forum developed with yii, is there something?

I want to know if someone has developed a forum using yii and if he can share his code.

If no, it’s easier to develop a new forum system from 0 or integrate yii with VBulletin or IPB?

What do you mean by integrate?

i mean login, register, create post on forum creating the news, sync the comments, etch :)

I guess the reason there’s no forum build on yii is that it is a considerable amount of work.

It would therefore be easier to integrate an existing forum (like VBulletin or IPB) in your yii website.