Upgrade Guide
最后更新于：2022-04-01 04:24:12
# Upgrade Guide
If you are upgrading from version 2 to version 3, these are the significant changes that you need to be aware of.
# Removal of Stop/Halt
Slim Core has removed Stop/Halt. In your applications, you should transition to using the withStatus() and withBody()
Example In Slim 2.x:
~~~
$app->get('/', function () { $app->halt(400, 'Bad Request'); });
~~~
And now in Slim 3.x:
~~~
$app->get('/', function ($req, $res, $args) {
return $res->withStatus(400)->write('Bad Request');
});
~~~
# Hooks
Slim v3 no longer has the concept of hooks. Hooks were removed as they duplicate the functionality already present in middlewares. You should be able to easily convert your Hook code into Middleware code.
# Removal HTTP Cache
In Slim v3 we have removed the HTTP-Caching into its own module Slim\Http\Cache ( https://github.com/slimphp/Slim-HttpCache )
# Changed Redirect
In Slim v2.x one would use the helper function $app->redirect(); to trigger a redirect request. In Slim v3.x one can do the same with using the Response class like so.
Example:
~~~
$app->get('/', function ($req, $res, $args) {
return $res->withStatus(301)->withHeader("Location", "yournewuri");
});
~~~
# Middleware
Signature —- The middleware signature has changed from a class to a function New signature:
~~~
$app->add(function ($req, $res, $next) {});
~~~
## Execution
Application middleware is executed as Last In First Executed (LIFE)
# Flash Messages
In v3.0 the concept of flash messages has been removed. There currently is no planned feature for this, but could likely be a part of the Cookies package.
# Cookies
In v3.0 cookies has been removed from core and moved to a separate component. See (https://github.com/slimphp/Slim-Http-Cookies)
# Removal of Crypto
In v3.0 we have removed the dependency for crypto in core.
# PHP Version
Slim v3.0 requires PHP 5.5+
# Route Callbacks
In v3.0 we have adopted a new callback signature:
~~~
$app->get('/', function (
\Psr\Http\Message\ServerRequestInterface $request,
\Psr\Http\Message\ResponseInterface $response,
array $args = null) {
//do stuff!
});
~~~
# New Router
Slim now utilizes a new, more powerful router ( https://github.com/nikic/FastRoute )!
# Route Middleware
The syntax for adding route middleware has changed slightly. In v3.0:
~~~
php $app->get(…)->add($mw2)->add($mw1);
~~~
# urlFor() is now pathfor() in the router
`urlFor()` has been renamed `pathFor()` and can be found in the `router` object:
~~~
$router = $app->router;
$app->get('/', function ($request, $response, $args) use ($router) {
$url = $router->pathFor('home');
$response->write("<a href='$url'>Home</a>");
return $response;
})->setName('home');
~~~
Also, `pathFor()` is base path aware.