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

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

$callbackcallable|falseoptional
Widget callback to check.

Default:false

$widget_idstring|falseoptional
Widget ID. Optional, but needed for checking.

Default:false

$id_basestring|falseoptional
The base ID of a widget created by extending WP_Widget.

Default:false

$skip_inactivebooloptional
Whether to check in 'wp_inactive_widgets'.

Default:true

Return

string|false ID of the sidebar in which the widget is active, false if the widget is not active.

Source

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 || str_starts_with( $sidebar, 'orphaned_widgets' ) ) ) {
				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

VersionDescription
2.2.0Introduced.

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