Получить ID инфоблока по его коду

GetIBlockIDByCode

function GetIBlockIDByCode($code, $type = '')
{
    CModule::IncludeModule("iblock");

    $arrFilter = array(
        'ACTIVE'  => 'Y',
        'CODE'    => $code,
        'SITE_ID' => "s1",
    );

    if ($type) {
        $arrFilter['TYPE'] = $type;
    }

    $res        = CIBlock::GetList(Array("SORT" => "ASC"), $arrFilter, false);
    $arIBlockId = "";

    if ($ar_res = $res->Fetch()) {
        $arIBlockId = $ar_res["ID"];
    }

    return $arIBlockId;
}

    $files = [];
    $res = FileTable::getList(array(
        'select' => array(
            'FILE_ID'
        ),
        'filter' => array(
            'ENTITY_ID' => $entityId,
            '=ENTITY_TYPE' => $entityType
        )
    ));
    while ($row = $res->fetch())
    {
        $files[] = $row['FILE_ID'];
    }
    return $files;
}