system/helpers/path_helper.php

<?php
/**
 * 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 - 2013, 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
 */
defined('BASEPATH') OR exit('No direct script access allowed');

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

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

if ( ! function_exists('set_realpath'))
{
	/**
	 * Set Realpath
	 *
	 * @param	string
	 * @param	bool	checks to see if the path exists
	 * @return	string
	 */
	function set_realpath($path, $check_existance = FALSE)
	{
		// Security check to make sure the path is NOT a URL. No remote file inclusion!
		if (preg_match('#^(http:\/\/|https:\/\/|www\.|ftp|[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})#i', $path))
		{
			show_error('The path you submitted must be a local server path, not a URL');
		}

		// Resolve the path
		if (@realpath($path) !== FALSE)
		{
			$path = realpath($path);
		}
		elseif ($check_existance && ! is_dir($path) && ! is_file($path))
		{
			show_error('Not a valid path: '.$path);
		}

		// Add a trailing slash, if this is a directory
		return is_dir($path) ? rtrim($path, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR : $path;
	}
}

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