title: magento product collection with specific id
body: <p>i select products with </p>
  
  <pre><code>$products = Mage::getModel('catalog/product')-&gt;getCollection()-&gt;addAttributeToFilter('entity_id', array('in' =&gt; $productIds)); 
  </code></pre>
  
  <p>how can i archieve that the collection is in the same order as the ids in  $productIds?</p>
  
  <p>thanks</p>