setcookie, Cannot modify header information - headers already sent
- by Nano HE
Hi,I am new to PHP, I practised PHP setcookie() just now and failed.
http://localhost/test/index.php
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title></title>
    </head>
    <body>
     <?php
     $value = 'something from somewhere';
     setcookie("TestCookie", $value);
     ?>
    </body>
</html>
http://localhost/test/view.php
<?php
 // I plan to view the cookie value via view.php
 echo $_COOKIE["TestCookie"];
?>
But I failed to run index.php, IE warning like this.
Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\test\index.php:9) in C:\xampp\htdocs\test\index.php on line 12
I enabled my IE 6 cookie no doubt. 
Is there anything wrong on my procedure above? Thank you.
WinXP OS and XAMPP 1.7.3 used.