Implementing a WebSocket client

To implement a WebSocket client, we're going to use another PHP library called ratchet/pawl:

$ composer require ratchet/pawl 0.2.2

The client will read input from php://stdin and send it via WebSocket to the server. It'll also watch for any incoming messages and print them to the console:

// GameClient.php 
use function Ratchet\Client\connect; 
 
class GameClient extends Command { 
  protected function configure() { 
    $this->setName('chat-client'); 
    $this->addArgument('port', InputArgument::REQUIRED); 
    $this->addArgument('address', InputArgument::OPTIONAL, 
      '', '127.0.0.1'); 
  } 
 
  protected function execute($input, $output) { 
    $port = $input->getArgument('port'); 
    $address = $input->getArgument('address'); 
 
    $stdin = fopen('php://stdin', 'r'); 
    $loop = new StreamSelectLoop(); 
 
    connect('ws://' . $address . ':'...