The below code fails on the line: $dbh->func( 'users', 'CSV', 'users.csv' 'ad_catalog');

What is the error or warning message you get?

Update oh never mind, I just spotted it (although in the future please always show the error message rather than just saying "it failed"). The problem here is that you don't have a comma between 'users.csv' and 'ad_catalog'. If you copied that from the docs and the docs look like that, please let me know where so I can fix it :-).