shell whoami doesn't equal php shell_exec whoami?

Question

In a shell I do simple whoami and I get geoff, which is good, since that\'s who I am.

In a php file I have shell_exec(\'whoami\'); and I get nobody.

This see

Answer 1

1. add "2>&1" to your command
2. specify the full path to shell_exec(nobody has no $PAHT, so it just don't know where imagemagic binary is stored.
3. try to run the script as user on the console to see that is going wrong.