Kraken\Channel\Channel::send PHP Method

    public function send($name, $message, $flags = Channel::MODE_DEFAULT, callable $success = null, callable $failure = null, callable $cancel = null, $timeout = 0.0)
    {
        if ($success !== null || $failure !== null || $cancel !== null) {
            return $this->sendRequest($name, $message, $flags, $success, $failure, $cancel, $timeout);
        }
        return $this->sendAsync($name, $message, $flags);
    }