The new plan would be to do this via introspecting the zend engine.

This was planned to be done via Parrakeet and ParrotLanguage

http://parrakeet.joeysmith.com/ is gone, http://pirate.versionhost.com/viewcvs.cgi/parrakeet/#dirlist

Obviously via Parrot it will be Possible to introspect better http://phplens.com/phpeverywhere/?q=node/view/91 http://alpha-geek.com/2003/04/15/the_primordial_beginnings_of_php5_parrot http://www.akbkhome.com/blog.php/View/25/Pint__PHP_in_Parrot.html http://phplens.com/phpeverywhere/?q=node/view/84