C:/xampp/htdocs/moodle/question/category_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_category_edit_form extends moodleform {

    protected function definition() {
        global $CFG, $DB;
        $mform    = $this->_form;

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

        $mform->addElement('header', 'categoryheader', get_string('addcategory', 'question'));

        $questioncategoryel = $mform->addElement('questioncategory', 'parent', get_string('parentcategory', 'question'),
                    array('contexts'=>$contexts, 'top'=>true, 'currentcat'=>$currentcat, 'nochildrenof'=>$currentcat));
        $mform->setType('parent', PARAM_SEQUENCE);
        if (question_is_only_toplevel_category_in_context($currentcat)) {
            $mform->hardFreeze('parent');
        }
        $mform->addHelpButton('parent', 'parentcategory', 'question');

        $mform->addElement('text', 'name', get_string('name'),'maxlength="254" size="50"');
        $mform->setDefault('name', '');
        $mform->addRule('name', get_string('categorynamecantbeblank', 'question'), 'required', null, 'client');
        $mform->setType('name', PARAM_MULTILANG);

        $mform->addElement('textarea', 'info', get_string('categoryinfo', 'question'), array('rows'=> '10', 'cols'=>'45'));
        $mform->setDefault('info', '');
        $mform->setType('info', PARAM_MULTILANG);

        $this->add_action_buttons(false, get_string('addcategory', 'question'));

        $mform->addElement('hidden', 'id', 0);
        $mform->setType('id', PARAM_INT);
    }
}