Understanding WordPress Hooks — a practical guide to WordPress hooks with clear examples you can reuse in real projects.
WordPress Plugin Development Series (11/95). Prefer one article? Read the complete WordPress plugin development tutorial.
Short description
Hooks are the core extension system. Priority controls order; accepted_args controls how many parameters your callback receives.
Hook basics
add_action('init', 'acme_boot', 10);
add_filter('the_title', 'acme_prefix_title', 10, 2);
function acme_prefix_title($title, $post_id) {
return '[ACME] ' . $title;
}