Neos\Flow\Mvc\Controller\AbstractController::addFlashMessage PHP Метод

    public function addFlashMessage($messageBody, $messageTitle = '', $severity = Error\Message::SEVERITY_OK, array $messageArguments = [], $messageCode = null)
    {
        if (!is_string($messageBody)) {
            throw new \InvalidArgumentException('The message body must be of type string, "' . gettype($messageBody) . '" given.', 1243258395);
        }
        switch ($severity) {
            case Error\Message::SEVERITY_NOTICE:
                $message = new Error\Notice($messageBody, $messageCode, $messageArguments, $messageTitle);
                break;
            case Error\Message::SEVERITY_WARNING:
                $message = new Error\Warning($messageBody, $messageCode, $messageArguments, $messageTitle);
                break;
            case Error\Message::SEVERITY_ERROR:
                $message = new Error\Error($messageBody, $messageCode, $messageArguments, $messageTitle);
                break;
            default:
                $message = new Error\Message($messageBody, $messageCode, $messageArguments, $messageTitle);
                break;
        }
        $this->flashMessageContainer->addMessage($message);
    }