Can I turn off warnings in PHP5 on a per script basis?
 

Anyone know how to do this?

Warnings always give important information. Even notices sometimes too. However, to supress a warning for a specific function call, prepend the function name with @.

Hmm, but if you want turn it for completely in that single script, don't you just slot in:
error_reporting(0);
at the top of the file?

I tried the error_reporting just after <?php but it doesn't seem to be suppressing the warnings.