Title: 5.5.1 | Developer.WordPress.org

---

# New and updated in 5.5.1

Functions

Hooks

Classes

Methods

 * function[get_sitemap_url()](https://developer.wordpress.org/reference/functions/get_sitemap_url/)
 * Retrieves the full URL for a sitemap.
 * Used by [1 function](https://developer.wordpress.org/reference/functions/get_sitemap_url/#used-by)
   | Uses [2 functions](https://developer.wordpress.org/reference/functions/get_sitemap_url/#uses)
   | Source: [wp-includes/sitemaps.php:103](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/sitemaps.php#L103-L129)
 * function[wp_get_environment_type()](https://developer.wordpress.org/reference/functions/wp_get_environment_type/)
 * Retrieves the current environment type.
 * Used by [7 functions](https://developer.wordpress.org/reference/functions/wp_get_environment_type/#used-by)
   | Uses [2 functions](https://developer.wordpress.org/reference/functions/wp_get_environment_type/#uses)
   | Source: [wp-includes/load.php:250](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/load.php#L250-L299)
 * hook[auto_theme_update_send_email](https://developer.wordpress.org/reference/hooks/auto_theme_update_send_email/)
 * Filters whether to send an email following an automatic background theme update.
 * Used by [1 function](https://developer.wordpress.org/reference/hooks/auto_theme_update_send_email/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/hooks/auto_theme_update_send_email/#uses)
   | Source: [wp-admin/includes/class-wp-automatic-updater.php:1200](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-wp-automatic-updater.php#L1200-L1200)
 * hook[auto_plugin_update_send_email](https://developer.wordpress.org/reference/hooks/auto_plugin_update_send_email/)
 * Filters whether to send an email following an automatic background plugin update.
 * Used by [1 function](https://developer.wordpress.org/reference/hooks/auto_plugin_update_send_email/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/hooks/auto_plugin_update_send_email/#uses)
   | Source: [wp-admin/includes/class-wp-automatic-updater.php:1177](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-wp-automatic-updater.php#L1177-L1177)
 * method[WP_Site_Health_Auto_Updates::test_constants()](https://developer.wordpress.org/reference/classes/wp_site_health_auto_updates/test_constants/)
 * Tests if auto-updates related constants are set correctly.
 * Used by [1 function](https://developer.wordpress.org/reference/classes/wp_site_health_auto_updates/test_constants/#used-by)
   | Uses [2 functions](https://developer.wordpress.org/reference/classes/wp_site_health_auto_updates/test_constants/#uses)
   | Source: [wp-admin/includes/class-wp-site-health-auto-updates.php:72](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-wp-site-health-auto-updates.php#L72-L88)
 * function[get_custom_logo()](https://developer.wordpress.org/reference/functions/get_custom_logo/)
 * Returns a custom logo, linked to home unless the theme supports removing the 
   link on the home page.
 * Used by [2 functions](https://developer.wordpress.org/reference/functions/get_custom_logo/#used-by)
   | Uses [19 functions](https://developer.wordpress.org/reference/functions/get_custom_logo/#uses)
   | Source: [wp-includes/general-template.php:1062](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/general-template.php#L1062-L1157)