PHPTMAPI implements a PHP API for manipulating topic maps, based on the TMAPI project.
TMAPI is a programming interface for accessing and manipulating data held in a topic map. The TMAPI specification defines a set of core interfaces which must be implemented by a compliant application as well as (eventually) a set of additional interfaces which may be implemented by a compliant application or which may be built upon the core interfaces.
Please contact me if you want to contribute to the project.