Key aspects of the road from a request to a response in Symfony2.

1. Request to Response

2. Key points
● webserver
● front controller
● Kernel
● Events & Listeners
● Controller

3. let’s visualize

4. webserver
● apache
○ htaccess
○ mod_rewrite
● ex :
php composer.phar create-project symfony/framework-standard-edition /path/to/workshop-symfony 2.5.*
cd /path/to/workshop-symfony
php -S localhost:8080 -t web

5. ● app.php vs app_dev.php
● bootstrapping [require_once __DIR__.'/../app/bootstrap.php.cache';]
● autoloading [require_once __DIR__.'/./autoload.php';]
● create Request object [$request = Request::createFromGlobals();]
● handle & send response
entry point

6. AppKernel :
● init container
● init bundles
HttpKernel :
● transform Request
to Response [handle()]
Kernel(s)
HttpKernel
AppKernel
AppCache

7. ● EventDispatcher Component
Events & Listener

8. ● kernel.request
● kernel.controller
● kernel.view ( when no-response)
● kernel.response
● kernel.finish_request (when response should not modify)
● kernel.terminate (heavy duty stuff)
● kernel.exception (obvious)
Main events

11. ● dispatched as soon as a request arrives
● add information to the request, initialize parts of the
system, return response if possible
● if any listener returns response the others are not called
● ex : routing, firewall, locale
kernel.request

12. ● add version information to request
● some routes should not be available in version 2 -
redirect to some page
kernel.request - todo

15. ● dispatched after the controller is determined
● initialize things, change the controller before executing
● ex : param converter, info collecting
kernel.controller

16. ● handle a preExecute() function on all controllers
kernel.controller - todo

19. ● dispatched after we have a response
● modify the response object just before it is sent
● ex : context, webdebug
kernel.response

20. ● add an extra header on some routes
● change the title of the page
kernel.response - todo

21. That’s all folks