PHP Membuka .pdf

<?php
include "konmysqli.php";

$id_tugas_akhir=$_GET["id"];
$sql="select `dokumentasi` from `$tbtugasakhir` where `id_tugas_akhir`='$id_tugas_akhir'";
$d=getField($conn,$sql);
$dokumentasi=$d["dokumentasi"];


$filename = "ypathfile/".$dokumentasi ;
header ('Content-type:application/pdf');
header ('Content-Disposition:inline; filename="$filename"');
header ('Content-Transfer-Encoding: binart');
header ('Accept-Ranges: bytes');
@readfile ($filename);



function getField($conn,$sql){
    $rs=$conn->query($sql);
    $rs->data_seek(0);
    $d= $rs->fetch_assoc();
    $rs->free();
    return $d;
}
?>