C:/xampp/htdocs/moodle/admin/tool/xmldb/actions/unload_xml_file/unload_xml_file.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 unload_xml_file extends XMLDBAction {

    function init() {
        parent::init();

        // 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_NONE;

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

        // Do the job, setting result as needed

        // Get the dir containing the file
        $dirpath = required_param('dir', PARAM_PATH);
        $dirpath = $CFG->dirroot . $dirpath;

        // Get the original dir and delete some elements
        if (!empty($XMLDB->dbdirs)) {
            if (isset($XMLDB->dbdirs[$dirpath])) {
                $dbdir =& $XMLDB->dbdirs[$dirpath];
                if ($dbdir) {
                    unset($dbdir->xml_file);
                    unset($dbdir->xml_loaded);
                    unset($dbdir->xml_changed);
                    unset($dbdir->xml_exists);
                    unset($dbdir->xml_writeable);
                }
            }
        }
        // Get the edited dir and delete it completely
        if (!empty($XMLDB->editeddirs)) {
            if (isset($XMLDB->editeddirs[$dirpath])) {
                unset($XMLDB->editeddirs[$dirpath]);
            }
        }

        // Launch postaction if exists (leave this here!)
        if ($this->getPostAction() && $result) {
            return $this->launch($this->getPostAction());
        }

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