From MODx Wiki

Overview

Returns the physical path from the supplied virtual path.

This function has been removed from the API as of version 0.9.6.2 RC2.

Use the contstants instead:

MODX_BASE_PATH

MODX_BASE_URL

MODX_SITE_URL

MODX_MANAGER_PATH

MODX_MANAGER_URL

Source Code

File:	manager/includes/document.parser.class.inc.php
Line:	1910

function mapPath($path, $filename= "") {
        if (!$path)
            $path= ".";
        if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
            // only on windows?
            $absPath= str_replace("\\", "/", realpath($path));
            return $absPath . ($absPath && $filename ? "/$filename" : "$filename");
        } else {
            // determine base path
            if (substr($path, 0, 1) == "/")
                $basePath= $_SERVER['DOCUMENT_ROOT'];
            else
                $basePath= dirname($_SERVER['SCRIPT_FILENAME']);
            // return absolute path
            $absPath= realpath("$basePath/$path");
            return $absPath . ($absPath && $filename ? "/$filename" : "$filename");
        }
    }