is_admin() WordPress Function

function is_admin() {
	if ( isset( $GLOBALS['current_screen'] ) ) {
		return $GLOBALS['current_screen']->in_admin();
	} elseif ( defined( 'WP_ADMIN' ) ) {
		return WP_ADMIN;
	}

	return false;
}
Used By	Description
wp-includes/global-styles-and-settings.php:wp_get_global_styles_svg_filters()	Returns a string containing the SVGs to be referenced as filters (duotone).
wp-includes/script-loader.php:_wp_theme_json_webfonts_handler()	Runs the theme.json webfonts handler.
wp-includes/script-loader.php:wp_global_styles_render_svg_filters()	Renders the SVG filters supplied by theme.json.
wp-includes/global-styles-and-settings.php:wp_get_global_stylesheet()	Returns the stylesheet resulting of merging core, theme, and user data.
wp-includes/media.php:wp_get_loading_attr_default()	Gets the default value to use for a `loading` attribute on an element.
wp-includes/admin-bar.php:wp_admin_bar_edit_site_menu()	Adds the “Edit site” link to the Toolbar.
wp-includes/script-loader.php:wp_should_load_separate_core_block_assets()	Checks whether separate styles should be loaded for core blocks on-render.
wp-includes/script-loader.php:wp_get_inline_script_tag()	Wraps inline JavaScript in tag.
wp-includes/script-loader.php:wp_sanitize_script_attributes()	Sanitizes an attributes array into an attributes string to be placed inside a tag.
wp-includes/script-loader.php:wp_get_script_tag()	Formats loader tags.
wp-includes/load.php:wp_is_site_protected_by_basic_auth()	Checks if this site is protected by HTTP Basic Auth.
wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php:WP_REST_Site_Health_Controller::load_admin_textdomain()	Loads the admin textdomain for Site Health tests.
wp-includes/load.php:is_protected_endpoint()	Determines whether we are currently on an endpoint that should be protected against WSODs.
wp-includes/class-wp-fatal-error-handler.php:WP_Fatal_Error_Handler::handle()	Runs the shutdown handler.
wp-admin/includes/class-wp-site-health.php:WP_Site_Health::check_wp_version_check_exists()	Test if `wp_version_check` is blocked.
wp-includes/l10n.php:determine_locale()	Determine the current locale desired for the request.
wp-includes/script-loader.php:wp_common_block_scripts_and_styles()	Handles the enqueueing of block scripts and styles that are common to both the editor and the front-end.
wp-includes/script-loader.php:wp_enqueue_registered_block_scripts_and_styles()	Enqueues registered block scripts and styles, depending on current rendered context (only enqueuing editor scripts while in context of the editor).
wp-admin/includes/plugin.php:wp_add_privacy_policy_content()	Declares a helper function for adding content to the Privacy Policy Guide.
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::establish_loaded_changeset()	Establishes the loaded changeset.
wp-includes/class-wp-editor.php:_WP_Editors::enqueue_default_editor()	Enqueue all editor scripts.
wp-includes/class-wp-taxonomy.php:WP_Taxonomy::set_props()	Sets taxonomy properties.
wp-includes/class-wp-taxonomy.php:WP_Taxonomy::add_rewrite_rules()	Adds the necessary rewrite rules for the taxonomy.
wp-includes/class-wp-post-type.php:WP_Post_Type::add_rewrite_rules()	Adds the necessary rewrite rules for the post type.
wp-includes/class-wp-post-type.php:WP_Post_Type::set_props()	Sets post type properties.
wp-includes/rest-api.php:get_rest_url()	Retrieves the URL to a REST endpoint on a site.
wp-includes/admin-bar.php:wp_admin_bar_customize_menu()	Adds the “Customize” link to the Toolbar.
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php:WP_Customize_Nav_Menu_Item_Setting::sort_wp_get_nav_menu_items()	Re-apply the tail logic also applied on $items by wp_get_nav_menu_items().
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::wp_loaded()	Registers styles/scripts and initialize the preview of each setting
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::wp_redirect_status()	Prevents Ajax requests from following redirects when previewing a theme by issuing a 200 response instead of a 30x.
wp-includes/class.wp-styles.php:WP_Styles::__construct()	Constructor.
wp-includes/theme.php:remove_editor_styles()	Removes all visual editor stylesheets.
wp-includes/theme.php:_custom_header_background_just_in_time()	Registers the internal custom header and background routines.
wp-includes/theme.php:_wp_customize_include()	Includes and instantiates the WP_Customize_Manager class.
wp-includes/theme.php:switch_theme()	Switches the theme.
wp-includes/theme.php:get_theme_mods()	Retrieves all theme modifications.
wp-includes/l10n.php:load_default_textdomain()	Load default translated strings based on locale.
wp-includes/general-template.php:wp_heartbeat_settings()	Default settings for heartbeat
wp-includes/deprecated.php:wp_admin_bar_dashboard_view_site_menu()	Add the “Dashboard”/”Visit Site” menu.
wp-includes/class-wp-theme.php:WP_Theme::get_allowed_on_site()	Returns array of stylesheet names of themes allowed on the site.
wp-includes/class-wp.php:WP::handle_404()	Set the Headers for 404, if nothing is found for requested URL.
wp-includes/class-wp.php:WP::parse_request()	Parses the request to find the correct WordPress query.
wp-includes/class-wp-query.php:WP_Query::parse_query()	Parse a query string and set query type booleans.
wp-includes/functions.wp-scripts.php:wp_deregister_script()	Remove a registered script.
wp-includes/functions.php:wp_auth_check_load()	Load the auth check for monitoring whether the user is still logged in.
wp-includes/widgets.php:wp_widget_rss_output()	Display the RSS entries in a list.
wp-includes/link-template.php:get_pagenum_link()	Retrieves the link for a page number.
wp-includes/class-wp-admin-bar.php:WP_Admin_Bar::_render()
wp-includes/admin-bar.php:wp_admin_bar_sidebar_toggle()	Adds the sidebar toggle button.
wp-includes/admin-bar.php:wp_admin_bar_site_menu()	Adds the “Site Name” menu.
wp-includes/admin-bar.php:wp_admin_bar_edit_menu()	Provides an edit link for posts and terms.
wp-includes/admin-bar.php:wp_admin_bar_search_menu()	Adds search form.
wp-includes/admin-bar.php:is_admin_bar_showing()	Determines whether the admin bar should be showing.
wp-includes/option.php:wp_user_settings()	Saves and restores user interface settings stored in a cookie.
wp-includes/post-template.php:get_post_class()	Retrieves an array of the class names for the post container element.
wp-includes/post-template.php:get_the_title()	Retrieves the post title.
wp-includes/media.php:wp_enqueue_media()	Enqueues all scripts, styles, settings, and templates necessary to use all media JS APIs.
wp-includes/media.php:wp_video_shortcode()	Builds the Video shortcode output.
wp-includes/media.php:image_constrain_size_for_editor()	Scale down the default size of an image.
wp-includes/post.php:wp_get_attachment_url()	Retrieve the URL for an attachment.
wp-includes/canonical.php:redirect_canonical()	Redirects incoming links to the proper URL based on the site url.
wp-includes/ms-load.php:ms_not_installed()	Displays a failure message.
wp-includes/post-formats.php:_post_format_request()	Filters the request to allow for the format prefix.
wp-includes/class.wp-scripts.php:WP_Scripts::init()	Initialize the class.
wp-includes/nav-menu.php:wp_get_nav_menu_items()	Retrieves all menu items of a navigation menu.
wp-includes/widgets.php:dynamic_sidebar()	Display dynamic sidebar.
wp-includes/widgets.php:wp_get_sidebars_widgets()	Retrieve full list of sidebars and their widget instance IDs.
wp-includes/widgets.php:wp_convert_widget_settings()	Converts the widget settings from single to multi-widget format.
wp-includes/class-wp-customize-widgets.php:WP_Customize_Widgets::schedule_customize_register()	Ensures widgets are available for all types of previews.
wp-includes/script-loader.php:script_concat_settings()	Determines the concatenation and compression settings for scripts and styles.
wp-includes/script-loader.php:wp_default_scripts()	Registers all WordPress scripts.
wp-includes/class-wp-editor.php:_WP_Editors::editor_settings()
wp-includes/class-wp-editor.php:_WP_Editors::editor_js()	Print (output) the TinyMCE configuration and initialization scripts.