问如何使用Zend Framework压缩3个小文本文件并强制下载

EN

$zip = new ZipArchive();
if($zip->open($filename, ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE) !== true){
    throw new Exception('Could not create zip file ' . $filename);
    die('zip fail');
}else{
    $zip->addFile($file1Uri, 'file1.txt');
    $zip->addFile($file2Uri, 'file2.txt');
}

$zip->close();

if(file_exists($filename)){
    return true;            
}else{
    throw new Exception('Could not create zip file ' . $filename);
}

protected function _deliver($file, $name, $extension, $size, $mime){
    header('Pragma: private');
    header("Expires: -1");
    header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT'); 
    header("Cache-Control: no-cache");
    header("Content-Transfer-Encoding: binary");
    header("Content-Type: " . $mime);
    header("Content-Description: File Transfer"); 
    header('Content-Disposition: attachment; filename="' . $name . '.' . $extension . '"');
    header("Content-Length: " . $size);
    set_time_limit(0);        
    if(!readfile($file)){
        return false;
    }
}