[Jim]

The script should run if the permissions are set to 644. Also if you see a file called .htaccess in the directory that that php script is in, or a higher directory if that php file is in a subdirectory and it is showing any file size to it, try renaming it to something else (.htaccess1 will work) that will effectively eliminate that as the cause.

There is also a real time error log in cpanel, refreshing both pages (php script, and the error log page in cPanel) will yield a clue.

Also if you have shell access try running the script at the command line:
#php wehave.php

P.S. I'm just writing this for future searches. I have enough info to go do all of that myself in this case.