static public function extractPagerOptions($data)
    {
        $options = [];
        if (is_array($data)) foreach ($data as $k=>$v) {
            if (in_array($k, ['show_style', 'show_pages', 'prev_title', 'next_title'])) {
                $options[$k] = $v;
            }
        }
        return $options;
    }