@ -44,7 +44,14 @@ abstract class Image extends File
*/
public static function getIsSubClass($class)
{
return (get_parent_class($class) == __CLASS__);
$parent_class = get_parent_class($class);
if ($parent_class == __CLASS__) {
return true;
}
if (get_parent_class($parent_class)) {
return self::getIsSubClass($parent_class);
return false;
public static function getSizes()