How and where should I use the keyword “use” in php

Question

I used use the keyword \"use\" generally above the class definition. Like this:

Answer 1

In PHP, the keyword use is used in 3 cases:

1. As class name alias - simply declares short name for a class (must be declared outside of the class definition) (manual: Using namespaces: Aliasing/Importing )
2. To add a trait to a class (must be declared inside (at the top) of the class definition) (manual: Traits)
3. In anonymous function definition to pass variables inside the function (manual: Anonymous functions)