C:/xampp/htdocs/moodle/lib/dtl/xml_database_exporter.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 xml_database_exporter extends database_exporter {
    protected abstract function output($text);

    public function begin_database_export($version, $release, $timestamp, $description) {
        $this->output('<?xml version="1.0" encoding="utf-8"?>');
        //TODO add xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" and schema information
        $this->output('<moodle_database version="'.$version.'" release="'.$release.'" timestamp="'.$timestamp.'"'.(empty ($description) ? '' : ' comment="'.htmlspecialchars($description, ENT_QUOTES).'"').'>');
    }

    public function begin_table_export(xmldb_table $table) {
        $this->output('<table name="'.$table->getName().'" schemaHash="'.$table->getHash().'">');
    }

    public function finish_table_export(xmldb_table $table) {
        $this->output('</table>');
    }

    public function finish_database_export() {
        $this->output('</moodle_database>');
    }

    public function export_table_data(xmldb_table $table, $data) {
        $this->output('<record>');
        foreach ($data as $key => $value) {
            if (is_null($value)) {
                $this->output('<field name="'.$key.'" value="null" />');
            } else {
                $this->output('<field name="'.$key.'">'.htmlspecialchars($value, ENT_NOQUOTES).'</field>');
            }
        }
        $this->output('</record>');
    }
}