1. Symfony
components in
the wild
Jakub Zalas

2. Who am I?
o Remembers symfony 1.0
(2007)
o Open Source contributor
o BDD advocate
o Works at Sensio Labs UK
o ZCE & Sensio Labs o Twitter: @jakub_zalas
Certi"ed Symfony o Blog: http://zalas.eu
Developer
o Github: @jakzal

3. What is Symfony?
First, Symfony2 is a reusable set
of standalone, decoupled, and cohesive
PHP components
that solve common web development problems.
Then, based on these components,
Symfony2 is also a full-stack web framework.
http://www.sxc.hu/photo/1197009 http://fabien.potencier.org/article/49/what-is-symfony2

4. Why does it matter?
* 76% of statistics found on the Internet is made up
http://www.sxc.hu/photo/1223174

5. Reinventing the wheel
http://flic.kr/p/Mu9m2

6. Maintenance hell
http://www.sxc.hu/photo/1005333

7. Symfony components
HttpFoundation
Console
Validator
Form
Routing
HttpKernel
OptionsResolver
CssSelector
DependencyInjection
BrowserKit
DomCrawler
Translation
EventDispatcher
Security
Locale
Templating
Filesystem
Con"g
Process
Finder
ClassLoader
Yaml
Serializer
http://www.sxc.hu/photo/338038

9. HttpFoundation
http://www.sxc.hu/photo/1212545

10. use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
$request = Request::createFromGlobals();
$name = $request->query->get('name', 'PHPNW');
$message = "Hello $name!";
$response = new Response($message, 200);
$response->headers->set('X-REQUEST-NAME', $name);
$response->headers->setCookie(new Cookie('phpnw', $name));
$response->send();

11. use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
$request = Request::createFromGlobals();
$name = $request->query->get('name', 'PHPNW');
$message = "Hello $name!";
$request->request
$response = new Response($message, 200);
$request->query
$response->headers->set('X-REQUEST-NAME', $name);
$request->server
$response->headers->setCookie(new Cookie('phpnw', $name));
$request->files
$response->send();
$request->cookies
$request->headers
$request->attributes

12. $request = Request::createFromGlobals();
$session = $request->getSession();
if ($session->has('referrer')) {
$referrer = $session->get('referrer');
return new RedirectResponse($referrer);
}
if ($session->hasFlash('notice')) {
return new Response($session->getFlash('notice'));
} else {
$session->setFlash('notice', 'Hello again!');
return new Response('Foo')
}

13. $request = Request::createFromGlobals();
$date = getPageUpdatedAtById($request->query->get('id'));
$response = new Response();
$response->setPublic();
$response->setLastModified($date);
if ($response->isNotModified($request)) {
return $response;
}
// else do heavy processing to render the page

14. How to check if a request is made over ssl?
• is there HTTPS in the server vars? is it 'on' or '1'?
• or is there SSL_HTTPS header? is it 'on' or '1'?
• or is there X_FORWARDED_PROTO header set to 'https'
if ($request->isSecure()) {
// we're fine
}

15. Routing
http://www.sxc.hu/photo/1070609

16. use SymfonyComponentRoutingRouteCollection;
use SymfonyComponentRoutingRoute;
$routes = new RouteCollection();
$routes->add('hello', new Route('/hello/{name}', array(
'controller' => 'HelloController'
)));
$routes->add('homepage', new Route('/', array(
'controller' => 'HomepageController'
)));

17. use SymfonyComponentRoutingMatcherUrlMatcher;
use SymfonyComponentRoutingRequestContext;
$matcher = new UrlMatcher($routes, new RequestContext());
$parameters = $matcher->match('/');
var_dump($parameters);
// array(
// 'controller' => 'HomepageController',
// '_route' => 'homepage'
// )

18. use SymfonyComponentRoutingMatcherUrlMatcher;
use SymfonyComponentRoutingRequestContext;
$matcher = new UrlMatcher($routes, new RequestContext());
$parameters = $matcher->match('/hello/PHPNW');
var_dump($parameters);
// array(
// 'controller' => 'HelloController',
// 'name' => 'PHPNW',
// '_route' => 'hello'
// )

19. use SymfonyComponentRoutingMatcherUrlMatcher;
use SymfonyComponentRoutingRequestContext;
$routes->add('hello', new Route('/hello/{name}', array(
$matcher = new UrlMatcher($routes, new RequestContext());
'controller' => 'HelloController'
)));
$parameters = $matcher->match('/hello/PHPNW');
var_dump($parameters);
// array(
// 'controller' => 'HelloController',
// 'name' => 'PHPNW',
// '_route' => 'hello'
// )

20. $routes = new RouteCollection();
$routes->add('hello', new Route(
'/hello/{name}',
array('controller' => 'HelloController'),
array('name' => '^[a-zA-Z]+$')
));
$matcher = new UrlMatcher($routes, new RequestContext());
$parameters = $matcher->match('/hello/PHPNW');
var_dump($parameters);
// array(
// 'controller' => 'HelloController',
// 'name' => 'PHPNW',
// '_route' => 'hello'
// )

21. use SymfonyComponentRoutingException;
$routes = new RouteCollection();
$routes->add('hello', new Route(
'/hello/{name}',
array('controller' => 'HelloController'),
array('name' => '^[a-zA-Z]+$')
));
$matcher = new UrlMatcher($routes, new RequestContext());
try {
$matcher->match('/hello/PHPNW12');
} catch (ExceptionResourceNotFoundException $exception) {
die('Resource not found');
}

22. use SymfonyComponentRoutingGeneratorUrlGenerator;
$generator = new UrlGenerator(
$routes, new RequestContext()
);
// "/hello/PHPNW"
$url = $generator->generate(
'hello', array('name' => 'PHPNW')
);
// "http://localhost/hello/PHPNW"
$url = $generator->generate(
'hello', array('name' => 'PHPNW'), true
);

23. EventDispatcher
http://www.sxc.hu/photo/715294

24. use SymfonyComponentEventDispatcherEventDispatcher;
use SymfonyComponentEventDispatcherEvent;
$dispatcher = new EventDispatcher();
$dispatcher->addListener(
'received_hello',
function (Event $event) {
printf("Hello from listener 1!n");
}
);
$dispatcher->addListener(
'received_hello',
function (Event $event) {
printf("Hello from listener 2!n");
}
);

25. printf("Hello!n");
$dispatcher->dispatch('received_hello', new Event());
Hello!
Hello from listener 1!
Hello from listener 2!

26. $dispatcher = new EventDispatcher();
$dispatcher->addListener(
'received_hello',
function (Event $event) {
printf("Hello from listener 1!n");
},
0
);
$dispatcher->addListener(
'received_hello',
function (Event $event) {
printf("Hello from listener 2!n");
},
10
);

27. printf("Hello!n");
$dispatcher->dispatch('received_hello', new Event());
Hello!
Hello from listener 2!
Hello from listener 1!

28. $dispatcher = new EventDispatcher();
$dispatcher->addListener(
'received_hello',
function (Event $event) {
printf("Hello from listener 1!n");
$event->stopPropagation();
}
);
$dispatcher->addListener(
'received_hello',
function (Event $event) {
printf("Hello from listener 2!n");
}
);

29. printf("Hello!n");
$dispatcher->dispatch('received_hello', new Event());
Hello!
Hello from listener 1!

30. $app = new SilexApplication();
$app->after(
function (Request $request, Response $response) {
// http://phpnw.dev/?hello=1
if ($request->query->get('hello') === '1') {
$content = str_replace(
'</body>',
'Hello!!</body>',
$response->getContent()
);
$response->setContent($content);
}
}
);

31. // Silex/src/Silex/Application.php:304
public function after($callback, $priority = 0)
{
$this['dispatcher']->addListener(
SilexEvents::AFTER,
function (FilterResponseEvent $event)
use ($callback) {
call_user_func(
$callback,
$event->getRequest(),
$event->getResponse()
);
},
$priority
);
}

32. // Silex/src/Silex/Application.php:603
$this['dispatcher']->dispatch(SilexEvents::AFTER, $event);

33. HttpKernel
http://www.sxc.hu/photo/835732

34. $resolver = new ControllerResolver();
$httpKernel = new HttpKernel($dispatcher, $resolver);
$request = Request::create('/hello/PHPNW')
$response = $httpKernel->handle($request);
echo $response;
HTTP/1.0 200 OK
Cache-Control: no-cache
Date: Sat, 06 Oct 2012 14:32:14 GMT
Hello PHPNW

35. $matcher = new UrlMatcher($routes, new RequestContext());
$dispatcher = new EventDispatcher();
$dispatcher->addListener(
KernelEvents::REQUEST,
function (GetResponseEvent $event) use ($matcher) {
$request = $event->getRequest();
$pathInfo = $request->getPathInfo();
// array contains '_controler', 'name', '_route'
$parameters = $matcher->match($pathInfo);
$request->attributes->add($parameters);
}
);

36. use SymfonyComponentRoutingRouteCollection;
use SymfonyComponentRoutingRoute;
$routes = new RouteCollection();
$routes->add('hello', new Route('/hello/{name}', array(
'_controller' => 'PhpnwController::hello'
)));
$routes->add('homepage', new Route('/', array(
'_controller' => 'PhpnwController::homepage'
)));

37. use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
class PhpnwController
{
public function hello(Request $request, $name)
{
return new Response('Hello '.$name.PHP_EOL);
}
public function homepage(Request $request)
{
return new Response('Home sweet home'.PHP_EOL);
}
}

38. $response = $httpKernel->handle(Request::create('/bye'));
PHP Fatal error: Uncaught exception 'SymfonyComponent
RoutingExceptionResourceNotFoundException' in /home/
vagrant/Projects/WildComponents/vendor/symfony/routing/
Symfony/Component/Routing/Matcher/UrlMatcher.php:81

39. $dispatcher->addListener(
KernelEvents::EXCEPTION,
function (GetResponseForExceptionEvent $event) {
$message = $event->getException()->getMessage();
$response = new Response($message, 404);
$event->setResponse($response);
}
);
HTTP/1.0 404 Not Found
Cache-Control: no-cache
Date: Sat, 06 Oct 2012 09:01:02 GMT
Unable to find the controller for path "/bye".
Maybe you forgot to add the matching route in
your routing configuration?

40. Console
http://www.sxc.hu/photo/910912

41. use SymfonyComponentConsoleCommandCommand;
use SymfonyComponentConsoleInputInputInterface;
use SymfonyComponentConsoleOutputOutputInterface;
class HelloCommand extends Command
{
public function configure()
{
// configure the command [...]
}
protected function execute(InputInterface $input,
OutputInterface $output)
{
// put your code here [...]
}
}

42. public function configure()
{
$this->setDescription('Outputs welcome message[...]');
$this->setHelp('Outputs welcome message.');
$this->addArgument(
'name',
InputArgument::OPTIONAL,
'The name to output to the screen',
'World'
);
}

43. $application = new Application('Demo', '1.0.0');
$application->add(new HelloCommand('hello'));
$application->run();

45. protected function execute(InputInterface $input,
OutputInterface $output)
{
$name = $input->getArgument('name');
$output->writeln(sprintf('Hello %s!', $name));
}
}

46. public function configure()
{
// [...]
$this->addOption(
'more',
'm',
InputOption::VALUE_NONE,
'Tell me more'
);
}

47. protected function execute(InputInterface $input,
OutputInterface $output)
{
$name = $input->getArgument('name');
$output->writeln(sprintf('Hello %s!', $name));
if ($input->getOption('more')) {
$output->writeln('It is really nice to meet
you!');
}
}
}

49. How to start?
// composer.json
{
"require": {
"symfony/http-foundation": "2.1.2"
}
}
curl -s https://getcomposer.org/installer | php
php composer.phar install
http://www.sxc.hu/photo/1092493

50. Why Symfony?
• Good code covered by tests
• Flexible
• Secure
• Stable API (@api annotation)
• Long term support
• Outstanding community
• Wide adoption

51. Thank you!
Rate my talk:
https://joind.in/6945
Interested in training?
We're introducing Symfony Components trainings soon:
http://www.sensiolabs.co.uk/training/symfony2.html