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chgrp
Changes file group
(PHP 4, PHP 5)
bool chgrp ( string filename, mixed 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.
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.