This document discusses WordPress 3.0 and the new features it includes. WordPress 3.0 allows for custom post types and taxonomies, improved theme customization options like custom headers and menus, and better integration of WordPress Multisite. It was downloaded over 12 million times in its first 9 weeks and aims to make WordPress a full content management system while maintaining its ease of use, performance, and scalability.

1. WordPress 3.0Andrew NacinWordPress Core Developertwitter @nacinweb andrewnacin.comemail andrewnacin@gmail.com

2. Make sure WP_CACHE is true. Props nacin.

3. PHP 5.22011 Q2WordPress 3.2

4. In nine weeks,WordPress 3.0was downloaded12,654,147 timeshttp://wordpress.org/download/counter/

5. WordPresspowers8.5 percent of the webAcquia

6. WordPressis a CMS

7. Custompost typesCustomtaxonomiesTheme developmentThe mergeof WPMUWhy WordPress is a CMS3.0

8. Custompost typesCustomtaxonomiesTheme developmentThe mergeof WPMUWhy WordPress is a CMS

9. blogsite

10. a post type isacontent type

11. What can post types be used for?Everything.

12. Core post typesPostsPagesAttachmentsRevisionsMenu Items

13. They are your content and storage.BlogArticlesNews ReleasesPortfolioProductsNewsletterEventsTweetsEmployeesMy Reading ListDocumentationForumsMenu ItemsUploadsLoggingRevisions

14. Why?Some use cases are obvious.Articles, Newsletters, Portfolio, EventsSome are not.Logging, Menu items

15. Leverage what WordPressdoes bestPerformanceNo direct queriesUtilize cachingExtremely lightScalabilityEaseFull APIFull admin UIUse existing featuresWhy reinvent the wheel?

16. Leverage existing featuresWhat can posts have?Title, content, excerptAuthorCategories, tagsRevisionsComments, PingbacksThumbnailsAttachmentsCustom fields (meta)What can you leverage?TemplatingURL RewritingWP_QueryCapabilitiesAdmin UI, meta boxesFeeds

17. Let’s put it togetheradd_action( 'init', 'my_employees_init' );function my_employees_init() {register_post_type( 'my_employee', array('labels' => array('name' => 'Employees','singular_name' => 'Employee' ),'public' => true,'show_ui' => true,'rewrite' => array( 'slug' => 'team' ),'query_var' => 'team','hierarchical' => false,'supports' => array( 'title', 'thumbnail', 'editor', 'excerpt' ), ) );}

18. What’s it look like?

19. Editing me

20. Let’s create a quick templatequery_posts( array('post_type' => 'my_employee') );if ( have_posts() ) :while ( have_posts() ) :the_post();echo '<h2><a href="' . get_permalink() . '">' .get_the_title() . '</a></h2>';the_post_thumbnail();the_content();echo '<p>Read posts by ';the_author_posts_link();echo '</p>';endwhile; endif;

21. Done./team//team/andrew-nacin//blog/author/andrew-nacin/(excuse my CSS)

22. Custom taxonomiesdescribe your content.

23. Core taxonomiesPost TagsCategoriesLink CategoriesMenus

24. They describe your content.The difference between tags and categories is hierarchy.TopicsPeopleCitiesCitiesContent: Travel blogCuisineContent: RestaurantsSongsContent: ConcertsActors, Directors, ProducersContent: Movies

25. Custom taxonomies are not newDatabase schema — WP 2.3, Sept. 2007Custom taxonomies — WP 2.5, March 2008Partial UI — WP 2.8, June 2009In WP 3.0 — full custom UI implementationSo basically, they’re now on steroids.

26. Specialties taxonomyregister_taxonomy( 'my_specialties', 'nacin_employee', array('labels' => array('name' => 'Specialties', 'singular_name' => 'Specialty' ),'public' => true,'show_ui' => true,'query_var' => false,'rewrite' => false,'hierarchical' => false,) );

27. Edit screen

28. 'hierarchical' => 'false'

29. 'hierarchical' => 'true'

30. WordPress 3.0 makestheme development and customizations easier.

31. Admin UI screenshot

33. How?In our themefunctions.php:function my_theme_setup() {add_custom_background();}add_action( 'after_setup_theme', 'my_theme_setup' );1234

35. function my_theme_setup() {add_custom_background();define( 'NO_HEADER_TEXT', true );define( 'HEADER_IMAGE_WIDTH', 940 );define( 'HEADER_IMAGE_HEIGHT', 198 );define( 'HEADER_IMAGE', '%s/images/default.jpg' );add_custom_header( 'my_theme_header_style', 'my_theme_admin_header_style' );register_default_header( array( 'default' => array( 'url' => '%s/images/default.jpg', 'thumbnail_url' => '%s/images/default-thumb.jpg','description' => 'Default Header' ), ) );}add_action( 'after_setup_theme', 'my_theme_setup' );2345678910111213

36. Custom Header, cont.function my_theme_admin_header_style() {echo '#headimg { height: ' . HEADER_IMAGE_HEIGHT . 'px; width: ' . HEADER_IMAGE_WIDTH . 'px; }';}function my_theme_header_style() {echo '#header { background-image: url(' . header_image() . '); }';}123456

37. MenusScreenshot of menu admin

38. In our themefunctions.php:function my_theme_setup() {add_custom_background();add_custom_header( 'my_theme_header_style', 'my_theme_admin_header_style' ); // ...register_nav_menu('header', 'Primary Navigation');}add_action( 'after_setup_theme', 'my_theme_setup' );In our theme header.php:wp_nav_menu( array( 'theme_location' => 'header' ) );1234567

39. MenusScreenshot of menus in Twenty Ten

40. Evolving Theme Developmentget_template_part()It’s basicallyinclude()on steroids.Example:get_template_part('loop', 'archive');Process:Check for loop-archive.php. Check the child theme first, if applicable.Otherwise, check for loop.php.Less Redundancy FTW.

41. get_template_part('header', 'home');Is like calling:get_header( 'home' );Same deal: header-home.php,then header.php.

42. What’s with thetheme improvements?In 3.0, we weretheme developers.

43. Kubrick!

44. Twenty Ten

45. Power one site or 10 million.

46. WordPress MultisiteThe WPMU fork was mergedMassive merge sprint, followed by cleanupTerminology/concept nightmareTODO: Network admin UI improvementsTODO: Easier to manage, use, and install (in that order

47. Oh no, please don’t.define( 'WP_ALLOW_MULTISITE', true );

48. Only if you insist.

50. A new Network AdminNew MU screen

51. Other cool featuresPick a username/password during installcomment_form() and wp_login_form()Stronger authentication security by defaultBulk update plugins and themes“Search Engines Blocked”Rewritten initialization code

52. Follow along#wordpress-dev on freenode.nethttp://wpdevel.wordpress.comhttp://core.trac.wordpress.orgwp-svn– mailing list for commitswp-hackers – plugin and core developerswp-testers

53. What might be nextColumn sorting and a more AJAX feelMore features for custom post types and custom taxonomiesSupport for custom comment typesBetter support for custom post statusesMedia/upload overhaulIncremental admin, DRY, UX changesIncremental improvements to multisiteLinks as a post typeRoles/capabilities overhaul

54. Our philosophies.codex.wordpress.org/Release_Philosophy

55. Decisions, not options.

56. Preferences have a cost.Too many means you can't find any of them.They damage QA and testing.They make good UI difficult.They confuse users.Do something specific and do it well.Defaults that work will lead the UI in the right direction.

57. The quality of an interface design is inversely proportional to the number of designers.

58. If you're too lazy to do the homework and think through the big-picture rationale, I'm too lazy to add the feature.

59. In the presence of good rationale, maintainers should be willing to change their mind often.

60. Let’s talk security.

61. QualysBlindElephantBlindElephantis a web application fingerprinter.Drupal, Joomla!, Liferay, Mediawiki, Moodle, MovableType, osCommerce, phpBB, phpMyAdmin, phpNuke, SPIP, WordPress

62. 96 percentJOOMLA 1.5.20Versions < 1.0.15 and < 1.5.17 are critically insecure. Version 1.5.17 was released 3 months ago.Percentage of installs running a critically insecure version?

63. 69 percent (and up)DRUPAL 6.19Versions < 5.22 and < 6.16 are critically insecure. Version 6.16 was released in March. Versions 6.18 and 5.23 were critical security fixes released last week.Percentage of installs running a critically insecure version?

64. 4 percentWORDPRESS 3.0.1Versions < 2.5.1 are critically insecure. (Released in April 2008.)Versions < 2.8.3 are insecure. (August 2009.)Percentage of installs running a critically insecure version?

65. Shared hosts suck.

66. security@wordpress.org

67. pre-release candidates for 3.0 were downloaded 75,000timesQUALITY ASSURANCE

68. Questions?twitter @nacinweb andrewnacin.comemail andrewnacin@gmail.com