WP_Sitemaps

17#[AllowDynamicProperties]18class WP_Sitemaps {19	/**20	 * The main index of supported sitemaps.21	 *22	 * @since 5.5.023	 *24	 * @var WP_Sitemaps_Index25	 */26	public $index;27 28	/**29	 * The main registry of supported sitemaps.30	 *31	 * @since 5.5.032	 *33	 * @var WP_Sitemaps_Registry34	 */35	public $registry;36 37	/**38	 * An instance of the renderer class.39	 *40	 * @since 5.5.041	 *42	 * @var WP_Sitemaps_Renderer43	 */44	public $renderer;45 46	/**47	 * WP_Sitemaps constructor.48	 *49	 * @since 5.5.050	 */51	public function __construct() {52		$this->registry = new WP_Sitemaps_Registry();53		$this->renderer = new WP_Sitemaps_Renderer();54		$this->index    = new WP_Sitemaps_Index( $this->registry );55	}56 57	/**58	 * Initiates all sitemap functionality.59	 *60	 * If sitemaps are disabled, only the rewrite rules will be registered61	 * by this method, in order to properly send 404s.62	 *63	 * @since 5.5.064	 */65	public function init() {66		// These will all fire on the init hook.67		$this->register_rewrites();68 69		add_action( 'template_redirect', array( $this, 'render_sitemaps' ) );70 71		if ( ! $this->sitemaps_enabled() ) {72			return;73		}74 75		$this->register_sitemaps();76 77		// Add additional action callbacks.78		add_filter( 'robots_txt', array( $this, 'add_robots' ), 0, 2 );79	}80 81	/**82	 * Determines whether sitemaps are enabled or not.83	 *84	 * @since 5.5.085	 *86	 * @return bool Whether sitemaps are enabled.87	 */88	public function sitemaps_enabled() {89		$is_enabled = (bool) get_option( 'blog_public' );90 91		/**92		 * Filters whether XML Sitemaps are enabled or not.93		 *94		 * When XML Sitemaps are disabled via this filter, rewrite rules are still95		 * in place to ensure a 404 is returned.96		 *