WordPress Hooks

create_category is an action that is fired when a new category is created by wp_insert_category(). The ID of the category is passed. The add_category hook does the exact same thing.

Context:

File: wp-admin/admin-db.php
	wp_cache_delete($cat_ID, 'category');

	if ($update) {
		do_action('edit_category', $cat_ID);
	} else {
		wp_cache_delete('all_category_ids', 'category');
		do_action('create_category', $cat_ID);
		do_action('add_category', $cat_ID);
	}

	return $cat_ID;

This hook is an action which means that it primarily acts as an event trigger, instead of a content filter. This is a semantic difference, but it will help you to remember what this hook does if you use it like this: add_action('create_category', 'your_function');

This hook was introduced in WordPress 2.0, and will not work in earlier versions.

This hook is filed under Action, Categories, WordPress 2.0 Only.