C:/xampp/htdocs/moodle/mod/workshop/toolbox.php

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<?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/>.

require_once(dirname(dirname(dirname(__FILE__))).'/config.php');
require_once(dirname(__FILE__).'/locallib.php');

$id         = required_param('id', PARAM_INT); // course_module ID
$tool       = required_param('tool', PARAM_ALPHA);

$cm         = get_coursemodule_from_id('workshop', $id, 0, false, MUST_EXIST);
$course     = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
$workshop   = $DB->get_record('workshop', array('id' => $cm->instance), '*', MUST_EXIST);

require_login($course, false, $cm);
$workshop = new workshop($workshop, $cm, $course);
require_sesskey();

switch ($tool) {
case 'clearaggregatedgrades':
    require_capability('mod/workshop:overridegrades', $workshop->context);
    $workshop->log('update clear aggregated grades');
    $workshop->clear_submission_grades();
    $workshop->clear_grading_grades();
    break;

case 'clearassessments':
    require_capability('mod/workshop:overridegrades', $workshop->context);
    $workshop->log('update clear assessments');
    $workshop->clear_assessments();
    break;
}

redirect($workshop->view_url());