Getting the subDirectory of root folder and download it

INDEX.Php

<?php
$mydir = "../var/export";
if ($handle = opendir($mydir)) {
    while (false !== ($file = readdir($handle))) {
        if ($file != '.' && $file != '..') {
?>
           <a href="download.php?f=<?php echo $file ?>" target="_blank"><?php echo $file ?></a><br/>
<?php
        }
    }
    closedir($handle);
}
?>


Download.php----

<?php $filename = $_GET['f'];
// set this to the path where your zipped files are located
$filepath = "../var/export/" . $filename;
// a little security


if (file_exists($filepath)){
    // make sure the browser knows what it's getting, and what to do with it
     header('Cache-Control: public');
    header('Content-Type: application/zip');
    header('Content-Disposition: attachment; filename=' . $filename);
    readfile($filepath);
    die();
} else {
    die('Error: File not found.');
}
?>