CIBlockRights::GetGroups

function GetGroups($arOperations = false, $opMode = false)
{
	$arResult = array();

	$arRights = $this->GetRights(array("operations" => $arOperations, "operations_mode" => $opMode));
	foreach($arRights as $arRight)
		$arResult[$arRight["GROUP_CODE"]] = $arRight["GROUP_CODE"];

	return $arResult;
}