Commands which call exec() or shell_exec() ??

Hi -- -

Strange problem. One of my applications was just moved to a new server. The
new server has php configured to blacklist some functions (using
"disable_functions="). One of the "banned" functions is exec().

The error log is reporting "shell_exec() has been disabled for security
reasons"  --- but exec() or shell_exec() are not in my code *anywhere*. The
program and line number being reported makes absolutely no sense.

Are there other php commands that really call exec() or shell_exec() ???
Any clues how this could happen? Fixes (other than un-blacklisting the
command, of course)?

Many thanks,

Ken