PHP Manual: chown
chown
Description
bool chown ( string filename, mixed user )
Attempts to change the owner of the file filename
to user user
. Only the superuser may change the
owner of a file.
Notes
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.