Word Press Plugin Development

1. WordPress Plugin Development Presented By Thirupathi.J

3. What is WordPress? WordPress is an open source blog publishing application powered by PHP and MySQL which can also be used for content management. It has many features including a workflow, a plugin architecture and a templating system.

4. How to install WordPress? Download the wordpress latest version from: http://wordpress.org/download/

5. What is a WordPress plugin? Little applications used to enhance functionality or add specific functions tailored to a site's specific needs.

6. Some plugins: Capitalize Titles of Pages and Posts WordPress Database Backup WordPress.com Stats Comment Hilite

7. What do you need to make a plugin? a problem to solve some PHP knowledge some spare time a test server with your test wordpress (XAMPP is good.) ‏

9. Plugin API - Enabled "hooks" - Extend functionality without editing the core code - Two categories: Actions and Filters

10. 2 Kinds of WordPress Hooks Actions = “Do Something” Filters = “Transform”

11. Actions Actions are the hooks that the WordPress core launches at specific points during execution, or when specific events occur. Your plugin can specify that one or more of its PHP functions are executed at these points, using the Action API. add_action( 'hook_name', 'your_function_name', [priority], [accepted_args] );

12. Filters Functions that modify text, lists and various types of information that are used and produced by WordPress. add_filter('hook_name', 'your_filter_function', [priority], [accepted_args]);

13. Writing Your First Plugin

17. File Structure

18. Plugin Headers http://codex.wordpress.org/Writing_a_Plugin#Standard_Plugin_Information

20. Hooks (Filters)

22. PHP Code

23. Plugin 1 Figure out what you want to do. I want to convert all instances of “WordPress” to “WORDPRESS”in a post's content.

24. the_content (filter) http://codex.wordpress.org/Plugin_API/Filter_Reference/the_content

25. add_filter http://codex.wordpress.org/Plugin_API/Filter_Reference/the_content

26. add_filter http://codex.wordpress.org/Plugin_API#Hook_to_WordPress ② ① Hook Name ② Callback ①

29. They do the same thing

31. Filters are Transformations filters have to return a transformation

34. Plugin 2 Figure out what you want to do. I want to BOLD all instances of “WORDPRESS” in a post's content.

35. Hook Priority http://codex.wordpress.org/Plugin_API#Hook_to_WordPress

36. Priority ② ② Callback ① ③ ② ② ③ Priority (optional) ① Hook Name http://codex.wordpress.org/Plugin_API#Hook_to_WordPress

37. Which one goes first? WordPress2WORDPRESS#the_content ABolderWordPress#the_content

38. Default Priority 10 smaller numbers = higher priority larger numbers = lower priority http://codex.wordpress.org/Plugin_API#Hook_to_WordPress

39. Therefore Order of execution: (10) WordPress2WORDPRESS#the_content (20) ABolderWordPress#the_content

40. THANK YOU