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system/helpers/path_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 Path Helpers
+ *
+ * @package		CodeIgniter
+ * @subpackage	Helpers
+ * @category	Helpers
+ * @author		ExpressionEngine Dev Team
+ * @link		http://codeigniter.com/user_guide/helpers/xml_helper.html
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Set Realpath
+ *
+ * @access	public
+ * @param	string
+ * @param	bool	checks to see if the path exists
+ * @return	string
+ */
+if ( ! function_exists('set_realpath'))
+{
+	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", $path))
+		{
+			show_error('The path you submitted must be a local server path, not a URL');
+		}
+
+		// Resolve the path
+		if (function_exists('realpath') AND @realpath($path) !== FALSE)
+		{
+			$path = realpath($path).'/';
+		}
+
+		// Add a trailing slash
+		$path = preg_replace("#([^/])/*$#", "\\1/", $path);
+
+		// Make sure the path exists
+		if ($check_existance == TRUE)
+		{
+			if ( ! is_dir($path))
+			{
+				show_error('Not a valid path: '.$path);
+			}
+		}
+
+		return $path;
+	}
+}
+
+
+/* End of file path_helper.php */
+/* Location: ./system/helpers/path_helper.php */