WP_Sitemaps_Index

18#[AllowDynamicProperties]19class WP_Sitemaps_Index {20	/**21	 * The main registry of supported sitemaps.22	 *23	 * @since 5.5.024	 * @var WP_Sitemaps_Registry25	 */26	protected $registry;27 28	/**29	 * Maximum number of sitemaps to include in an index.30	 *31	 * @since 5.5.032	 *33	 * @var int Maximum number of sitemaps.34	 */35	private $max_sitemaps = 50000;36 37	/**38	 * WP_Sitemaps_Index constructor.39	 *40	 * @since 5.5.041	 *42	 * @param WP_Sitemaps_Registry $registry Sitemap provider registry.43	 */44	public function __construct( WP_Sitemaps_Registry $registry ) {45		$this->registry = $registry;46	}47 48	/**49	 * Gets a sitemap list for the index.50	 *51	 * @since 5.5.052	 *53	 * @return array[] Array of all sitemaps.54	 */55	public function get_sitemap_list() {56		$sitemaps = array();57 58		$providers = $this->registry->get_providers();59		/* @var WP_Sitemaps_Provider $provider */60		foreach ( $providers as $name => $provider ) {61			$sitemap_entries = $provider->get_sitemap_entries();62 63			// Prevent issues with array_push and empty arrays on PHP < 7.3.64			if ( ! $sitemap_entries ) {65				continue;66			}67 68			// Using array_push is more efficient than array_merge in a loop.69			array_push( $sitemaps, ...$sitemap_entries );70			if ( count( $sitemaps ) >= $this->max_sitemaps ) {71				break;72			}73		}74 75		return array_slice( $sitemaps, 0, $this->max_sitemaps, true );76	}77 78	/**79	 * Builds the URL for the sitemap index.80	 *81	 * @since 5.5.082	 *83	 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.84	 *85	 * @return string The sitemap index URL.86	 */87	public function get_index_url() {88		global $wp_rewrite;89 90		if ( ! $wp_rewrite->using_permalinks() ) {91			return home_url( '/?sitemap=index' );92		}93 94		return home_url( '/wp-sitemap.xml' );95	}96}