命名空间 #

<?php
namespace App\Models;

class User
{
    public string $name;
}

<?php
use App\Models\User;

$user = new User();

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

<?php
namespace App\Models\Entities;

class User {}

<?php
use App\Models\Entities\User;

<?php
use App\Models\User;
use App\Services\UserService;

<?php
use App\Models\User as UserModel;
use App\Services\User as UserService;

<?php
use function App\Helpers\formatDate;
use function App\Helpers\calculate as calc;

<?php
use const App\Config\VERSION;

<?php
use App\Models\{User, Order, Product};
use App\Services\{UserService, OrderService};

<?php
namespace App;

class Example {}

<?php
namespace {
    
}

<?php
namespace App\Models;

echo __NAMESPACE__;

App\Models\User => src/Models/User.php
App\Services\UserService => src/Services/UserService.php

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

<?php
require 'vendor/autoload.php';

use App\Models\User;

$user = new User();

<?php
namespace App\Models;

class User
{
    
}

<?php
use App\Models\User;

$user = new User();

App/
├── Models/
│   ├── User.php
│   └── Order.php
├── Services/
│   └── UserService.php
└── Controllers/
    └── UserController.php