Attempts to change the group of the symlink filename to group.
Only the superuser may change the group of a symlink arbitrarily; other users may change the group of a symlink to any group of which that user is a member.
Path to the symlink.
The group specified by name or number.
Returns true on success or false on failure.
This function will not work on remote files as the file to be examined must be accessible via the server's filesystem.
This function is not implemented on Windows platforms.