C:/xampp/htdocs/moodle/question/export_form.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();

require_once($CFG->libdir . '/formslib.php');


class question_export_form extends moodleform {

    protected function definition() {
        $mform = $this->_form;

        $defaultcategory = $this->_customdata['defaultcategory'];
        $contexts = $this->_customdata['contexts'];

        // Choice of format, with help.
        $mform->addElement('header', 'fileformat', get_string('fileformat', 'question'));
        $fileformatnames = get_import_export_formats('export');
        $radioarray = array();
        $i = 0 ;
        foreach ($fileformatnames as $shortname => $fileformatname) {
            $currentgrp1 = array();
            $currentgrp1[] = $mform->createElement('radio', 'format', '', $fileformatname, $shortname);
            $mform->addGroup($currentgrp1, "formathelp[$i]", '&#160;', array('<br />'), false);

            if (get_string_manager()->string_exists('pluginname_help', 'qformat_' . $shortname)) {
                $mform->addHelpButton("formathelp[$i]", 'pluginname', 'qformat_' . $shortname);
            }

            $i++ ;
        }
        $mform->addRule("formathelp[0]", null, 'required', null, 'client');

        // Export options.
        $mform->addElement('header', 'general', get_string('general', 'form'));

        $mform->addElement('questioncategory', 'category', get_string('exportcategory', 'question'), compact('contexts'));
        $mform->setDefault('category', $defaultcategory);
        $mform->addHelpButton('category', 'exportcategory', 'question');

        $categorygroup = array();
        $categorygroup[] = $mform->createElement('checkbox', 'cattofile', '', get_string('tofilecategory', 'question'));
        $categorygroup[] = $mform->createElement('checkbox', 'contexttofile', '', get_string('tofilecontext', 'question'));
        $mform->addGroup($categorygroup, 'categorygroup', '', '', false);
        $mform->disabledIf('categorygroup', 'cattofile', 'notchecked');
        $mform->setDefault('cattofile', 1);
        $mform->setDefault('contexttofile', 1);

        // Set a template for the format select elements
        $renderer = $mform->defaultRenderer();
        $template = "{help} {element}\n";
        $renderer->setGroupElementTemplate($template, 'format');

        // Submit buttons.
        $this->add_action_buttons(false, get_string('exportquestions', 'question'));
    }
}