Codex

Plugin API/Hooks

This article on the Plugin Hooks available in Version 2.1 of WordPress has now been split into two sections:

To learn more about what Filter and Action Hooks are, see Plugin API. For information about hooks in previous versions of WordPress, see Plugin API/Hooks 2.0.x.

Notes

Terminology

In WordPress Codex and source code, the terms "actions/filters", "action/filter hooks", "hooks", "action/filter functions" and "hooked functions" are sometimes used ambiguously, see the Terminology Confusion note.