C:/xampp/htdocs/moodle/login/change_password_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 login_change_password_form extends moodleform {

    function definition() {
        global $USER, $CFG;

        $mform = $this->_form;

        $mform->addElement('header', '', get_string('changepassword'), '');

        // visible elements
        $mform->addElement('static', 'username', get_string('username'), $USER->username);

        if (!empty($CFG->passwordpolicy)){
            $mform->addElement('static', 'passwordpolicyinfo', '', print_password_policy());
        }
        $mform->addElement('password', 'password', get_string('oldpassword'));
        $mform->addRule('password', get_string('required'), 'required', null, 'client');
        $mform->setType('password', PARAM_RAW);

        $mform->addElement('password', 'newpassword1', get_string('newpassword'));
        $mform->addRule('newpassword1', get_string('required'), 'required', null, 'client');
        $mform->setType('newpassword1', PARAM_RAW);

        $mform->addElement('password', 'newpassword2', get_string('newpassword').' ('.get_String('again').')');
        $mform->addRule('newpassword2', get_string('required'), 'required', null, 'client');
        $mform->setType('newpassword2', PARAM_RAW);


        // hidden optional params
        $mform->addElement('hidden', 'id', 0);
        $mform->setType('id', PARAM_INT);

        // buttons
        if (get_user_preferences('auth_forcepasswordchange')) {
            $this->add_action_buttons(false);
        } else {
            $this->add_action_buttons(true);
        }
    }

    function validation($data, $files) {
        global $USER;
        $errors = parent::validation($data, $files);

        update_login_count();

        // ignore submitted username
        if (!$user = authenticate_user_login($USER->username, $data['password'])) {
            $errors['password'] = get_string('invalidlogin');
            return $errors;
        }

        reset_login_count();

        if ($data['newpassword1'] <> $data['newpassword2']) {
            $errors['newpassword1'] = get_string('passwordsdiffer');
            $errors['newpassword2'] = get_string('passwordsdiffer');
            return $errors;
        }

        if ($data['password'] == $data['newpassword1']){
            $errors['newpassword1'] = get_string('mustchangepassword');
            $errors['newpassword2'] = get_string('mustchangepassword');
            return $errors;
        }

        $errmsg = '';//prevents eclipse warnings
        if (!check_password_policy($data['newpassword1'], $errmsg)) {
            $errors['newpassword1'] = $errmsg;
            $errors['newpassword2'] = $errmsg;
            return $errors;
        }

        return $errors;
    }
}