public function onUnSubscribe(Conn $conn, $topic)
    {
        $topic->broadcast($conn->resourceId . " has left " . $topic->getId());
    }
public function onUnSubscribe(Conn $conn, $topic)
    {
        $topic->broadcast($conn->resourceId . " has left " . $topic->getId());
    }
public function onUnSubscribe ( Conn $ conn , $ topic ) { $ topic -> broadcast ( $ conn -> resourceId . " has left " . $ topic -> getId ( ) ) ; }
This will receive any UnSubscription requests for this exact topic.

@param \Ratchet\ConnectionInterface $conn
@param $topic
@return mixed|void
This will receive any UnSubscription requests for this exact topic .