PSR-7 : Slim supports PSR-7 interfaces for its Request and Response objects. This makes Slim flexible because it can use any
PSR-7 implementation. For example, you could return an instance of
GuzzleHttp\Psr7\CachingStream or any instance returned by the
GuzzleHttp\Psr7\stream_for() function.
Value objects : Request and Response objects are immutable value objects. They can be “changed” only by requesting a cloned version that has updated property values. Value objects have a nominal overhead because they must be cloned when their properties are updated. This overhead does not affect performance in any meaningful way.
You can request a copy of a value object by invoking any of its PSR-7 interface methods (these methods typically have a with prefix). For example, a PSR-7 Response object has a withHeader($name, $value) method that returns a cloned value object with the new HTTP header.
<?php
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;
require __DIR__ . '/../vendor/autoload.php';
$app = AppFactory::create();
$app->get('/foo', function (Request $request, Response $response, array $args) {
$payload = json_encode(['hello' => 'world'], JSON_PRETTY_PRINT);
$response->getBody()->write($payload);
return $response->withHeader('Content-Type', 'application/json');
});
$app->run();
The PSR-7 interface provides these methods to transform Request and Response objects:
* withProtocolVersion($version)
* withHeader($name, $value)
* withAddedHeader($name, $value)
* withoutHeader($name)
* withBody(StreamInterface $body)
The PSR-7 interface provides these methods to transform Request objects :
* withMethod($method)
* withUri(UriInterface $uri, $preserveHost = false)
* withCookieParams(array $cookies)
* withQueryParams(array $query)
* withUploadedFiles(array $uploadedFiles)
* withParsedBody($data)
* withAttribute($name, $value)
* withoutAttribute($name)
The PSR-7 interface provides these methods to transform Response objects:
* withStatus($code, $reasonPhrase = '')
