In wordpress, how to redirect after a comment back to the referring page?

Question

I have comments enabled on different types of pages in Wordpress (archive, tag, search, main page), and after a user posts a comment I would like them to be redirected back to their referring page, not to the single post page. Any ideas?

Answer 1

I would advise against returning $_SERVER["HTTP_REFERER"] as it's not reliable.

The address of the page (if any) which referred the user agent to the current page. This is set by the user agent. Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted.

Source https://php.net/manual/en/reserved.variables.server.php

Here's an alternative

add_filter( 'comment_post_redirect', function ( $location ) {
    return get_permalink($_POST['comment_post_ID']);
} );