Fix warning: Headers already sent - setcookie error in PHP

After some modifications on my website, I am receiveing error notification:

Warning: Cannot modify header information - headers already sent by (output started at /www/b/i/u50034/public_html/index.php:965) in /www/b/i/u50034/public_html/index.php on line 1006

I found out that error is caused by setcookie(). In code, everything seems to be correct. Do you know how to fix it and make it work properly ?

posted on 12.07.2019 at 18:51

onefive

Hi,

To fix the error, the setcoookie() function has to be moved before HTML content.

The description of setcookie() function:
Setcookie() defines a cookie to be sent along with the rest of the HTTP headers. Like other headers, cookies must be sent before any output from your script (this is a protocol restriction).

So instead of something like this:

<?php

$cookie_name = "abc";
$cookie_value = "12345";

?>

<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>

<?php

setcookie($cookie_name, $cookie_value, time() + 3600, "/");

?>

</body>
</html>

You have to use this:

<?php

$cookie_name = "abc";
$cookie_value = "12345";

setcookie($cookie_name, $cookie_value, time() + 3600, "/");

?>

<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>

</body>
</html>

posted on 21.07.2019 at 10:15

Tim