C:/xampp/htdocs/moodle/mod/quiz/report/statistics/lib.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/>.

defined('MOODLE_INTERNAL') || die();


function quiz_statistics_questiontext_preview_pluginfile($context, $questionid, $args, $forcedownload) {
    global $CFG;
    require_once($CFG->dirroot . '/mod/quiz/locallib.php');

    list($context, $course, $cm) = get_context_info_array($context->id);
    require_login($course, false, $cm);

    // Assume only trusted people can see this report. There is no real way to
    // validate questionid, becuase of the complexity of random quetsions.
    require_capability('quiz/statistics:view', $context);

    question_send_questiontext_file($questionid, $args, $forcedownload);
}

function quiz_statistics_cron() {
    global $DB;

    $expiretime = time() - 5*HOURSECS;
    $todelete = $DB->get_records_select_menu('quiz_statistics',
            'timemodified < ?', array($expiretime), '', 'id, 1');

    if (!$todelete) {
        return true;
    }

    list($todeletesql, $todeleteparams) = $DB->get_in_or_equal(array_keys($todelete));

    $DB->delete_records_select('quiz_question_statistics',
            'quizstatisticsid ' . $todeletesql, $todeleteparams);

    $DB->delete_records_select('quiz_question_response_stats',
            'quizstatisticsid ' . $todeletesql, $todeleteparams);

    $DB->delete_records_select('quiz_statistics',
            'id ' . $todeletesql, $todeleteparams);

    return true;
}