Process Zip Winscp

<?php

set_include_path(get_include_path() . PATH_SEPARATOR . './phpseclib0.3.0');

include("Net/SFTP.php");

$sftp = new Net_SFTP('172.17.30.12');

if (!$sftp->login('gis_kf', '@kerinci123')) 

{

    die("Cannot connect");

}

$path = "/GIS/UAV/Multicopter/$_GET[bu]/$_GET[sector]/$_GET[estate]/$_GET[featno]/$_GET[rotation]/00/Elevation/Contour";

$list = $sftp->nlist($path);

if ($list === false)

{

    die("Error listing directory ".$path);

}

$prefix = "Contour.zip";

$matches = preg_grep("/^$prefix.*/i", $list);

if (count($matches) != 1)

{

    die("No file or more than one file matches the pattern: ".implode(",", $matches));

}

$matches = array_values($matches);

$filename = $matches[0];

$filepath = $path."/".$filename;

if (!$sftp->get($filepath, $filename))

{

    die("Error downloading file ".$filepath);

}

  $f="Contour.zip";   

       $file = ("$f");

       $filetype=filetype($file);

       $filename=basename($file);

       header ("Content-Type: ".$filetype);

       header ("Content-Length: ".filesize($file));

       header ("Content-Disposition: attachment; filename=".$filename);

       readfile($file);

   unlink("$f"); 

 echo "<script language='javascript'> alert ('Download Completed '); document.location='https://webgis.fiber.biz.id/webgis/index?search=gis%map%display&elevation_contour=1&estate=$_GET[sector]'; </script>";

?>