CWebDavIblock::_ib_elm_update

function _ib_elm_update($id, $arFields, $workflow=false)
{
	global $APPLICATION;
	global $USER_FIELD_MANAGER;

	if (is_string($workflow))
		$workflow = ($workflow == 'workflow');

	$id = intval($id);
	if ($id <= 0)
		return false;

	$bUF = (isset($arFields['USER_FIELDS']));
	if ($bUF)
	{
		$UF_ENTITY = $this->GetUfEntity();

		if ( ! $USER_FIELD_MANAGER->CheckFields($UF_ENTITY, $id, $arFields['USER_FIELDS']))
		{
			if(is_object($APPLICATION) && $APPLICATION->GetException())
			{
				$e = $APPLICATION->GetException();
				$this->LAST_ERROR .= $e->GetString();
				return false;
			}
		}
	}

	$el = new CIBlockElement;

	if ($workflow)
	{
		if ($bUF)
			$handlerID = AddEventHandler('search', 'BeforeIndex', array($this, 'IndexUfValues'));

		$result = $el->Update($id, $arFields, $workflow);

		if ($bUF)
			RemoveEventHandler('search', 'BeforeIndex', $handlerID);

		if(!$result)
		{
			$this->LAST_ERROR = $el->LAST_ERROR;
			return false;
		}
		else
		{
			if (isset($arFields['USER_FIELDS']))
			{
				$USER_FIELD_MANAGER->Update($UF_ENTITY, $id, $arFields['USER_FIELDS']);
			}
		}
	}
	else
	{
		$arFields['WF_STATUS_ID'] = 1;
		$arProperties = (isset($arFields['PROPERTY_VALUES']) ? $arFields['PROPERTY_VALUES'] : false);
		unset($arFields['PROPERTY_VALUES']);

		if ($bUF)
			$handlerID = AddEventHandler('search', 'BeforeIndex', array($this, 'IndexUfValues'));

		if ($arProperties !== false)
		{
			if(
				isset($this->arParams['element_array']['ID']) &&
				isset($this->arParams['element_array']['IBLOCK_ID']) &&
				$this->arParams['element_array']['ID'] == $id
			)
			{
				$iblockId = $this->arParams['element_array']['IBLOCK_ID'];
			}
			else
			{
				$iblockId = $this->IBLOCK_ID;
			}
			foreach ($arProperties as $code => $value)
			{
				if($code === 'FILE')
				{
					$el->SetPropertyValuesEx($id, $iblockId, array($code => $value));
				}
				else
				{
					$el->SetPropertyValues($id, $iblockId, $value, $code);
				}
			}

			if (! $this->ValidatePropertyValues($id, $arProperties, $iblockId)) // as SetPropertyValues doesn't handle SaveFile errors
			{
				$this->LAST_ERROR = GetMessage("WD_FILE_ERROR111");
				return false;
			}
		}

		if (isset($arFields['USER_FIELDS'])
			&& !empty($arFields['USER_FIELDS'])
		)
		{
			$USER_FIELD_MANAGER->Update($UF_ENTITY, $id, $arFields['USER_FIELDS']);
		}

		$result = $el->Update($id, $arFields, $workflow, true);

		if(!$result)
		{
			if ($bUF)
				RemoveEventHandler('search', 'BeforeIndex', $handlerID);

			$this->LAST_ERROR = $el->LAST_ERROR;
			return false;
		}

		if ($bUF)
			RemoveEventHandler('search', 'BeforeIndex', $handlerID);
	}
	$element = CIBlockElement::GetList(array(), array('ID' => $id), false, false,
		array('ID', 'IBLOCK_SECTION_ID', 'IBLOCK_CODE', 'IBLOCK_ID'))->fetch();
	CWebDavDiskDispatcher::sendEventToOwners($element, null, 'update');

	return $result;
}