Writing Extensible Plugins in WordPress with Hooks and Filters

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Imran Nathani

Wordcamp Toronto 2013 #WCTO2013

Tecnología Empresariales

Writing Extensible
Plugins in
WordPress
#WCTO2013

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.

Usability

Extensibility
is not
Usability

Extensibility

 Target audience :
All WordPress users

 Target audience:
Developers

 Expectations:
Options Page,
Shortcodes,
Widgets etc.

 Expectations:

?????

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.

Why write
an
extensible
plugin?

 Saves time
 Increases code portability
 Makes extra money $-)

 Reduces documentation

Helper
functions

 “Helps” re-use code
 “Helps” make code easier to read

Traditional function call

What are
hooks ?

Wordpress hook call ( Multiple )

What are
hooks ?

What are
hooks ?

Hooks are placeholders
for code.

Action hook

Filter hook

 Extending methods

 Extend values

 Returns nothing

 Returns a value

do_action( … )

apply_filters( … )

Types of
hooks

Action
hook

Wherever an action hook
is placed, it will execute
any code that has been
“hooked” to it.

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 );

Utility functions
 add_action(..)

Actions

 remove_action(..)
 remove_all_actions(..)
 has_action(..)
 did_action(..)

Action placements
Actions

 Before a task
 After a task
 Append mark up

Core actions
 publish_post

Actions

 save_post

 wp_head
 wp_foot

Filter
hooks

Wherever a filter hook is
placed, it will manipulate
any value that has been
passed into with the
function “hooked” to it

Usage A :

Filter
hook
usage

$value = apply_filters( ‘hook-name’ , $value )
Usage B :

$value = apply_filters( ‘hook-name’ , $value, $args, .. )

Utility functions
 add_filter(…)

Filters

 remove_filter(…)
 remove_all_filters(...)
 has_filter(…)
 current_filter( … )

Filter placements
Filters

 Before using values
 Before value set up
 Before returning values

Core filters
Filters

 the_title
 the_excerpt

 post_link
 the_date

Localize scripts with Filters
Tips
&
Tricks

Good
reads

Wordpress Codex ( How to? )
Wordpress Core ( Why to? )

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Writing Extensible Plugins in WordPress with Hooks and Filters

1. Writing Extensible Plugins in WordPress #WCTO2013

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

25. Improve efficiency Tips & Tricks

26. Improve efficiency Tips & Tricks