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 3.0 Andrew Nacin WordPress Core Developer twitter @nacinweb andrewnacin.com email 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 times http://wordpress.org/download/counter/

5. WordPresspowers8.5 percent of the web Acquia

6. WordPressis a CMS

7. Custompost types Customtaxonomies Theme development The mergeof WPMU Why WordPress is a CMS 3.0

8. Custompost types Customtaxonomies Theme development The mergeof WPMU Why WordPress is a CMS

9. blog site

10. a post type isacontent type

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

12. Core post types Posts Pages Attachments Revisions Menu Items

13. They are your content and storage. Blog Articles News Releases Portfolio Products Newsletter Events Tweets Employees My Reading List Documentation Forums Menu Items Uploads Logging Revisions

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

15. Leverage what WordPressdoes best Performance No direct queries Utilize caching Extremely light Scalability Ease Full API Full admin UI Use existing features Why reinvent the wheel?

16. Leverage existing features What can posts have? Title, content, excerpt Author Categories, tags Revisions Comments, Pingbacks Thumbnails Attachments Custom fields (meta) What can you leverage? Templating URL Rewriting WP_Query Capabilities Admin UI, meta boxes Feeds

17. Let’s put it together add_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 template query_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 taxonomies Post Tags Categories Link Categories Menus

24. They describe your content. The difference between tags and categories is hierarchy. Topics People Cities Cities Content: Travel blog Cuisine Content: Restaurants Songs Content: Concerts Actors, Directors, Producers Content: Movies

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

26. Specialties taxonomy register_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' ); 1 2 3 4

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' ); 2 3 4 5 6 7 8 9 10 11 12 13

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() . '); }'; } 1 2 3 4 5 6

37. Menus Screenshot 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' ) ); 1 2 3 4 5 6 7

39. Menus Screenshot of menus in Twenty Ten

40. Evolving Theme Development get_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 Multisite The WPMU fork was merged Massive merge sprint, followed by cleanup Terminology/concept nightmare TODO: Network admin UI improvements TODO: 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 Admin New MU screen

51. Other cool features Pick a username/password during install comment_form() and wp_login_form() Stronger authentication security by default Bulk update plugins and themes “Search Engines Blocked” Rewritten initialization code

52. Follow along #wordpress-dev on freenode.net http://wpdevel.wordpress.com http://core.trac.wordpress.org wp-svn– mailing list for commits wp-hackers – plugin and core developers wp-testers

53. What might be next Column sorting and a more AJAX feel More features for custom post types and custom taxonomies Support for custom comment types Better support for custom post statuses Media/upload overhaul Incremental admin, DRY, UX changes Incremental improvements to multisite Links as a post type Roles/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. QualysBlindElephant BlindElephantis a web application fingerprinter. Drupal, Joomla!, Liferay, Mediawiki, Moodle, MovableType, osCommerce, phpBB, phpMyAdmin, phpNuke, SPIP, WordPress

62. 96 percent JOOMLA 1.5.20 Versions < 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 6.19 Versions < 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 percent WORDPRESS 3.0.1 Versions < 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 75,000times QUALITY ASSURANCE

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