The document explains the concepts of hooks, actions, and filters in WordPress, highlighting their importance in modifying WordPress functionality without altering core files or existing plugins. It describes how actions trigger additional functionality and how filters allow data modification around database interactions. Additionally, it provides resources for further learning on these topics.

1. @DAVIDLAIETTA
HOOKS, ACTIONS, AND FILTERS OH MY!

2. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
WHY USE HOOKS?
▸ Most WordPress features use actions and filters that you can
modify to change how WordPress fundamentally works
▸ You can make complex changes easily without editing core,
or existing plugins or themes that you’ve purchased
▸ Make changes at the source, instead of hacking away
▸ Upgrade without worry of losing your modifications
▸ Enable and disable your changes easily

3. Hooks: Places where you
can add your own code.
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA

4. Mr. WordPress
HOW A HOOK IS BORN
I’m going to do this thing.
Before you do your thing, I’ve got this other
thing that I want to do.
Mr. WordPress
Ms. Plugin
Ok, do your thing, then I’ll do my thing!

5. Actions: Hooks that let
you do something when
something else happens
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA

6. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA

7. Filters: Hooks that let you
modify data before or
after interacting with the
WordPress database
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA

8. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA

9. do_action()
Setting up our own hooks!
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA

10. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA

11. A SAMPLE GENESIS LANDING PAGE

12. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
EXAMPLE: CHANGING EXCERPT LENGTH WITH A FILTER

13. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
EXAMPLE: GRAVITY FORMS FILTER

14. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
EXAMPLE: WOOCOMMERCE ACTION AND FILTER

15. RESOURCES
▸ http://codex.wordpress.org/Plugin_API/Action_Reference
▸ http://codex.wordpress.org/Plugin_API/Filter_Reference
▸ http://blog.teamtreehouse.com/hooks-wordpress-actions-
filters-examples
▸ https://docs.woothemes.com/document/hooks/
▸ https://www.gravityhelp.com/documentation/category/
hooks/
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA

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QUESTIONS?