how to echo and filedownload together in php - php

Question

The following code is mine.
I want to download a file and echo together in Php. But echo in end of code doesn't work, how to fixed this code?
$filename = trim($conf['savedir']).$_GET['task'].".".$_GET['hash'].".xml";
$downname = $_GET['task'].'.'.$_GET['hash'].'.xml';
$fp = fopen($filename, 'r');
if($fp == null)
{
echo "Wrong Access1";
} else {
header('Content-type:text/xml charset=utf-8');
header('Content-disposition: attachment; filename='.$downname);
header('Content-length:'.filesize($filename));
header('Content-transfer-encoding: binary');
header('Pragma: no-cache');
header('Expires: 0');
fpassthru($filename);
fclose($fp);
echo $_GET['task'].'.'.$_GET['hash'].'.xml file download.';
}

Answer 1

Like #Mark Backer said, you can't echo and download at the same time for the same request, but there are some "tricks" to echo something and download the file.
Let's suppose that your code from the question is located into test.php file and the user requests the file that contains the code bellow:
<script type="text/javascript">
window.open('test.php?task=<?=$_GET['task']?>&hash=<?=$_GET['hash']?>', '_blank');
</script>
<?php
echo $_GET['task'].'.'.$_GET['hash'].'.xml file download.';
So, the javascript code will pass the $_GET variables to test.php open a new window for download and in echo your message in the current window.