(PHP 4, PHP 5, PHP 7)
posix_setgid — Set the GID of the current process
posix_setgid ( int $gid ) : bool
Set the real group ID of the current process. This is a privileged function and needs appropriate privileges (usually root) on the system to be able to perform this function. The appropriate order of function calls is posix_setgid() first, posix_setuid() last.
Note:
If the caller is a super user, this will also set the effective group id.
gid
The group id.
Returns true on success or false on failure.
Example #1 posix_setgid() example
This example will print out the effective group id, once it is changed.
<?php echo 'My real group id is '.posix_getgid(); //20 posix_setgid(40); echo 'My real group id is '.posix_getgid(); //40 echo 'My effective group id is '.posix_getegid(); //40 ?>
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https://www.php.net/manual/en/function.posix-setgid.php