Building a multilevel nested category tree or menu is always a problem. Many CMS and sites only allow a certain level of nesting. In order to save performance issues due to multiple joins, some only allow 3-4 levels of nesting at maximum. Now, we will explore how we can create an N-level nested category tree or menu with the help of recursion, without compromising on performance. Here is our approach for the solution:
- We will define the table structure for the category in the database.
- We will get all categories in the table without the use of any join or multiple queries. It will be a single database query with a simple select statement.
- We will build an array of categories such that we can utilize the recursion with that to display the nested categories or menu.
Let's assume that we have a simple table structure in...