(PHP 4, PHP 5)
posix_getgroups — Return the group set of the current process
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);
?>
上例的输出类似于：
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
)