WP_REST_Taxonomies_Controller::get_items

	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' );
		} else {
			$taxonomies = get_taxonomies( '', 'objects' );
		}

		$data = array();

		foreach ( $taxonomies as $tax_type => $value ) {
			if ( empty( $value->show_in_rest ) || ( 'edit' === $request['context'] && ! current_user_can( $value->cap->assign_terms ) ) ) {
				continue;
			}

			$tax               = $this->prepare_item_for_response( $value, $request );
			$tax               = $this->prepare_response_for_collection( $tax );
			$data[ $tax_type ] = $tax;
		}

		if ( empty( $data ) ) {
			// Response should still be returned as a JSON object when it is empty.
			$data = (object) $data;
		}

		return rest_ensure_response( $data );
	}