Symfony is a set of reusable and decoupled PHP components designed to solve common web development problems. While as a framework it might not be the best for some of your projects, you can always build on top of its solid foundation of well written, tested and flexible components. Original presentation: https://docs.google.com/presentation/pub?id=136blt1DWJ95yuEdpmjz9dIqgg38VwEXBQlY7bu0Op8w&start=false&loop=false&delayms=3000

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