Un-registers a widget.
<?php unregister_widget( $widget_class ) ?>
$widget_class (object) The name of a class that extends WP_Widget
WP_Widget_Pages = Pages Widget WP_Widget_Calendar = Calendar Widget WP_Widget_Archives = Archives Widget WP_Widget_Links = Links Widget WP_Widget_Media_Audio = Audio Player Media Widget WP_Widget_Media_Image = Image Media Widget WP_Widget_Media_Video = Video Media Widget WP_Widget_Meta = Meta Widget WP_Widget_Search = Search Widget WP_Widget_Text = Text Widget WP_Widget_Categories = Categories Widget WP_Widget_Recent_Posts = Recent Posts Widget WP_Widget_Recent_Comments = Recent Comments Widget WP_Widget_RSS = RSS Widget WP_Widget_Tag_Cloud = Tag Cloud Widget WP_Nav_Menu_Widget = Menus Widget WP_Widget_Custom_HTML = Custom HTML Widget
Example
This will unregister the built-in WP_Widget_Calendar widget
function remove_calendar_widget() {
unregister_widget('WP_Widget_Calendar');
}
add_action( 'widgets_init', 'remove_calendar_widget' );