Wordpress - Error: headers already sent

Question

I have a form on my site that I have included in a sidebar on the page. Basically what it does is collects some data, and if that data has been correctly filled in, it passes it on to a larger form on another page.

The problem is, I keep getting the 'headers already sent' error when it gets submitted. The weird thing is, the form works fine on my development server.

Basically my code looks like this;

    <?php
    if($_SERVER['REQUEST_METHOD'] == 'POST'){

        // Checks for errors are here (omitted for brevity)

        if(!$errors){
            header('Location:'.bloginfo('url').'?page_id=xxx');
        }
    }
    ?>

Bearing in mind that I have to check for errors, is there another way that I can redirect to another page on the site without using header()?

Have you read [this](http://stackoverflow.com/a/8028987/1401975) ? — HamZa, Mar 21 '13 at 12:02
Thanks Darma, this would work but I need the value of $_POST so that I can populate the destination form. — mrbubbles, Mar 21 '13 at 12:21
@glitchmunki : It's possible, see how to do it in my answer below. — darma, Mar 21 '13 at 12:40

score 2 · Answer 1 · edited May 23 '17 at 12:21

2

Any function that sends or modifies HTTP headers must be invoked prior to any output otherwise as you've seen it will fail.

There is a good post/explanation on this at the below link. How to fix "Headers already sent" error in PHP

edited May 23 '17 at 12:21

Community

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1

answered Mar 21 '13 at 12:16

llanato

2,508
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Thanks Atallon. I understand that header() has to be used before any other output now. So would the solution be to make my check for $errors in the header, and then redirect from there? – mrbubbles Mar 21 '13 at 12:19
If you can add in the check on $errors before any code is output then it should solve your issue. – llanato Mar 21 '13 at 12:47

score 2 · Answer 2 · answered Mar 21 '13 at 12:39

2

No problem, you can use the key/values from $_POST to generate the redirect :

<?php
if($_SERVER['REQUEST_METHOD'] == 'POST'){

    // Checks for errors are here (omitted for brevity)

    if(!$errors){
        $xxx = 'valueofxxxhere';
        echo '<script>document.location="'.bloginfo('url').'?page_id='.$xxx.'";</script>';
        die();
    }
}
?>

Not my design by choice (always better to redirect from the headers) but sometimes useful.

answered Mar 21 '13 at 12:39

darma

4,687
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Thanks for the answer Darma, although like you I would prefer to do it using header(), so I'm going to try and do it in the header before any output. – mrbubbles Mar 21 '13 at 12:46

Wordpress - Error: headers already sent

2 Answers2