Downalod any file with php

<?php
///Downalod any file with php


function downloadFile($filename)
    {
        header("Content-disposition: filename=".$filename."");

        header("Content-type: application/octetstream");
       
        header("Pragma: no-cache");
       
        header("Expires: 0");
       
    }
   
    $filename='test.doc';
    downloadFile($filename);
   
    ?>