How to fix the problem with namespace?

Question

Yii

Used yii2 basicit before and had no problems!
But now you need to use it advanced, but there is a problem with it!
For some reason, an error occurs with namespace, the system simply does not see them!
index.php example in frontend:


How can I fix this?

Answer 1

Write not yii\helper but \yii\helper

Answer 2

Given that you are writing in a storm, I would recommend removing the namespace from the class call.
Then you will have the class itself highlighted in yellow (as it is now on the screen), press alt-enter on it and import the class use block.