Sending information in a php page to perl and back

Hi, I am new to PHP but not Perl, and I can't find any information on this in the archives, or documentation. I have a perl script which does some processing for me, and I don't want to rewrite what it does in php, but all the other perl from a web site I am working on is in php. What I need to do is to execute a perl script with arguments (from the command line it is like: perlscript.pl question answer question1 answer1) and the perl script returns a positive or negative response with a single argument. So the user submits an html form to a php page, which does a number of things, but needs to send some arguments to the perl script, then process the response for the user. I have the perl script as a perl mod as well if this is useful (the perl script just calls the perl mod anyway). Thanks for your time, Jeni