CListElementField::Add

public function Add($iblock_id, $arFields)
{
	/** @global CStackCacheManager $stackCacheManager */
	global $stackCacheManager;
	if($iblock_id > 0)
	{
		$arIBlockFields = CIBlock::GetArrayByID($iblock_id, "FIELDS");
		$arIBlockFields[$arFields["TYPE"]] = $arFields;
		CIBlock::SetFields($iblock_id, $arIBlockFields);
		$stackCacheManager->Clear("b_iblock");
	}
	return new CListElementField($iblock_id, $arFields["TYPE"], $arFields["NAME"], $arFields["SORT"]);
}