the_widget action-hook . WP 3.0.0

Fires before rendering the requested widget.

Usage

add_action( 'the_widget', 'action_function_name_1229', 10, 3 );
function action_function_name_1229( $widget, $instance, $args ){
	// action...
}

$widget(string)

The widget's class name.

$instance(array)

The current widget instance's settings.

$args(array)

An array of the widget's sidebar arguments.

Where the hook is called

do_action( 'the_widget', $widget, $instance, $args );

Where the hook is used (in WP core)