WP_Sitemaps_Posts

17class WP_Sitemaps_Posts extends WP_Sitemaps_Provider {18	/**19	 * WP_Sitemaps_Posts constructor.20	 *21	 * @since 5.5.022	 */23	public function __construct() {24		$this->name        = 'posts';25		$this->object_type = 'post';26	}27 28	/**29	 * Returns the public post types, which excludes nav_items and similar types.30	 * Attachments are also excluded. This includes custom post types with public = true.31	 *32	 * @since 5.5.033	 *34	 * @return WP_Post_Type[] Array of registered post type objects keyed by their name.35	 */36	public function get_object_subtypes() {37		$post_types = get_post_types( array( 'public' => true ), 'objects' );38		unset( $post_types['attachment'] );39 40		$post_types = array_filter( $post_types, 'is_post_type_viewable' );41 42		/**43		 * Filters the list of post object sub types available within the sitemap.44		 *45		 * @since 5.5.046		 *47		 * @param WP_Post_Type[] $post_types Array of registered post type objects keyed by their name.48		 */49		return apply_filters( 'wp_sitemaps_post_types', $post_types );50	}51 52	/**53	 * Gets a URL list for a post type sitemap.54	 *55	 * @since 5.5.056	 * @since 5.9.0 Renamed `$post_type` to `$object_subtype` to match parent class57	 *              for PHP 8 named parameter support.58	 *59	 * @param int    $page_num       Page of results.60	 * @param string $object_subtype Optional. Post type name. Default empty.61	 *62	 * @return array[] Array of URL information for a sitemap.63	 */64	public function get_url_list( $page_num, $object_subtype = '' ) {65		// Restores the more descriptive, specific name for use within this method.66		$post_type = $object_subtype;67 68		// Bail early if the queried post type is not supported.69		$supported_types = $this->get_object_subtypes();70 71		if ( ! isset( $supported_types[ $post_type ] ) ) {72			return array();73		}74 75		/**76		 * Filters the posts URL list before it is generated.77		 *78		 * Returning a non-null value will effectively short-circuit the generation,79		 * returning that value instead.80		 *81		 * @since 5.5.082		 *83		 * @param array[]|null $url_list  The URL list. Default null.84		 * @param string       $post_type Post type name.85		 * @param int          $page_num  Page of results.86		 */87		$url_list = apply_filters(88			'wp_sitemaps_posts_pre_url_list',89			null,90			$post_type,91			$page_num92		);93 94		if ( null !== $url_list ) {95			return $url_list;96		}