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Extra code after html tag causes error message

Thread began 10/05/2009 4:34 pm by Roxana | Last modified 10/06/2009 1:50 pm by Roxana | 1188 views | 4 replies


Extra code after html tag causes error message

I am sorry, if this is a duplicate post. I thought I posted it, but I couldn't find it.

I had the problem, that after the final step of the checkout process the cart was not emptied. Jason sent me this code to add after the html tag:
// Initialize the session.
// If you are using session_name("something"), don't forget it now!

// Unset all of the session variables.
$_SESSION = array();

// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (isset($_COOKIE[session_name()])) {
setcookie(session_name(), '', time()-42000, '/');

// Finally, destroy the session.

Now the cart is empty after the success page is displayed, but there appears an error message on the success page:
Warning: Cannot modify header information - headers already sent by (output started at /var/www/html/ in /var/www/html/ on line 305

Line 305 of the success page is: setcookie(session_name(), '', time()-42000, '/');
This is part of the code that I added after the html tag.

Despite the error message everything works. How do I get rid of that error message?

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