gistfile1.php

<?php
$choices = [
    'Permission 1' => 'Permission 1',
    'Permission 1 Sub-Permissions' => [
	'Permission 1a' => '1a',
	'Permission 1b' => '1b'
    ],
    'Permission 2' => 'Permission 2',
    'Permission 3' => 'Permission 3',
    'Permission 3 Sub-Permissions' => [
	'Permission 3a' => '3a',
	'Permission 3b' => '3b'
    ]
];