How to download PDF file using WordPress codex

<?php
/* Template Name: PDF */
?>
<?php
// place this code inside a php file and call it f.e. "download.php"
$uploads = wp_upload_dir();
$ppp = explode('/', $uploads[path]);
$path = "/".$ppp[1]."/".$ppp[2]."/".$ppp[3]."/".$ppp[4]."/".$ppp[5]."/".$ppp[6]."/09/";
//$path = $uploads['path']."/"; // change the path to fit your websites document structure
$fullPath = $path.$_GET['download_file'].".pdf";
if ($fd = fopen ($fullPath, "r")) {
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);
    switch ($ext) {
        case "pdf":
        header("Content-type: application/pdf"); // add here more headers for diff. extensions
        header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\""); // use 'attachment' to force a download
        break;
        default;
        header("Content-type: application/octet-stream");
        header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
    }
    header("Content-length: $fsize");
    header("Cache-control: private"); //use this to open files directly
    while(!feof($fd)) {
        $buffer = fread($fd, 2048);
        echo $buffer;
    }
}
fclose ($fd);
exit;
// example: place this kind of link into the document where the file download is offered:
// <a href="download.php?download_file=some_file.pdf">Download here</a>
?>
<a href="pdf?download_fileq=<?php echo $filed_name[0]; ?>" ><img src="<?php bloginfo('template_directory') ?>/images/pdf.jpg" /><span class="pdf">Download the <?php echo $filed_name[0]; ?></span></a>

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