120 lines
4.1 KiB
Markdown
120 lines
4.1 KiB
Markdown
# PHP-DI integration with Slim
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This package configures Slim to work with the [PHP-DI container](http://php-di.org/).
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[![Build Status](https://travis-ci.org/PHP-DI/Slim-Bridge.svg?branch=master)](https://travis-ci.org/PHP-DI/Slim-Bridge)
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[![](https://img.shields.io/packagist/dt/php-di/slim-bridge.svg)](https://packagist.org/packages/php-di/slim-bridge)
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The full documentation is here: **http://php-di.org/doc/frameworks/slim.html**
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## Why?
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### PHP-DI as a container
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The most obvious difference with the default Slim installation is that you will be using PHP-DI as the container, which has the following benefits:
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- [autowiring](http://php-di.org/doc/autowiring.html)
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- powerful [configuration format](http://php-di.org/doc/php-definitions.html)
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- support for [modular systems](http://php-di.org/doc/definition-overriding.html)
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- ...
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If you want to learn more about all that PHP-DI can offer [have a look at its introduction](http://php-di.org/).
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### Controllers as services
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While your controllers can be simple closures, you can also **write them as classes and have PHP-DI instantiate them only when they are called**:
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```php
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class UserController
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{
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private $userRepository;
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public function __construct(UserRepository $userRepository)
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{
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$this->userRepository = $userRepository;
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}
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public function delete($request, $response)
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{
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$this->userRepository->remove($request->getAttribute('id'));
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$response->getBody()->write('User deleted');
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return $response;
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}
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}
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$app->delete('/user/{id}', ['UserController', 'delete']);
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```
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Dependencies can then be injected in your controller using [autowiring, PHP-DI config files or even annotations](http://php-di.org/doc/definition.html).
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### Controller parameters
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By default, Slim controllers have a strict signature: `$request, $response, $args`. The PHP-DI bridge offers a more flexible and developer friendly alternative.
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Controller parameters can be any of these things:
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- the request or response (parameters must be named `$request` or `$response`)
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- route placeholders
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- request attributes
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- services (injected by type-hint)
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You can mix all these types of parameters together too. They will be matched by priority in the order of the list above.
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#### Request or response injection
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You can inject the request or response in the controller parameters by name:
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```php
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$app->get('/', function (ResponseInterface $response, ServerRequestInterface $request) {
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// ...
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});
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```
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As you can see, the order of the parameters doesn't matter. That allows to skip injecting the `$request` if it's not needed for example.
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#### Route placeholder injection
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```php
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$app->get('/hello/{name}', function ($name, ResponseInterface $response) {
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$response->getBody()->write('Hello ' . $name);
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return $response;
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});
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```
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As you can see above, the route's URL contains a `name` placeholder. By simply adding a parameter **with the same name** to the controller, PHP-DI will directly inject it.
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#### Request attribute injection
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```php
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$app->add(function ($request, $response, $next) {
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$request = $request->withAttribute('name', 'Bob');
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return $next($request, $response);
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});
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$app->get('/', function ($name, ResponseInterface $response) {
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$response->getBody()->write('Hello ' . $name);
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return $response;
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});
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```
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As you can see above, a middleware sets a `name` attribute. By simply adding a parameter **with the same name** to the controller, PHP-DI will directly inject it.
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#### Service injection
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To inject services into your controllers, you can write them as classes. But if you want to write a micro-application using closures, you don't have to give up dependency injection either.
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You can inject services by type-hinting them:
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```php
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$app->get('/', function (ResponseInterface $response, Twig $twig) {
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return $twig->render($response, 'home.twig');
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});
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```
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> Note: you can only inject services that you can type-hint and that PHP-DI can provide. Type-hint injection is simple, it simply injects the result of `$container->get(/* the type-hinted class */)`.
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## Documentation
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The documentation can be read here: **http://php-di.org/doc/frameworks/slim.html**
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