Getting registered variables-secure site

Anon

I am an intermediate PHP programmer and am designing a basic shopping cart. When I use the functions
<?
session_start();
session_register("Session_ID");
?>
I can view the variable $Session_ID on subsequent pages. But when I go over to the secure page (different computer and address altogether) the $Session_ID variable is undefined when I call
<?
session_start();
echo $Session_ID;
?>
Anyone have solutions to this problem. How can I keep the $Session_ID without actually passing variables, say through the URL or through a form?

Anon

It's not really complex, your session data can't move between computers without a little help - in that you would need to mount the temp directory for the local machine (where session data is stored) on the remote machine. I've never tried this, and don't know that it would work.

Anon

Solution 1:
You could try using cookies rather than sessions. Check out the article on cross-domain cookies here on phpbuilder.

http://www.phpbuilder.com/columns/chriskings20001128.php3

Solution 2:
You could put the sessions variables in a string and pass them in the URL to the new site. This however isn't the most secure thing to do if you are storing usernames and passwords in the session.

Solution 3:
If both web servers are using the same database server, you could store all of the info you need in the database instead of in session variables. You could then pass a reference id to the secure site in the URL and not worry about it.

Anon

The real problem though, is that I am using FLASH navigation and one of the buttons is a "check out" button AND the URL changes to a secure URL. Meaning, the session data is destroyed. Because the session id is PHP created, I can't pass it to the FLASH. Any other suggestions. Thanx for those who posted, but I'm still looking...