Is there a synonym or thesaurus library available for php?

hi all,

i'm currently designing a search engine. I'd like certain keywords to
have affiliated synonyms listed so that I can find out which keywords
are symantically related to each other.
Is there a thesaurus available that I can install on the server and
query via php, or possibly a server on the net that takes web-queries
and returns synonyms?
I am aware of word-net
http://www.cogsci.princeton.edu/~wn/wn1.7.1.shtml as a possible
solution. Has anyone tried installing the unix version and accessing
via php?

pls cc 'axup@userdesign.com' with any responses.
cheers,
Jaffa