Get Headers of file

One day I wanted to get the last modification time of an image hosted on an external server , I searched in php and found that function

get_headers()

This a sample of using it

<?php
$headers = get_headers("http://www.megansteidl.com/images/stick_figure.gif" , 1);
echo "<pre>";
print_r($headers);
?>

This is the output

Array(
    [0] => HTTP/1.1 200 OK
    [Date] => Mon, 28 Jun 2010 17:00:50 GMT
    [Server] => Apache
    [Last-Modified] => Mon, 14 Jul 2008 22:29:43 GMT
    [ETag] => "931fa6-12a1-487bd357"
    [Accept-Ranges] => bytes
    [Content-Length] => 4769
    [Connection] => close
    [Content-Type] => image/gif
)

Hope you find it useful. 
Thanks,