google_forms/system/helpers/directory_helper.php

<?php

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package CodeIgniter
 * @author  EllisLab Dev Team
 * @copyright   Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright   Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @copyright   Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @license https://opensource.org/licenses/MIT MIT License
 * @link    https://codeigniter.com
 * @since   Version 1.0.0
 * @filesource
 */

defined('BASEPATH') or exit('No direct script access allowed');

/**
 * CodeIgniter Directory Helpers
 *
 * @package     CodeIgniter
 * @subpackage  Helpers
 * @category    Helpers
 * @author      EllisLab Dev Team
 * @link        https://codeigniter.com/userguide3/helpers/directory_helper.html
 */

// ------------------------------------------------------------------------

if (! function_exists('directory_map')) {
    /**
     * Create a Directory Map
     *
     * Reads the specified directory and builds an array
     * representation of it. Sub-folders contained with the
     * directory will be mapped as well.
     *
     * @param   string  $source_dir     Path to source
     * @param   int $directory_depth    Depth of directories to traverse
     *                      (0 = fully recursive, 1 = current dir, etc)
     * @param   bool    $hidden         Whether to show hidden files
     * @return  array
     */
    function directory_map($source_dir, $directory_depth = 0, $hidden = false)
    {
        if ($fp = @opendir($source_dir)) {
            $filedata   = array();
            $new_depth  = $directory_depth - 1;
            $source_dir = rtrim($source_dir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;

            while (false !== ($file = readdir($fp))) {
                // Remove '.', '..', and hidden files [optional]
                if ($file === '.' or $file === '..' or ($hidden === false && $file[0] === '.')) {
                    continue;
                }

                is_dir($source_dir . $file) && $file .= DIRECTORY_SEPARATOR;

                if (($directory_depth < 1 or $new_depth > 0) && is_dir($source_dir . $file)) {
                    $filedata[$file] = directory_map($source_dir . $file, $new_depth, $hidden);
                } else {
                    $filedata[] = $file;
                }
            }

            closedir($fp);
            return $filedata;
        }

        return false;
    }
}