(PHP 4, PHP 5)
posix_getgid — Return the real group ID of the current process
Return the numeric real group ID of the current process.
Returns the real group id, as an integer.
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
?>