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<?php
//* Add page slug as id to widget title 
add_filter('widget_title', 'add_slug_id_to_widget_title', 15, 3);
function add_slug_id_to_widget_title($title, $instance, $args){
	$page 	= get_page_by_title($title);
	$title 	= sprintf('<span id="%s">%s</span>', $page->post_name, $title);
	
	return $title;
}