The document discusses WordPress plugins and the plugin architecture introduced in WordPress 1.2. It explains that plugins can modify WordPress through filters, which modify text, and actions, which execute code triggered by events. Filters and actions allow plugins to inject code at specific points via hooks. Examples of filters include the_content and wp_list_pages. Examples of actions include admin_head and save_post. The document provides code samples of plugins using filters and actions.

2. About Me Web Developer – imaginuity.com Links Personal Contact – Presentation – http://randyhoyt.com @randyhoyt http://r2h.me/plugins

3. WordPress 1.2 http://wordpress.org/news/2004/05/heres-the-beef/

4. WordPress 1.2 – New Plugin Architecture http://wordpress.org/news/2004/05/heres-the-beef/

7. Functions:

8. add_filter( $tag, $new_function, $priority, $accepted_args);

9. Applies a function to a filter hook

10. http://codex.wordpress.org/Function_Reference/add_filter

11. remove_filter( $tag, $new_function, $priority, $accepted_args);

12. Removes a function from a filter hook to which it has been added

14. Screenshot TwentyTen 198 add_filter('the_content', array(&$this, 'tw_update')); 578 function tw_update($content) { 612 $button = $this->tw_generate_button(); 621 return $button . $content; 634 }

15. Hoyt Family Password-Protected Blog

16. Hoyt Family function RRH_rss_remove_excerpt( $output ) { return "Please log in to our family web site to view this update."; } add_filter('the_excerpt_rss', 'RRH_rss_remove_excerpt');

17. Remove Wordpressto WordPressfilter http://wordpress.org/extend/plugins/remove-wordpress-to-wordpress-filter/

18. remove_filter('the_content','capital_P_dangit',11); remove_filter('the_title','capital_P_dangit',11); remove_filter('comment_text','capital_P_dangit',11); Remove Wordpressto WordPressfilter http://wordpress.org/extend/plugins/remove-wordpress-to-wordpress-filter/

20. Functions:

21. add_action( $tag, $new_function, $priority, $accepted_args );

22. Applies a function to a filter hook

23. http://codex.wordpress.org/Function_Reference/add_action

24. remove_action( $tag, $new_function, $priority, $accepted_args );

25. Removes a function from a filter hook to which it has been added

27. function Adminfavicon() { $options = get_option('favi_insert_url'); echo '<link rel="shortcut icon"  href="' . $options[favi_url] . '" />'; } add_action('admin_head', 'Adminfavicon'); Admin Favicon http://wordpress.org/extend/plugins/admin-favicon/

28. Redirector Redirector http://wordpress.org/extend/plugins/redirector/

29. Redirector Redirector http://wordpress.org/extend/plugins/redirector/

30. function re_adminhead() { add_meta_box('redirect',  __('Redirect','redirector'),  're_metabox', 'page'); } add_action('admin_head', 're_adminhead'); add_action('save_post', 're_meta_save'); function re_meta_save() { $redirect_to = $_POST['redirector']; if ($redirect_to) update_post_meta($_POST['ID'], 'redirector', $redirect_to); else delete_post_meta($_POST['ID'], 'redirector'); } Redirector http://wordpress.org/extend/plugins/redirector/

31. WP Tutorial: Your First WP Plugin http://markjaquith.wordpress.com/2006/03/04/wp-tutorial-your-first-wp-plugin/

32. About Me Web Developer – imaginuity.com Plugins vs. functions.php

34. WP-PageNavi http://wordpress.org/extend/plugins/wp-pagenavi/

35. Maintenance Mode http://wordpress.org/extend/plugins/maintenance-mode/

36. Theme My Login & Theme My Profile http://profiles.wordpress.org/users/jfarthing84/

37. KB Advanced RSS Widget http://wordpress.org/extend/plugins/kb-advanced-rss-widget/

38. KB Advanced RSS Widget http://wordpress.org/extend/plugins/kb-advanced-rss-widget/

39. Analytics360° http://wordpress.org/extend/plugins/analytics360/

40. Query Posts http://wordpress.org/extend/plugins/query-posts/

41. Query Posts http://wordpress.org/extend/plugins/query-posts/

42. TweetOnPost http://wordpress.org/extend/plugins/tweetonpost/

43. Wordbooker http://wordpress.org/extend/plugins/wordbooker/ WordBooker Twitter on Post Contact Form 7 / Gravity Forms

44. Gravity Forms http://www.gravityforms.com/