WordPress - Get the name and id of the widget area being used to display a certain widget. This adds the widget ID and widget area name as HTML comments to the frontend of the site

wordpress-get-widget-id-name.php

<?php
/**
 * Add the widget ID and widget name as HTML comments.
 *
 * Makes it easiser to identify exactly which widget area a widget is appearing in. 
 * This helps a lot with themes that have a lot of sidebars and uses a lot of widgets.
 */
function which_dynamic_sidebar( $sidebar_params ) {
	$sidebar_params['0']['class'] = empty( $sidebar_params['0']['class'] )?$sidebar_params['0']['id']:$sidebar_params['0']['class'].' '.$sidebar_params['0']['id'];
	$sidebar_params['0']['before_widget'] = '<!--Widget-Area:id:'.esc_attr($sidebar_params['0']['id']).';name:'.esc_attr($sidebar_params['0']['name']).'-->'.$sidebar_params['0']['before_widget'];
	return $sidebar_params;
}
add_filter( 'dynamic_sidebar_params', 'which_dynamic_sidebar', 10 );