PHP - Function chgrp()

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The chgrp() function can be used to change file group.

Syntax

bool chgrp ( string filename, mixed group )

The above function attempts to change the group of the file: filename to the group. Only the superuser may change the group of a file arbitrarily, and other users may change the group of a file to any group of which that user is a member. This function can return TRUE on success or FALSE on failure.

Example

<?php
   $filename = "/PhpProject/sample.txt";
   $format = "%s's Group ID @ %s: %d\n";
   printf($format, $filename, date('r'), filegroup($filename));
   chgrp($filename, "admin");
   clearstatcache();  // do not cache filegroup() results
   printf($format, $filename, date('r'), filegroup($filename));
?>

Output

/PhpProject/sample.txt's Group ID @ Fri, 22 May 2020 07:42:21 +0200: 0
/PhpProject/sample.txt's Group ID @ Fri, 22 May 2020 07:42:21 +0200: 0