Running sudo command as _www user

I have a web interface on a Mac Server for Final Cut Server that basically uses php's exec command to run some of FCS's command line tools and return results. The site basically sends a variable to a bash script on my computer, which in turn runs the correct script, so it's fairly secure and limited in what it can do.

I want to run a command that requires the sudo command. I have this password protected, so I'm not worried about security there either.

The problem is that the script's user is _www, and so I can't seem to run sudo. How do I make this possible? Thanks.