Yii is a free, open-source, PHP framework best for developing both web applications and APIs. It comes with rich features: MVC, DAO/ActiveRecord, I18N/L10N, caching, authentication and role-based access control, scaffolding, testing, etc.
Yii Framework mindshare
As of August 2025, the mindshare of Yii Framework in the PHP Frameworks category
stands at 21.4%, up from 11.3% compared to the previous year, according to calculations based on PeerSpot user engagement data.
