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is_active_widget( callable|false $callback = false, int|false $widget_id = false, string|false $id_base = false, bool $skip_inactive = true )

Determines whether a given widget is displayed on the front end.

Description

Either $callback or $id_base can be used $id_base is the first argument when extending WP_Widget class Without the optional $widget_id parameter, returns the ID of the first sidebar in which the first instance of the widget with the given callback or $id_base is found. With the $widget_id parameter, returns the ID of the sidebar where the widget with that callback/$id_base AND that ID is found.

NOTE: $widget_id and $id_base are the same for single widgets. To be effective this function has to run after widgets have initialized, at action ‘init’ or later.

For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.

Parameters

$callback

(callable|false) (Optional) Widget callback to check.

Default value: false

$widget_id

(int|false) (Optional) Widget ID. Optional, but needed for checking.

Default value: false

$id_base

(string|false) (Optional) The base ID of a widget created by extending WP_Widget.

Default value: false

$skip_inactive

(bool) (Optional) Whether to check in 'wp_inactive_widgets'.

Default value: true

Return

(string|false) False if widget is not active or id of sidebar in which the widget is active.

Source

File: wp-includes/widgets.php 

function is_active_widget( $callback = false, $widget_id = false, $id_base = false, $skip_inactive = true ) {
	global $wp_registered_widgets;

	$sidebars_widgets = wp_get_sidebars_widgets();

	if ( is_array( $sidebars_widgets ) ) {
		foreach ( $sidebars_widgets as $sidebar => $widgets ) {
			if ( $skip_inactive && ( 'wp_inactive_widgets' === $sidebar || 'orphaned_widgets' === substr( $sidebar, 0, 16 ) ) ) {
				continue;
			}

			if ( is_array( $widgets ) ) {
				foreach ( $widgets as $widget ) {
					if ( ( $callback && isset( $wp_registered_widgets[ $widget ]['callback'] ) && $wp_registered_widgets[ $widget ]['callback'] === $callback ) || ( $id_base && _get_widget_id_base( $widget ) === $id_base ) ) {
						if ( ! $widget_id || $widget_id === $wp_registered_widgets[ $widget ]['id'] ) {
							return $sidebar;
						}
					}
				}
			}
		}
	}
	return false;
}

Changelog

Version Description
2.2.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/is_active_widget