升级指南

/**
 * Slim 3 App::__construct($container = [])
 * As seen here the settings used to be nested
 */
$app = new App([
    'settings' => [...],
]);

/**
 * Slim 4 App::__constructor() method takes 1 mandatory parameter and 4 optional parameters
 *
 * @param ResponseFactoryInterface Any implementation of a ResponseFactory
 * @param ContainerInterface|null Any implementation of a Container
 * @param CallableResolverInterface|null Any implementation of a CallableResolver
 * @param RouteCollectorInterface|null Any implementation of a RouteCollector
 * @param RouteResolverInterface|null Any implementation of a RouteResolver
 */
$app = new App(...);

/**
 * Slim 3.x shipped with the Pimple container implementation and enabled the following syntax
 */
$container = $app->getContainer();

//Assign dependencies as array
$container['view'] = function (\Psr\Container\ContainerInterface $container){
    return new \Slim\Views\Twig('');
};


/**
 * Slim 4.x does not ship with a container library. It supports all PSR-11 implementations such as PHP-DI
 * To install PHP-DI `composer require php-di/php-di`
 */

use Slim\Factory\AppFactory;

$container = new \DI\Container();

AppFactory::setContainer($container);
$app = AppFactory::create();

$container = $app->getContainer();
$container->set('view', function(\Psr\Container\ContainerInterface $container){
    return new \Slim\Views\Twig('');
});

use Slim\Factory\AppFactory;
// ...
$app = AppFactory::create();
$app->setBasePath('/my-app-subpath');
// ...
$app->run();

$app->group('/user', function(\Slim\Routing\RouteCollectorProxy $app){
    $app->get('', function() { /* ... */ });
    //...
});

<?php
use Slim\Factory\AppFactory;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

// Add Routing Middleware
$app->addRoutingMiddleware();

// ...

$app->run();

<?php
use Slim\Factory\AppFactory;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

/**
 * The routing middleware should be added before the ErrorMiddleware
 * Otherwise exceptions thrown from it will not be handled
 */
$app->addRoutingMiddleware();

/**
 * Add Error Handling Middleware
 *
 * @param bool $displayErrorDetails -> Should be set to false in production
 * @param bool $logErrors -> Parameter is passed to the default ErrorHandler
 * @param bool $logErrorDetails -> Display error details in error log
 * which can be replaced by a callable of your choice.

 * Note: This middleware should be added last. It will not handle any exceptions/errors
 * for middleware added after it.
 */
$app->addErrorMiddleware(true, true, true);

// ...

$app->run();

<?php
use Psr\Http\Message\ServerRequestInterface;
use Slim\Factory\AppFactory;
use Slim\Exception\HttpNotFoundException;
use Slim\Exception\HttpMethodNotAllowedException;
use Slim\Psr7\Response;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

$errorMiddleware = $app->addErrorMiddleware(true, true, true);

// Set the Not Found Handler
$errorMiddleware->setErrorHandler(
    HttpNotFoundException::class,
    function (ServerRequestInterface $request, Throwable $exception, bool $displayErrorDetails) {
        $response = new Response();
        $response->getBody()->write('404 NOT FOUND');

        return $response->withStatus(404);
    });

// Set the Not Allowed Handler
$errorMiddleware->setErrorHandler(
    HttpMethodNotAllowedException::class,
    function (ServerRequestInterface $request, Throwable $exception, bool $displayErrorDetails) {
        $response = new Response();
        $response->getBody()->write('405 NOT ALLOWED');

        return $response->withStatus(405);
    });

<?php
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;
use Slim\Routing\RouteContext;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

$app->get('/hello/{name}', function (Request $request, Response $response) {
    $routeContext = RouteContext::fromRequest($request);
    $routingResults = $routeContext->getRoutingResults();
    
    // Get all of the route's parsed arguments e.g. ['name' => 'John']
    $routeArguments = $routingResults->getRouteArguments();
    
    // A route's allowed methods are available at all times now and not only when an error arises like in Slim 3
    $allowedMethods = $routingResults->getAllowedMethods();
    
    return $response;
});

// ...

$app->run();

<?php
use Slim\Factory\AppFactory;
use Slim\Middleware\MethodOverridingMiddleware;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

$methodOverridingMiddleware = new MethodOverrideMiddleware();
$app->add($methodOverridingMiddleware);

// ...

$app->run();

<?php
use Slim\Factory\AppFactory;
use Slim\Middleware\ContentLengthMiddleware;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

$contentLengthMiddleware = new ContentLengthMiddleware();
$app->add($contentLengthMiddleware);

// ...

$app->run();

<?php
use Slim\Factory\AppFactory;
use Slim\Middleware\OutputBufferingMiddleware;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

/**
 * The two modes available are
 * OutputBufferingMiddleware::APPEND (default mode) - Appends to existing response body
 * OutputBufferingMiddleware::PREPEND - Creates entirely new response body
 */
$mode = OutputBufferingMiddleware::APPEND;
$outputBufferingMiddleware = new OutputBufferingMiddleware($mode);

// ...

$app->run();