Yii2 Explain Front slash before \Yii::$app

Explain Front slash before


\Yii::$app 

.

How it works?

Why there is front slash before Yii::$app?

In PHP it means fully qualified class name (FQN). In this case it’s Yii class from the root namespace.

@samdark Thanks.

I think I have to read namespace in PHP.