chat.php

    public function __construct()
    {
        $this->clients = new \SplObjectStorage;
        $this->connectedUsers = [];
        $this->connectedIDs = [];
        $this->IDs = 0;
    }
    
    public function onOpen(ConnectionInterface $conn)
    {
        // Store the new connection to send messages to later
        $this->clients->attach($conn);
        $this->connectedUsers [$conn->resourceId] = $conn;
        $this->connectedIDs[++$this->IDs] = $conn->resourceId; // а откуда мы берём owner ?
        
        echo "New connection! ({$conn->resourceId})\n";
        $conn->send(json_encode({'owner': $this->IDs, 'status': connected}));
    }