Demo tcp server on PHP.

reactphp_socket_demo.php

<?php

// Composer install this package.
// https://github.com/reactphp/socket

// Command support: broadcast, who

require 'vendor/autoload.php';

$loop = React\EventLoop\Factory::create();

$socket = new React\Socket\Server($loop);

$connections = [];

$socket->on('connection', function ($conn) use (&$connections) {

    $conn->name = stream_socket_get_name($conn->stream, true);
    $connections[] = $conn;


    $conn->write("Hello there!\n");
    $conn->write("Your connection is ".$conn->name."\n");

    $conn->on('data', function ($data) use ($conn, &$connections) {
        $data = trim($data);
        if (strpos($data, "broadcast") === 0) {
            foreach($connections as $c) {
                if ($conn->name != $c->name) {
                    $c->write($conn->name . " want to send broadcast to you.\n");
                }
            }
            return;
        }

        if ($data == "who") {
            $conn->write("Clients: \n");
            foreach($connections as $c) {
                $conn->write("-> ".$c->name);
                if ($conn->name == $c->name) {
                    $conn->write(" (This is you.)");
                }
                $conn->write("\n");
            }
            $conn->write("Broadcasted!\n");
            return;
        }

        $conn->write("Received!\n");
    });
    $conn->on('close', function ($data) use ($conn, &$connections) {
        foreach($connections as $k => $c) {
            if ($conn->name == $c->name) {
                unset($connections[$k]);
            }
        }
    });

});
$socket->listen(1337);

$loop->run();