title: When querying Amazon services with Zend (Zend_Service_Amazon), how to sort results by date?
body: <p>I have begun using Zend with PHP to run product searches against Amazon. However, I can't figure out how to sort the products by date -- since I want to find the most recent products which match my keywords. <a href="http://docs.amazonwebservices.com/AWSEcommerceService/2005-10-05/ApiReference/ItemSearchOperation.html" rel="nofollow">The Amazon documentation</a> doesn't have much information on how to sort results. Here's my code:</p>
  
  <pre><code>$amazon = new Zend_Service_Amazon('AMAZON_API_KEY', 'US', 'AMAZON_SECRET_KEY');
  $results = $amazon-&gt;itemSearch(array('SearchIndex' =&gt; 'Books',
                                       'Keywords' =&gt; 'Cooking'
  ));
  foreach ($results as $result) {
      echo $result-&gt;Title . '&lt;br /&gt;';
  }
  </code></pre>