Ubuntu :: Make A Startup Script That Executes A Simple Php Script At Boot?

trying to make a startup script that executes a simple php script at boot. The stipulation is that it must be run after fstab is processed because it requires access to a volume that fstab mounts. As it is, it doesn't seem to be running properly at startup, and I suspect that it is simply running before the volume is mounted. The script does not need root access. If I run it once I login, it works fine.

Also, is there a way to determine the output of a startup script?I am have configured a bash script called module.sh that cd's to the scripts directory (in the external volume) and then executes the script. I didn't forget the ampersand after the php invocation. I used update-rc.d module.sh defaults to configure it.