Which forum to choose for a yii site in php?

Question

PHP

Hello, I need a forum for a site on yii so that you can connect your users from the database, and not the forum itself created a separate table and you had to register on the forum ..
For example, on many sites where vbullet is installed, there is a separate registration on the site and a separate one on the forum. And I would like my users to go to the site and immediately click on the forum and they were already logged in there