Php triple menu solution

Php triple menu 1 & nbsp; | -- Sub Menu 1 & nbsp; | -- content 1 & nbsp; | & nbsp; | -- content 2 & nbsp; | & nbs php triple menu
Menu 1
|
| -- Sub-menu 1
|
| -- Content 1
|
| -- Content 2
|
|
|
| -- Sub-menu 2
|
| -- Content 1
|
| -- Content 2
Menu 2
|
| -- Sub-menu 1
|
| -- Content 1
|
| -- Content 2
|
|
|
| -- Sub-menu 2
|
| -- Content 1
|
| -- Content 2


As shown in a form, the menu name and content can be called from the database.
Only the selected content is submitted.
How can this problem be achieved?

------ Solution --------------------
Unlimited classification.
Search by Baidu
------ Solution --------------------
Use a sub-parent table, and then use recursion to loop to implement an infinite level tree