/**
*
* @static \MUtil_Loader_CachedLoader $instance
* @param stirng $dir
* @return \MUtil_Loader_CachedLoader
*/
public static function getInstance($dir = null)
{
static $instance;
if (!$instance) {
$instance = new self($dir);
if (is_subclass_of('Zend_Loader', 'MUtil_Loader_LoaderMarkerInterface')) {
\Zend_Loader::setCachedLoader($instance);
}
}
return $instance;
}