register_taxonomy() WP 1.0

Creates or modifies a taxonomy object.

Note: Do not use before the 'init' hook.

A simple function for creating or modifying a taxonomy object based on the parameters given. If modifying an existing taxonomy object, note that the $object_type value from the original registration will be overwritten.

Hooks from function:

Return

WP_Error/null. WP_Error, if errors.

Usage

register_taxonomy( $taxonomy, $object_type, $args );

$taxonomy(string) (required)

Taxonomy key, must not exceed 32 characters.

$object_type(array/string) (required)

Object type or array of object types with which the taxonomy should be associated.

$args(array/string)

Array or query string of arguments for registering a taxonomy.

• $labels (array)
  An array of labels for this taxonomy. By default, Tag labels are used for non-hierarchical taxonomies, and Category labels are used for hierarchical taxonomies. See accepted values in get_taxonomy_labels().
  Default: empty array

• $description (string)
  A short descriptive summary of what the taxonomy is for.
  Default: ''

• $public (true/false)
  Whether a taxonomy is intended for use publicly either via the admin interface or by front-end users. The default settings of $publicly_queryable, $show_ui, and $show_in_nav_menus are inherited from $public.
  Default:

• $publicly_queryable (true/false)
  Whether the taxonomy is publicly queryable. If not set, the default is inherited from $public
  Default:

• $hierarchical (true/false)
  Whether the taxonomy is hierarchical.
  Default: false

• $show_ui (true/false)
  Whether to generate and allow a UI for managing terms in this taxonomy in the admin. If not set, the default is inherited from $public (default true).
  Default:

• $show_in_menu (true/false)
  Whether to show the taxonomy in the admin menu. If true, the taxonomy is shown as a submenu of the object type menu. If false, no menu is shown. $show_ui must be true. If not set.
  Default: inherited from $show_ui (default true)

• $show_in_nav_menus (true/false)
  Makes this taxonomy available for selection in navigation menus. If not set, the default is inherited from $public (default true).
  Default:

• $show_in_rest (true/false)
  Whether to include the taxonomy in the REST API.
  Default:

• $rest_base (string)
  To change the base url of REST API route.
  Default: $taxonomy

• $rest_controller_class (string)
  REST API Controller class name.
  Default: 'WP_REST_Terms_Controller'

• $show_tagcloud (true/false)
  Whether to list the taxonomy in the Tag Cloud Widget controls. If not set, the default is inherited from $show_ui (default true).
  Default:

• $show_in_quick_edit (true/false)
  Whether to show the taxonomy in the quick/bulk edit panel. It not set, the default is inherited from $show_ui (default true).
  Default:

• $show_admin_column (true/false)
  Whether to display a column for the taxonomy on its post type listing screens.
  Default: false

• $meta_box_cb (true/false/callable)
  Provide a callback function for the meta box display. If not set, post_categories_meta_box() is used for hierarchical taxonomies, and post_tags_meta_box() is used for non-hierarchical. If false, no meta box is shown.
  Default:

• $capabilities (array)
  { Array of capabilities for this taxonomy.
  Default:

• $manage_terms (string)
  Default 'manage_categories'.
  Default:

• $edit_terms (string)
  Default 'manage_categories'.
  Default:

• $delete_terms (string)
  Default 'manage_categories'.
  Default:

• $assign_terms (string)
  Default 'edit_posts'. }
  Default:

• $rewrite (true/false/array)
  { Triggers the handling of rewrites for this taxonomy. To prevent rewrite, set to false. To specify rewrite rules, an array can be passed with any of these keys:
  Default: true, using $taxonomy as slug

• $slug (string)
  Customize the permastruct slug.
  Default: $taxonomy key

• $with_front (true/false)
  Should the permastruct be prepended with WP_Rewrite::$front.
  Default: true

• $hierarchical (true/false)
  Either hierarchical rewrite tag or not.
  Default: false

• $ep_mask (int)
  Assign an endpoint mask. }
  Default: EP_NONE

• $query_var (string)
  Sets the query var key for this taxonomy. If false, a taxonomy cannot be loaded at ?{query_var}={term_slug}. If a string, the query ?{query_var}={term_slug} will be valid.
  Default: $taxonomy key

• $update_count_callback (callable)
  Works much like a hook, in that it will be called when the count is updated. Default _update_generic_term_count() for taxonomies attached to other object types, such as users.
  Default: _update_post_term_count() for taxonomies attached to post types, which confirms that the objects are published before counting them

• $_builtin (true/false)
  This taxonomy is a "built-in" taxonomy. INTERNAL USE ONLY! Default false.
  Default:

Default: array()

Code of register_taxonomy: wp-includes/taxonomy.php ^{VER 4.9.8}

<?php
function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
	global $wp_taxonomies;

	if ( ! is_array( $wp_taxonomies ) )
		$wp_taxonomies = array();

	$args = wp_parse_args( $args );

	if ( empty( $taxonomy ) || strlen( $taxonomy ) > 32 ) {
		_doing_it_wrong( __FUNCTION__, __( 'Taxonomy names must be between 1 and 32 characters in length.' ), '4.2.0' );
		return new WP_Error( 'taxonomy_length_invalid', __( 'Taxonomy names must be between 1 and 32 characters in length.' ) );
	}

	$taxonomy_object = new WP_Taxonomy( $taxonomy, $object_type, $args );
	$taxonomy_object->add_rewrite_rules();

	$wp_taxonomies[ $taxonomy ] = $taxonomy_object;

	$taxonomy_object->add_hooks();


	/**
	 * Fires after a taxonomy is registered.
	 *
	 * @since 3.3.0
	 *
	 * @param string       $taxonomy    Taxonomy slug.
	 * @param array|string $object_type Object type or array of object types.
	 * @param array        $args        Array of taxonomy registration arguments.
	 */
	do_action( 'registered_taxonomy', $taxonomy, $object_type, (array) $taxonomy_object );
}

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