Apache on WinXP vs Apache on linux

[zalath]

This is peculiar.

I have a test system at home for beta-testing sites before production. It runs a Windows XP Pro with Apache 1.3.22, PHP 4.1.1 and MySQL 3.something or other. I don't think that's really relevant.

On the production server we have a Linux/apache/php/mysql -combo, with near-identical version numbers.

The peculiarity is that when I run my user login scripts on the local site, they work just as intended - after the user logs off, if back is pressed it notifies that the user has, in fact, logged off, and therefore the data can't be displayed.
When I run the exact same code on the linux system, pressing back displays the user information regardless of the logoff.

I suppose this might be an apache thing, but since I have no idea where to start seeking, I'll just bother you guys =)

[Anon]

Check the value of session.cache_limiter in php.ini.

[zalath]

Well on my local server it sez nocache, so I'll just assume that on the remote it's private or public. Anyway, I tried the session_cache_limiter() function without it doing much good.

Before you start a lecture on headers, here's what I use:
$now = gmdate('D, d M Y H:i:s') . ' GMT';
header('Expires: 0');
header('Last-Modified: ' . $now);
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: pre-check=0, post-check=0, max-age=0');
header('Cache-Control: private');

header('Pragma: no-cache');