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.
Returns TRUE on success or FALSE on failure.
Note: This function will not work on
remote files as the file to
be examined must be accessible via the servers filesystem.
Note: When safe mode is enabled, PHP checks whether
the files or directories you are about to operate on have the same UID (owner) as the
script that is being executed.