What is PHP?
PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.
Where can I find more information?
Official Site http://www.php.net
So what's the connection between PHP and cocoon?
The PHPGenerator has been deprecated however, since it didn't work properly, nobody was able to support it, and hardly anybody used it.
What may the future hold for PHP <--> Java interaction ?
JSR223 Scripting Pages in Java Web Applications