Beginning WordPress Plugin Development
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Presented at WordCamp Malaysia 2010. Slideshare also does not resize my cropped images properly, thus resulting in squished images. This is noticeable on my squished code.
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Beginning WordPress Plugin Development
- 1. Beginning WordPress Plugin Development Aizat Faiz aizat.faiz@gmail.com
- 2. Download and view at http://blog.aizatto.com/?p=3729
- 5. Aizat Faiz http://www.flickr.com/photos/byte/3397174843/ [email_address]
- 6. Your Friends / Resources http://www.flickr.com/photos/balakov/4571468943/
- 10. What is a Hook? http://www.flickr.com/photos/kwl/4247555680/
- 11. WordPress is the Base http://www.flickr.com/photos/kwl/4247555680/
- 12. Plugins are the Blocks http://www.flickr.com/photos/sixteen-miles/3757674953/
- 13. Hooks are the Pegs http://www.flickr.com/photos/linuxmatt/92802487/
- 14. Actions Filters 2 Kinds of WordPress Hooks
- 15. Actions
- 17. Actions Actions = “Do Something”
- 18. Filters
- 19. Filters Filters are functions that WordPress passes data through, at certain points in execution, just before taking some action with the data (such as adding it to the database or sending it to the browser screen). Filters sit between the database and the browser (when WordPress is generating pages), and between the browser and the database (when WordPress is adding new posts and comments to the database); most input and output in WordPress passes through at least one filter. WordPress does some filtering by default, and your plugin can add its own filtering http://codex.wordpress.org/Plugin_API#Filters http://codex.wordpress.org/Plugin_API/Filter_Reference
- 20. Filters Filters = Transform
- 21. Actions and Filters Actions = “Do Something” Filters = Transform
- 23. 1133
- 25. Problem: Finding the Right Hook for the Right Job
- 31. Writing Your First Plugin
- 32. WordPress Directory Structure All Plugins are stored in: /wp-content/plugins/
- 34. screenshot-1.png
- 36. Uses 'dashes' and not 'underscores' http://codex.wordpress.org/Writing_a_Plugin#Names.2C_Files.2C_and_Locations
- 37. readme.txt http://codex.wordpress.org/Writing_a_Plugin#Readme_File http://wordpress.org/extend/plugins/about/readme.txt Useful only for publishing to WordPress Plugin Directory Information about your plugin: Description, Installation, Changelog, Donation Links, Tags, etc...
- 38. screenshot-1.png Useful only for publishing to WordPress Plugin Directory
- 40. Hooks
- 41. PHP Code
- 42. Template Code
- 43. File Structure
- 46. Fill in with your own details
- 47. Hooks (Filters)
- 49. Makes it easier to find
- 50. PHP Code
- 52. Plugin 1 Figure out what you want to do. I want to convert all instances of “WordPress” to “WORDPRESS” in a post's content.
- 53. the_content (filter) http://codex.wordpress.org/Plugin_API/Filter_Reference/the_content
- 55. add_filter http://codex.wordpress.org/Plugin_API#Hook_to_WordPress ② ① Hook Name ② Callback ①
- 58. Array of 2 strings (my preference)
- 60. They do the same thing
- 62. Lower chances of name conflicts
- 63. Easily tell which function belongs to which hook
- 64. Filters are Transformations filters have to return a transformation
- 67. Plugin 2 Figure out what you want to do. I want to BOLD all instances of “WORDPRESS” in a post's content.
- 69. Priority ② ② Callback ① ③ ② ② ③ Priority (optional) ① Hook Name http://codex.wordpress.org/Plugin_API#Hook_to_WordPress
- 70. Which one goes first? WordPress2WORDPRESS#the_content ABolderWordPress#the_content
- 71. Default Priority 10 smaller numbers = higher priority larger numbers = lower priority http://codex.wordpress.org/Plugin_API#Hook_to_WordPress
- 72. Therefore Order of execution: (10) WordPress2WORDPRESS#the_content (20) ABolderWordPress#the_content
- 74. Plugin 3 Figure out what you want to do. I want to add a class, to represent a post that has more than 10 comments
- 76. accepted_args http://codex.wordpress.org/Plugin_API#Hook_to_WordPress ① ③ ② ④ accepted args (optional) ① Hook Name ② Callback ④ ③ Priority
- 77. accepted_args Number of arguments for the filter
- 79. Plugin 4 Figure out what you want to do. I want to add a custom stylesheet
- 81. wp_enqueue_style ① ③ ② ① WordPress function ② Style ID ③ Style URL http://codex.wordpress.org/Function_Reference/wp_enqueue_style
- 82. Actions “Do Something” Actions do not need to return anything
- 84. Actions Filters 2 Kinds of WordPress Hooks
- 85. Actions Actions = “Do Something”
- 86. Filters Filters = Transform
- 87. Actions and Filters Actions = “Do Something” Filters = Transform
- 89. MOAR KITTEHS
- 90. Beginning WordPress Plugin Development Aizat Faiz [email_address] http://blog.aizatto.com/?p=3729 kthxbai
Editor's Notes
- The reason we all use WordPress, is because its free.
- My slides are also free. Free to use. Free to modify. Free to redistribute.
- Head developer at UrekaLabs Create Web applications on Ruby on Rails and PHP Used to do swing dancing, but stopped a year ago, and have massively gained weight
- When developing WordPress plugins, there are several friends you need to know
- Dirth of information available here Lots of information about everything
- Sometimes its not enough The WordPress Codex may not be enough
- You are not going to need to know all You are probably only going to use one or two of them
- You are not going to need to know all You are probably only going to use one or two of them
- There are so many hooks, which one do we need to use? Figure out what you want to do Go through the plugin Action and Filter Reference