Bitrix получить данные всех полей элемента, которые скушает CIBlockElement::Update

getArrayOriginalProperties.php

<?php

/**
 * Получить полный массив свойств элемента валидный для функции CElement Update
 * 
 * @param int $elemId
 * @param int $iblockId
 * @return array
 */
function getArrayOriginalProperties(int $elemId, int $iblockId): array {

    $arSystemProp = [];

    // Получаем стандартные свойства
    $dbIblock = \CIBlockElement::GetList([], [
           'IBLOCK_ID' => $iblockId, 'ID' => $elemId],
          false,
          false,
          ['ID', 'CODE', 'IBLOCK_SECTION_ID', 'NAME', 'XML_ID', 'PREVIEW_TEXT', 'DETAIL_TEXT', 'ACTIVE', 'PREVIEW_PICTURE', 'DETAIL_PICTURE']
    );

    if ($arItemResult = $dbIblock->GetNextElement()) {
        $arItem = $arItemResult->GetFields();
        $arSystemProp['NAME'] = $arItem['NAME'];
        $arSystemProp['ACTIVE'] = $arItem['ACTIVE'];
        $arSystemProp['ID'] = $arItem['ID'];
        $arSystemProp['CODE'] = $arItem['CODE'];
        $arSystemProp['XML_ID'] = $arItem['XML_ID'];
        $arSystemProp['IBLOCK_SECTION_ID'] = !empty($arItem['IBLOCK_SECTION_ID']) ? $arItem['IBLOCK_SECTION_ID'] : 0;

        if (!empty($arItem['DETAIL_PICTURE'])) {
            $arSystemProp['DETAIL_PICTURE'] = \CFile::GetFileArray($arItem['DETAIL_PICTURE']);
        }

        if (!empty($arItem['PREVIEW_PICTURE'])) {
            $arSystemProp['PREVIEW_PICTURE'] = \CFile::GetFileArray($arItem['PREVIEW_PICTURE']);
        }

        if (!empty($arItem['PREVIEW_TEXT'])) {
            $arSystemProp['PREVIEW_TEXT'] = $arItem['PREVIEW_TEXT'];
        }

        if (!empty($arItem['DETAIL_TEXT'])) {
            $arSystemProp['DETAIL_TEXT'] = $arItem['DETAIL_TEXT'];
        }
    }


    // Получаем свойства инфоблока
    $arPropElementTo = [];
    $dbPropertiesElementTo = \CIBlockElement::GetProperty(
          $iblockId,
          $elemId,
          [],
          []
    );

    while ($arNowPropElementTo = $dbPropertiesElementTo->Fetch()) {

        switch ($arNowPropElementTo['PROPERTY_TYPE']) {
            case 'F':
                if (!empty($arNowPropElementTo['VALUE'])) {
                    if ($arNowPropElementTo['MULTIPLE'] === 'Y') {
                        $index = !empty($arPropElementTo[$arNowPropElementTo['CODE']]) ? sizeof($arPropElementTo[$arNowPropElementTo['CODE']]) : 0;
                        $arPropElementTo[$arNowPropElementTo['CODE']]['n' . $index] = [
                            'VALUE' => \CFile::GetFileArray($arNowPropElementTo['VALUE'])
                        ];
                    } else {
                        $arPropElementTo[$arNowPropElementTo['CODE']] = ['VALUE' => \CFile::GetFileArray($arNowPropElementTo['VALUE'])];
                    }
                }
                break;

            case 'E':
                if (!empty($arNowPropElementTo['VALUE'])) {
                    if ($arNowPropElementTo['MULTIPLE'] === 'Y') {
                        $arPropElementTo[$arNowPropElementTo['CODE']][] = $arNowPropElementTo['VALUE'];
                    } else {
                        $arPropElementTo[$arNowPropElementTo['CODE']] = $arNowPropElementTo['VALUE'];
                    }
                }
                break;

            case 'S':
                if ($arNowPropElementTo['MULTIPLE'] === 'Y') {
                    if (!empty($arNowPropElementTo['VALUE']) || !empty($arNowPropElementTo['DESCRIPTION'])) {
                        $arPropElementTo[$arNowPropElementTo['CODE']][] = [
                            'VALUE' => $arNowPropElementTo['VALUE'],
                            'DESCRIPTION' => $arNowPropElementTo['DESCRIPTION']
                        ];
                    }
                } else {
                    if (!empty($arNowPropElementTo['VALUE']) || !empty($arNowPropElementTo['DESCRIPTION'])) { {
                            $arPropElementTo[$arNowPropElementTo['CODE']] = [
                                'VALUE' => $arNowPropElementTo['VALUE'],
                                'DESCRIPTION' => $arNowPropElementTo['DESCRIPTION']
                            ];
                        }
                    }
                }
                break;

            case 'L':
                if (!empty($arNowPropElementTo['VALUE'])) {
                    if ($arNowPropElementTo['MULTIPLE'] === 'Y') {
                        $arPropElementTo[$arNowPropElementTo['CODE']][] = $arNowPropElementTo['VALUE'];
                    } else {
                        $arPropElementTo[$arNowPropElementTo['CODE']] = $arNowPropElementTo['VALUE'];
                    }
                }
                break;
        }
    }

    if (!empty($arPropElementTo)) {
        $arSystemProp['PROPERTY_VALUES'] = $arPropElementTo;
    }

    return $arSystemProp;
}