We have an existing user database (in our SMF forum) and we want to setup an OpenID server so that our users can use their account to login also on other sites.
The user database can be accessed via MySQL and we can only use PHP on that server.
I stumbled upon www.openidoo.com but that doesn't seem to work. At least on their demo page, I created a user account and tried to link that to my SourceForge account but SourceForge just always says "There was an error using your OpenID.". If it would have worked, I would have hacked it somehow that it uses the user accounts from the SMF forum instead.
Any other suggestion?