In WordPress development, a hook is a way to insert custom code into WordPress at specific points without editing core files. Hooks are what make WordPress so extensible. They let themes and plugins modify behavior cleanly and safely.
Two Types of Hooks
- Action hooks: Let you add code that runs at a specific moment. For example, wp_footer fires just before the closing body tag. You can hook in to add custom scripts there.
- Filter hooks: Let you modify data before it’s used or displayed. For example, the_content lets you change what a post’s content looks like before it appears on screen.
How to Use a Hook
You use add_action() to hook into action hooks and add_filter() for filter hooks. This tells WordPress to run your function whenever a specific event occurs.
Why Hooks Matter
Hooks let you customize WordPress behavior without touching core files. If you edit core files directly, your changes disappear every time WordPress updates. Hooks keep your customizations safe and upgrade-proof.
Where to Add Hook Code
Add hook code in your theme’s functions.php file or, better yet, in a custom plugin. This keeps your logic separate from your design.
Related: WordPress Plugin
