How to include / require `use` operator lines?

I dynamically generate my use statements and try to include them.

use.php (Path: /App/Test/Use/use.php)

<?php
    use App\Http\Utility\GeneralUtility;
    use App\Models\Project;
    use App\Http\Selenium;
?>

PlayController.php (Path: /App/Http/Controllers/PlayController.php)

<?php

    namespace App\Http\Controllers;
    require app_path() . '\Projects\Test\Use\use.php';
    ...

However, If I try to use a included/required class in my controller then I get the info that some classes are missing. E.g.

FatalThrowableError in PlayController.php line 30:
Class 'App\Http\Controllers\Selenium' not found

Of course it works If I write them manually into the Controller without using require:

<?php
    namespace App\Http\Controllers;

    use App\Http\Utility\GeneralUtility;
    use App\Models\Project;
    use App\Http\Selenium;

    ...

So why does it not work if I include / require them?

via EdwardBlack