[stefanglase]

Looking at the bottom of your wp-config.php file in the WordPress root directory will let you find something like this:

if ( !defined('ABSPATH') )
    define('ABSPATH', dirname(__FILE__) . '/');

For an example file have a look here:
http://core.trac.wordpress.org/browser/trunk/wp-config-sample.php

You can make use of this constant called ABSPATH in other places of your WordPress scripts and in most cases it should point to your WordPress root directory.

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