google_forms/system/helpers/xml_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 XML Helpers
 *
 * @package     CodeIgniter
 * @subpackage  Helpers
 * @category    Helpers
 * @author      EllisLab Dev Team
 * @link        https://codeigniter.com/userguide3/helpers/xml_helper.html
 */

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

if (! function_exists('xml_convert')) {
    /**
     * Convert Reserved XML characters to Entities
     *
     * @param   string
     * @param   bool
     * @return  string
     */
    function xml_convert($str, $protect_all = false)
    {
        $temp = '__TEMP_AMPERSANDS__';

        // Replace entities to temporary markers so that
        // ampersands won't get messed up
        $str = preg_replace('/&#(\d+);/', $temp . '\\1;', $str);

        if ($protect_all === true) {
            $str = preg_replace('/&(\w+);/', $temp . '\\1;', $str);
        }

        $str = str_replace(
            array('&', '<', '>', '"', "'", '-'),
            array('&amp;', '&lt;', '&gt;', '&quot;', '&apos;', '&#45;'),
            $str
        );

        // Decode the temp markers back to entities
        $str = preg_replace('/' . $temp . '(\d+);/', '&#\\1;', $str);

        if ($protect_all === true) {
            return preg_replace('/' . $temp . '(\w+);/', '&\\1;', $str);
        }

        return $str;
    }
}