[TxMt] Using Function/Method symbols in Snippets

I wrote a PHP Snippet that outputs some FirePHP-based debugging information.

fb($${1:variable}, '${2:function} $${1:label}');

I would like to replace ${2:function} with something that automatically puts in the current function or class::method (if available);

I notice in the status bar at the bottom of the editor window (to the right of the Tab Size), there is a "Symbol Popup" menu. So it seems like the information I need is available. Is there a variable in TextMate that I can slap into the snippet? A $TM_CURRENT_SYMBOL or something?

Thanks for your help!

Regards,

Daniel Royer