PHP

view a pdf file in the browser using the php header function

$file = 'headerPdfFile.pdf';

$filename = 'IamPdfFile.pdf';
  
// Header content type
header('Content-type: application/pdf');
  
header('Content-Disposition: inline; filename="' . $filename . '"');  
  
// Read the file
@readfile($file);

php header pdf

<?php
header("Pragma: public");
    header("Expires: 0");
    header("Accept-Ranges: bytes");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Content-Type: application/pdf");
    header("Content-Disposition: attachment; filename=order.pdf");
    header("Content-Transfer-Encoding: binary");