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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? 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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What is a namespace in PHP, and what problem does it solve when working with larger applications or third party libraries?

Beginner

Answer

A namespace lets you group related classes, functions, and constants under a common named prefix, solving the problem of naming collisions that can occur when two different classes, perhaps from your own code and a third party library, happen to share the exact same class name, since namespaces let both classes coexist without conflict by qualifying each one with its own distinct namespace.
namespace App\Models;

class User {
}

// Used elsewhere as App\Models\User
Real-world example A project using both its own custom Logger class and a third party library's own separate Logger class avoids any naming conflict entirely, since each class lives within its own distinct namespace and can be referenced unambiguously.

Common follow-ups: What is the difference between a fully qualified class name and a relative class name?;How do namespaces relate to the actual folder structure of a project?

OOP;Composer
All 7 Namespaces & Autoloading questions