settings.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

defined('MOODLE_INTERNAL') || die;

if ($ADMIN->fulltree) {
    $options = array(0=>get_string('no'), 1=>get_string('yes'));
    $str = get_string('configallowfullanonymous', 'individualfeedback');
    $settings->add(new admin_setting_configselect('individualfeedback_allowfullanonymous',
                                    get_string('allowfullanonymous', 'individualfeedback'),
                                    $str, 0, $options));
}