PHP — Namespaces

Basic namespace

<?php
namespace App\Models;

class User {
    public string $name;
}
?>

Using namespaces

<?php
use App\Models\User;
use App\Models\Product as P;

$user = new User();
$product = new P();
?>

Full qualified name

<?php
$user = new \App\Models\User();
?>

Namespace organization

src/
├── Models/
│   ├── User.php
│   └── Product.php
├── Controllers/
│   └── UserController.php
└── Services/
    └── EmailService.php

PSR-4 autoloading

{
    "autoload": {
        "psr-4": {
            "App\\": "src/"
        }
    }
}

Mini Practice

Write PHP code that:

1. Defines a namespace
2. Uses use statements
3. Organizes code with namespaces
4. Sets up PSR-4 autoloading

Up Next

In the next lesson, you'll learn about Type Hints — type declarations.