Hooks allow code to interact with and modify other code at certain points in the WordPress page lifecycle. There are two main types of hooks: actions, which execute code when events occur; and filters, which modify data before it is sent to the browser or database. Actions are used when you want something to happen, like sending an email when a post is published. Filters are used when you want to change something, like adding text to post titles. Hooks are constructed by specifying a tag name, callback function, priority, and arguments.

1. What the Hook
What YOU should know about
WordPress Actions & Filters
M u h a m m a d K a s h i f
m e @ K a s h i f . i o

2. Intro
Muhammad Kashif
F o u n d e r & C E O - M e s h P r o s
M a s t e r T r a i n e r - e R o z g a a r
O r g a n i z e r – W C L a h o r e 2 0 1 9

3. How do you make changes
Core/Themes/Plugins

4. What areHooks?

5. What areHooks?
Hooks are a way for one piece of
code to interact/modify another
piece of code.

6. What areHooks?
“Hooks enable us to literally hook into parts of
the WordPress page lifecycle to retrieve, insert,
or modify data, or they allow us to take certain
actions behind the scenes. ”
-TOM MCFARLIN @ TUTSPLUS

7. What areHooks?

8. Types
Actions
Filters

9. Actions
Functions that are executed when
something happens in WordPress.
For example:
• When a post is published
• Before the header is loaded
Declared with add_action

10. Actions
Functions that are executed when
something happens in WordPress.
You can attach custom code at theseevents:

11. Actions
Functions that are executed when
something happens in WordPress.
You can attach custom code at theseevents:
• When a post is published, send me anemail

12. Actions
Functions that are executed when
something happens in WordPress.
You can attach custom code at theseevents:
• When a post is published, send me anemail
• When the header is loaded, add some css

13. Functions that WordPress passes
data through before it is sent tothe
browser or database.
Filters

14. Functions that WordPress passes
data through before it is sent tothe
browser or database.
For example:
• When the post title isdisplayed
• When the author url isoutput
Declared with add_filter
Filters

15. Filters
Functions that WordPress passes
data through before it is sent tothe
browser or database.
You can attach custom code at theseevents:

16. Filters
Functions that WordPress passes
data through before it is sent tothe
browser or database.
You can attach custom code at theseevents:
• When the post title is displayed, add something

17. Which Hook should Iuse?
Actions FiltersOR

18. Which Hook should Iuse?
ORActions
Use an action when
you want something
to happen
Filters
Use a filter when you
want to change
something

19. Info about hooks
https://codex.wordpress.org/Plugin_API
Example Actions
wp_enqueue_scripts
create_category
publish_page
the_title
excerpt_more
the_content
Example Filters

20. How to construct a hook

21. How to construct a hook
tag - the name of the action to attach code to
your_function - the name of your custom function
$priority -the order that the functions are executed
$args - the number of arguments sent to your function

22. Breaking it down

23. Some Poetry

24. Nog vragen ?

25. me@kashif.io
Contacts
@imQashif