如何使用PHP实现微信小程序中的即时通讯功能

//消息发送
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api.weixin.qq.com/cgi-bin/message/custom/send? 
access_token='.$access_token);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
$resp = curl_exec($ch);
curl_close($ch);

//消息接收
$url = 'https://api.weixin.qq.com/wxa/business/getliveinfo'; 
$ch = curl_init($url);
$options = array(
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => array('Content-type: application/json'),
    CURLOPT_POSTFIELDS => json_encode($data)
);
curl_setopt_array($ch, $options);
$results = curl_exec($ch);
curl_close($ch);

// 引入SDK
const cloud = require('wx-server-sdk')

// 获取云函数中的环境ID
const env = cloud.getWXContext().ENV

exports.main = async (event, context) => {
  // 初始化
  cloud.init({ env })

  // 调用云函数发送消息
  let result = await cloud.callFunction({
    name: 'sendMsg', // 云函数的文件名
    data: {
      openid: event.openid, // 发送用户的openid
      content: event.content // 发送的消息内容
    }
  })

  // 响应结果
  return result
}