JavaScript-How do I return an array to responsetext in PHP?

I want to implement the following logic:

According to the above professional information, with PHP, ResponseText returns a two-dimensional array of course information.
What should be done on the other side of PHP?

Reply content:

I want to implement the following logic:

According to the above professional information, with PHP, ResponseText returns a two-dimensional array of course information.
What should be done on the other side of PHP?

This page uses Ajax to post the query information to PHP.
After the PHP received the information, warehousing inquiries, the corresponding courses to find out.
You can use JSON to attach different identification numbers at different times, and then print out the information.
The JS program at the front end is processed and formatted after receiving the message.

jquery is a step closer.

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