purge.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/>.

/**
 * @package    enrol_attributes
 * @author     Nicolas Dunand <Nicolas.Dunand@unil.ch>
 * @copyright  2012-2015 Université de Lausanne (@link http://www.unil.ch}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define('AJAX_SCRIPT', true);

require_once(dirname(__FILE__, 3) . '/config.php');
require_once('lib.php');

require_sesskey();

$courseid = required_param('courseid', PARAM_INT);
$instanceid = required_param('instanceid', PARAM_INT);

$course = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
$context = context_course::instance($course->id);

require_login($course);
require_capability('enrol/attributes:config', $context);

if (enrol_attributes_plugin::purge_instance($instanceid)) {
    echo json_encode(get_string('ajax-okpurged', 'enrol_attributes'));
}
else {
    echo json_encode(get_string('ajax-error', 'enrol_attributes'));
}