Namespaces in Files in OOP in PHP

The namespace command can be used not only in files with class definitions, but also in any other files. For example, let's define a namespace in the file index.php:

index.php<?php
  namespace Admin;
?>

Задание 1

Suppose an object of the Controller class is created in the file index.php:

index.php<?php
  namespace Admin;
  
  new \Admin\Controller;
?>

Simplify the code for creating the object, taking into account that the creation of the class object occurs in the same namespace to which the class belongs.