Unzip fichier ZIP aprés upload via ftp

  ///this is upload code
chdir('ftp');

    foreach (glob('*.*') as $filename) {
        $ftp_path = $ftp_path = $path.$filename;
      $upload=  ftp_put($ftp_conn,$ftp_path , $filename, FTP_BINARY);
    }

    // check upload status:


    if ($upload==true){

    //if uploaded i  unzip the file

     $zip = new ZipArchive;
    $res = $zip->open('/public_html/ftp.zip');
    if ($res === TRUE) {
      $zip->extractTo('/public_html/');
      $zip->close();
      echo 'done!';
    } else {
      echo 'error!';
    }
}