Warning: Cannot add header information - headers already sent

From: Phyzlo (phyzlo_at_yahoo.com)
Date: 03/08/04 

Date: 8 Mar 2004 11:16:53 -0800

Hello,

I've recently started learning PHP and have a question.
I tried running below script which can be found at
http://se2.php.net/manual/sv/function.setcookie.php

but I keep getting this message on my browser, why?

Warning: Cannot add header information - headers already sent by
(output started at /var/www/cookietest.php:2) in
/var/www/cookietest.php on line 6

Warning: Cannot add header information - headers already sent by
(output started at /var/www/cookietest.php:2) in
/var/www/cookietest.php on line 7

Warning: Cannot add header information - headers already sent by
(output started at /var/www/cookietest.php:2) in
/var/www/cookietest.php on line 8

-----

<?
echo "Setting cookie";

$value = 'Test value';

setcookie("TestCookie", $value);
setcookie("TestCookie", $value, time()+3600); /* expire in 1 hour */
setcookie("TestCookie", $value, time()+3600, "/~rasmus/",
".example.com", 1);

echo "Cookie Set!";
?>

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