C:/xampp/htdocs/moodle/admin/tool/xmldb/actions/get_db_directories/get_db_directories.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 get_db_directories 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
        $this->does_generate = ACTION_NONE;
        //$this->does_generate = ACTION_GENERATE_HTML;

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

        // Do the job, setting $result as needed

        // Lets go to add all the db directories available inside Moodle
        // Create the array if it doesn't exists
        if (!isset($XMLDB->dbdirs)) {
            $XMLDB->dbdirs = array();
        }

        // get list of all dirs and create objects with status
        $db_directories = get_db_directories();
        foreach ($db_directories as $path) {
            $dbdir = new stdClass;
            $dbdir->path = $path;
            if (!isset($XMLDB->dbdirs[$dbdir->path])) {
                $XMLDB->dbdirs[$dbdir->path] = $dbdir;
             }
            $XMLDB->dbdirs[$dbdir->path]->path_exists = file_exists($dbdir->path);  //Update status
         }

        // Sort by key
        ksort($XMLDB->dbdirs);

        // Return ok if arrived here
        return true;
    }
}