MidwestPHP Symfony2 Internals

1. Symfony2 Internals Raúl Fraile

2. Who am I?

3. Raúl Fraile • Software developer at • I live in Spain • PHP 5.3 Zend Certiﬁed Engineer • Symfony Certiﬁed Developer • Symfony2 lover ❤ • LadybugPHP: Simple and extensible PHP dumper • Future dad ☺ @raulfraile

4. Should I care about Symfony2 internals?

6. Yes!

8. http://xkcd.com/676/

9. Topics

10. 1. Symfony2 components 2. Composer 3. Autoloading & PSR-0 4. Request & Response 5. Demo 1 6. Symfony2 full-stack framework 7. Events 8. Demo 2

11. Components

12. Set of decoupled and standalone libraries

13. Implement common features needed to develop websites

14. The foundation of the Symfony2 full-stack framework

15. BrowserKit Finder Security ClassLoader Form Serializer Conﬁg HttpFoundation Templating Console HttpKernel Translation CssSelector Locale Validator DependencyInjection Process Yaml DomCrawler OptionsResolver EventDispatcher Routing

16. BrowserKit Finder Security ClassLoader Form Serializer Conﬁg HttpFoundation Templating Console HttpKernel Translation CssSelector Locale Validator DependencyInjection Process Yaml DomCrawler OptionsResolver PropertyAccess 2.2.0 EventDispatcher Routing StopWatch

17. Who’s using them?

18. Components demo...

19. ... after some concepts

20. Composer

22. Composer is a dependency manager for PHP

23. { "require": { "symfony/http-foundation": "v2.2.0", "doctrine/orm": ">=2.2.3", } }

24. $ composer install

25. Autoload

26. Triggered whenever we need a class or interface not already deﬁned

27. Fully Qualified Name (FQN) File

28. Fully Qualified Name (FQN) ∖Doctrine∖DBAL∖Driver File

29. Fully Qualified Name (FQN) ∖Doctrine∖DBAL∖Driver [lib_path]/Doctrine/DBAL/Driver.php File

30. Fully Qualified Name (FQN) ∖Doctrine∖DBAL∖Driver ∖Twig_Lexer [lib_path]/Doctrine/DBAL/Driver.php File

31. Fully Qualified Name (FQN) ∖Doctrine∖DBAL∖Driver ∖Twig_Lexer [lib_path]/Doctrine/DBAL/Driver.php [lib_path]/Twig/Lexer.php File

32. bool spl_autoload_register( [callable $autoload_function, [bool $throw = true, [bool $prepend = false]]] )

33. <?php include_once(__DIR__.'/MyLoader.php'); include_once(__DIR__.'/vendor/Twitter/Loader.php'); spl_autoload_register(array('MyLoader', 'autoload')); spl_autoload_register(array('Loader', 'autoload')); $tweet = new Tweet(); // vendor/Twitter/Tweet.php $book = new MyBook(); // classes/My/Book.php

34. <?php include_once(__DIR__.'/MyLoader.php'); include_once(__DIR__.'/vendor/Twitter/Loader.php'); spl_autoload_register(array('MyLoader', 'autoload')); spl_autoload_register(array('Loader', 'autoload')); $tweet = new Tweet(); // vendor/Twitter/Tweet.php $book = new MyBook(); // classes/My/Book.php new Tweet()

35. <?php include_once(__DIR__.'/MyLoader.php'); include_once(__DIR__.'/vendor/Twitter/Loader.php'); spl_autoload_register(array('MyLoader', 'autoload')); spl_autoload_register(array('Loader', 'autoload')); $tweet = new Tweet(); // vendor/Twitter/Tweet.php $book = new MyBook(); // classes/My/Book.php new Tweet() MyLoader::autoload(‘Tweet’)

36. <?php include_once(__DIR__.'/MyLoader.php'); include_once(__DIR__.'/vendor/Twitter/Loader.php'); spl_autoload_register(array('MyLoader', 'autoload')); spl_autoload_register(array('Loader', 'autoload')); $tweet = new Tweet(); // vendor/Twitter/Tweet.php $book = new MyBook(); // classes/My/Book.php new Tweet() MyLoader::autoload(‘Tweet’) Loader::autoload(‘Tweet’)

37. <?php include_once(__DIR__.'/MyLoader.php'); include_once(__DIR__.'/vendor/Twitter/Loader.php'); spl_autoload_register(array('MyLoader', 'autoload')); spl_autoload_register(array('Loader', 'autoload')); $tweet = new Tweet(); // vendor/Twitter/Tweet.php $book = new MyBook(); // classes/My/Book.php new Tweet() MyLoader::autoload(‘Tweet’) Loader::autoload(‘Tweet’) include __DIR__.’/vendor/Twitter/Tweet.php’

38. This is a mess...

39. ... we need a standard!

40. PSR-0

41. F.I.G Framework Interop Group

42. In summary: 1) ‘/’ and ‘_’ are converted to DIRECTORY_SEPARATOR 2) Sufﬁxed with .php

43. Time for the demo!

44. Request

45. HttpFoundation Component Object Oriented abstraction of an HTTP request

46. http://www.ietf.org/rfc/rfc2616.txt Request = Request-Line *(header CRLF) CRLF [ message-body ]

47. http://www.ietf.org/rfc/rfc2616.txt Request-Line

49. Method

50. SP

71. Request-URI

72. SP

93. HTTP-Version

94. CRLF Request = Request-Line *(header CRLF) CRLF [ message-body ]

95. http://www.ietf.org/rfc/rfc2616.txt Request-Line

97. Method

98. SP

119. Request-URI

120. SP

141. HTTP-Version

142. CRLF Request = Request-Line *(header CRLF) CRLF [ message-body ] General

143. headers:

144. Cache-Control,

145. Transfer-Encoding,

146. Via... Request

147. headers:

148. Accept-Encoding,

149. Accept-Language,

150. If-Match... Entity

151. headers:

152. Content-Encoding,

153. Content-Language,

154. Expires...

155. Hypertext Transfer Protocol GET /index.php HTTP/1.1 Host: test.com Accept-Language:en;q=0.8 Accept-Encoding:gzip User-Agent: Mozilla/5.0

156. Hypertext Transfer Protocol $_GET GET /index.php HTTP/1.1 $_POST Host: test.com Accept-Language:en;q=0.8 $_COOKIE Accept-Encoding:gzip User-Agent: Mozilla/5.0 $_FILES $_SERVER

157. Hypertext Transfer Protocol $_GET query request GET /index.php HTTP/1.1 $_POST cookies Host: test.com ﬁles Accept-Language:en;q=0.8 $_COOKIE server Accept-Encoding:gzip headers User-Agent: Mozilla/5.0 $_FILES getHost getClientIp $_SERVER ...

158. Response

159. HttpFoundation Component Object Oriented abstraction of an HTTP response

160. http://www.ietf.org/rfc/rfc2616.txt Response = Status-Line *(header CRLF) CRLF [ message-body ]

161. http://www.ietf.org/rfc/rfc2616.txt Status-Line

162. =

163. HTTP-Version

164. SP

183. Status-Code

184. SP

203. Reason-Phrase

204. CRLF Response = Status-Line *(header CRLF) CRLF [ message-body ]

205. http://www.ietf.org/rfc/rfc2616.txt Status-Line

206. =

207. HTTP-Version

208. SP

227. Status-Code

228. SP

247. Reason-Phrase

248. CRLF Response = Status-Line *(header CRLF) CRLF [ message-body ] General

249. headers:

250. Cache-Control,

251. Pragma,

252. Via... Response

253. headers:

254. ETag,

255. Vary,

256. WWW-Authenticate... Entity

257. headers:

258. Content-Encoding,

259. Content-Language,

260. Expires...

261. Headers Version Content Status code Status text Charset ...

262. Hypertext Transfer Protocol Headers HTTP/1.1 200 OK Version Content-type: text/html Date:Sun, 3 Mar 2013 07:10:42 GMT Content Status code !DOCTYPE HTML Status text html lang=es head Charset meta charset=utf-8 ... ...

263. Symfony2 full-stack framework

264. Components Vendors + ➕ Bundles Bridges --------------------- Full-stack

265. framework

266. Vendors

267. Project dependencies (third party libraries)

268. Doctrine, Twig, Assetic, Monolog and SwiftMailer

269. Doctrine, Twig, Assetic, Monolog and SwiftMailer don’t

270. reinvent

271. the

272. wheel, these

273. libraries

274. are

275. awesome!

276. Bundles

277. “A bundle is a directory that has a well-deﬁned structure and can host anything from classes to controllers and web resources.” Source: symfony.com

278. FrameworkBundle SecurityBundle TwigBundle WebProﬁlerBundle AsseticBundle MonologBundle SwiftmailerBundle

279. Bridges

280. Extend components and libraries to be used in Symfony2

281. Example: The Twig Bridge adds useful functions to use forms, routing, security and translations.

282. Example: The Twig Bridge adds useful functions to use forms, routing, security and form_enctype translations. form_widget form_errors form_label form_row form_rest csrf_token

283. Example: The Twig Bridge adds useful functions to use forms, routing, security and form_enctype url translations. form_widget path form_errors form_label form_row form_rest csrf_token

284. Example: The Twig Bridge adds useful functions to use forms, routing, security and form_enctype url translations. is_granted form_widget path form_errors form_label form_row form_rest csrf_token

285. Example: The Twig Bridge adds useful functions to use forms, routing, security and form_enctype url translations. is_granted form_widget path trans form_errors transchoice form_label form_row form_rest csrf_token

286. Events

287. EventDispatcher Component

288. Mediator pattern: decouple a Producer from a Consumer Consumer Producer Consumer Consumer

289. Mediator pattern: decouple a Producer from a Consumer Consumer Producer Mediator Consumer Consumer

290. Mediator pattern: decouple a Producer from a Consumer Consumer Producer Mediator Consumer Consumer addListener() dispatch()

291. Mediator pattern: decouple a Producer from a Consumer Consumer Producer Mediator Consumer Consumer addListener() dispatch() http://goo.gl/Fr16Z Mediators - Programming With Anthony

292. kernel.request

293. Dispatched as soon as the request arrives

294. If any listener return a Response object, all other listeners won't be called.

295. Used by FrameworkBundle to populate the _controller value

296. kernel.controller

297. Once the controller is resolved, this event is dispatched

298. kernel.view

299. Called only if the controller does not return a Response

300. Goal: build a Response object from the return value of the Controller

301. kernel.response

302. Allow to modify or replace the Response object after its creation

303. Allow to modify or replace the Response object after its creation i.e.

304. adding

305. the

306. Google

307. Analytics

308. tracker

309. code?

310. Allow to modify or replace the Response object after its creation i.e.

311. adding

312. the

313. Google

314. Analytics

315. tracker

316. code? You

317. could...

318. but

319. there

320. are

321. better

322. ways

323. ☺

324. kernel.terminate

325. Called once the Response has been sent

326. Used to run expensive post-response jobs

327. Used to run expensive post-response jobs i.e.

328. sending

329. emails,

330. processing

331. data...

332. kernel.exception

333. Last chance to convert an Exception into a Response object

334. Events demo

335. Thank you! Questions? https://joind.in/8225

336. Photos: http://www.ﬂickr.com/photos/wavetraced/384824309/

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