<?php
require_once('vendor/autoload.php');

use WebSockets\Common\Event;
use WebSockets\Server\WebSocketServer;

$ws = new WebSocketServer();

$ws->addEventListener(function (Event $e) {

    switch ($e->eventId) {
        case WebSocketServer::EVENT_CONNECTED:
            $e->connection->sendMessage("Welcome!");
            break;

        case WebSocketServer::EVENT_MESSAGE:
            $e->connection->sendMessage(strrev($e->message));
            break;
    }
});

$ws->start();

运行

$ php ws.php

浏览器

var ws = new WebSocket("ws://:8088/socketserver", "hello");
ws.onmessage = function(e) { console.log(e.data); }
ws.send("hello!");

输出

Welcome!
!olleh