Yii: a free PHP framework

Yii is a free high-performance component-based PHP framework best for developing large-scale Web applications. Yii is PHP 5 only. PHP 4 is not supported. Because of this, Yii is able to take use of many PHP 5 features.

Yii comes with a full stack of features:

  • MVC design pattern
  • DAO / ActiveRecord
  • Internationalization and localization
  • Caching
  • jQuery-based AJAX support
  • Authentication and role-based access control
  • Input validation
  • Widgets
  • Events
  • Theming
  • Web services

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