<?php
namespace app\index\controller;

class Pay {
  
    public function notice(){
        //websocket  $server
    }
} 

swoole can use $server- > push () ;

but how to solve this problem when you can"t get $server when you want to push messages to the client on the server?

is it necessary to use swoole websocket_client to connect websocket_server ;
use client to server send data before server wants to push to the client?