how to call a function in PHP after 10 seconds of the page load (Not using HTML)

Question

Is there any way to call a function 10 seconds after the page load in PHP. (Not using HTML.)

Answer 1

This seems weird idea but maybe it's what you are looking for if you want to do it in PHP without touching HTML/JS:

The above is preety OK in theory, but in practice it will result in VERY memory consuming app. So be warned.

And please don't downvote me, this is only a theoretical dispute.