C:/xampp/htdocs/moodle/admin/tool/qeupgradehelper/resetquiz.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(__FILE__) . '/../../../config.php');
require_once(dirname(__FILE__) . '/locallib.php');
require_once(dirname(__FILE__) . '/afterupgradelib.php');
require_once($CFG->libdir . '/adminlib.php');

$quizid = required_param('quizid', PARAM_INT);
$confirmed = optional_param('confirmed', false, PARAM_BOOL);

require_login();
require_capability('moodle/site:config', get_context_instance(CONTEXT_SYSTEM));
tool_qeupgradehelper_require_upgraded();

admin_externalpage_setup('qeupgradehelper', '', array(),
        tool_qeupgradehelper_url('resetquiz', array('quizid' => $quizid)));
$PAGE->navbar->add(get_string('listupgraded', 'tool_qeupgradehelper'),
        tool_qeupgradehelper_url('listtodo'));
$PAGE->navbar->add(get_string('resetquiz', 'tool_qeupgradehelper'));

$renderer = $PAGE->get_renderer('tool_qeupgradehelper');

$quizsummary = tool_qeupgradehelper_get_resettable_quiz($quizid);
if (!$quizsummary) {
    print_error('invalidquizid', 'tool_qeupgradehelper',
            tool_qeupgradehelper_url('listupgraded'));
}

$quizsummary->name = format_string($quizsummary->name);

if ($confirmed && data_submitted() && confirm_sesskey()) {
    // Actually do the conversion.
    echo $renderer->header();
    echo $renderer->heading(get_string(
            'resettingquizattempts', 'tool_qeupgradehelper', $quizsummary));

    $upgrader = new tool_qeupgradehelper_attempt_upgrader(
            $quizsummary->id, $quizsummary->resettableattempts);
    $upgrader->reset_all_resettable_attempts();

    echo $renderer->heading(get_string('resetcomplete', 'tool_qeupgradehelper'));
    echo $renderer->end_of_page_link(tool_qeupgradehelper_url('listupgraded'),
            get_string('listupgraded', 'tool_qeupgradehelper'));

    echo $renderer->footer();
    exit;
}

echo $renderer->reset_quiz_are_you_sure($quizsummary);