redhat, php, and exec

[Kyle Waters]

    I have a php script which uses exec.  When I run it from the command
line as the apache user it works.  when I try to run it through the web
server it doesn't.  No errors or anything not even in the logs.  I'm
using rhel 4 and php 4.3.9

Can anyone tell me what's wrong or how to debug this?

Kyle