Redirect First-Time Commenters

function redirect_first_time_commenters($location, $comment) {
    if ($comment->comment_approved === '1' && !$comment->user_id && !get_comments(array('author_email' => $comment->comment_author_email, 'count' => true))) {
        $location = home_url('/thank-you-for-commenting/');
    }
    return $location;
}
add_filter('comment_post_redirect', 'redirect_first_time_commenters', 10, 2);