[PHP] Calling Perl from PHP -- Help --

[Matt Friedman]

I'm stumped. I've searched all over and can't figure this one out.

I have a perl script that waits for input on the command line. You type in a string 
and it returns a string.

I'd like to be able to this via php, since I can't rewrite the script in php, since 
it's a little over my head.

So, how do I open the perl script in php, send it some input and read the output?

Thanks,
Matt.