(PHP 4, PHP 5, PHP 7)
posix_getgid — Return the real group ID of the current process
posix_getgid ( ) : int
Return the numeric real group ID of the current process.
Returns the real group id, as an int.
Example #1 posix_getgid() example
This example will print out the real group id, even once the effective group id has been 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-getgid.php