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What is a namespace in PHP, and what problem does it solve when working with larger applications or third party libraries? How does PSR-4 autoloading work, and how does it map a namespace structure directly to a corresponding directory structure on disk? What is the difference between using a relative namespace reference, a fully qualified name starting with a backslash, and importing a class with use, when referencing a class from within a namespaced file? How do you organize namespaces effectively in a larger application to reflect logical groupings such as models, services, and controllers? How does Composer's classmap and files autoloading mechanism differ from PSR-4, and when would you use these alternative approaches instead? How does Composer generate and optimize its autoloader for production, and what is the difference between the development autoloader and an optimized production autoloader?
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How do you use the use keyword to import a class from a specific namespace, letting you reference it by its short name within a file?

Beginner

Answer

The use keyword lets you import a specific class from another namespace at the top of a PHP file, allowing you to refer to that class using just its short name for the remainder of the file rather than needing to type out its full namespace path every single time it is referenced, significantly improving code readability when working with classes from multiple different namespaces.
use App\Models\User;
use App\Services\Mailer;

$user = new User();
$mailer = new Mailer();
Real-world example A controller class imports both a User model and a Mailer service using the use keyword at the top of the file, allowing the rest of the file to reference both classes by their short, familiar names.

Common follow-ups: What happens if you try to import two different classes that both share the same short name?;How do you use the as keyword to give an imported class a different alias?

OOP;Composer
All 7 Namespaces & Autoloading questions