Eccube\Controller\Install\InstallController::isValid PHP Метод

    private function isValid(Request $request, Form $form)
    {
        $session = $request->getSession();
        if ('POST' === $request->getMethod()) {
            $form->handleRequest($request);
            if ($form->isValid()) {
                $sessionData = $session->get(self::SESSION_KEY) ?: array();
                $formData = array_replace_recursive($sessionData, $form->getData());
                $session->set(self::SESSION_KEY, $formData);
                return true;
            }
        }
        return false;
    }