How to properly add external php files in Laravel 5

I have a small websockets chat written, the php part is just 2 files, server.php and Chat.php, they are both inside a bin folder and depend on ratchet and some other libraries which I downloaded to the laravel installation via composer.

server.php

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

use Ratchet\Server\IoServer;
use Ratchet\http\HttpServer;
use Ratchet\WebSocket\WsServer;

$server = IoServer::factory(new HttpServer(new WsServer(new Chat)), 8080);

$server->run();

Chat.php

use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;

class Chat implements MessageComponentInterface {

    protected $clients;

    function __construct() {
        $this->clients = new \SplObjectStorage;
    }

    public function onOpen(ConnectionInterface $conn) 
    {
        $this->clients->attach($conn);
    }

    public function onMessage(ConnectionInterface $conn, $msg) 
    {
        foreach ($this->clients as $client) 
        {
            if ($client !== $conn ) {
                $client->send($msg); 
            }
        }
    }

    public function onClose(ConnectionInterface $conn) 
    {
        $this->clients->detach($conn);
    }

    public function onError(ConnectionInterface $conn, \Exception $e) 
    {
        echo 'the following error occured: ' . $e->getMessage();
        $conn->close();
    }

}

Now, I have that bin folder inside the laravel root, and so I am able to start the server since the server.php is looking for dependencies in vendor one level up, but what I wanna do is use all the laravel goodies within these files, especially within Chat.php.

So now for example if I write use DB in Chat.php it gives an error (which I understand, it has no way of knowing laravel), so my question is how do I include this bin folder and its files so that I can use all the laravel goodies within them?

via Chebli Mohamed