微信小程序发送订阅消息（之前是模板消息）

之前的模板消息已经废弃，现在改为订阅消息，订阅消息发布前，需要用户确认后才能接收订阅消息。

小程序端

index.wxml

<button bindtap="send">发送订阅消息</button>

index.js

const app = getApp()
Page({
  data: {
  }，

send:function(){
    wx.requestSubscribeMessage({  
      tmplIds: ['WZiCliW1zVtHXqX7dGnFNmFvxhW-wd9S_W4WfrwNvss'],  
      success:(res)=> {
        wx.request({
          url: 'https://www.xxx.com/send.php',
          data: {
            openid:'要推送的openid',
            template_id:'要使用的template_id',
          },
          header: {
            'content-type': 'application/json'
          },
          success (res) {
            if(res.data.errcode == '43101'){
              console.log("拒绝订阅消息")
            }else if(res.data.errcode == '0'){
              console.log("发送订阅消息")
            }else{
              console.log("未知错误")
            }
          }
        })
      }
    })
  }
)}

后端

send.php

<?php
//设置 header 
header("Content-type:application/json");

//接收参数
$template_id = $_GET["template_id"];
$openid = $_GET["openid"];

//初始化 CURL
$ch = curl_init();

// 获取access_token
// include '';
require_once("access_token.php");

//目标服务器地址 
curl_setopt($ch, CURLOPT_URL, 'https://api.weixin.qq.com/cgi-bin/message/subscribe/send?access_token='.$access_token);

//设置要POST的数据
curl_setopt($ch, CURLOPT_POST, true);
$data = '{
  "touser": $openid,
  "template_id": $template_id,
  "page": "pages/index/index",// 要跳转的页面
  "miniprogram_state":"developer",
  "lang":"zh_CN",
  "data": {
      "thing4": {
          "value": "欢迎使用专插本最前线小程序"
      },
      "thing5": {
          "value": "小程序由公众号：广东专插本最前线开发"
      }
  }
}';
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");

// 对认证证书来源的检查
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
// 从证书中检查SSL加密算法是否存在
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);

//获取的信息以文件流的形式返回，而不是直接输出
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

//发起请求
$result = curl_exec($ch);
echo $result;

//关闭请求
curl_close($ch);
?>

access_token.php

<?php
// 声明页面header
header("Content-type:charset=utf-8");

// APPID、APPSECRET
$appid = "你的小程序APPID";
$appsecret = "你的小程序APPSECRET";

// 获取access_token和jsapi_ticket
function getToken(){
    $file = file_get_contents("access_token.json",true);//读取access_token.json里面的数据
    $result = json_decode($file,true);

//判断access_token是否在有效期内，如果在有效期则获取缓存的access_token
//如果过期了则请求接口生成新的access_token并且缓存access_token.json
if (time() > $result['expires']){
        $data = array();
        $data['access_token'] = getNewToken();
        $data['expires'] = time()+7000;
        $jsonStr =  json_encode($data);
        $fp = fopen("access_token.json", "w");
        fwrite($fp, $jsonStr);
        fclose($fp);
        return $data['access_token'];
    }else{
        return $result['access_token'];
    }
}
 
//获取新的access_token
function getNewToken($appid,$appsecret){
    global $appid;
    global $appsecret;
    $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appid."&secret=".$appsecret."";
    $access_token_Arr =  file_get_contents($url);
    $token_jsonarr = json_decode($access_token_Arr, true);
    return $token_jsonarr["access_token"];
}

$access_token = getToken();
?>

逻辑

1、通过button控件出发send函数
2、send函数调用wx.requestSubscribeMessageAPI，微信允许接收订阅消息
3、wx.request向send.php后端请求
4、后端获取access_token后，调用订阅消息接口POST一段json数据即可发送订阅消息

官方文档

https://developers.weixin.qq.com/miniprogram/dev/api/open-api/subscribe-message/wx.requestSubscribeMessage.html

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/subscribe-message/subscribeMessage.addTemplate.html

Author:TANKING
Date:2020-08-24
Web:http://www.likeyun.cn/
WeChat:face6009