wp_cache_get_last_changed() WordPress Function

function wp_cache_get_last_changed( $group ) {
	$last_changed = wp_cache_get( 'last_changed', $group );

	if ( ! $last_changed ) {
		$last_changed = microtime();
		wp_cache_set( 'last_changed', $last_changed, $group );
	}

	return $last_changed;
}
Uses	Description
wp-includes/cache.php:wp_cache_get()	Retrieves the cache contents from the cache by key and group.
wp-includes/cache.php:wp_cache_set()	Saves the data to the cache.
Used By	Description
wp-includes/class-wp-term-query.php:WP_Term_Query::get_terms()	Retrieves the query results.
wp-includes/class-wp-network-query.php:WP_Network_Query::get_networks()	Gets a list of networks matching the query vars.
wp-includes/class-wp-site-query.php:WP_Site_Query::get_sites()	Retrieves a list of sites matching the query vars.
wp-includes/class-wp-comment-query.php:WP_Comment_Query::fill_descendants()	Fetch descendants for located comments.
wp-includes/class-wp-comment-query.php:WP_Comment_Query::get_comments()	Get a list of comments matching the query vars.
wp-includes/general-template.php:wp_get_archives()	Display archive links based on type and format.
wp-includes/class-wp-query.php:WP_Query::get_posts()	Retrieves an array of posts based on query variables.
wp-includes/taxonomy.php:get_objects_in_term()	Retrieves object IDs of valid taxonomy and term.
wp-includes/post.php:get_page_by_path()	Retrieves a page given its path.
wp-includes/post.php:get_pages()	Retrieve an array of pages (or hierarchical post type items).