<?php

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/**

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* Sitemaps: WP_Sitemaps_Index class.

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*

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* Generates the sitemap index.

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*

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* @package WordPress

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* @subpackage Sitemaps

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* @since 5.5.0

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*/

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/**

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* Class WP_Sitemaps_Index.

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* Builds the sitemap index page that lists the links to all of the sitemaps.

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*

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* @since 5.5.0

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*/

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#[AllowDynamicProperties]

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class WP_Sitemaps_Index {

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/**

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* The main registry of supported sitemaps.

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*

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* @since 5.5.0

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* @var WP_Sitemaps_Registry

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*/

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protected $registry;

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/**

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* Maximum number of sitemaps to include in an index.

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*

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* @since 5.5.0

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*

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* @var int Maximum number of sitemaps.

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*/

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private $max_sitemaps = 50000;

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/**

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* WP_Sitemaps_Index constructor.

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*

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* @since 5.5.0

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*

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* @param WP_Sitemaps_Registry $registry Sitemap provider registry.

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*/

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public function __construct( WP_Sitemaps_Registry $registry ) {

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$this->registry = $registry;

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}

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/**

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* Gets a sitemap list for the index.

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*

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* @since 5.5.0

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*

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* @return array[] Array of all sitemaps.

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*/

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public function get_sitemap_list() {

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$sitemaps = array();

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$providers = $this->registry->get_providers();

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/* @var WP_Sitemaps_Provider $provider */

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foreach ( $providers as $name => $provider ) {

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$sitemap_entries = $provider->get_sitemap_entries();

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// Prevent issues with array_push and empty arrays on PHP < 7.3.

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if ( ! $sitemap_entries ) {

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continue;

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}

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// Using array_push is more efficient than array_merge in a loop.

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array_push( $sitemaps, ...$sitemap_entries );

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if ( count( $sitemaps ) >= $this->max_sitemaps ) {

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break;

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}

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}

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

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}

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/**

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* Builds the URL for the sitemap index.

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*

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* @since 5.5.0

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*

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* @global WP_Rewrite $wp_rewrite WordPress rewrite component.

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*

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* @return string The sitemap index URL.

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*/

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public function get_index_url() {

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global $wp_rewrite;

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if ( ! $wp_rewrite->using_permalinks() ) {

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return home_url( '/?sitemap=index' );

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}

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

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}

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}

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