elseif ($id_category = self::getValue('id_category'))
{
    $row = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
    SELECT `name`, `meta_title`, `meta_description`, `meta_keywords`, `description`
    FROM `'._DB_PREFIX_.'category_lang`
    WHERE id_lang = '.(int)($id_lang).' AND id_category = '.(int)($id_category));
    if ($row)
    {
        if (empty($row['meta_description']))
            $row['meta_description'] = strip_tags($row['description']);
        return self::completeMetaTags($row, $row['name']);
    }
}

elseif ($id_category = self::getValue('id_category'))
{
    if (!empty($title))
        $title = ' - '.$title;
    $page_number = (int)self::getValue('p');
    $row = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
    SELECT `name`, `meta_title`, `meta_description`, `meta_keywords`, `description`
    FROM `'._DB_PREFIX_.'category_lang`
    WHERE id_lang = '.(int)$id_lang.' AND id_category = '.(int)$id_category);
    if ($row)
    {
        if (empty($row['meta_description']))
            $row['meta_description'] = strip_tags($row['description']);

        // Paginate title
        if (!empty($row['meta_title']))
            $row['meta_title'] = $title.$row['meta_title'].(!empty($page_number) ? ' ('.$page_number.')' : '').' - '.Configuration::get('PS_SHOP_NAME');
        else
            $row['meta_title'] = $row['name'].(!empty($page_number) ? ' ('.$page_number.')' : '').' - '.Configuration::get('PS_SHOP_NAME');

        if (!empty($title))
            $row['meta_title'] = $title.(!empty($page_number) ? ' ('.$page_number.')' : '').' - '.Configuration::get('PS_SHOP_NAME');

        return self::completeMetaTags($row, $row['name']);
    }
}