PHP chuyển trang Redirect

redirect.php

<?php
function devCheckInput($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}

if (!empty($_SERVER['QUERY_STRING'])) {
    $queryString = "?" . devCheckInput($_SERVER['QUERY_STRING']);
} else {
    $queryString = "?utm_source=Direct&utm_agent=Direct&utm_content=Direct&utm_campaign=Direct&utm_medium=CPC&utm_team=Direct&product=";
}

header("Location: https://domain.vn/$queryString");
die();
?>