title: Output not generated by zend_service_amazon
body: <p>I am using Zend Framework to retrieve book information from amazon. This code is not showing any error in the page neither displaying any results. Can you solve this?</p>
  
  <pre><code>define("AMAZON_API_KEY","#################");
  define("AMAZON_SECRET_KEY","############################################");
  require_once 'Zend/Service/Amazon.php';
  $amazon = new Zend_Service_Amazon(AMAZON_API_KEY, 'US', AMAZON_SECRET_KEY);
  $results = $amazon-&gt;itemSearch(array('SearchIndex' =&gt; 'Books','Keywords' =&gt; 'history'));
  print_r($results);
  foreach ($results as $result) {
      echo $result-&gt;Title . '&lt;br /&gt;';
  }
  </code></pre>
  
  <p>Thanks in advance.
  Prakash</p>