<?php

/* SQL connection */
$pdo = new PDO(/* SQL connection parameters */);

/* RBAC class */
$rbac = new RBAC($pdo);

/* Read the role id from the request string (you should also sanitize it) */
$role_id = $_REQUEST['role_id'];

/* Array with a list of possible role permission IDs. This list can be created in different ways, either statically (from a configuration file, for example) or dynamically from a database */
$permission_list = array('1', '2', '3', /* ... */);

/* Now, for each permission we look for the checkbox value */
foreach ($permission_list as $permission)
{
    /* Check if a request string exists */
    if (array_key_exists('checkbox_' . $permission, $_REQUEST))
    {
        /* Check its value: if is 1 set the permission, otherwise remove it */
        $permission_set = $_REQUEST['checkbox_' . $permission];

        if ($permission_set == '1')
        {
            $rbac->addRolePermission($role_id, $permission);
        }
        else
        {
            $rbac->deleteRolePermission($role_id, $permission);
        }
    }
}