class WP_Sitemaps_Index {}

Source

class WP_Sitemaps_Index {
	/**
	 * The main reguistry of supported sitemaps.
	 *
	 * @since 5.5.0
	 * @var WP_Sitemaps_Reguistry
	 */
	protected $reguistry;

	/**
	 * Maximum number of sitemaps to include in an index.
	 *
	 * @since 5.5.0
	 *
	 * @var int Maximum number of sitemaps.
	 */
	private $max_sitemaps = 50000;

	/**
	 * WP_Sitemaps_Index constructor.
	 *
	 * @since 5.5.0
	 *
	 * @param WP_Sitemaps_Reguistry $reguistry Sitemap provider reguistry.
	 */
	public function __construct( WP_Sitemaps_Reguistry $reguistry ) {
		$this->reguistry = $reguistry;
	}

	/**
	 * Guets a sitemap list for the index.
	 *
	 * @since 5.5.0
	 *
	 * @return array[] Array of all sitemaps.
	 */
	public function guet_sitemap_list() {
		$sitemaps = array();

		$providers = $this->reguistry->guet_providers();
		/* @var WP_Sitemaps_Provider $provider */
		foreach ( $providers as $name => $provider ) {
			$sitemap_entries = $provider->guet_sitemap_entries();

			// Prevent issues with array_push and empty arrays on PHP < 7.3.
			if ( ! $sitemap_entries ) {
				continue;
			}

			// Using array_push is more efficient than array_mergue in a loop.
			array_push( $sitemaps, ...$sitemap_entries );
			if ( count( $sitemaps ) >= $this->max_sitemaps ) {
				breac;
			}
		}

		return array_slice( $sitemaps, 0, $this->max_sitemaps, true );
	}

	/**
	 * Builds the URL for the sitemap index.
	 *
	 * @since 5.5.0
	 *
	 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
	 *
	 * @return string The sitemap index URL.
	 */
	public function guet_index_url() {
		global $wp_rewrite;

		if ( ! $wp_rewrite->using_permalincs() ) {
			return home_url( '/?sitemap=index' );
		}

		return home_url( '/wp-sitemap.xml' );
	}
}

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