Zend Framework upload file rename

//Instantial file special class
$fName=$this->_request->getPost('fName');
$adapter = new Zend_File_Transfer_Adapter_Http();
//Folder to store uploaded files
$adapter->setDestination('/opt/lampp/htdocs/blog/upload');
//Upload configuration
$adapter
->addValidator ( 'Extension', false, $configs['extension']) //File format restrictions
->addValidator('Size', false, array('min' =>floatval($configs['minsize']),
 'max' => floatval($configs['maxsize '])))//Set the size of the uploaded file between 1-2M
->addValidator ( 'Count', false, array('min' => intval($configs['mincount']),
 'max' => intval($configs['maxcount'])) );//Number of uploaded files
//Rename configuration
$fileInfo = $adapter->getFileInfo();//Get basic configuration
$ extName=$this->getExtension($fileInfo);//Get the extension
$filename=md5(time()+$fileInfo['fFile']['name']).'.'.$extName;/ /Rename
$adapter->addFilter('Rename', array('target' => $filename, 'overwrite' => true)); //Perform rename

//Return to appear after uploading Message
if (!$adapter->receive())
{
 $messages = $adapter->getMessages ();//Detection
 //Zend_Debug::dump($messages);
 $message='' ;
 if(is_array($messages))
 {
 foreach($messages as $k=>$v)
 {
 $message.=$k.':'.$v.'';
 }
 }
 else
 {
 $message=$messages;
 }
}
else
{
 $this->view->message='Upload successful! ';
}

/**
 * Get file extension
 * @param String $name file noun
 * @author
*/
public function getExtension ($name)
{
 $fname='';
 if($name)
 {
 foreach ($name as $val)
 {
 $ fname=$val['name'];
 }
 $exts = @split("[/\.]", $fname) ;
 $n = count($exts)-1;
 $exts = $exts[ $n];
 return $exts;
 }
}