Track when user hits back button on the browser

Question

Is it possible to detect when the user clicks on the browser\'s back button?

I have an Ajax application and if I can detect when the user clicks on the back button I

Answer 1

I set a variable $wasPosted in $_SESSION with value false.

All my posts go via the same php file, and set $wasPosted to true.

All header(location:) requests are preceded by setting $wasPosted to true.

If $wasPosted is false then the page was loaded after use of the backward or forward buttons.