check if Modx Revo user logged in
function checkRevoManager ()
{
require_once 'config.core.php';
require_once MODX_CORE_PATH . 'model/modx/modx.class.php';
$modx = new modX();
$modx->initialize('web');
if (!$modx->user->hasSessionContext('mgr'))
die('Access denied.');
}