file - How to zip a whole directory and download using php -

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i self studying php , creating sample test site lets user input file code used determine file path of folder downloaded. code have below download single file. want download , zip whole directory. please help. thank in advance

    <h3>search client file</h3>             <form  method="post" action="#"  id="searchform">               type image code:<br><br>                   <input  type="text" name="icode">             <br>       <input  type="submit" name="submit" value="search">             </form>    <?php      $fcode=$_post["icode"];  if (!empty($fcode))    {  $file="/var/www/website/$fcode.tif";       if (file_exists($file))      {         header('content-description: file transfer');        header('content-type: application/octet-stream');        header('content-disposition: attachment; filename='.basename($file));        header('content-transfer-encoding: binary');        header('expires: 0');        header('cache-control: must-revalidate');        header('pragma: public');        header('content-length: ' . filesize($file));        ob_clean();        ob_end_flush();        readfile($file);        }        else       {         echo "the file $fcode.tif not exist";       }     }           else      {        echo "no values";      }      ?> 

<?php  $dir = 'dir'; $zip_file = 'file.zip';  // real path our folder $rootpath = realpath($dir);  // initialize archive object $zip = new ziparchive(); $zip->open($zip_file, ziparchive::create | ziparchive::overwrite);  // create recursive directory iterator /** @var splfileinfo[] $files */ $files = new recursiveiteratoriterator(     new recursivedirectoryiterator($rootpath),     recursiveiteratoriterator::leaves_only );  foreach ($files $name => $file) {     // skip directories (they added automatically)     if (!$file->isdir())     {         // real , relative path current file         $filepath = $file->getrealpath();         $relativepath = substr($filepath, strlen($rootpath) + 1);          // add current file archive         $zip->addfile($filepath, $relativepath);     } }  // zip archive created after closing object $zip->close();   header('content-description: file transfer'); header('content-type: application/octet-stream'); header('content-disposition: attachment; filename='.basename($zip_file)); header('content-transfer-encoding: binary'); header('expires: 0'); header('cache-control: must-revalidate'); header('pragma: public'); header('content-length: ' . filesize($zip_file)); readfile($zip_file);  ?> 

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how zip whole folder using php