执行文件保存操作
null Core_Upload::save_to_file( )
protected function save_to_file()
{
// 默认文件上传形式
$filename = $this->config['upload_path'] . $this->file['name'];
if (!@move_uploaded_file($this->file['temp'], $filename))
{
throw new Exception('Upload destination error.', Upload::ERR_SAVE_FILE);
}
// 设置文件权限
@chmod('0644', $filename);
}