设置/删除通过php中的标题显示的pdf中的默认标题

Question

I have a pdf file

i am displaying pdf like this

header('Content-type: application/pdf');          
header('Content-Disposition: inline;  filename="' . $pdf . '"');
header('Content-Transfer-Encoding: binary');
echo file_get_contents($pdf);

but in title of page i am getting a last part of url

if url is http://example.com/some title of browser will be some

can i change that title or remove it?

NB:I dont want to use iframe