exec problems

Hello, I need to write a script that will stuff the names of all the files in a directory into an array, which I can then use for some adminstrative processing. Seems easy enough: exec ("ls", $fileArray, $isComplete); This will run fine if I call the php file containing this code from bash (using the php cgi), but not if I use it inside a php file accessed via the web server. I'm running apache with suexec enabled on a Redhat Linux box. Looking in the error log revealed the following error: /ls: No such file or directory I thought it might have something to do with the absence of a path name, so I added the fully qualified path to the command string, but unfortunately, that didn't make any difference. Php version is 4.0.3pl1. Thanks for your help. jh