pack to gz and return archive file download

<?php
  function pack_to_gz($file) {
    $zip = new ZipArchive;
    $filename = $file . ".gz";
    //$zip->open($filename, ZipArchive::CREATE);
    //$zip->addFile($file);
    //$zip->close();
    //header('Content-Type: application/zip');
    //header('Content-disposition: attachment; filename=' . $filename);
    //header('Content-Length: ' . filesize($filename));
    //readfile($filename);
    //return $filename;
  }
  
  pack_to_gz('/Users/danghong/Desktop/d-hong.com.zip');
?>