/system/helpers/xml_helper.php CI XML助手

<?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
 * CI XML助手
 * 
 * @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
 * 保留的XML字符转换到实体
 * 
 * @access	public
 * @param	string
 * @return	string
 */
if ( ! function_exists('xml_convert'))
{
	function xml_convert($str, $protect_all = FALSE)
	{
		$temp = '__TEMP_AMPERSANDS__'; //__TEMP_AMPERSANDS__

		// Replace entities to temporary markers so that
		// ampersands won't get messed up
		// 临时标记，所以取代实体＆符号将不会被搞砸了
		
		//如果是以&#然后为数字的，用$temp\\1;来替换
		
		$str = preg_replace("/&#(\d+);/", "$temp\\1;", $str);

		
		//如果$protect_all为true那么&开头的也会被替换哦
		if ($protect_all === TRUE)
		{
			$str = preg_replace("/&(\w+);/",  "$temp\\1;", $str);
		}

		$str = str_replace(array("&","<",">","\"", "'", "-"),
							array("&", "<", ">", """, "'", "-"),
							$str);

		// Decode the temp markers back to entities
		// 解码临时标记的实体
		//上面替换了，但下面为何又转回去了
		$str = preg_replace("/$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 */