$_GET Çalışmıyor

<?php
                              
                               $language=$_GET['dil'];
                               
                                $query = $db->query("SELECT * FROM menu WHERE top = '0' AND language='$language' ORDER BY queue", PDO::FETCH_ASSOC);
                                if ($query->rowCount()) {


                                    foreach ($query as $row) {
                                        $query2 = $db->query("SELECT * FROM menu WHERE top = '{$row["id"]}' ORDER BY queue", PDO::FETCH_ASSOC);
                                        if ($query2->rowCount()) {
                                            echo ' <li>
                                            <a class="nav-link dropdown-toggle"  href="' . $row["slug"] . '" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                                            ' . $row["name"] . '</a><ul class="sub-menu" aria-labelledby="navbarDropdownMenuLink">';
                                            foreach ($query2 as $row2) {
                                                echo '<li><a class="dropdown-item " href="' . $row2["slug"] . '">' . $row2["name"] . '</a></li>';
                                            }
                                            echo '</ul></li>';
                                        } else {
                                            echo ' <li class="nav-item"><a class="nav-link" href="' . $row["slug"] . '">' . $row["name"] . '</a></li>';
                                        }
                                    }
                                }


  ?>

<?php


if(isset($_GET['dil'])) {
    $language = $_GET['dil'];
    $_SESSION['dil'] = $dil;
    header('location'.$_SERVER['HTTP_REFERER']);
} else {
    $_SESSION['dil'] = "tr";
}


?>