php backup zip current folder

gistfile1.txt

<pre>
  <?php
  $path = realpath(__DIR__);
  echo "<p>Zipping...</p>";
  $zip = new ZipArchive();
  $zip->open(dirname(__FILE__).'.zip', ZipArchive::CREATE | ZipArchive::OVERWRITE);
  $files = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path));
  foreach ($files as $name => $file) {
    if ($file->isDir()) {
      echo $name . "\r\n";
      flush();
      continue;
    } 
    $filePath = $file->getRealPath();
    $relativePath = substr($filePath, strlen($path) + 1);
    $zip->addFile($filePath, $relativePath);
  }
  if ($zip->close()) {
    echo "Done\r\n";
  } else {
    echo "Error\r\n";
  }
  ?>
</pre>