[1.7] Product combinations

[knacky]

Hello.
I need advice on add / update product combinations.

$id_product = 12345;

$attributes = array(1,2,3,20,21,22); // id_attribute in ps_attribute.id_attribute
/* 1 - 3 = size, 20 - 22 = color */
/* all attributes in databse exists */

$product = new Product((int) $id_product);

$combinations = array();
$combinations[] = ??????????????????????;

$resetExistingCombination = true;

$product->generateMultipleCombinations($combinations, $attributes, $resetExistingCombination);

How to correctly add values to the generateMultipleCombinations function?
Thank you

Edited January 14, 2022 by knacky (see edit history)