It might be members_total, I don't know, but it doesn't change the fact that you need to make that data public somehow since you can't call it directly as it doesn't work.
Hmmm I'll keep trying, there must be a simple solution.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.