/reference/functions/get_preview_post_link/) ` wp-includes/link-template.php ` |  Retrieves the URL used for the post preview.   
[ is_post_type_viewable() ](https://developer.wordpress.org/reference/functions/is_post_type_viewable/) ` wp-includes/post.php ` |  Determines whether a post type is considered “viewable”.   
[ update_network_option() ](https://developer.wordpress.org/reference/functions/update_network_option/) ` wp-includes/option.php ` |  Updates the value of a network option that was already added.   
[ add_network_option() ](https://developer.wordpress.org/reference/functions/add_network_option/) ` wp-includes/option.php ` |  Adds a new network option.   
[ get_network_option() ](https://developer.wordpress.org/reference/functions/get_network_option/) ` wp-includes/option.php ` |  Retrieves a network’s option value based on the option name.   
[ get_subdirectory_reserved_names() ](https://developer.wordpress.org/reference/functions/get_subdirectory_reserved_names/) ` wp-includes/ms-functions.php ` |  Retrieves a list of reserved site on a sub-directory Multisite installation.   
[ WP_Screen::render_view_mode() ](https://developer.wordpress.org/reference/classes/wp_screen/render_view_mode/) ` wp-admin/includes/class-wp-screen.php ` |  Renders the list table view mode preferences.   
[ WP_Users_List_Table::get_role_list() ](https://developer.wordpress.org/reference/classes/wp_users_list_table/get_role_list/) ` wp-admin/includes/class-wp-users-list-table.php ` |  Returns an array of translated user role names for a given user object.   
[ signup_get_available_languages() ](https://developer.wordpress.org/reference/functions/signup_get_available_languages/) ` wp-signup.php ` |  Retrieves languages available during the site/user sign-up process.   
[ WP_Customize_Nav_Menu_Setting::sanitize() ](https://developer.wordpress.org/reference/classes/wp_customize_nav_menu_setting/sanitize/) ` wp-includes/customize/class-wp-customize-nav-menu-setting.php ` |  Sanitize an input.   
[ WP_Customize_Nav_Menu_Item_Setting::value_as_wp_post_nav_menu_item() ](https://developer.wordpress.org/reference/classes/wp_customize_nav_menu_item_setting/value_as_wp_post_nav_menu_item/) ` wp-includes/customize/class-wp-customize-nav-menu-item-setting.php ` |  Get the value emulated into a [ WP_Post ](https://developer.wordpress.org/reference/classes/wp_post/) and set up as a nav_menu_item.   
[ WP_Customize_Nav_Menu_Item_Setting::sanitize() ](https://developer.wordpress.org/reference/classes/wp_customize_nav_menu_item_setting/sanitize/) ` wp-includes/customize/class-wp-customize-nav-menu-item-setting.php ` |  Sanitize an input.   
[ get_language_attributes() ](https://developer.wordpress.org/reference/functions/get_language_attributes/) ` wp-includes/general-template.php ` |  Gets the language attributes for the ‘html’ tag.   
[ wp_site_icon() ](https://developer.wordpress.org/reference/functions/wp_site_icon/) ` wp-includes/general-template.php ` |  Displays site icon meta tags.   
[ get_site_icon_url() ](https://developer.wordpress.org/reference/functions/get_site_icon_url/) ` wp-includes/general-template.php ` |  Returns the Site Icon URL.   
[ get_main_network_id() ](https://developer.wordpress.org/reference/functions/get_main_network_id/) ` wp-includes/functions.php ` |  Gets the main network ID.   
[ _deprecated_constructor() ](https://developer.wordpress.org/reference/functions/_deprecated_constructor/) ` wp-includes/functions.php ` |  Marks a constructor as deprecated and informs when it has been used.   
[ format_for_editor() ](https://developer.wordpress.org/reference/functions/format_for_editor/) ` wp-includes/formatting.php ` |  Formats text for the editor.   
[ get_default_comment_status() ](https://developer.wordpress.org/reference/functions/get_default_comment_status/) ` wp-includes/comment.php ` |  Gets the default comment status for a post type.   
[ WP_Customize_Nav_Menus::search_available_items_query() ](https://developer.wor