This document discusses WordPress hooks, actions, and filters. It explains that hooks allow plugins and themes to modify WordPress features without editing core files. Actions allow running code when certain events occur, while filters allow modifying data before or after interacting with the database. Examples are provided of using filters to change excerpt lengths and modify Gravity Forms and WooCommerce data. Resources for learning more about WordPress hooks, actions, and filters are listed at the end.

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
obm.io/php2015-hooks

3. Hooks: Places where you
can add your own code.
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
obm.io/php2015-hooks

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!
obm.io/php2015-hooks

5. Actions: Hooks that let
you do something when
something else happens
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
obm.io/php2015-hooks

6. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
obm.io/php2015-hooks

7. Filters: Hooks that let you
modify data before or
after interacting with the
WordPress database
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
obm.io/php2015-hooks

8. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
obm.io/php2015-hooks

9. do_action()
Setting up our own hooks!
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
obm.io/php2015-hooks

10. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
obm.io/php2015-hooks

11. A SAMPLE GENESIS LANDING PAGE
obm.io/php2015-hooks

12. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
EXAMPLE: CHANGING EXCERPT LENGTH WITH A FILTER
obm.io/php2015-hooks

13. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
EXAMPLE: GRAVITY FORMS FILTER
obm.io/php2015-hooks

14. HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
EXAMPLE: WOOCOMMERCE ACTION AND FILTER
obm.io/php2015-hooks

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/
▸ http://genesistutorials.com/visual-hook-guide/
HOOKS, ACTIONS, AND FILTERS OH MY! @DAVIDLAIETTA
obm.io/php2015-hooks

16. @davidlaietta
obm.io/php2015-hooks
QUESTIONS?