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Symfony2 – Franz Jordán 2011 The front controller's only job is to initialize Symfony2's engine (Kernel) and pass it a Request object to handle. Symfony2's core then uses the routing map to determine which controller to call. Just like before, the controller method is responsible for returning the final Response object. There's really not much else to it. For a visual representation of how Symfony2 handles each request, see the request flow diagram. Where Symfony2 Delivers In the upcoming chapters, you'll learn more about how each piece of Symfony works and the recommended organization of a project. For now, let's see how migrating the blog from flat PHP to Symfony2 has improved life: Your application now has clear and consistently organized code (though Symfony doesn't force you into this). This promotes reusability and allows for new developers to be productive in your project more quickly. 100% of the code you write is for your application. You don't need to develop or maintain low-level utilities such as autoloading, routing, or rendering controllers. Symfony2 gives you access to open source tools such as Doctrine and the Templating, Security, Form, Validation and Translation components (to name a few). The application now enjoys fully-flexible URLs thanks to the Routing component. Symfony2's HTTP-centric architecture gives you access to powerful tools such as HTTP caching powered by Symfony2's internal HTTP cache or more powerful tools such asVarnish. This is covered in a later chapter all about caching. And perhaps best of all, by using Symfony2, you now have access to a whole set of high-quality open source tools developed by the Symfony2 community! For more information, check outSymfony2Bundles.org Better templates If you choose to use it, Symfony2 comes standard with a templating engine called Twig that makes templates faster to write and easier to read. It means that the sample application could contain even less code! Take, for example, the list template written in Twig: {# src/Acme/BlogBundle/Resources/views/Blog/list.html.twig #} {% extends "::layout.html.twig" %} {% block title %}List of Posts{% endblock %} {% block body %} List of Posts {% for post in posts %} 28
Symfony2 – Franz Jordán 2011 {{ post.title }} {% endfor %} {% endblock %} The corresponding layout.html.twig template is also easier to write: {# app/Resources/views/layout.html.twig #} {% block title %}Default title{% endblock %} {% block body %}{% endblock %} Twig is well-supported in Symfony2. And while PHP templates will always be supported in Symfony2, we'll continue to discuss the many advantages of Twig. For more information, see the templating chapter. Learn more from the Cookbook How to use PHP instead of Twig for Templates How to define Controllers as Services Installing and Configuring Symfony 29
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