How to randomize section output in catalog.section.list?

Question

PHP

Hello connoisseurs!
How can I display 3 random sections marked with a custom field "New" in catalog.section.list?
I select by custom field:

$arFilter = array(
        "ACTIVE" => "Y",
        "GLOBAL_ACTIVE" => "Y",
        "IBLOCK_ID" => $arParams["IBLOCK_ID"],
        "CNT_ACTIVE" => "Y",
        "!UF_NEW_COLLECTION" => 0, // Пользовательское поле "Новинка"
    );

Number of items to display: How to apply random sorting for catalog.section.list??? When displaying elements, you can apply sorting like this: This does not work in catalog.section.list! Where to dig comrades?
$arNavStartParams = Array("nTopCount" => 3);
$arOrder = Array("RAND" => "ASC");

Answer 1

Get all sections, and then do array_shuffle and select the first three