How to remove all values ​​of a multiple property?

Question

1C-Bitrix

Good people, please tell me how to delete ALL values ​​of a certain multiple property of the file type when changing the properties of an element? I try to clear the values ​​of the morePhotos property, but it doesn't work:

$PROP['type'] = 22;
$PROP['morePhotos'] = ''; // не достаточно, фото не удаляются.
$elUpdate = CIBlockElement::SetPropertyValuesEx($id, false, $PROP);

If, for example, I insert a new photo into morePhotos, then all the old ones are deleted and the new one remains. And to clear the property completely?

Answer 1

It turned out to be more correct:

$arFile["MODULE_ID"] = "iblock";
$arFile["del"] = "Y";
$PROP['morePhotos'][id варианта] = $arFile;