C:/xampp/htdocs/moodle/admin/tool/xmldb/actions/load_xml_files/load_xml_files.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 load_xml_files 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

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

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

        $result = true;

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

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

        // Do the job, setting $result as needed

        // Iterate over $XMLDB->dbdirs, loading their XML data to memory
        if ($XMLDB->dbdirs) {
            $dbdirs =& $XMLDB->dbdirs;
            foreach ($dbdirs as $dbdir) {
                // Set some defaults
                $dbdir->xml_exists = false;
                $dbdir->xml_writeable = false;
                $dbdir->xml_loaded  = false;
                // Only if the directory exists
                if (!$dbdir->path_exists) {
                    continue;
                }
                $xmldb_file = new xmldb_file($dbdir->path . '/install.xml');
                // Set dbdir as necessary
                if ($xmldb_file->fileExists()) {
                    $dbdir->xml_exists = true;
                }
                if ($xmldb_file->fileWriteable()) {
                    $dbdir->xml_writeable = true;
                }
                // Load the XML contents to structure
                $loaded = $xmldb_file->loadXMLStructure();
                if ($loaded && $xmldb_file->isLoaded()) {
                    $dbdir->xml_loaded = true;
                }
                $dbdir->xml_file = $xmldb_file;
            }
        }
        return $result;
    }
}