Writing extensible plugins
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This document discusses writing extensible plugins in WordPress. It begins by introducing the speaker and their experience developing news websites using WordPress VIP. It then distinguishes between usability and extensibility, noting that extensibility allows plugins to be modified and extended by other plugins and themes. The document outlines reasons for writing extensible plugins like saving time and increasing code portability. It covers concepts like hooks, actions, filters and provides examples of how they can be used. It concludes with tips for writing extensible code like prefixing hook names and validating return values.
Writing extensible plugins
- 2. Imran Nathani What I do?: Team lead at Shaw Media for GlobalNews.ca About Me Past Experience: For 6 yrs I have been developing print and broadcast news websites. Of which 4 years, I have spent exclusively developing on WordPress VIP.
- 3. Usability Extensibility is not Usability Extensibility Target audience : All WordPress users Target audience: Developers Expectations: Options Page, Shortcodes, Widgets etc. Expectations: ?????
- 4. What is an extensible plugin? A plugin that can be modified and extended beyond its original purpose by another plugin or theme without modifying original plugin.
- 5. Why write an extensible plugin? Saves time Increases code portability Makes extra money $-) Reduces documentation
- 6. Helper functions “Helps” re-use code “Helps” make code easier to read
- 7. Hooks
- 8. Traditional function call What are hooks ?
- 9. Wordpress Hook call What are hooks ?
- 10. Wordpress hook call ( Multiple ) What are hooks ?
- 11. What are hooks ? Hooks are placeholders for code.
- 12. Action hook Filter hook Extending methods Extend values Returns nothing Returns a value do_action( … ) apply_filters( … ) Types of hooks
- 13. Action hook Wherever an action hook is placed, it will execute any code that has been “hooked” to it.
- 14. Usage A : do_action( ‘hook-name’ ); Action hook usage Usage B: do_action( ‘hook-name’ , $arg1, $arg2, … ); Usage C: do_action_ref_array( ‘hook-name’ , $array );
- 15. Utility functions add_action(..) Actions remove_action(..) remove_all_actions(..) has_action(..) did_action(..)
- 16. Action placements Actions Before a task After a task Append mark up
- 17. Core actions publish_post Actions save_post wp_head wp_foot
- 18. Actions DEMO
- 19. Filter hooks Wherever a filter hook is placed, it will manipulate any value that has been passed into with the function “hooked” to it
- 20. Usage A : Filter hook usage $value = apply_filters( ‘hook-name’ , $value ) Usage B : $value = apply_filters( ‘hook-name’ , $value, $args, .. )
- 21. Utility functions add_filter(…) Filters remove_filter(…) remove_all_filters(...) has_filter(…) current_filter( … )
- 22. Filter placements Filters Before using values Before value set up Before returning values
- 23. Core filters Filters the_title the_excerpt post_link the_date
- 24. Filters DEMO
- 28. Do not over extend! Tips & Tricks
- 32. Localize scripts with Filters Tips & Tricks
- 33. Localize scripts with Filters Tips & Tricks
- 34. Good reads Wordpress Codex ( How to? ) Wordpress Core ( Why to? )
- 35. Questions?