Martin wrote:
You're better using an auth plugin. I'm sure there's already one for PhpBB login.
There is something out there already but the problem is that it's in the wrong direction, ie you have to login using mediawiki instead of the other way round.
Are you sure on it?
An auth plugin fires on login, so it can authenticate the user against the phpbb password db, and create the mw user if not existing for mediawiki.
In fact, http://www.mediawiki.org/wiki/Extension:PHPBB/Users_Integration seems to be what you want.