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What is Yii :: app () in php framework yii

I am new to yii. I want to know about Yii::app() . I was looking for him, but I definitely do not understand.

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Please read the information at this link. You will understand this.

YII Documentation

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Yii is Yii singleton: http://www.yiiframework.com/doc/api/1.1/Yii

Yii::app() returns an instance of CApplication: http://www.yiiframework.com/doc/api/1.1/CApplication

Which has many convenient methods and variables, such as user (link to Yii::app()->user , which was user information)

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