title: Zend_File_Transfer: Rename file after upload
body: <p>I'm trying to rename the uploaded file with the rename-addFilter. The actual upload already works, but the files are just uploaded and not renamed, so how can I do this? 
  Here's my Controller-Code, that uploads the file:</p>
  
  <pre><code>        //Getting the new filename, works perfectly:
          $name = explode('.', $form['pic']);
          $ext = $name[1];
          $mapper = new Application_Model_CmsMap();
          $row = $mapper-&gt;fetchRow('childId = "' . $id . '" AND type= "pic"');
          $new_filename = $row-&gt;name.'.'.$ext;
  
          //All images will and are be stored in /public/images/
          //Maybe the picture should be replaced, so it should be overwrited, in case it already exists
          $upload-&gt;addFilter('Rename', array(
              'target' =&gt; '/images/'.$new_filename,
              'overwrite' =&gt; true,
              )
          );
  
          $upload-&gt;receive();
  </code></pre>