How to sort the output of goods by groups in the Bitrix catalog?

Question

1C-Bitrix

How to display products in groups in the catalog, in this case, by manufacturer:

Answer 1

Look at the materials for preparing for exam No. 2 of the Bitrix Academy for training, it discusses the issues of expanding the capabilities of the system.
You can write your own component or modify the standard one through result_modifier.
Checklist of your task:
1) iblock sections - getting sections
2) iblock elements - getting elements
3) make an array with grouping of elements (we form the key ID of the section and its elements)
4) Add the resulting grouped list to your resulting array key $arResult
5 ) In the component template, we process and display data as needed