PHP Session无法在PHP5中运行

Question

I have 2 pages: login.php and index.php. Both pages start with

session_start();

When I set

$_SESSION['user'] = "name"; 

in login.php and than open index.php, my session object is empty. How come?

EDIT:

I found the problem: IE 7. I had to grand access to my domain. However, I thought a session is stored on the server, instead of the client? Than why do I have IE grand access to my domain? (http://www.pcwindowstips.com/2007/09/04/how-to-enable-cookies-in-internet-explorer-7/)

Answer 1

I thought a session is stored on the server, instead of the client? Than why do I have IE grant access to my domain? (http://www.pcwindowstips.com/2007/09/04/how-to-enable-cookies-in-internet-explorer-7/)

The way sessions work is that a session cookie is stored for the site, which contains your session ID. The only way the server knows who you are is when it reads the session ID cookie on every page load. All of the $_SESSION data is stored on the server for each user, but the cookie must be set for the server to know which $_SESSION data to retrieve.

This is also why you can essentially "become" another user if you obtain their session id cookie.