Edit: xml_helper.php

Editing: xml_helper.php

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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

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

/**
 * CodeIgniter XML Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/xml_helper.html
 */

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

/**
 * Convert Reserved XML characters to Entities
 *
 * @access	public
 * @param	string
 * @return	string
 */
if ( ! function_exists('xml_convert'))
{
	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)
		{
			$str = preg_replace("/$temp(\w+);/","&\\1;", $str);
		}

return $str;
	}
}

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

/* End of file xml_helper.php */
/* Location: ./system/helpers/xml_helper.php */