You can subscribe here
http://lists.sourceforge.net/lists/listinfo/php4java-developer
All discussion will be there
i found yacc grammar in PHP source code
/Zend/zend_language_parser.y
/Zend/zend_language_scanner.l
I've place quick and dirty project home page at
http://php4java.sourceforge.net/
There are list of task for the project, summary for usfull links and short comments.
Any comments and ideas are welcome.