How to create a classic menu from Nested Sets in Yii2?

Question

Yii

- item
   - item1
- item2
   - item3
       - item4

etc.
Help with the code, I'm confused in three pines.

Answer 1

Nested Sets are recursion etc. So it's not that hard to get lost. But there are ready-made solutions.
Here is a very good one: https://github.com/creocoder/yii2-nested-sets