Encrypted session BLOB?

session_regenerate_id() will trigger a write() call, and thus - you can update it right after that.

That's exactly what I tried. The line after session_regenerate_id() I got the new session ID with session_id() and attempted to update the row in the database via the new session ID but it didn't update, leading me to believe write() was not being called until *after* sess_regenerate() finished and therefore the row didn't exist yet to modify.

Any idea why this is happening?