Get the name value passed by the image button in php

To retrieve the name value passed by the image button in php, I need to use the image button to beautify my web. However, the variable value will appear in the browser bar using the connection transfer method, this seems uncomfortable. if you use hidden for submission, you don't think it is necessary, because since the image has the name attribute, you should be able to get it. why should you add a variable? No one answered the question after posting it in bbs for several days, so I had to read the book and find a solution!

When the image in the form is used as the submit, two variables are generated, for example:

Then, two variables, aaa_x and aaa_y, are generated during the submission process.
It contains the specific position x and y of the image on the screen.
Then, in php, you only need to judge aaa_x and aaa_y.

You do not need to hide the domain, javascript, and pass the value through connections!

Test passed. welcome to test