docs(articles): English translation of From Magento to Symfony
en/articles/magento-to-symfony/basics/lifecycle.md
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The life of a request
In Magento a request goes through the FrontController, the router list and the action's execute(). In Symfony HttpKernel follows the same path, but every step is an event anyone can subscribe to: routing, security, argument conversion, exception handling. Understand this diagram, and most of Symfony's "magic" becomes ordinary event listeners.
public/index.php
→ Kernel::handle(Request)
→ kernel.request RouterListener finds the route, then Firewall: who the user is
→ kernel.controller
→ ArgumentResolver Request, entities, DTOs
→ Controller
returned a Response → kernel.response
returned a non-Response → kernel.view → kernel.response
threw an exception → kernel.exception → kernel.response
→ Response::send()
→ kernel.terminate
| Symfony step | Closest in Magento | What happens there |
|---|---|---|
| public/index.php, Kernel | pub/index.php, Bootstrap, App\Http::launch() | Loading the compiled container. |
| kernel.request: RouterListener (priority 32) | FrontController::dispatch(), RouterList::match() | The route is written into the Request attributes. |
| kernel.request: Firewall (priority 8) | area + session, admin authentication plugin | Authentication, the user token. |
| kernel.controller | controller_action_predispatch, plugins on dispatch() | This is where #[IsGranted], #[Cache] fire. |
| ArgumentResolver | none; getParam() by hand | An entity by id, a DTO from JSON, the current user. |
| Controller | ActionInterface::execute() | Your code. |
| kernel.view | none | Turning a non-Response into a Response, e.g. #[Template]. |
| kernel.response | controller_front_send_response_before | Headers, cookies, the Web Profiler toolbar. |
| kernel.terminate | none | Work after the response is sent: logs, emails. |
| kernel.exception | ExceptionHandler, noroute | 404/403/500, error pages. |
To see all listeners and their priorities: bin/console debug:event-dispatcher kernel.request.