在php中的浏览器中显示多个文件PDF

<?php
    $dirname = "pdf/";// Directory path
    $file = glob($dirname."*pdf");
        
foreach($file as $string){
    //header("Pragma: public", true);
    header("Expires: 0"); // set expiration time
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Content-Type: application/force-download");
    header("Content-Type: application/octet-stream");
    header("Content-Type: application/download");
    header("Content-Disposition: inline; filename=".basename($string));
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".filesize($string));
    die(file_get_contents($string));
        }
?>