I have a PHP website I'm maintaining and I've confirmed that this worked at one point.

We have a website utilizing a login system which stores a logged in user's information in a `$_SESSION['user']` variable. The site used to log out the user when clicking */logout.php* which essentially removed that portion of the session, then `header()` redirected to the homepage.

As of recently, the */logout.php* file with `session_start()` at the top somehow doesn't see the session information when `print_r()` is used to output it for debugging purposes.

If I go to another page, I see the session info just fine, but not on the logout page...which is exactly why I cannot remove the session info, because it's not accessible.

I thought `$_SESSION` was global on the site until the browser was closed. I've never had this happen and I know the session instance was started on this page, so it's weird that it's not showing me the session data.

Any ideas? I'm totally stumped on this one!

Code: /logout.php

```
<?
#session_start() is inside this file
require_once($_SERVER['DOCUMENT_ROOT'].'/includes/config.php');

unset($_SESSION['user']);
header("location: /");
exit();
?>

```

The checking of `$_SESSION['user']` is site-wide and I call to various items below it when needed for different things. Someone else built this site and I'm trying to debug why it's not working for them all of a sudden.