Snippet for MODx Revolution. Displays the desired field from the resource.

getResourceField.php

<?php
if (!isset($id) || !isset($field)) return;

$resource = $modx->getObject('modResource', $id);
if (!$resource) return;

$data = $resource->toArray();

if (isset($data[$field])) {
    return $data[$field];
} else {
    return false;
}