Index: ./includes/session.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/session.inc,v
retrieving revision 1.32
diff -u -r1.32 session.inc
--- ./includes/session.inc	31 Aug 2006 19:52:39 -0000	1.32
+++ ./includes/session.inc	4 Oct 2006 07:33:47 -0000
@@ -85,6 +85,13 @@
 function sess_regenerate() {
   $old_session_id = session_id();
   session_regenerate_id();
+
+  // This manual cookie reset is required to mitigate this issue http://bugs.php.net/bug.php?id=32802.
+  // This issue only arises in PHP versions before 4.4.0, and in certain drupal configurations.
+  // We destroy the session cookie on the client by setting the cookie to expire in the past (a negative value).
+  if (isset($_COOKIE[session_name()])) {
+    setcookie(session_name(), '', time() - 42000, '/');
+  }
+
   db_query("UPDATE {sessions} SET sid = '%s' WHERE sid = '%s'", session_id(), $old_session_id);
 }