CSI: WordPress -- Getting Into the Guts
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The document is a presentation outline from WordCamp Birmingham discussing WordPress's extensibility and its developer APIs, which include themes, plugins, and various functionalities such as actions, filters, and metadata. The presenter, Dougal Campbell, acknowledges that the slide deck is incomplete but plans to provide a more thorough version at WordCamp Atlanta. Key features of WordPress highlighted include the ability for plugins to modify content, integrate third-party data, and manage user roles and access.
CSI: WordPress -- Getting Into the Guts
- 1. CSI: Getting Into the Guts WordCamp Birmingham, January 14, 2012
- 2. CSI: Getting Into the Guts WordCamp Birmingham, January 14, 2012
- 3. Version 0.5 Please note that due to unforeseen events, I did not complete this slide deck to my satisfaction before presenting it at WordCamp Birmingham. I will be doing this presentation again at WordCamp Atlanta, with an improved version of these slides. At that time, I will replace this presentation with the new, improved version which will contain more concrete developer information, code samples, and more comprehensive pointers to resources. Thank you for your understanding. -- Dougal
- 6. Extensibility WordPress can do just about any freaking thing you can think of
- 8. Extensibility ✤ Rich developer APIs
- 9. Extensibility ✤ Rich developer APIs ✤ Themes
- 10. Extensibility ✤ Rich developer APIs ✤ Themes ✤ Plugins
- 11. API
- 12. API ✤ Application Programming Interface
- 13. API ✤ Application Programming Interface ✤ “...a source code based specification intended to be used as an interface by software components to communicate with each other.” – Wikipedia
- 14. What kind of APIs? ✤ Pluggable functions ✤ Hooks ✤ Actions and Filters ✤ Metadata ✤ Post meta, User meta, Comment meta, Site Options ✤ Custom Javascript and CSS
- 15. Pluggable Functions Login/Cookie/User info Email notifications, wp_mail() Security: nonces, password salts & hashes Avatars Display of revision diffs
- 16. Themes ✤ Sidebars and Widgets ✤ Custom Headers and Backgrounds ✤ Custom Post Types and Taxonomies
- 17. Plugins
- 18. Plugins ✤ Plugins can do... practically anything:
- 19. Plugins ✤ Plugins can do... practically anything: ✤ Modify posts/pages
- 20. Plugins ✤ Plugins can do... practically anything: ✤ Modify posts/pages ✤ Integrate 3rd party data (Twitter, Facebook, etc.)
- 21. Plugins ✤ Plugins can do... practically anything: ✤ Modify posts/pages ✤ Integrate 3rd party data (Twitter, Facebook, etc.) ✤ Extend user info
- 22. Plugins ✤ Plugins can do... practically anything: ✤ Modify posts/pages ✤ Integrate 3rd party data (Twitter, Facebook, etc.) ✤ Extend user info ✤ Use Roles & Capabilities to control access to features
- 23. Plugins ✤ Plugins can do... practically anything: ✤ Modify posts/pages ✤ Integrate 3rd party data (Twitter, Facebook, etc.) ✤ Extend user info ✤ Use Roles & Capabilities to control access to features ✤ Create workflows (e.g., EditFlow plugin)
- 24. Plugins ✤ Plugins can do... practically anything: ✤ Modify posts/pages ✤ Integrate 3rd party data (Twitter, Facebook, etc.) ✤ Extend user info ✤ Use Roles & Capabilities to control access to features ✤ Create workflows (e.g., EditFlow plugin) ✤ Alternative login systems (LDAP, SSO)
- 25. Plugins ✤ Plugins can do... practically anything: ✤ Modify posts/pages ✤ Integrate 3rd party data (Twitter, Facebook, etc.) ✤ Extend user info ✤ Use Roles & Capabilities to control access to features ✤ Create workflows (e.g., EditFlow plugin) ✤ Alternative login systems (LDAP, SSO) ✤ The sky’s the limit!
- 26. Actions Actions are events Use them to DO something, rather than to CHANGE something
- 27. Actions plugins_loaded() setup_theme() wp_init() template_redirect() wp_head() wp_footer() http://andy.wordpress.com/2008/10/30/wordpress-include-stack/
- 28. Filters Modify existing content <?php add_filter( ‘the_content’, ‘lolify’ ); function lolify( $text_in ) { $text out = do_cool_stuff( $text_in ); return $text_out; } ?>
- 29. Metadata Lets you add additional details beyond what WordPress provides out-of-the- box.
- 30. Metadata ✤ “Data about Data” Lets you provide additional details that may or may not be visible on the site.
- 31. Putting it together ✤ codex.wordpress.org ✤ make.wordpress.org ✤ wpdevel.wordpress.com
- 32. Who are you? Dougal Campbell @dougal dougal.us / dougal.gunters.org [email protected]