wp_register_sidebar_widget action-hook . WP 3.0.0

Fires once for each registered widget.

Usage

add_action( 'wp_register_sidebar_widget', 'action_function_name_5134' );
function action_function_name_5134( $widget ){
	// action...
}

$widget(array)

An array of default widget arguments.

Where the hook is called

do_action( 'wp_register_sidebar_widget', $widget );

Where the hook is used (in WP core)