public function deleteDirectory($arg) {
        foreach (func_get_args() as $name) {
            (new static($this->fullName.'/'.$name))->delete();
        }
        return true;
    }
public function deleteDirectory($arg) {
        foreach (func_get_args() as $name) {
            (new static($this->fullName.'/'.$name))->delete();
        }
        return true;
    }
public function deleteDirectory ( $ arg ) { foreach ( func_get_args ( ) as $ name ) { ( new static ( $ this -> fullName . '/' . $ name ) ) -> delete ( ) ; } return true ; }
DELETE DIRECTORIES IN CHILDREN
@param string $arg
@return bool
DELETE DIRECTORIES IN CHILDREN