A oauth nonce check utilizing Mongo

nonce.php

<?php
$closure = function(){
    $mongo = new MongoDB(new Mongo(), 'ibp_oauth');
     return (bool) $mongo->selectCollection('nonce')->findOne(
        array(
            'consumer_key' => '988e5a4582374786de12f5254b4b12b6',
            'access_key' => '4bcf3f8a517e39c65f74883b4b0e5b78',
            'timestamp' => 1329412801
        )
    );
};
var_dump($closure());