with many professionals constantly contributing to the development of Yii. The Yii developer team
keeps a close eye on the latest trends of Web development, and on the best practices and features
found in other frameworks and projects. The most relevant best practices and features found elsewhere are regularly incorporated into the core framework and exposed
Yii currently has two major versions available: 1.1 and 2.0. Version 1.1 is the old generation and is now in maintenance mode. Version 2.0 is a complete rewrite of Yii, adopting the latest
technologies and protocols, including Composer, PSR, namespaces, traits, and so forth. Version 2.0 represents the latest
Yii 2.0 also makes use of the latest features of PHP, such as [namespaces](http://www.php.net/manual/en/language.namespaces.php) and [traits](http://www.php.net/manual/en/language.oop5.traits.php). Understanding these concepts will help