Serialized PHP

Serialized PHP is a supported response format for the SmugMug API as of version 1.2.0

Don't be fooled by the name - serialized PHP can be used by many other languages, too.  It just happens to have been created and used by PHP first. 

See also:

• serialize() and unserialize() in the PHP docs
• Yahoo's excellent page on their serialized PHP interface to their APIs