// Get the base URL for this and related pages into a convenient variable.
$baseurl = new moodle_url('/admin/roles/define.php', array('action' => $action, 'roleid' => $roleid));
$manageurl = new moodle_url('/admin/roles/manage.php');
if ($return === 'manage') {
$returnurl = $manageurl;
} else {
$returnurl = new moodle_url('/admin/roles/define.php', array('action' => 'view', 'roleid' => $roleid));
}
// Check access permissions.
$systemcontext = context_system::instance();
require_login();
require_capability('moodle/role:manage', $systemcontext);
admin_externalpage_setup('defineroles', '', array('action' => $action, 'roleid' => $roleid), new moodle_url('/admin/roles/define.php'));
// Export role.
if ($action === 'export') {
core_role_preset::send_export_xml($roleid);
die;
}
// Handle the toggle advanced mode button.
$showadvanced = get_user_preferences('definerole_showadvanced', false);
if (optional_param('toggleadvanced', false, PARAM_BOOL)) {
$showadvanced = !$showadvanced;
set_user_preference('definerole_showadvanced', $showadvanced);
}
// Get some basic data we are going to need.
$roles = get_all_roles();
$rolenames = role_fix_names($roles, $systemcontext, ROLENAME_ORIGINAL);
$rolescount = count($roles);
if ($action === 'add') {
$title = get_string('addinganewrole', 'core_role');
} else {
