Татьяна Комарова

return $section_wall_data->setVotedUsers($_POST['post_id'], $_POST['user_id'], $_POST['type_vote']);

if(!empty($error)){
        return json_encode(array('result' => 'error', 'msg' => $error));
    }else{
        return json_encode(array('result' => 'success'));
    }

<input type="hidden" name="page-title" style="display:none">

<script>document.querySelector("input[name='page-title']").value = document.title</script>