1、安装GatewayWorker(只包含内核)，由于官网的demo有时候是低版本，因此手动安装最新版

composer require workerman/gateway-worker

2、根据官网的demo修改composer文件同时补全文件

composer文件

{
    "name"  : "demo/demo",
    "keywords": ["demo"],
    "homepage": "http://www.workerman.net",
    "license" : "demo",
    "require": {
        "workerman/gateway-worker": "^4.0"
    },
    "autoload": {
        "psr-4": {
            "" : "./Applications/demo/"
        }
    }
}

新增根目录start.php文件

<?php
/**
 * run with command
 * php start.php start
 */
ini_set('display_errors', 'on');
use Workerman\Worker;

if(strpos(strtolower(PHP_OS), 'win') === 0)
{
    exit("start.php not support windows, please use start_for_win.bat\n");
} // 检查扩展
if(!extension_loaded('pcntl'))
{
    exit("Please install pcntl extension. See http://doc3.workerman.net/appendices/install-extension.html\n");
}

if(!extension_loaded('posix'))
{
    exit("Please install posix extension. See http://doc3.workerman.net/appendices/install-extension.html\n");
}

// 标记是全局启动
define('GLOBAL_START', 1);

require_once __DIR__ . '/vendor/autoload.php';

// 加载所有Applications/*/start.php，以便启动所有服务
foreach(glob(__DIR__.'/Applications/*/start*.php') as $start_file)
{
    require_once $start_file;
}
// 运行所有服务
Worker::runAll(); 

新增 Applications/demo/Events.php

<?php
//declare(ticks=1);
use \GatewayWorker\Lib\Gateway;

class Events
{
    /**
     * @param int $client_id 连接id
     */
    public static function onConnect($client_id)
    {
        // 向当前client_id发送数据 
        Gateway::sendToClient($client_id, "Hello $client_id\r\n");
        // 向所有人发送
        Gateway::sendToAll("$client_id login\r\n");
    }
    
    /**
     * 当客户端发来消息时触发
     * @param int $client_id 连接id
     * @param mixed $message 具体消息
     */
    public static function onMessage($client_id, $message)
    {
        // 向所有人发送 
        Gateway::sendToAll("$client_id said $message\r\n");
    }
   
    /**
     * 当用户断开连接时触发
     * @param int $client_id 连接id
     */
    public static function onClose($client_id)
    {
        // 向所有人发送 
        GateWay::sendToAll("$client_id logout\r\n");
    }
}

新增 Applications/demo/start_businessworker.php【修复：Waring: Events::onMessage is not callable，与官网demo文件有差异】

<?php 
/**
 * This file is part of workerman.
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the MIT-LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @author walkor<walkor@workerman.net>
 * @copyright walkor<walkor@workerman.net>
 * @link http://www.workerman.net/
 * @license http://www.opensource.org/licenses/mit-license.php MIT License
 */
use \Workerman\Worker;
use \Workerman\WebServer;
use \GatewayWorker\Gateway;
use \GatewayWorker\BusinessWorker;
use \Workerman\Autoloader;

// 自动加载类
require_once __DIR__ . '/../../vendor/autoload.php';
require_once __DIR__ . '/Events.php';

// bussinessWorker 进程
$worker = new BusinessWorker();
// worker名称
$worker->name = 'YourAppBusinessWorker';
// bussinessWorker进程数量
$worker->count = 4;
// 服务注册地址
$worker->registerAddress = '127.0.0.1:1238';
$worker->eventHandler = Events::class;

// 如果不是在根目录启动，则运行runAll方法
if(!defined('GLOBAL_START'))
{
    Worker::runAll();
}

新增 Applications/demo/start_gateway.php

<?php 
/**
 * This file is part of workerman.
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the MIT-LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @author walkor<walkor@workerman.net>
 * @copyright walkor<walkor@workerman.net>
 * @link http://www.workerman.net/
 * @license http://www.opensource.org/licenses/mit-license.php MIT License
 */
use \Workerman\Worker;
use \Workerman\WebServer;
use \GatewayWorker\Gateway;
use \GatewayWorker\BusinessWorker;
use \Workerman\Autoloader;

// 自动加载类
require_once __DIR__ . '/../../vendor/autoload.php';

// gateway 进程，这里使用Text协议，可以用telnet测试
$gateway = new Gateway("websocket://0.0.0.0:8282");
// gateway名称，status方便查看
$gateway->name = 'YourAppGateway';
// gateway进程数，一般设置2个就足够
$gateway->count = 2;
// 本机ip，分布式部署时使用内网ip
$gateway->lanIp = '127.0.0.1';
// 内部通讯起始端口，假如$gateway->count=2，起始端口为2900
// 则一般会使用2900 2901 2个端口作为内部通讯端口 
$gateway->startPort = 2900;
// 服务注册地址
$gateway->registerAddress = '127.0.0.1:1238';

// 心跳间隔
$gateway->pingInterval = 10;
$gateway->pingNotResponseLimit = 1;
// 心跳数据
$gateway->pingData = '';

/* 
// 当客户端连接上来时，设置连接的onWebSocketConnect，即在websocket握手时的回调
$gateway->onConnect = function($connection)
{
    $connection->onWebSocketConnect = function($connection , $http_header)
    {
        // 可以在这里判断连接来源是否合法，不合法就关掉连接
        // $_SERVER['HTTP_ORIGIN']标识来自哪个站点的页面发起的websocket链接
        if($_SERVER['HTTP_ORIGIN'] != 'http://kedou.workerman.net')
        {
            $connection->close();
        }
        // onWebSocketConnect 里面$_GET $_SERVER是可用的
        // var_dump($_GET, $_SERVER);
    };
}; 
*/

// 如果不是在根目录启动，则运行runAll方法
if(!defined('GLOBAL_START'))
{
    Worker::runAll();
}

新增 Applications/demo/start_register.php

<?php 
/**
 * This file is part of workerman.
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the MIT-LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @author walkor<walkor@workerman.net>
 * @copyright walkor<walkor@workerman.net>
 * @link http://www.workerman.net/
 * @license http://www.opensource.org/licenses/mit-license.php MIT License
 */
use \Workerman\Worker;
use \GatewayWorker\Register;

// 自动加载类
require_once __DIR__ . '/../../vendor/autoload.php';

// register 必须是text协议，切记不能将register端口开放给外网
$register = new Register('text://127.0.0.1:1238');

// 如果不是在根目录启动，则运行runAll方法
if(!defined('GLOBAL_START'))
{
    Worker::runAll();
}

优化：https://www.workerman.net/doc/gateway-worker/getting-started.html