Migrate Yii Website Users To Phpbb Forum Users

Hi all,

I have a website based on Yii. We have registration on it so that users can leave comments under some posts and news. We just added a PHPBB 3 forum to it. I used the phpbb-integration-kit an it works fine for login and regiser new users.

My issue comes frem the old users who do not have registrations in PHPBB forum DB.

My question is how to migrate thoose users from my Yii DB to phpbb3 forum DB as the phpbb-integration-kit does for the new entries.

Thanks a lot in advance.