PHP如何使用命名空间？namespace组织代码

<?php

// 声明命名空间
namespace AppHttpControllers;

class UserController
{
    public function index()
    {
        // ...
    }
}

// 另一个文件，在不同的命名空间
namespace AppModels;

class User
{
    // ...
}

use

<?php

namespace AppServices;

// 导入 AppModels 命名空间下的 User 类
use AppModelsUser;
// 导入 AppHttpControllers 命名空间下的 UserController 类，并给它一个别名 MyController
use AppHttpControllersUserController as MyController;

class UserService
{
    public function createUser()
    {
        $user = new User(); // 实例化 AppModelsUser
        // ...
    }

    public function handleRequest()
    {
        $controller = new MyController(); // 实例化 AppHttpControllersUserController
        // ...
    }
}

Cache

Cache

MyProjectCoreCache

ThirdPartyLibraryCache

Cache

use

new AppHttpControllersAdminDashboardController()

use

<?php

namespace AppReports;

use AppModelsOrder; // 导入 Order 类
use AppServicesAnalyticsDataProcessor; // 导入 DataProcessor 类
use AppUtilsHelperFunctions as Helper; // 导入 HelperFunctions 类并给它一个别名 Helper

class SalesReportGenerator
{
    public function generate()
    {
        $order = new Order(); // 引用 AppModelsOrder
        $processor = new DataProcessor(); // 引用 AppServicesAnalyticsDataProcessor
        Helper::log('Report generated'); // 引用 AppUtilsHelperFunctions 的静态方法
    }
}

use AppModelsOrder;

Order

AppModelsOrder

AppModelsUser

AppAuthUser

use ... as ...

use AppModelsUser as UserModel;

use AppAuthUser as AuthUser;

use

use AppModels{Order, Product, Customer as Client};

use

use

require

include

use

src/

App

src/

AppHttpControllersUserController

src/Http/Controllers/UserController.php

composer install

composer dump-autoload

composer.json

autoload

psr-4

vendor/autoload.php

public/index.php

require 'vendor/autoload.php';

// composer.json 示例
{
    "autoload": {
        "psr-4": {
            "App\": "src/"
        }
    }
}

require

Class '...' not found