How was the next element of the array displayed during the new processing of the array?

Question

1C-Bitrix

I'm just learning, please help or I won't be able to sleep tonight.
Tell me this question there is an Array processing inside an array

like this is displayed on the page

How to make each new element of the first array correspond to an element of the internal array.
In general, what was it like here?

Answer 1

like so