public function getSorters()
    {
        $sorters = &gplcart_static('module.file_manager.sorter.list');

        if (isset($sorters)) {
            return $sorters;
        }

        $sorters = (array) gplcart_config_get(__DIR__ . '/../config/sorters.php');
        $this->hook->attach('module.file_manager.sorter.list', $sorters, $this);
        return $sorters;
    }