Renaming files after a name in a db field possible?

Hi there, I am wondering if this is possible in php: I have a whole bunch of files named after countrycodes. E.g. CA-map.gif Now I would like to rename those files after the country. This is listed in a dbtable containing the countrycode and countryname. E.g. CA - Canada How could I generate a php script which scannes the dir for matching Countrycode patterns and renames the filename ? E.g.: Make out of CA-map.gif -> canada-map.gif? Thanx for any hint, andy