr=json_decode(json_encode($xmlstring),true);
  return $arr;
}
//进行curl操作
private function curl($param="",$url) {
  $postUrl = $url;
  $curlPost = $param;
  //初始化curl
  $ch = curl_init();
  //抓取指定网页
  curl_setopt($ch, CURLOPT_URL,$postUrl);
  //设置header
  curl_setopt($ch, CURLOPT_HEADER, 0);
  //要求结果为字符串且输出到屏幕上
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  //post提交方式
  curl_setopt($ch, CURLOPT_POST, 1);
  // 增加 HTTP Header（头）里的字段
  curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);
  // 终止从服务端进行验证
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
  //证书放到网站根目录的cert文件夹底下
  curl_setopt($ch,CURLOPT_SSLCERT,dirname(__FILE__).DIRECTORY_SEPARATOR.
        &#39;cert&#39;.DIRECTORY_SEPARATOR.&#39;apiclient_cert.pem&#39;);
    curl_setopt($ch,CURLOPT_SSLKEY,dirname(__FILE__).DIRECTORY_SEPARATOR.
        &#39;cert&#39;.DIRECTORY_SEPARATOR.&#39;apiient_key.pem&#39;);
    curl_setopt($ch,CURLOPT_CAINFO,dirname(__FILE__).DIRECTORY_SEPARATOR.
        &#39;cert&#39;.DIRECTORY_SEPARATOR.&#39;rootca.pem&#39;);
  //运行curl
  $data = curl_exec($ch);
  //关闭curl
  curl_close($ch);
  return $data;
}
?>

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