org\Upload::getSubPath PHP Method

    private function getSubPath($filename)
    {
        $subpath = '';
        $rule = $this->subName;
        if ($this->autoSub && !empty($rule)) {
            $subpath = $this->getName($rule, $filename) . '/';
            if (!empty($subpath) && !$this->uploader->mkdir($this->savePath . $subpath)) {
                $this->error = $this->uploader->getError();
                return false;
            }
        }
        return $subpath;
    }