浏览器的后退，前进，刷新（F5或ctrl + R）检查PHP？

Question

I want to make a page on which if user press back,forward or refresh the page it should says invalid page and if user clicks on the link available on that page it should says valid page.

I don't want to disable back and forward button. It should be done in PHP

thanks in advance.

Answer 1

The only way I can think of this being done in PHP is to append a one-time token to each and every link on the page, and expire them on the first use. That would however require storing them somewhere, for example a database or a cache.

Sessions could work too, with a unique ID generated for each page load.