Nathanmac\Utilities\Parser\Parser::only PHP Метод

    public function only($keys)
    {
        $keys = is_array($keys) ? $keys : func_get_args();
        $results = [];
        foreach ($keys as $key) {
            $results = array_merge_recursive($results, $this->buildArray(explode('.', $key), $this->get($key)));
        }
        return $results;
    }