(PHP 4, PHP 5, PHP 7)
chgrp — Changes file group
chgrp ( string $filename , mixed $group ) : bool
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.
filename
Path to the file.
group
A group name or number.
Returns true on success or false on failure.
Example #1 Changing a file's group
<?php
$filename = 'shared_file.txt';
$format = "%s's Group ID @ %s: %d\n";
printf($format, $filename, date('r'), filegroup($filename));
chgrp($filename, 8);
clearstatcache(); // do not cache filegroup() results
printf($format, $filename, date('r'), filegroup($filename));
?> Note: This function will not work on remote files as the file to be examined must be accessible via the server's filesystem.
Note: On Windows, this function fails silently when applied on a regular file.
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https://www.php.net/manual/en/function.chgrp.php