Hey doomhz,
If your comfortable setting up your Zend Framework app to work from
the command line you could use <a href="
http://nodejs.org/docs/v0.4.6/
api/child_processes.html#child_process.exec">child_process.exec()</a>
to pass input from Node app to your Zend Framework app. With that
setup your Node app continues humming along until the PHP app responds
by outputting data back to the command line. If you pass data back and
forth with JSON its pretty seem-less on both sides.
Another option would be to use a queuing system like <a href="https://
github.com/chrisboulton/php-resque">PHP-Rescue</a>. You could add jobs
directly to Redis from your NodeJS app and have the PHP-Resque jobs
talk to your Zend Framework app.
Hope that helps. Let us know how it goes.