example-react-http-server.php

<?php
// composer require react/react:\*

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

use React\EventLoop\Factory;
use React\Socket\Server as SocketServer;
use React\Http\Server as HttpServer;
use React\Http\Request;
use React\Http\Response;

$loop = Factory::create();
$socket = new SocketServer($loop);
$http = new HttpServer($socket);
$http->on('request', function (Request $request, Response $response) {
    $response->writeHead();
    $response->end('hello');
});

$socket->listen(8888, '0.0.0.0');
$loop->run();