My web host recently upgraded to PHP 4.1.2.  At the same time, my user login scripts stopped working.  A session variable registered with session_register() is not holding its information when the page reloads.

Details:

I have a file included in every page that looks like:


class UserSession
{
var $user_id = 0;
var $username = "";
var $logged_in = false;
//other stuff elided
}

session_start();
global $user_session;
if (!session_is_registered("user_session"))
        {
        session_register("user_session");
        $user_session = new UserSession();
        }

function ProcessLogin($Username, $Password)
{
global $user_session;
//username and password are checked against DB contents
//if that's all good, get user row with mysql_fetch_array()
$user_session->user_id = $row[user_id];
$user_session->username = $row[user_name];
$user_session->logged_in = true;
//cookies are set and other stuff happens
}

When a page loads immediately after the user logs in, all is well, and the values in $user_session are all as I expect them to be.  Reloading the same page, though, causes $user_session to be set back to its default values.  Before the 4.1.2 upgrade, this worked fine.

I've stripped the code down almost to what I show above, and it still fails, so I'm pretty sure I'm not doing anything to stomp the values later in the page.  I double-checked that on the page reload, $user_session is still registered, and it appears to be.

The changelog at http://www.php.net/ChangeLog-4.php only goes up to version 4.1.1, so I couldn't tell if there was any change to session variable handling in 4.1.2.

Any thoughts?  All suggestions are appreciated.

Config line:
 './configure' '--with-mysql' '--with-apache=../apache_1.3.23' '--enable-track-vars' '--with-xml' '--enable-memory-limit=yes' '--enable-bcmath' '--with-gd=../gd-2.0.1' '--enable-gd-native-tt' '--enable-gd-imgstrttf' '--with-gdbm=/usr/include' '--enable-calendar' '--with-png-dir=/usr/lib' '--with-zlib-dir=/usr/include' '--with-freetype-dir=/usr/local/include/freetype2' '--with-jpeg-dir=/usr/local/lib' '--with-mcrypt' '--enable-trans-sid' '--with-sablot=/usr/local/lib' '--with-imap' '--enable-xslt' '--with-xslt-sablot' '--enable-sablot-errors-descriptive'

Host info:
Linux *.*.com 2.2.19-6.2.11 #1 Fri Oct 19 13:28:00 EDT 2001 i686 unknown

Server is latest stable Apache.