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Readfile issue PHP
if(file_exists($file_url)){header('Content-Type: '.$ftype);
header('Content-Transfer-Encoding: binary');
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header("Content-Length: " . filesize($dir.$fname));
header("Content-disposition: attachment; filename="".$fname.""");
ob_clean();
flush();
readfile($dir.$fname);
exit;}

$filename = $dir.$fname;
$filesize = filesize($filename);

    $chunksize = 4096;
    if($filesize > $chunksize)
    {
        $srcStream = fopen($filename, 'rb');
        $dstStream = fopen('php://output', 'wb');

        $offset = 0;
        while(!feof($srcStream)) {
            $offset += stream_copy_to_stream($srcStream, $dstStream, $chunksize, $offset);
        }

        fclose($dstStream);
        fclose($srcStream);
    }
    else
    {
        // stream_copy_to_stream behaves() strange when filesize > chunksize.
        // Seems to never hit the EOF.
        // On the other handside file_get_contents() is not scalable.
        // Therefore we only use file_get_contents() on small files.
        echo file_get_contents($filename);
    }

session_name("download_".$filename);
session_cache_limiter("public");
session_start();
header ("Content-Disposition: attachment; filename=".$filename."nn");
header ("Content-Type: application/octet-stream");
@readfile($link); // Path to file

function readfile_chunked($filename,$retbytes=true) {
   $chunksize = 1*(1024*1024); // how many bytes per chunk
   $buffer = '';
   $cnt =0;
   // $handle = fopen($filename, 'rb');
   $handle = fopen($filename, 'rb');
   if ($handle === false) {
       return false;
   }
   while (!feof($handle)) {
       $buffer = fread($handle, $chunksize);
       echo $buffer;
       ob_flush();
       flush();
       if ($retbytes) {
           $cnt += strlen($buffer);
       }
   }
       $status = fclose($handle);
   if ($retbytes && $status) {
       return $cnt; // return num. bytes delivered like readfile() does.
   }
   return $status;
}
header('Content-Type: '.$ftype);
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header("Content-Length: " . filesize($dir.$fname));
header("Content-disposition: attachment; filename="".$fname.""");
readfile_chunked($filen);