// Taxonomy registration.
* Creates the initial taxonomies.
* This function fires twice: in wp-settings.php before plugins are loaded (for
* backward compatibility reasons), and again on the {@see 'init'} action. We must
* avoid registering rewrite rules before the {@see 'init'} action.
* @global WP_Rewrite $wp_rewrite WordPress rewrite component.
function create_initial_taxonomies() {
if ( ! did_action( 'init' ) ) {
* Filters the post formats rewrite base.
* @param string $context Context of the rewrite base. Default 'type'.
$post_format_base = apply_filters( 'post_format_rewrite_base', 'type' );
'slug' => get_option( 'category_base' ) ? get_option( 'category_base' ) : 'category',
'with_front' => ! get_option( 'category_base' ) || $wp_rewrite->using_index_permalinks(),
'ep_mask' => EP_CATEGORIES,
'slug' => get_option( 'tag_base' ) ? get_option( 'tag_base' ) : 'tag',
'with_front' => ! get_option( 'tag_base' ) || $wp_rewrite->using_index_permalinks(),
'post_format' => $post_format_base ? array( 'slug' => $post_format_base ) : false,
'query_var' => 'category_name',
'rewrite' => $rewrite['category'],
'show_admin_column' => true,
'manage_terms' => 'manage_categories',
'edit_terms' => 'edit_categories',
'delete_terms' => 'delete_categories',
'assign_terms' => 'assign_categories',
'rest_base' => 'categories',
'rest_controller_class' => 'WP_REST_Terms_Controller',
'rewrite' => $rewrite['post_tag'],
'show_admin_column' => true,
'manage_terms' => 'manage_post_tags',
'edit_terms' => 'edit_post_tags',
'delete_terms' => 'delete_post_tags',
'assign_terms' => 'assign_post_tags',
'rest_controller_class' => 'WP_REST_Terms_Controller',
'name' => __( 'Navigation Menus' ),
'singular_name' => __( 'Navigation Menu' ),
'show_in_nav_menus' => false,
'name' => __( 'Link Categories' ),
'singular_name' => __( 'Link Category' ),
'search_items' => __( 'Search Link Categories' ),
'all_items' => __( 'All Link Categories' ),
'edit_item' => __( 'Edit Link Category' ),
'update_item' => __( 'Update Link Category' ),
'add_new_item' => __( 'Add New Link Category' ),
'new_item_name' => __( 'New Link Category Name' ),
'separate_items_with_commas' => null,
'add_or_remove_items' => null,
'choose_from_most_used' => null,
'back_to_items' => __( '← Go to Link Categories' ),
'manage_terms' => 'manage_links',
'edit_terms' => 'manage_links',
'delete_terms' => 'manage_links',
'assign_terms' => 'manage_links',
'name' => _x( 'Formats', 'post format' ),
'singular_name' => _x( 'Format', 'post format' ),
'rewrite' => $rewrite['post_format'],
'show_in_nav_menus' => current_theme_supports( 'post-formats' ),
* Retrieves a list of registered taxonomy names or objects.
* @global array $wp_taxonomies The registered taxonomies.
* @param array $args Optional. An array of `key => value` arguments to match against the taxonomy objects.
* @param string $output Optional. The type of output to return in the array. Accepts either taxonomy 'names'
* or 'objects'. Default 'names'.
* @param string $operator Optional. The logical operation to perform. Accepts 'and' or 'or'. 'or' means only
* one element from the array needs to match; 'and' means all elements must match.
* @return string[]|WP_Taxonomy[] An array of taxonomy names or objects.
function get_taxonomies( $args = array(), $output = 'names', $operator = 'and' ) {
$field = ( 'names' === $output ) ? 'name' : false;
return wp_filter_object_list( $wp_taxonomies, $args, $operator, $field );
* Return the names or objects of the taxonomies which are registered for the requested object or object type, such as
* a post object or post type name.
* $taxonomies = get_object_taxonomies( 'post' );
* Array( 'category', 'post_tag' )
* @global array $wp_taxonomies The registered taxonomies.
* @param string|string[]|WP_Post $object Name of the type of taxonomy object, or an object (row from posts)
* @param string $output Optional. The type of output to return in the array. Accepts either
* 'names' or 'objects'. Default 'names'.
* @return string[]|WP_Taxonomy[] The names or objects of all taxonomies of `$object_type`.
function get_object_taxonomies( $object, $output = 'names' ) {
if ( is_object( $object ) ) {
if ( 'attachment' === $object->post_type ) {
return get_attachment_taxonomies( $object, $output );
$object = $object->post_type;
$object = (array) $object;
foreach ( (array) $wp_taxonomies as $tax_name => $tax_obj ) {
if ( array_intersect( $object, (array) $tax_obj->object_type ) ) {
if ( 'names' === $output ) {
$taxonomies[] = $tax_name;
$taxonomies[ $tax_name ] = $tax_obj;
* Retrieves the taxonomy object of $taxonomy.
* The get_taxonomy function will first check that the parameter string given
* is a taxonomy object and if it is, it will return it.
* @global array $wp_taxonomies The registered taxonomies.
* @param string $taxonomy Name of taxonomy object to return.
* @return WP_Taxonomy|false The Taxonomy Object or false if $taxonomy doesn't exist.
function get_taxonomy( $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
return $wp_taxonomies[ $taxonomy ];
* Determines whether the taxonomy name exists.
* Formerly is_taxonomy(), introduced in 2.3.0.
* For more information on this and similar theme functions, check out
* the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
* Conditional Tags} article in the Theme Developer Handbook.
* @global array $wp_taxonomies The registered taxonomies.
* @param string $taxonomy Name of taxonomy object.
* @return bool Whether the taxonomy exists.
function taxonomy_exists( $taxonomy ) {
return isset( $wp_taxonomies[ $taxonomy ] );
* Determines whether the taxonomy object is hierarchical.
* Checks to make sure that the taxonomy is an object first. Then Gets the
* object, and finally returns the hierarchical value in the object.
* A false return value might also mean that the taxonomy does not exist.
* For more information on this and similar theme functions, check out
* the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
* Conditional Tags} article in the Theme Developer Handbook.
* @param string $taxonomy Name of taxonomy object.
* @return bool Whether the taxonomy is hierarchical.
function is_taxonomy_hierarchical( $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
$taxonomy = get_taxonomy( $taxonomy );
return $taxonomy->hierarchical;
* Creates or modifies a taxonomy object.
* Note: Do not use before the {@see 'init'} hook.
* A simple function for creating or modifying a taxonomy object based on
* the parameters given. If modifying an existing taxonomy object, note
* that the `$object_type` value from the original registration will be
* @since 4.2.0 Introduced `show_in_quick_edit` argument.
* @since 4.4.0 The `show_ui` argument is now enforced on the term editing screen.
* @since 4.4.0 The `public` argument now controls whether the taxonomy can be queried on the front end.
* @since 4.5.0 Introduced `publicly_queryable` argument.
* @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
* arguments to register the Taxonomy in REST API.
* @since 5.1.0 Introduced `meta_box_sanitize_cb` argument.
* @since 5.4.0 Added the registered taxonomy object as a return value.
* @since 5.5.0 Introduced `default_term` argument.
* @global array $wp_taxonomies Registered taxonomies.
* @param string $taxonomy Taxonomy key, must not exceed 32 characters.
* @param array|string $object_type Object type or array of object types with which the taxonomy should be associated.
* @param array|string $args {
* Optional. Array or query string of arguments for registering a taxonomy.
* @type string[] $labels 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.
* @type string $description A short descriptive summary of what the taxonomy is for. Default empty.
* @type bool $public Whether a taxonomy is intended for use publicly either via
* the admin interface or by front-end users. The default settings
* of `$publicly_queryable`, `$show_ui`, and `$show_in_nav_menus`
* are inherited from `$public`.
* @type bool $publicly_queryable Whether the taxonomy is publicly queryable.
* If not set, the default is inherited from `$public`
* @type bool $hierarchical Whether the taxonomy is hierarchical. Default false.
* @type bool $show_ui Whether to generate and allow a UI for managing terms in this taxonomy in
* the admin. If not set, the default is inherited from `$public`
* @type bool $show_in_menu Whether to show the taxonomy in the admin menu. If true, the taxonomy is
* shown as a submenu of the object type menu. If false, no menu is shown.
* `$show_ui` must be true. If not set, default is inherited from `$show_ui`
* @type bool $show_in_nav_menus Makes this taxonomy available for selection in navigation menus. If not
* set, the default is inherited from `$public` (default true).
* @type bool $show_in_rest Whether to include the taxonomy in the REST API. Set this to true
* for the taxonomy to be available in the block editor.
* @type string $rest_base To change the base url of REST API route. Default is $taxonomy.
* @type string $rest_controller_class REST API Controller class name. Default is 'WP_REST_Terms_Controller'.
* @type bool $show_tagcloud Whether to list the taxonomy in the Tag Cloud Widget controls. If not set,
* the default is inherited from `$show_ui` (default true).
* @type bool $show_in_quick_edit Whether to show the taxonomy in the quick/bulk edit panel. It not set,
* the default is inherited from `$show_ui` (default true).
* @type bool $show_admin_column Whether to display a column for the taxonomy on its post type listing
* screens. Default false.
* @type bool|callable $meta_box_cb 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
* @type callable $meta_box_sanitize_cb Callback function for sanitizing taxonomy data saved from a meta
* box. If no callback is defined, an appropriate one is determined
* based on the value of `$meta_box_cb`.
* @type string[] $capabilities {
* Array of capabilities for this taxonomy.
* @type string $manage_terms Default 'manage_categories'.
* @type string $edit_terms Default 'manage_categories'.
* @type string $delete_terms Default 'manage_categories'.
* @type string $assign_terms Default 'edit_posts'.
* @type bool|array $rewrite {
* Triggers the handling of rewrites for this taxonomy. Default true, using $taxonomy as slug. To prevent
* rewrite, set to false. To specify rewrite rules, an array can be passed with any of these keys:
* @type string $slug Customize the permastruct slug. Default `$taxonomy` key.
* @type bool $with_front Should the permastruct be prepended with WP_Rewrite::$front. Default true.
* @type bool $hierarchical Either hierarchical rewrite tag or not. Default false.
* @type int $ep_mask Assign an endpoint mask. Default `EP_NONE`.
* @type string|bool $query_var Sets the query var key for this taxonomy. Default `$taxonomy` key. If
* false, a taxonomy cannot be loaded at `?{query_var}={term_slug}`. If a
* string, the query `?{query_var}={term_slug}` will be valid.
* @type callable $update_count_callback Works much like a hook, in that it will be called when the count is
* updated. Default _update_post_term_count() for taxonomies attached
* to post types, which confirms that the objects are published before
* counting them. Default _update_generic_term_count() for taxonomies
* attached to other object types, such as users.
* @type string|array $default_term {
* Default term to be used for the taxonomy.
* @type string $name Name of default term.
* @type string $slug Slug for default term. Default empty.
* @type string $description Description for default term. Default empty.
* @type bool $sort Whether terms in this taxonomy should be sorted in the order they are
* provided to `wp_set_object_terms()`. Default null which equates to false.
* @type array $args Array of arguments to automatically use inside `wp_get_object_terms()`
* @type bool $_builtin This taxonomy is a "built-in" taxonomy. INTERNAL USE ONLY!
* @return WP_Taxonomy|WP_Error The registered taxonomy object on success, WP_Error object on failure.
function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
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();
if ( ! empty( $taxonomy_object->default_term ) ) {
$term = term_exists( $taxonomy_object->default_term['name'], $taxonomy );
update_option( 'default_term_' . $taxonomy_object->name, $term['term_id'] );
$taxonomy_object->default_term['name'],
'slug' => sanitize_title( $taxonomy_object->default_term['slug'] ),
'description' => $taxonomy_object->default_term['description'],
// Update `term_id` in options.
if ( ! is_wp_error( $term ) ) {
update_option( 'default_term_' . $taxonomy_object->name, $term['term_id'] );
* Fires after a taxonomy is registered.
* @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 );
* Unregisters a taxonomy.
* Can not be used to unregister built-in taxonomies.
* @global WP $wp Current WordPress environment instance.
* @global array $wp_taxonomies List of taxonomies.
* @param string $taxonomy Taxonomy name.
* @return true|WP_Error True on success, WP_Error on failure or if the taxonomy doesn't exist.
function unregister_taxonomy( $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
