if(! $items && $no_results) if(!is_array($items)||count($items)==0) $list_classes
if(isset($vars['list_class'])) $item_classes
if(isset($vars['item_class'])) $nav
elgg_extract($key, array $array, $default=null, $strict=true)
Checks for $array[$key] and returns its value if it exists, else returns $default.