CascadiaPHP 2024


(PHP 4, PHP 5, PHP 7, PHP 8)

chgrpChanges file group


chgrp(string $filename, string|int $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.



Path to the file.


A group name or number.

Return Values

Returns true on success or false on failure.


Example #1 Changing a file's group

= '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.

See Also

add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top