N98\Magento\Application::getConfig PHP Method

    public function getConfig($key = null)
    {
        $array = $this->config->getConfig();
        $keys = func_get_args();
        foreach ($keys as $key) {
            if (null === $key) {
                continue;
            }
            if (!isset($array[$key])) {
                return null;
            }
            $array = $array[$key];
        }
        return $array;
    }