Symfony Controllers

Overview

A controller is a PHP callable you create that takes information from the HTTP request and constructs and returns an HTTP response (as a Symfony Response object).

Requests, Controller, Response Lifecycle

Every request handled by a Symfony project goes through the same simple lifecycle. The framework takes care of all the repetitive stuff: you just need to write your custom code in the controller function:

• Each request is handled by a single front controller file (e.g. app.php or app_dev.php) that bootstraps the application;
• The Router reads information from the request (e.g. the URI), finds a route that matches that information, and reads the _controller parameter from the route;
• The controller from the matched route is executed and the code inside the controller creates and returns a Response object;
• The HTTP headers and content of the Response object are sent back to the client.