Attempts to change the owner of the file filename to user user (specified by name or number). Only the superuser may change the owner of a file.
Palauttaa TRUE onnistuessaan, muutoin FALSE.
Huomaa: This function will not work on remote files as the file to be examined must be accessible via the servers filesystem.
Huomaa: Kun safe mode on k�yt�ss�, PHP tarkistaa onko k�sitelt�vien tiedostojen/hakemistojen UID sama kuin ajettavalla skriptill�.
See also chmod().