Question

There is a problem. I don’t want that people would be able to refresh one page on my site. How can I do it?

Answer 1

Refresh is a browser side solution. You can’t restrict it from server side.

What you can do is actually to use PHP’s SESSION to actually prevent people from visiting any page twice.

<?php

session_start();

if(!isset($_SESSION['disablethispage'])){
    $_SESSION['disablethispage'] = true;
    // serving the page first time

}else{
    // visited before or page was refreshed

}

However user is still able to come back to the same page if he/she removes the session cookie for your website.

If you’re talking about double posting, you might want to look at the POST-REDIRECT-GET Solution. See: http://en.wikipedia.org/wiki/Post/Redirect/Get