A basic primer for WordPress Hooks, Actions, and Filters. If you are getting started with WordPress and have basic PHP knowledge, these examples are a quick demonstration of how to extend and expand upon WordPress for your sites and your clients.

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?