download

<?php
if(isset($_GET['FileName']))
{
$fullPath = $MainDirectory.$_GET['FileName'];
 if ($fd = fopen ($fullPath, "r")) {
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);

    if(isset($path_parts["extension"]))
    {
    $ext = strtolower($path_parts["extension"]);
    }
    else
    {
    $ext="";
    }

    switch ($ext) {
        case "pdf":
        $mime_type ="application/pdf";
         break;

         case "txt":
        $mime_type ="force-download";
         break;

       default:
        $mime_type="application/force-download";
       break;
    }
     header("Content-type: ".$mime_type);
        header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\"");
        header("Content-Transfer-Encoding: binary");
        header("Accept-Ranges: bytes");

    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);

 }
?>