PHP：强制PDF文件下载

Question

i am trying to download a . pdf file on button submit, following is my code

if(mail('myemail@gmail.com', 'Brochure Downloaded ', $string)){ 
            $text= 'Your message recieved, We will contact you shrtly '; 
            $file_url = 'http://www.website.com/brochure.pdf'; 
                header('Content-Type: application/octet-stream');
                header("Content-Transfer-Encoding: Binary"); 
                header("Content-disposition: attachment; filename=\"" . basename($file_url) . "\""); 
                readfile($file_url); // do the double-download-dance (dirty but worky)
    }

Now whats happening is that email is sent but files is not downloaded, instead page gets reloading and long characters are printed on the screen ,

Need your help with this please

this is what i get

Answer 1

I have changed headers a little bit. I think the proper content type is application/pdf andsome of headers are not necessery.

if(mail('myemail@gmail.com', 'Brochure Downloaded ', $string)){ 
  $text= 'Your message recieved, We will contact you shrtly '; 
  $file_url = 'http://www.website.com/brochure.pdf'; 
  header("Content-type:application/pdf");
  header("Content-Disposition:attachment;filename='" . basename($file_url) . "'");
  readfile($file_url); // do the double-download-dance (dirty but worky)
}

You may also add the content length:

header('Content-Length: ' . filesize($file_url));

Answer 2

check this code, first you need to add content type if you download any type file as like if you want to download image then header('Content-Type: image/png'); if pdf then header("Content-Type: application/pdf"); etc

<?php
if (mail('myemail@gmail.com', 'Brochure Downloaded ', $string)) {
$text = 'Your message recieved, We will contact you shrtly ';
$file_url = 'http://www.website.com/brochure.pdf';
header("Content-Description: File Transfer");
header("Content-Disposition: attachment; filename=$file_url");
header("Content-Type: application/pdf");
header("Content-Transfer-Encoding: binary");
readfile($file);
}
?>

you may use

header('Content-Length: ' . filesize($file_url));

you should use Content-Length if you want someone download a file with another header