is_registered_sidebar( string|int $sidebar_id )

Checks if a sidebar is registered.

Parameters

$sidebar_id: (string|int) (Required) The ID of the sidebar when it was registered.

(bool) True if the sidebar is registered, false otherwise.

function is_registered_sidebar( $sidebar_id ) {
	global $wp_registered_sidebars;

	return isset( $wp_registered_sidebars[ $sidebar_id ] );
}

Used By
Used By	Description
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::filter_dynamic_sidebar_params()	Inject selective refresh data attributes into widget container elements.
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::render_widget_partial()	Renders a specific widget using the supplied sidebar arguments.
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::customize_register()	Registers Customizer settings and controls for all sidebars and widgets.
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::tally_sidebars_via_is_active_sidebar_calls()	Tallies the sidebars rendered via is_active_sidebar().
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::tally_sidebars_via_dynamic_sidebar_calls()	Tallies the sidebars rendered via dynamic_sidebar().
wp-includes/widgets.php: register_sidebars()	Creates multiple sidebars.

Changelog
Version	Description
WP-4.4.0	Introduced.