Detect whether the browser is refreshed or not using PHP

Question

I want to detect whether the browser is refreshed or not using PHP, and if the browser is refreshed, what particular PHP code should execute.

Answer 1

If you mean that you want to distinguish between when a user first comes to the page from when they reload the page check the referrer. In php it is: $_SERVER["HTTP_REFERER"]. See if it is equal the page your script is running on. It may be the case that the client doesn't provide this information, if that happens you could set a cookie or session variable to track what the last requested page was.