The core section covers everything involved in handling an HTTP request — from the moment an URL is matched to the moment a response is sent.
If you're new here, start with the lifecycle page to understand the full picture, then dive into whichever piece you need.
Router::init() through middleware, controller, view, and Response::send(); read this first#[Route], URL parameters, named routes, HTTP methods, and middleware assignmentAbstractController, rendering views, returning JSON, using redirect helpersAbstractView, the show() method, sub-views, the layout system, and template cachingMiddlewareAll, MiddlewareAny, MiddlewareCustom, built-in middleware, and writing your ownRedirectTrait, passing data between requests, and form data persistencePHP_SF\System\Kernel and App\Kernel coexist, bootstrap order, and which one owns whatApp\Http\SymfonyControllers alongside framework controllers, Nelmio API doc setup