system/helpers/security_helper.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.2.4 or newer
 *
 * NOTICE OF LICENSE
 *
 * Licensed under the Open Software License version 3.0
 *
 * This source file is subject to the Open Software License (OSL 3.0) that is
 * bundled with this package in the files license.txt / license.rst.  It is
 * also available through the world wide web at this URL:
 * http://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to obtain it
 * through the world wide web, please send an email to
 * licensing@ellislab.com so we can send you a copy immediately.
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

/**
 * CodeIgniter Security Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/security_helper.html
 */

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

/**
 * XSS Filtering
 *
 * @param	string
 * @param	bool	whether or not the content is an image file
 * @return	string
 */
if ( ! function_exists('xss_clean'))
{
	function xss_clean($str, $is_image = FALSE)
	{
		$CI =& get_instance();
		return $CI->security->xss_clean($str, $is_image);
	}
}

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

/**
 * Sanitize Filename
 *
 * @param	string
 * @return	string
 */
if ( ! function_exists('sanitize_filename'))
{
	function sanitize_filename($filename)
	{
		$CI =& get_instance();
		return $CI->security->sanitize_filename($filename);
	}
}

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

/**
 * Hash encode a string
 *
 * @param	string
 * @return	string
 */
if ( ! function_exists('do_hash'))
{
	function do_hash($str, $type = 'sha1')
	{
		if ( ! in_array($type, hash_algos()))
		{
			$type = 'md5';
		}

		return hash($type, $str);
	}
}

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

/**
 * Strip Image Tags
 *
 * @param	string
 * @return	string
 */
if ( ! function_exists('strip_image_tags'))
{
	function strip_image_tags($str)
	{
		return preg_replace(array('#<img\s+.*?src\s*=\s*["\'](.+?)["\'].*?\>#', '#<img\s+.*?src\s*=\s*(.+?).*?\>#'), '\\1', $str);
	}
}

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

/**
 * Convert PHP tags to entities
 *
 * @param	string
 * @return	string
 */
if ( ! function_exists('encode_php_tags'))
{
	function encode_php_tags($str)
	{
		return str_replace(array('<?php', '<?PHP', '<?', '?>'),  array('&lt;?php', '&lt;?PHP', '&lt;?', '?&gt;'), $str);
	}
}

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