To check that the application works, first start it running, using PHP's built-in web server, on port 8888, by running the command below. When the object passes the outermost middleware, it is turned into a raw HTTP response and then returned to the client. Once the request object reaches the Slim application, the relevant route is dispatched, resulting in a response object exiting the concentric layers from the inside out. The request enters the outermost middleware, then moves on to the next outermost middleware, continuing until it reaches the application.įor this reason, to catch any errors in the application, you call $app->addErrorMiddleware(true, true, true) last, otherwise any errors thrown from the other middlewares will not be caught. This concentric architecture means that when the Slim application is started, the request object passes through a series of middleware classes, or layers, working from the outside inward.
This is a series of concentric layers that encircle the core application, such that the last middleware added will be the first to be executed. The Slim middleware architecture is derived from the PSR-15 middleware interface. It then instantiates the app and attaches three middleware classes to it. The generated PHP applications allow your users to view, edit, search, add and delete records. The code above begins by bringing in all the PSR-7 components that the app needs. PHP Maker is a powerful automation tool for generating PHP web applications from your database. In a Slim application, each route invokes a callback function that returns an HTTP response object.
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