(PHP 4, PHP 5, PHP 7)
posix_getgroups — Return the group set of the current process
posix_getgroups ( ) : array
Gets the group set of the current process.
Returns an array of integers containing the numeric group ids of the group set of the current process.
Example #1 Example use of posix_getgroups()
<?php $groups = posix_getgroups(); print_r($groups); ?>
The above example will output something similar to:
Array
(
    [0] => 4
    [1] => 20
    [2] => 24
    [3] => 25
    [4] => 29
    [5] => 30
    [6] => 33
    [7] => 44
    [8] => 46
    [9] => 104
    [10] => 109
    [11] => 110
    [12] => 1000
)
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    https://www.php.net/manual/en/function.posix-getgroups.php