/**
* Returns a temporary directory - one that is automatically deleted at the end
* of the script.
*
* @param string $ext
* @return Temp
*/
public static function temp_dir()
{
$ext = $ext ? '.' . $ext : '';
Temp::set_temp_root(api_get_path(SYS_ARCHIVE_PATH) . 'temp');
$path = Temp::get_temporary_name() . $ext;
return Temp::dir($path);
}