Matthias\SymfonyConsoleForm\Console\Helper\Question\AlwaysReturnKeyOfChoiceQuestion::assertFlatChoiceViewsArray PHP Метод

    private function assertFlatChoiceViewsArray(array $choiceViews)
    {
        foreach ($choiceViews as $choiceView) {
            if (!$choiceView instanceof ChoiceView) {
                throw new \InvalidArgumentException('Only a flat choice hierarchy is supported');
            }
        }
    }