# phpman > man > CGI::Session::Serialize::default(3pm)

## NAME
    [CGI::Session::Serialize::default](https://www.chedong.com/phpMan.php/perldoc/CGI%3A%3ASession%3A%3ASerialize%3A%3Adefault/markdown) - Default [CGI::Session](https://www.chedong.com/phpMan.php/perldoc/CGI%3A%3ASession/markdown) serializer

## DESCRIPTION
    This library is used by [CGI::Session](https://www.chedong.com/phpMan.php/perldoc/CGI%3A%3ASession/markdown) driver to serialize session data before storing it in disk.

    All the methods are called as class methods.

## METHODS
### freeze
        Receives two arguments. First is the class name, the second is the data to be serialized.
        Should return serialized string on success, undef on failure. Error message should be set
        using "set_error()|[CGI::Session::ErrorHandler](https://www.chedong.com/phpMan.php/perldoc/CGI%3A%3ASession%3A%3AErrorHandler/markdown)/"set_error()""

### thaw
        Received two arguments. First is the class name, second is the *frozen* data string. Should
        return thawed data structure on success, undef on failure. Error message should be set using
        "set_error()|[CGI::Session::ErrorHandler](https://www.chedong.com/phpMan.php/perldoc/CGI%3A%3ASession%3A%3AErrorHandler/markdown)/"set_error()""

## LICENSING
    For support and licensing see [CGI::Session](https://www.chedong.com/phpMan.php/perldoc/CGI%3A%3ASession/markdown)