: str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in
* REST API: WP_REST_Taxonomies_Controller class
* Core class used to manage taxonomies via the REST API.
* @see WP_REST_Controller
class WP_REST_Taxonomies_Controller extends WP_REST_Controller {
public function __construct() {
$this->namespace = 'wp/v2';
$this->rest_base = 'taxonomies';
* Registers the routes for taxonomies.
* @see register_rest_route()
public function register_routes() {
'methods' => WP_REST_Server::READABLE,
'callback' => array( $this, 'get_items' ),
'permission_callback' => array( $this, 'get_items_permissions_check' ),
'args' => $this->get_collection_params(),
'schema' => array( $this, 'get_public_item_schema' ),
'/' . $this->rest_base . '/(?P<taxonomy>[\w-]+)',
'description' => __( 'An alphanumeric identifier for the taxonomy.' ),
'methods' => WP_REST_Server::READABLE,
'callback' => array( $this, 'get_item' ),
'permission_callback' => array( $this, 'get_item_permissions_check' ),
'context' => $this->get_context_param( array( 'default' => 'view' ) ),
'schema' => array( $this, 'get_public_item_schema' ),
* Checks whether a given request has permission to read taxonomies.
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True if the request has read access, WP_Error object otherwise.
public function get_items_permissions_check( $request ) {
if ( 'edit' === $request['context'] ) {
if ( ! empty( $request['type'] ) ) {
$taxonomies = get_object_taxonomies( $request['type'], 'objects' );
$taxonomies = get_taxonomies( '', 'objects' );
foreach ( $taxonomies as $taxonomy ) {
if ( ! empty( $taxonomy->show_in_rest ) && current_user_can( $taxonomy->cap->assign_terms ) ) {
__( 'Sorry, you are not allowed to manage terms in this taxonomy.' ),
array( 'status' => rest_authorization_required_code() )
* Retrieves all public taxonomies.
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response Response object on success, or WP_Error object on failure.
public function get_items( $request ) {
// Retrieve the list of registered collection query parameters.
$registered = $this->get_collection_params();
if ( isset( $registered['type'] ) && ! empty( $request['type'] ) ) {
$taxonomies = get_object_taxonomies( $request['type'], 'objects' );
$taxonomies = get_taxonomies( '', 'objects' );
foreach ( $taxonomies as $tax_type => $value ) {
if ( empty( $value->show_in_rest ) || ( 'edit' === $request['context'] && ! current_user_can( $value->cap->assign_terms ) ) ) {
$tax = $this->prepare_item_for_response( $value, $request );
$tax = $this->prepare_response_for_collection( $tax );
$data[ $tax_type ] = $tax;
// Response should still be returned as a JSON object when it is empty.
return rest_ensure_response( $data );
* Checks if a given request has access to a taxonomy.
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True if the request has read access for the item, otherwise false or WP_Error object.
public function get_item_permissions_check( $request ) {
$tax_obj = get_taxonomy( $request['taxonomy'] );
if ( empty( $tax_obj->show_in_rest ) ) {
if ( 'edit' === $request['context'] && ! current_user_can( $tax_obj->cap->assign_terms ) ) {
'rest_forbidden_context',
__( 'Sorry, you are not allowed to manage terms in this taxonomy.' ),
array( 'status' => rest_authorization_required_code() )
* Retrieves a specific taxonomy.
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
public function get_item( $request ) {
$tax_obj = get_taxonomy( $request['taxonomy'] );
if ( empty( $tax_obj ) ) {
__( 'Invalid taxonomy.' ),
$data = $this->prepare_item_for_response( $tax_obj, $request );
return rest_ensure_response( $data );
* Prepares a taxonomy object for serialization.
* @since 5.9.0 Renamed `$taxonomy` to `$item` to match parent class for PHP 8 named parameter support.
* @param WP_Taxonomy $item Taxonomy data.
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response Response object.
public function prepare_item_for_response( $item, $request ) {
// Restores the more descriptive, specific name for use within this method.
$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
$fields = $this->get_fields_for_response( $request );
if ( in_array( 'name', $fields, true ) ) {
$data['name'] = $taxonomy->label;
if ( in_array( 'slug', $fields, true ) ) {
$data['slug'] = $taxonomy->name;
if ( in_array( 'capabilities', $fields, true ) ) {
$data['capabilities'] = $taxonomy->cap;
if ( in_array( 'description', $fields, true ) ) {
$data['description'] = $taxonomy->description;
if ( in_array( 'labels', $fields, true ) ) {
$data['labels'] = $taxonomy->labels;
if ( in_array( 'types', $fields, true ) ) {
$data['types'] = array_values( $taxonomy->object_type );
if ( in_array( 'show_cloud', $fields, true ) ) {
$data['show_cloud'] = $taxonomy->show_tagcloud;
if ( in_array( 'hierarchical', $fields, true ) ) {
$data['hierarchical'] = $taxonomy->hierarchical;
if ( in_array( 'rest_base', $fields, true ) ) {
$data['rest_base'] = $base;
if ( in_array( 'rest_namespace', $fields, true ) ) {
$data['rest_namespace'] = $taxonomy->rest_namespace;
if ( in_array( 'visibility', $fields, true ) ) {
$data['visibility'] = array(
'public' => (bool) $taxonomy->public,
'publicly_queryable' => (bool) $taxonomy->publicly_queryable,
'show_admin_column' => (bool) $taxonomy->show_admin_column,
'show_in_nav_menus' => (bool) $taxonomy->show_in_nav_menus,
'show_in_quick_edit' => (bool) $taxonomy->show_in_quick_edit,
'show_ui' => (bool) $taxonomy->show_ui,
$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
$data = $this->add_additional_fields_to_object( $data, $request );
$data = $this->filter_response_by_context( $data, $context );
// Wrap the data in a response object.
$response = rest_ensure_response( $data );
if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
$response->add_links( $this->prepare_links( $taxonomy ) );
* Filters a taxonomy returned from the REST API.
* Allows modification of the taxonomy data right before it is returned.
* @param WP_REST_Response $response The response object.
* @param WP_Taxonomy $item The original taxonomy object.
* @param WP_REST_Request $request Request used to generate the response.
return apply_filters( 'rest_prepare_taxonomy', $response, $taxonomy, $request );
* Prepares links for the request.
* @param WP_Taxonomy $taxonomy The taxonomy.
* @return array Links for the given taxonomy.
protected function prepare_links( $taxonomy ) {
'href' => rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ),
'https://api.w.org/items' => array(
'href' => rest_url( rest_get_route_for_taxonomy_items( $taxonomy->name ) ),
* Retrieves the taxonomy's schema, conforming to JSON Schema.
* @since 5.0.0 The `visibility` property was added.
* @since 5.9.0 The `rest_namespace` property was added.
* @return array Item schema data.
public function get_item_schema() {
return $this->add_additional_fields_schema( $this->schema );
'$schema' => 'http://json-schema.org/draft-04/schema#',
'description' => __( 'All capabilities used by the taxonomy.' ),
'context' => array( 'edit' ),
'description' => __( 'A human-readable description of the taxonomy.' ),
'context' => array( 'view', 'edit' ),
'description' => __( 'Whether or not the taxonomy should have children.' ),
'context' => array( 'view', 'edit' ),
'description' => __( 'Human-readable labels for the taxonomy for various contexts.' ),
'context' => array( 'edit' ),
'description' => __( 'The title for the taxonomy.' ),
'context' => array( 'view', 'edit', 'embed' ),
'description' => __( 'An alphanumeric identifier for the taxonomy.' ),
'context' => array( 'view', 'edit', 'embed' ),
'description' => __( 'Whether or not the term cloud should be displayed.' ),
'context' => array( 'edit' ),
'description' => __( 'Types associated with the taxonomy.' ),
'context' => array( 'view', 'edit' ),
'description' => __( 'REST base route for the taxonomy.' ),
'context' => array( 'view', 'edit', 'embed' ),
'rest_namespace' => array(
'description' => __( 'REST namespace route for the taxonomy.' ),
'context' => array( 'view', 'edit', 'embed' ),
'description' => __( 'The visibility settings for the taxonomy.' ),
'context' => array( 'edit' ),
'description' => __( 'Whether a taxonomy is intended for use publicly either via the admin interface or by front-end users.' ),
'publicly_queryable' => array(
'description' => __( 'Whether the taxonomy is publicly queryable.' ),
'description' => __( 'Whether to generate a default UI for managing this taxonomy.' ),
'show_admin_column' => array(
'description' => __( 'Whether to allow automatic creation of taxonomy columns on associated post-types table.' ),
'show_in_nav_menus' => array(
'description' => __( 'Whether to make the taxonomy available for selection in navigation menus.' ),
'show_in_quick_edit' => array(
'description' => __( 'Whether to show the taxonomy in the quick/bulk edit panel.' ),
return $this->add_additional_fields_schema( $this->schema );
* Retrieves the query params for collections.
* @return array Collection parameters.
public function get_collection_params() {
$new_params['context'] = $this->get_context_param( array( 'default' => 'view' ) );
$new_params['type'] = array(
'description' => __( 'Limit results to taxonomies associated with a specific post type.' ),