PHP chgrp Function: Change File Group Ownership
The article explains PHP’s chgrp function, which changes a file’s group ownership, outlines its syntax, required parameters, permission restrictions, return values, and provides a complete PHP example demonstrating how to modify a file’s group and display the result.
chgrp changes the group ownership of a file. It attempts to set the group of $filename to $group (specified by name or numeric ID). Only the superuser can change any file’s group; other users may only set the group to one they belong to.
Signature: bool chgrp(string $filename, mixed $group) Parameters:
filename : Path to the file.
group : Group name or numeric ID.
Return value: Returns TRUE on success, or FALSE on failure.
Example:
<?php
$filename = 'shared_file.txt';
$format = "%s's Group ID @ %s: %d
";
printf($format, $filename, date('r'), filegroup($filename));
chgrp($filename, 8);
clearstatcache();
// do not cache filegroup() results
printf($format, $filename, date('r'), filegroup($filename));
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