Re: [PHP] two questions about usning session.

[Marek Kilimajer]

Session ID is stored in a cookie, and cookies are shared across 
instances of browser: if you open another window of the same browser, 
the same cookies are send, so you can have only one session to the same 
site (and path). To prevent this, you would have to give up cookies and 
use SID, but I don't know if it is worth the effort. If you just want to 
test your session management, use other browsers at the same time - 
mozilla, netscape, opera.

Joe Wong wrote:

Hi Justin,

 For the first problem, I found this option in PHP.INI do the trick:

; Set to {nocache,private,public,} to determine HTTP caching aspects
; or leave this empty to avoid sending anti-caching headers.
;session.cache_limiter = nocache
session.cache_limiter =
The default was set to nocache and after I change it to empty string, it
solved my problem.
For the second problem, I tried your script with two instances of IE 6.1
running, I didn't get two distinct values. Any idea?
- Joe

----- Original Message -----
From: "Justin French" <[EMAIL PROTECTED]>
To: "Joe Wong" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, March 12, 2003 8:43 PM
Subject: Re: [PHP] two questions about usning session.
 

on 07/03/03 5:45 PM, Joe Wong ([EMAIL PROTECTED]) wrote:

   

Hello,

I have two questions about using sessions in PHP.

Firstly, I use session to remeber the username and a session ID for the
given user. When I hit the BACK button on the browser (IE), it always
     

set
 

that my page is expired and ask me to click the refresh button. How to
prevent this from happening?
     

That sounds like a problem with POSTed data from forms, not necessarily a
problem with sessions, or a problem a browser.
Have you got a URL we can play with?

   

Secondly, how is the PHP session ID be computed? When user A login, a
session is started and his name nad session ID are stored. Now, on the
     

same
 

PC, I start another instance of the IE browser, login as User B, her
     

name
 

and session ID are stored under the same PHP session file. I switch back
     

to
 

the Windows of User A and continue to do something, the PHP session
     

gives me
 

the name of User B and User'B session ID. Why? Am I doing something
     

wrong
 

here?
     

Definitely.

- enable cookies on your browser
- make sure you're using PHP >= 4.1
1. Start with a blank text file.

2. Copy and paste this in:
---
<?php
session_start();
if (!isset($_SESSION['count'])) {
   $_SESSION['count'];
}
else {
   $_SESSION['count']++;
}
?>
Hello visitor, you have seen this page <?php echo $_SESSION['count'] ?>
times.<p>
To continue, <A HREF="<?php echo $_SERVER['PHP_SELF']; ?>">click here</A>
---
3. Open it up in your browser, and test that it works (the value of
$_SESSION['count'] should increase with each click)
4. If that much works, open up the URL in a second window, and try to run
two separate sessions... (the first window might be on 10 clicks, and the
new one will be starting from 1)
5. If we're still cool, now try it without cookies maybe, by adding the
   

SID
 

to the URL that they click on.

If all this works, then the problem is obviously in your code somewhere,
   

not
 

an issue with PHP/sessions/browsers/cookies/etc.

Justin



   



 



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