As the sun rises and the forest mist clears, and the clouds return and the caves darken, these changes of light and shadow are the morning and evening in the mountains. Wildflowers bloom with their subtle fragrance, fine trees flourish with their dense shade, the wind and frost are pure and clean, and the water recedes to reveal the rocks—these are the four seasons in the mountains. Going out in the morning and returning in the evening, the scenery of the four seasons is different, and the joy is endless.至于负者歌于途,行者休于树,前者呼,后者应,伛偻提携,往来而不绝者,滁人游也。临溪而渔,溪深而鱼肥,酿泉为酒,泉香而酒洌,山肴野蔌,杂然而前陈者,太守宴也。宴酣之乐,非丝非竹,射者中,弈者胜,觥筹交错,起坐而喧哗者,众宾欢也。苍颜白发,颓然乎其间者,太守醉也。
<?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 );
}