SkuProps::getOffersIds

static function getOffersIds($productIds)
{
	if(!Loader::includeModule('catalog'))
		return array();

	$result = array();
	$offers = CCatalogSKU::getOffersList($productIds, 0, array(), array('ID'));

	if(is_array($offers))
	{
		foreach($offers as $productId => $items)
		{
			$result[$productId] ??= [];

			if(!is_array($result[$productId]))
			{
				$result[$productId] = [];
			}

			foreach($items as $item)
			{
				$result[$productId][] = $item['ID'];
			}
		}
	}

	return $result;
}