gistfile1.php

<?php

$i = 0;

$app = function ($request, $response) use (&$i) {

    $request->on('end', function() use ($response, &$i) {
        $i++;

        $text = "This is request number $i.\n";
        $headers = array('Content-Type' => 'text/plain');

        $response->writeHead(200, $headers);
        $response->end($text);
    });
};

$loop = React\EventLoop\Factory::create();
$socket = new React\Socket\Server($loop);
$http = new React\Http\Server($socket);

$http->on('request', $app);

$socket->listen(1337);
$loop->run();