Learn how to approach WordPress Actions And Filters Explained with maintainable, native WordPress practices.
A well-built house has sockets in the walls so you never need to cut into the wiring. Hooks are those sockets for WordPress.
Plug In, Do Not Cut Open
Editing core or a third-party plugin works until the next update erases it. WordPress hooks give you a supported place to change behaviour: actions run code at a moment, filters modify a value on its way through.
Every customisation written as a hook survives updates, can be switched off in one line and is easy to read later.
Choose the Right Moment
Pick the earliest hook that has the data you need and the latest one that does not break other code. Use priorities sparingly and document why a number is not the default.
Remove hooks with the same priority and callback they were added with, otherwise nothing happens and nobody knows why.
Hook Hygiene
Keep your hooks tidy with this short list.
- Prefix every function and handle to avoid collisions.
- Validate inputs and escape outputs inside each callback.
- Load callbacks only where they are needed.
- Document what each hook changes and why.
Extensible by Design
When you build your own plugins, expose a few filters at the right places. Others, including future you, can then adapt behaviour without forking.
Quick Answers
What is the difference between an action and a filter?
An action runs code at a specific point; a filter receives a value, changes it and must return it.
Why use hooks instead of editing core?
Core edits are overwritten on update. Hooks live in your plugin, survive updates and can be removed cleanly.
Notes like this one come from real projects at StudioDDC, the studio where Didac Soria designs and builds custom WordPress plugins around real workflows.
Document a Plugin So Future You Understands It
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