CIBlockDocument::UpdateDocument

static function UpdateDocument($documentId, $arFields)
{
	$documentId = intval($documentId);
	if ($documentId <= 0)
		throw new CBPArgumentNullException("documentId");

	CIBlockElement::WF_CleanUpHistoryCopies($documentId, 0);

	$arFieldsPropertyValues = array();
	$complexDocumentId = ['iblock', get_called_class(), $documentId];

	$dbResult = CIBlockElement::GetList(
		array(),
		array("ID" => $documentId, "SHOW_NEW" => "Y", "SHOW_HISTORY" => "Y"),
		false, false,
		array("ID", "IBLOCK_ID")
	);
	$arResult = $dbResult->Fetch();
	if (!$arResult)
		throw new Exception("Element is not found");

	$arDocumentFields = self::GetDocumentFields("iblock_".$arResult["IBLOCK_ID"]);

	$arKeys = array_keys($arFields);
	foreach ($arKeys as $key)
	{
		if (!array_key_exists($key, $arDocumentFields))
			continue;

		$arFields[$key] = (is_array($arFields[$key]) && !CBPHelper::IsAssociativeArray($arFields[$key])) ?
			$arFields[$key] : array($arFields[$key]);
		$realKey = ((mb_substr($key, 0, mb_strlen("PROPERTY_")) == "PROPERTY_")?
			mb_substr($key, mb_strlen("PROPERTY_")) : $key);

		if ($arDocumentFields[$key]["Type"] == "user")
		{
			$arFields[$key] = CBPHelper::extractUsers($arFields[$key], $complexDocumentId);
		}
		elseif ($arDocumentFields[$key]["Type"] == "select")
		{
			$arV = array();
			$db = CIBlockProperty::GetPropertyEnum(
				$realKey,
				false,
				array("IBLOCK_ID" => $arResult["IBLOCK_ID"])
			);
			while ($ar = $db->GetNext())
				$arV[$ar["XML_ID"]] = $ar["ID"];

			$listValue = array();
			foreach ($arFields[$key] as &$value)
			{
				if(is_array($value) && CBPHelper::isAssociativeArray($value))
				{
					$listXmlId = array_keys($value);
					foreach($listXmlId as $xmlId)
					{
						$listValue[] = $arV[$xmlId];
					}
				}
				else
				{
					if (array_key_exists($value, $arV))
						$value = $arV[$value];
				}
			}
			if(!empty($listValue))
			{
				$arFields[$key] = $listValue;
			}
		}
		elseif ($arDocumentFields[$key]["Type"] == "file")
		{
			$files = array();
			foreach ($arFields[$key] as $value)
			{
				if (is_array($value))
				{
					foreach($value as $file)
					{
						$makeFileArray = CFile::MakeFileArray($file);
						if($makeFileArray)
							$files[] = $makeFileArray;
					}
				}
				else
				{
					$makeFileArray = CFile::MakeFileArray($value);
					if($makeFileArray)
						$files[] = $makeFileArray;
				}
			}
			if($files)
				$arFields[$key] = $files;
			else
				$arFields[$key] = array(array('del' => 'Y'));
		}
		elseif($arDocumentFields[$key]["Type"] == "S:DiskFile")
		{
			foreach ($arFields[$key] as &$value)
			{
				if(!empty($value))
				{
					$value = "n".$value;
				}
			}
			$arFields[$key] = array("VALUE" => $arFields[$key], "DESCRIPTION" => "workflow");
		}
		elseif ($arDocumentFields[$key]["Type"] == "S:HTML")
		{
			foreach ($arFields[$key] as &$value)
				$value = array("VALUE" => $value);
		}

		unset($value);

		if (!$arDocumentFields[$key]["Multiple"] && is_array($arFields[$key]))
		{
			if (count($arFields[$key]) > 0)
			{
				$a = array_values($arFields[$key]);
				$arFields[$key] = $a[0];
			}
			else
			{
				$arFields[$key] = null;
			}
		}

		if (mb_substr($key, 0, mb_strlen("PROPERTY_")) == "PROPERTY_")
		{
			$realKey = mb_substr($key, mb_strlen("PROPERTY_"));
			$arFieldsPropertyValues[$realKey] = (is_array($arFields[$key]) &&
				!CBPHelper::IsAssociativeArray($arFields[$key])) ? $arFields[$key] : array($arFields[$key]);
			if(empty($arFieldsPropertyValues[$realKey]))
				$arFieldsPropertyValues[$realKey] = array(null);
			unset($arFields[$key]);
		}
	}

	$iblockElement = new CIBlockElement();
	if (!empty($arFieldsPropertyValues))
	{
		$iblockElement->SetPropertyValuesEx($documentId, $arResult["IBLOCK_ID"], $arFieldsPropertyValues);
	}

	$res = $iblockElement->Update($documentId, $arFields, false, true, true);
	if (!$res)
		throw new Exception($iblockElement->LAST_ERROR);
}