Limit get_terms to Posts in Query

Every now and then we need to create a list of taxonomies that are not just empty, but are also not found in the posts for that page.

I recently found a pretty sweet solution over on Stack Overflow and wanted to share.

$my_query = new WP_Query( $my_args );
$post_ids = wp_list_pluck( $my_query->posts, 'ID' );

$my_terms = get_terms( array(
		'taxonomy' => 'my-terms',
		'hide_empty' => true,
		'object_ids' => $post_ids,
	) );

$my_query = new WP_Query( $my_args );

$post_ids = wp_list_pluck( $my_query->posts, 'ID' );

$my_terms = get_terms( array(

'taxonomy' => 'my-terms',

'hide_empty' => true,

'object_ids' => $post_ids,

) );