Javascript-how to use php to return an array to responseText?

I want to implement the following logic: based on the above professional information, use php to return a two-dimensional array of course information to responseText. How can php be implemented?

I want to implement the following logic:

Based on the above professional information, use php to return a two-dimensional array of course information to responseText.
How can php be implemented?

Reply content:

I want to implement the following logic:

Based on the above professional information, use php to return a two-dimensional array of course information to responseText.
How can php be implemented?

This page uses ajax to POST the query information to PHP.
After receiving the information, php enters the database for query and finds out the corresponding course.
You can attach different identification numbers to different time periods and print the information in JSON format.
The front-end JS program processes and formats the information after receiving it.

JQuery step by step