Changing PHP error reporting in only one directory?

[WannaFly]

By default my php install is set to report not errors to the HTML output, which is what I want because it is a production server. I'd like to be able to test scripts in a different directory though and have it show the errors in the HTML output - is there anything i can add to .htaccess to do this?

Please dont get on the "you shouldn't be testing on a production server" topic

Thanks for any help!