Gets a pagetitle of a specified resource

snippet.getpagetitle.php

<?php
$id = $modx->getOption('id',$scriptProperties,$modx->resource->get('id'));
$pageTitle = '';
$resource = $modx->getObject('modResource',$id);
if ($resource) {
    $pageTitle = $resource->get('pagetitle');
}
return $pageTitle;