(PHP 4, PHP 5)
chgrp — Changes file group
Attempts to change the group of the file filename to group .
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.
Path to the file.
A group name or number.
如果成功則回傳 TRUE,失敗則回傳 FALSE。