PHP SCRIPT FOR PDF FILE DOWNLOADING ?

(1) write code for  "download.php" file:

<?php

ignore_user_abort(true);
set_time_limit(0);

// disable the time limit for this script

$path = "../proudct_images/";

// change the path to fit your websites document structure
$dl_file = preg_replace("([^\w\s\d\-_~,;:\[\]\(\].]|[\.]{2,})", '', $_GET['download_file']);
// simple file name validation
$dl_file = filter_var($dl_file, FILTER_SANITIZE_URL);
// Remove (more) invalid characters
$fullPath = $path.$dl_file;

if ($fd = fopen ($fullPath, "r")) {
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);
    switch ($ext) {
        case "pdf":
        header("Content-type: application/pdf");
        header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\"");
// use 'attachment' to force a file download
        break;
        // add more headers for other content types here
        default;
        header("Content-type: application/octet-stream");
        header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
        break;
    }
    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;


?>

(2)then write code for   giving link for downloading  file name as  

"downloadfile.html" :


<a href="proudct_images/download1.php?download_file='some_file.pdf'">Download file</a>




Note:  Create a folder name  product_images  &

 keep   your   pdf    file 

& 

 download.php  file into product_images  "folder".