Hi Cliff,
Do you have a recent copy of the nginx.php GeSHi language file? I opened a request at the SourceForge project tracker here ( https://sourceforge.net/tracker/?func=detail&aid=3554024&group_id=114997&atid=670234 ) to have the copy you've already provided added, but if there is a newer file I'd like to provide it to them.
Do you happen to have it in a repo somewhere? I looked through the nginx SVN repo and didn't see it there.
Thanks.