setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?setPrefixedCookie-Can-t-set-cookie-headers-already-sent-80411 Mon, 16 Mar 2026 23:35:35 -0700 en-us setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2239165#post2239165 That is exactly what it was. Thanks! 

]]> Fri, 08 Jul 2016 17:28:57 -0700 forum-posts.php?postNum=2239165#post2239165 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2239159#post2239159 Hi wolf66, 

The issue related to content being loaded on the page before headers were being sent, this post has a description of the issue:

http://www.interactivetools.com/forum/forum-posts.php?postNum=2238265#post2238265

I'd suggest searching the page the issue is happening on and removing any white space before the viewer_functions.php file loads. 

If you can't resolve the issue, we can take a look if you raise a second level support request here:

http://www.interactivetools.com/support/email_support_form.php

Thanks,

Greg

]]> Fri, 08 Jul 2016 10:09:20 -0700 forum-posts.php?postNum=2239159#post2239159 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2239155#post2239155 Did you get a fix for this as I have the same issue at present trying to integrate the Membership plugin which I haven't used before. 

]]> Thu, 07 Jul 2016 20:23:01 -0700 forum-posts.php?postNum=2239155#post2239155 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238298#post2238298 Hi degreesnorth, 

I'll need to take a look at the sites codebase to be able to work out what the exact issue is, please could you fill out a second level support request:

https://www.interactivetools.com/support/email_support_form.php

Then I can take a closer look at the problem.

Cheers,

Greg

]]> Mon, 15 Feb 2016 09:27:13 -0800 forum-posts.php?postNum=2238298#post2238298 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238288#post2238288 Im in the office for another 30 mins if you want me to have a look - grab me on skype? tim at toledoh dot com dot au

]]> Thu, 11 Feb 2016 22:22:27 -0800 forum-posts.php?postNum=2238288#post2238288 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238287#post2238287 No, it's not that either.  It's coming up as the google analytics code which is incorrect.  If I delete that, then it moves to the header.  I honestly think something is conflicting with the code, rather than empty spaces.

????

]]> Thu, 11 Feb 2016 22:19:20 -0800 forum-posts.php?postNum=2238287#post2238287 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238286#post2238286 It looks like you may have empty lines in genetics_header.php?

]]> Thu, 11 Feb 2016 22:09:51 -0800 forum-posts.php?postNum=2238286#post2238286 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238285#post2238285 Hi Tim

Thanks for the suggestion.  Tried that but still the same error.  

It appears to have errors with the following, as if the cms code is conflicting with:

<?php include_once("analyticstracking.php") ?> and 

<?php include("genetics_header.php") ?>

Hmmm... does anyone have any suggestions?  Many thanks in advance.

]]> Thu, 11 Feb 2016 20:53:41 -0800 forum-posts.php?postNum=2238285#post2238285 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238284#post2238284 Check on line 92 to 94 and change:

?>

<!DOCTYPE html>

to

?><!DOCTYPE html>

That may help.

]]> Thu, 11 Feb 2016 20:21:03 -0800 forum-posts.php?postNum=2238284#post2238284 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238280#post2238280 Hi Greg

There is no space, and <?php header('Content-type: text/html; charset=utf-8'); ?> is the very first line.

I have attached the file - perhaps I am overlooking something else?

Thanks in advance.

]]> Thu, 11 Feb 2016 14:24:43 -0800 forum-posts.php?postNum=2238280#post2238280 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238265#post2238265 Hi Carole, 

This happens when the server tries to send a header after content has started loading on the page. As the content has started to appear, PHP can't set the page headers anymore. For example if you create a test page with the following content at the top of the document:

<?php
  header("Content-Type: text/html");
?>
<h1>Hello World</h1>

The code above would work, as the headers are sent before content starts loading, but if you had this instead:

<h1>Hello World</h1>
<?php
  header("Content-Type: text/html");
?>

You'd get the error:

setPrefixedCookie: Can't set cookie, headers already sent!

Because content has started to appear on the page, so page headers can't be set anymore. This issue also happens if any content at all starts to load, for example even a new would cause the issue:


<?php  header("Content-Type: text/html");?>

I'd recommend checking over conditions_detail.php and ensuring there is no html or blank spaces before the viewer_functions.php load on the page. I'd also check if any headers are set after the html is displayed.

Cheers,

Greg

]]> Thu, 11 Feb 2016 10:05:18 -0800 forum-posts.php?postNum=2238265#post2238265 setPrefixedCookie: Can't set cookie, headers already sent! https://interactivetools.com/forum/forum-posts.php?postNum=2238261#post2238261 Hi

I continue to get this issue (seems at random), on this page.  

http://www.geneticalliance.org.au/conditions_detail.php?Cardio-Facial-Cutaneous-Syndrome-93

It is actually a page which Interactive Tools developed for me, so not sure what/why it's happening.  It also continues on from a previous post http://www.interactivetools.com/forum/forum-posts.php?postNum=2236750#post2236750   where this was happening.

Could anyone shed some light on this?

Thankds

Carole

]]> Wed, 10 Feb 2016 20:47:02 -0800 forum-posts.php?postNum=2238261#post2238261