Write Your First WordPress Plugin

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A session by Eng.Ibrahim Abdel Fattah Mohamed in WordCamp Egypt 2009, discussing how you can start with coding your own WordPress Plugins.

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Write Your First WordPress Plugin

  1. 1. Write your first WordPress Plugin Ibrahim Abdel Fattah Mohamed, aka bingorabbit www.bingorabbit.com Twitter: @bingorabbit .. and I HEART WordPress
  2. 2. Agenda ● What is a WordPress Plugin? ● Why do I need to write a WordPress Plugin? ● Plugin files structure and headers. ● How to add my plugin to my WordPress Blog. ● How to contribute to WordPress Development? ● Questions..
  3. 3. What is a WordPress Plugin? A piece of code, written to solve a problem or to add a specific functionality that is not there.
  4. 4. Why do I need to write a WordPress Plugin? ● Solving a problem. ● Add new functionality ● You love it, but have a better implementation? ● Modify it, extend it ● Want to make money?
  5. 5. How can I write a plugin? ● Find a problem you need to solve, or something new to add. ● Warm your hands. ● Choose a descriptive name. ● Document every little thing. ● Think about the license. ● Then start coding it..
  6. 6. Structure Wordpress/ |- wp-content/ |- plugins/ |- YourPlugin/ |- mainfile.php |- js/ |- css/ |- php/
  7. 7. Headers <?php /* Plugin Name: Your desired name Plugin URI: http://path.to/plugin/ Description: What does it actually do? Version: x.Y Author: This should be you Author URI: http://path.to/you/ */ ?>
  8. 8. Hooks ● Hooks are just..hooks.. ● Used to attach your plugin to a working system. ● Two types of Hook; Actions and Filters
  9. 9. Actions ● Actions, are just actions.. ● Actions triggers an event or a function. ● When a post is published (action), send an email to the administrator (function, event or reaction). add_action('hook_name', 'your_function_name', [priority], [accepted_args]);
  10. 10. Filters Database/User <----> Filters <----> Data ● Filters are also just..Filters.. ● Example, add some text just after every post. add_filter('hook_name', 'your_function_name', [priority], [accepted_args]);
  11. 11. Sample Plugin: Email Friends on New Post
  12. 12. Important Links ● Writing a Plugin ( http://codex.wordpress.org/Writing_a_Plugin) ● Plugin API (http://codex.wordpress.org/Plugin_API) ● Actions Reference ( http://codex.wordpress.org/Plugin_API/Action_Reference) ● Filters Reference ( http://codex.wordpress.org/Plugin_API/Filter_Reference) ● WordPress Coding Standards ( http://codex.wordpress.org/WordPress_Coding_Standards)
  13. 13. Contributing to WordPress..
  14. 14. Why? ● Improve the software you use.. ● Being a part of the community, learning and experience.
  15. 15. Where? ● Documentation, aka Codex ( http://codex.wordpress.org/Codex:Contributing) ● Translation ( http://codex.wordpress.org/Translating_WordPress) ● Support Forum (http://www.wordpress.org/support) ● IRC Channel (#WordPress-dev on Freenode) ● Development (Next Slide?)
  16. 16. How? ● Trac (http://trac.wordpress.org/) ● Code it, refine it, or just test it.. ● Got a bug? Go and report it.. http://wordpress.org/development/2009/03/contributing-to-wordpress-part-i-development/
  17. 17. Any Questions?..
  18. 18. Thanks!.. Ibrahim Abdel Fattah Mohamed www.bingorabbit.com www.catreloaded.net

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