wp_redirect() – headers already sent

I am trying to use wp_redirect() to redirect the user after successfully submitting a signup form on the page.

It’s not working and shows the following error:

Warning: Cannot modify header information – headers already sent by
(output started at
/Applications/MAMP/htdocs/theme/wp-content/themes/test/header.php:10)
in /Applications/MAMP/htdocs/theme/wp-includes/pluggable.php on line
1178

I understand there has been already output before, that’s why it’s not working, but I have no clue how to make this work.

The signup form gets rendered by a function, and is submitted by another function, inside my functions.php.

if ( isset( $_POST['subscribe'] ) ) {
    // Submits the form and should then redirect
    wp_redirect("/thank-you/");
    exit;
}

Then both these functions are used where I want to show the signup form.

I’m afraid that’s not the best thing to do. I should be creating some action that does that, but I have no idea how to implement that. Most of the tutorials I found show the results directly on the same page and don’t require an additional redirect. Maybe that’s why they are working with functions inside the functions.php

Answers:

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Method 1

Found the answer (via)

Instead of using the function I added an action to “wp_loaded”, that makes sure that it gets loaded before any headers are sended.

<?php
add_action ('wp_loaded', 'my_custom_redirect');
function my_custom_redirect() {
    if ( isset( $_POST['subscribe'] ) ) {
        $redirect = 'http://example.com/redirect-example-url.html';
        wp_redirect($redirect);
        exit;
    }
}     
?>

Method 2

You have to use wp_redirect()
before get_header()
Then it will not show header error.

Method 3

add_action('template_redirect', function(){
if(isset($_POST['subscriptio'])){// make this condition such that it only matches when a registraiotn form get submitted
/**
 * do your stuff here
 */
wp_redirect();//....
}
});

Method 4

you can also do this

Instead of the below line

wp_redirect(“$url”);

write

echo("<script>location.href = '".$url."'</script>");

or

<?php <script><?php echo("location.href = '".$url."';");?></script>?>

It’ll definitely solve your problem.

Method 5

If you are creating a plugin, you can call ob_start(); at the beginning of the plugin code or ob_start(); at the top of the functions.php file before code begins

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0