Does anyone have a good 'redirect if cookies disabled' snippet?

BrianNardone wrote: I'm under the impression that sessions will work even if cookies are disabled since cookies write to disk and sessions write to brower memory.

In theory, you can enable sessions to work without cookies, but it's considered insecure, and is disabled by default.

A simple way to test whether cookies are disabled is to try to set a cookie and then retrieve its value. Unfortunately, you can't do this in a single operation, because cookies aren't accessible until the page has been reloaded or the user has moved to a new page.

On page 1:

<?php setcookie('cookietest', 'cookiesOK'); ?>

On the next page:

<?php
if (!isset($_COOKIE['cookietest']) || $_COOKIE['cookietest'] != 'cookieOK') {
  header('Location: somewhereelse.php');
  exit;
}