Writing to file with user as owner

Hello A quick question here: is it possible to have your script write to file with the user's as owner and not as 'nobody' or 'www' as owner (which is what it usually does). For example in perl one can use cgiwrap to write to file as the user to whom the script belongs. Any way of doing this in php? Any advice will be greatly appreciated. Anton Stroganov webmaster www.artwithin.com