Folder::getFolderIdsForSite

static function getFolderIdsForSite(int $siteId, array $additionalFilter = []): array
{
	$return = [];
	$additionalFilter['SITE_ID'] = $siteId;

	$res = self::getList([
		'select' => [
			'ID'
		],
		'filter' => $additionalFilter
	]);
	while ($row = $res->fetch())
	{
		$return[] = $row['ID'];
	}

	return $return;
}