C:/xampp/htdocs/moodle/mod/quiz/report/default.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();


abstract class quiz_default_report {
    const NO_GROUPS_ALLOWED = -2;

    public abstract function display($cm, $course, $quiz);

    public function print_header_and_tabs($cm, $course, $quiz, $reportmode = 'overview') {
        global $PAGE, $OUTPUT;

        // Print the page header
        $PAGE->set_title(format_string($quiz->name));
        $PAGE->set_heading($course->fullname);
        echo $OUTPUT->header();
    }

    public function get_current_group($cm, $course, $context) {
        $groupmode = groups_get_activity_groupmode($cm, $course);
        $currentgroup = groups_get_activity_group($cm, true);

        if ($groupmode == SEPARATEGROUPS && !$currentgroup && !has_capability('moodle/site:accessallgroups', $context)) {
            $currentgroup = self::NO_GROUPS_ALLOWED;
        }

        return $currentgroup;
    }
}