C:/xampp/htdocs/moodle/admin/tool/xmldb/actions/view_xml/view_xml.class.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/>.

class view_xml extends XMLDBAction {

    function init() {
        parent::init();
        // Set own core attributes
        $this->can_subaction = ACTION_NONE;
        //$this->can_subaction = ACTION_HAVE_SUBACTIONS;

        // Set own custom attributes
        $this->sesskey_protected = false; // This action doesn't need sesskey protection

        // Get needed strings
        $this->loadStrings(array(
            // 'key' => 'module',
        ));
    }

    function invoke() {
        parent::invoke();

        $result = true;

        // Set own core attributes
        $this->does_generate = ACTION_GENERATE_XML;

        // These are always here
        global $CFG, $XMLDB;

        // Do the job, setting result as needed

        // Get the file parameter
        $file = required_param('file', PARAM_PATH);
        $file = $CFG->dirroot . $file;
        // File must be under $CFG->wwwroot and
        // under one db directory (simple protection)
        if (substr($file, 0, strlen($CFG->dirroot)) == $CFG->dirroot &&
            substr(dirname($file), -2, 2) == 'db') {
            // Everything is ok. Load the file to memory
            $this->output = file_get_contents($file);
        } else {
            // Switch to HTML and error
            $this->does_generate = ACTION_GENERATE_HTML;
            $this->errormsg = 'File not viewable (' . $file .')';
            $result = false;
        }

        // Return ok if arrived here
        return $result;
    }
}