troubleshooting Question

Switching sessions mid-stream

Avatar of pnoeric
pnoericFlag for United States of America asked on
PHP
5 Comments1 Solution225 ViewsLast Modified:
I have an app that stores the user's IP and useragent with the session... then also stores the session ID in the database.

Every time a page is accessed, I check the current session against the one in the DB. If they're differerent, voila, I can tell the account is logged in from two different computers at the same time.

What I'm trying to do now is switch over to the canned session and fetch the old IP and useragent so I can log them. My code is as follows:


$oldsess = (fetched from user record in db)
$newsess = session_id();

if ($oldsess != $newsess) {

      session_id($oldsess);            // switch to the one we found in the db
      session_start();
      $oldIP = $_SESSION['ip'];
      $oldUserAgent = $_SESSION['useragent'];
      
      session_id($newsess);            // switch back to the current one
      session_start();
      $newIP = $_SESSION['ip'];
      $newUserAgent = $_SESSION['useragent'];

The problem is that it's not really 'switching' sessions when I try to go to the old one-- at the end of the code above, $oldIP == $newIP and $oldUserAgent == $newUserAgent.

Why is this failing? Does switching sessions require a page refresh (so http headers are sent), or something like that?

E

p.s. I'm trying to avoid storing the IP address in the db, though that would be a different way to solve this.
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