How to integrate login Yii to Forums ( PHPBB, SMF)

is there a easy way to do that?

I only want to allow user to login with the forum registration :)

I think qjang had integrated old yii version with SMF :)

Someone can help us?

You should check if the respective forum provider provides API. As far as I’ve heard IP Board provides a very good API to share login details with custom scripts. The rest may be providing similar as well. Check in the respective support forums…I am sure the question has been asked long before you :)