How to set sorting in catalog.section.list by id in forward or reverse order?

Question

1C-Bitrix

Tried:

//ORDER BY
  $arSort = array(
    "left_margin"=>"id",
  );

Does not work

Answer 1

$arSort is an associative array for sorting the value, in the format "Field ID" => "Order".
Moreover, the order can only be ASC (ascending) or DESC (descending)
In your case, it should be like this:

$arSort = array(
  "LEFT_MARGIN" => "ASC",
);