( string filename, mixed group )
Attempts to change the group of the file filename
to group (specified by name or number). Only the
superuser may change the group of a file arbitrarily; other users may
change the group of a file to any group of which that user is a member.
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 chown() and