<?php 
/** 
 * Sitemaps: Public functions 
 * 
 * This file contains a variety of public functions developers can use to interact with 
 * the XML Sitemaps API. 
 * 
 * @package WordPress 
 * @subpackage Sitemaps 
 * @since 5.5.0 
 */ 
 
/** 
 * Retrieves the current Sitemaps server instance. 
 * 
 * @since 5.5.0 
 * 
 * @global WP_Sitemaps $wp_sitemaps Global Core Sitemaps instance. 
 * 
 * @return WP_Sitemaps Sitemaps instance. 
 */ 
function wp_sitemaps_get_server() { 
    global $wp_sitemaps; 
 
    // If there isn't a global instance, set and bootstrap the sitemaps system. 
    if ( empty( $wp_sitemaps ) ) { 
        $wp_sitemaps = new WP_Sitemaps(); 
        $wp_sitemaps->init(); 
 
        /** 
         * Fires when initializing the Sitemaps object. 
         * 
         * Additional sitemaps should be registered on this hook. 
         * 
         * @since 5.5.0 
         * 
         * @param WP_Sitemaps $wp_sitemaps Sitemaps object. 
         */ 
        do_action( 'wp_sitemaps_init', $wp_sitemaps ); 
    } 
 
    return $wp_sitemaps; 
} 
 
/** 
 * Gets an array of sitemap providers. 
 * 
 * @since 5.5.0 
 * 
 * @return WP_Sitemaps_Provider[] Array of sitemap providers. 
 */ 
function wp_get_sitemap_providers() { 
    $sitemaps = wp_sitemaps_get_server(); 
 
    return $sitemaps->registry->get_providers(); 
} 
 
/** 
 * Registers a new sitemap provider. 
 * 
 * @since 5.5.0 
 * 
 * @param string               $name     Unique name for the sitemap provider. 
 * @param WP_Sitemaps_Provider $provider The `Sitemaps_Provider` instance implementing the sitemap. 
 * @return bool Whether the sitemap was added. 
 */ 
function wp_register_sitemap_provider( $name, WP_Sitemaps_Provider $provider ) { 
    $sitemaps = wp_sitemaps_get_server(); 
 
    return $sitemaps->registry->add_provider( $name, $provider ); 
} 
 
/** 
 * Gets the maximum number of URLs for a sitemap. 
 * 
 * @since 5.5.0 
 * 
 * @param string $object_type Object type for sitemap to be filtered (e.g. 'post', 'term', 'user'). 
 * @return int The maximum number of URLs. 
 */ 
function wp_sitemaps_get_max_urls( $object_type ) { 
    /** 
     * Filters the maximum number of URLs displayed on a sitemap. 
     * 
     * @since 5.5.0 
     * 
     * @param int    $max_urls    The maximum number of URLs included in a sitemap. Default 2000. 
     * @param string $object_type Object type for sitemap to be filtered (e.g. 'post', 'term', 'user'). 
     */ 
    return apply_filters( 'wp_sitemaps_max_urls', 2000, $object_type ); 
} 
 
/** 
 * Retrieves the full URL for a sitemap. 
 * 
 * @since 5.5.1 
 * 
 * @param string $name         The sitemap name. 
 * @param string $subtype_name The sitemap subtype name. Default empty string. 
 * @param int    $page         The page of the sitemap. Default 1. 
 * @return string|false The sitemap URL or false if the sitemap doesn't exist. 
 */ 
function get_sitemap_url( $name, $subtype_name = '', $page = 1 ) { 
    $sitemaps = wp_sitemaps_get_server(); 
 
    if ( ! $sitemaps ) { 
        return false; 
    } 
 
    if ( 'index' === $name ) { 
        return $sitemaps->index->get_index_url(); 
    } 
 
    $provider = $sitemaps->registry->get_provider( $name ); 
    if ( ! $provider ) { 
        return false; 
    } 
 
    if ( $subtype_name && ! in_array( $subtype_name, array_keys( $provider->get_object_subtypes() ), true ) ) { 
        return false; 
    } 
 
    $page = absint( $page ); 
    if ( 0 >= $page ) { 
        $page = 1; 
    } 
 
    return $provider->get_sitemap_url( $subtype_name, $page ); 
} 
 
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