WordPress Action Hooks

When to use

• The user wants to fire a custom extension point with do_action, or remove an action another plugin or the theme registered.
• The user needs to enqueue CSS or JS by hooking wp_enqueue_scripts or admin_enqueue_scripts.
• The user wants to run code when WordPress reaches a point such as init, wp_enqueue_scripts, or admin_menu.

When NOT to use

• Do not use plain action hooks to run something on a schedule; use WP-Cron (wp_schedule_event) which then fires its own action.
• Do not use an action when you must transform and return a value; use a filter (apply_filters/add_filter) instead.

Core guidance