correct PHP headers for pdf file download

To download a PDF file in PHP, you will need to use the appropriate HTTP headers. Here's an example of how you can send the necessary headers to download a PDF file:

<?php

// Set the appropriate headers
header("Content-Type: application/pdf");
header("Content-Disposition: attachment; filename=document.pdf");

// Read the file content and output it
readfile("document.pdf");

This will send the appropriate HTTP headers to the browser, which will trigger the download of the PDF file.

Note: Make sure that the file path specified in the readfile function is correct and that the file exists on the server.