(PHP 4 >= 4.0.2, PHP 5, PHP 7)
posix_setegid — Set the effective GID of the current process
posix_setegid ( int $gid ) : bool
Set the effective 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.
gid
The group id.
Returns true on success or false on failure.
Example #1 posix_setegid() example
This example will print out the effective group id, once changed.
<?php echo 'My real group id is '.posix_getgid(); //20 posix_setegid(40); echo 'My real group id is '.posix_getgid(); //20 echo 'My effective group id is '.posix_getegid(); //40 ?>
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https://www.php.net/manual/en/function.posix-setegid.php