How to update the File multiple property of an element in Bitrix?

Question

1C-Bitrix

$el = new CIBlockElement;
$arLoadProductArray = Array(
    "PROPERTY_VALUES"=> array(
        "PHOTOS" => array(
            ($_FILES["PHOTO_1"]["size"] == 0) ? CFile::MakeFileArray($arCard["PROPS"]["PHOTOS"]["VALUE"][0]) : $_FILES["PHOTO_1"],
            ($_FILES["PHOTO_2"]["size"] == 0) ? CFile::MakeFileArray($arCard["PROPS"]["PHOTOS"]["VALUE"][1]) : $_FILES["PHOTO_2"]
        )
    )
);
$res = $el->Update($arCard["FIELDS"]["ID"], $arLoadProductArray);

Thus, the files are only added to the existing ones, but how can they be overwritten or even clear the property?

Answer 1

Firstly, see how to work with a multiple property of the "File" type here: https://dev.1c-bitrix.ru/learning/course/index.php...
Secondly, I will add from myself that not specified in the documentation: to add a new file without deleting the old ones, use the CIBlockElement::SetPropertyValueCode method, not CIBlockElement::SetPropertyValuesEx