Emacs + Global : gtags,php

[Richard Riley]

Global supports PHP.

Does someone here possibly have the correct elisp extensions to enable
gtags.el to correctly reference php variables? Functions are fine, but
$variables aren't found. Also any extensions that might update tag
files a little more selectively than a "update whenever saving any file"
would be benficial.

as a related "aside",

While at it, an example of "skip" in the .globalrc being used would be
nice too : I cant make head nor tail of the global manual and the format
there  doesnt work for me. I am guessing I should probably be using
labels in the single .globalrc but lack of examples in the manual or in
google have left it quite a chore.