Description
bool 
chown ( string filename, mixed user )
     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.
     See also chmod().