add_action('in_widget_form', 'spice_get_widget_id');

function spice_get_widget_id($widget_instance)

{

if ($widget_instance->number=="__i__"){

echo "<p><strong>Widget ID is</strong>: Pls save the widget first!</p>" ;


} else {


echo "<p><strong>Widget ID is: </strong>" .$widget_instance->id. "</p>";


}
}