jQuery : Allow access to PHP file only through ajax on local server

jQuery : Allow access to PHP file only through ajax on local server
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

Here's a secret feature that I promised to disclose to you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
After that, type the word 'awesome' on your keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

Let me give you a quick introduction about myself,
Hello everyone, I'm Delphi.
Allow me to support you in answering your questions.
jQuery : Allow access to PHP file only through ajax on local server
If you need more specific information, let me know by leaving a comment or starting a chat.
If you have knowledge to contribute or an answer to provide, we encourage you to comment below.
I will 'heart' your answer as a sign of appreciation.
ajax Allow access local only server to : through PHP file on jQuery