Php/pimple

pimpleとは

DIコンテナのphpライブラリ

composerによるインストール

$ vi composer.json

{
   "require": {
       "pimple/pimple": "v3.*.*"
   }
}

>Installing pimple/pimple (v3.2.2)

$ php composer.phar install

DLされたPimple V3系

vendor/pimple/pimple/src/
└── Pimple
   ├── Container.php
   ├── Exception
   │   ├── ExpectedInvokableException.php
   │   ├── FrozenServiceException.php
   │   ├── InvalidServiceIdentifierException.php
   │   └── UnknownIdentifierException.php
   ├── Psr11
   │   ├── Container.php
   │   └── ServiceLocator.php
   ├── ServiceIterator.php
   ├── ServiceProviderInterface.php
   └── Tests
       ├── Fixtures
       │   ├── Invokable.php
       │   ├── NonInvokable.php
       │   ├── PimpleServiceProvider.php
       │   └── Service.php
       ├── PimpleServiceProviderInterfaceTest.php
       ├── PimpleTest.php
       ├── Psr11
       │   ├── ContainerTest.php
       │   └── ServiceLocatorTest.php
       └── ServiceIteratorTest.php

DIサンプル

$ vi ServiceInterface.php

namespace App\Services;
interface ServiceInterface
{
    public function doSomething();
}

$ vi Service.php

namespace App\Services;
class Service implements ServiceInterface
{
       public function doSomething()
       {
            return "hoge";
       }
}

$ vi Client.php

namespace App\Services;
class Client
{
    private $service;
    public function __construct(ServiceInterface $service)
    {
        $this->service = $service;
    }
    public function doSomething()
    {
        return $this->service->doSomething();
    }
}

$ vi PimpleexaController.php

use Pimple\Container;
use App\Services\Service;
class PimpleexaController extends Controller
{
    public function index()
    {
        $container = new Container();
        $container['service'] = function ($container) {
            $service = new Service();
            return $service;
        };
        $container['client'] = function ($container) {
            $client = new Client($container['service']);
            return $client;
        };
        $client = $container['client'];
        echo $client->doSomething(); // hoge
    }
}

サービスロケータはアンチパターン

$container変数をconstructの引数に渡す組み込み方法をサービスロケータというが これはアンチパターン

参考

http://blog.a-way-out.net/blog/2015/08/31/your-dependency-injection-is-wrong-as-I-expected/