Forcing page download in PHP [duplicate]

This question already has answers here: How to force file download with PHP (12 answ开发者_如何学运维ers) Closed last year.

How do I force the browser to download the current page browsed to? A page with the header Content-type: text/plain for example using PHP?

If a user navigates to that page, a download box should appear (the browser download dialog with the usual "Save As".

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Straight from http://php.net/header

<?php
    // There is contention over if this MIME type is right, but just use it for now.
    header('Content-type: text/javascript');

    header('Content-Disposition: attachment; filename="file.js"');

    readfile('file.js'); // Echo the file
?>

NOTE: this must be done before any other output (and can be about the only thing on the page, unless you want other output in your file).