) ](https://developer.wordpress.org/reference/classes/wp_site_health/get_test_rest_availability/) ` wp-admin/includes/class-wp-site-health.php ` |  Tests if the REST API is accessible.   
[ WP_Site_Health::get_tests() ](https://developer.wordpress.org/reference/classes/wp_site_health/get_tests/) ` wp-admin/includes/class-wp-site-health.php ` |  Returns a set of tests that belong to the site status page.   
[ WP_Site_Health::can_perform_loopback() ](https://developer.wordpress.org/reference/classes/wp_site_health/can_perform_loopback/) ` wp-admin/includes/class-wp-site-health.php ` |  Runs a loopback test on the site.   
[ WP_Site_Health::get_test_php_extensions() ](https://developer.wordpress.org/reference/classes/wp_site_health/get_test_php_extensions/) ` wp-admin/includes/class-wp-site-health.php ` |  Tests if required PHP modules are installed on the host.   
[ WP_Posts_List_Table::formats_dropdown() ](https://developer.wordpress.org/reference/classes/wp_posts_list_table/formats_dropdown/) ` wp-admin/includes/class-wp-posts-list-table.php ` |  Displays a formats drop-down for filtering items.   
[ WP_Site_Health_Auto_Updates::test_accepts_dev_updates() ](https://developer.wordpress.org/reference/classes/wp_site_health_auto_updates/test_accepts_dev_updates/) ` wp-admin/includes/class-wp-site-health-auto-updates.php ` |  Checks if the install is using a development branch and can use nightly packages.   
[ WP_Site_Health_Auto_Updates::test_accepts_minor_updates() ](https://developer.wordpress.org/reference/classes/wp_site_health_auto_updates/test_accepts_minor_updates/) ` wp-admin/includes/class-wp-site-health-auto-updates.php ` |  Checks if the site supports automatic minor updates.   
[ WP_Site_Health_Auto_Updates::test_filters_automatic_updater_disabled() ](https://developer.wordpress.org/reference/classes/wp_site_health_auto_updates/test_filters_automatic_updater_disabled/) ` wp-admin/includes/class-wp-site-health-auto-updates.php ` |  Checks if automatic updates are disabled by a filter.   
[ WP_Site_Health_Auto_Updates::test_vcs_abspath() ](https://developer.wordpress.org/reference/classes/wp_site_health_auto_updates/test_vcs_abspath/) ` wp-admin/includes/class-wp-site-health-auto-updates.php ` |  Checks if WordPress is controlled by a VCS (Git, Subversion etc).   
[ wp_get_direct_php_update_url() ](https://developer.wordpress.org/reference/functions/wp_get_direct_php_update_url/) ` wp-includes/functions.php ` |  Gets the URL for directly updating the PHP version the site is running on.   
[ wp_targeted_link_rel_callback() ](https://developer.wordpress.org/reference/functions/wp_targeted_link_rel_callback/) ` wp-includes/formatting.php ` |  Callback to add ` rel="noopener" ` string to HTML A element.   
[ wp_using_themes() ](https://developer.wordpress.org/reference/functions/wp_using_themes/) ` wp-includes/load.php ` |  Determines whether the current request should use themes.   
[ wp_get_ready_cron_jobs() ](https://developer.wordpress.org/reference/functions/wp_get_ready_cron_jobs/) ` wp-includes/cron.php ` |  Retrieves cron jobs ready to be run.   
[ wp_get_scheduled_event() ](https://developer.wordpress.org/reference/functions/wp_get_scheduled_event/) ` wp-includes/cron.php ` |  Retrieves a scheduled event.   
[ wp_initialize_site() ](https://developer.wordpress.org/reference/functions/wp_initialize_site/) ` wp-includes/ms-site.php ` |  Runs the initialization routine for a given site.   
[ wp_uninitialize_site() ](https://developer.wordpress.org/reference/functions/wp_uninitialize_site/) ` wp-includes/ms-site.php ` |  Runs the uninitialization routine for a given site.   
[ wp_is_site_initialized() ](https://developer.wordpress.org/reference/functions/wp_is_site_initialized/) ` wp-includes/ms-site.php ` |  Checks whether a site is initialized.   
[ wp_prepare_site_data() ](https://developer.wordpress.org/reference/functions/wp_prepare_site_data/) ` wp-includes/ms-site.php ` |  Prepares site data for insertion or up