PHP / GPG

Hi! I've installed gnupg-1.2.1 I can execute the 'gpg' command shown below in console mode, both as 'root' or 'httpd'. My webserver runs as 'httpd'. I have a PHP file running the same 'gpg' command and ... it does not work! To be sure, I ran another command ('who') through PHP, writing to same directory as 'gpg', and this one worked! I'm at a loss here. Any idea what I am doing wrong? // Command = /usr/bin/who > /home/tmp/pgp-who Result Code = 0 // Command = /usr/local/bin/gpg -a --recipient 'Ici Londres' --encrypt -o /home/tmp/pgpadvert.asc /home/tmp/pgpadvert Result Code = 2 // TIA Lao Toma