/**
* allows to retrieve files and directories with a . (dot) which are
* normally hidden
*
* @access public
* @param boolean $bool
* @return instance
**/
public static function showHidden($bool)
{
if (is_bool($bool)) {
self::$show_hidden = $bool;
}
if (self::$instance) {
return self::$instance;
}
}
