function removeFromCart($product_id){
    //include("ust.php");

    session_start();

    //echo"removeFromCart";

    // product_id kontrolü
    if(isset($_POST["product_id"])){
        $product_id1 = $_POST["product_id"];
    } else {
        echo "Ürün ID belirtilmedi.";
        return;
    }

    if(isset($_SESSION["shoppingCart"]) && isset($_SESSION["shoppingCart"]["products"])){
        $shoppingCart = $_SESSION["shoppingCart"];
        $products = $shoppingCart["products"];

        echo "<pre>";
        // print_r($_SESSION);
        print($products[$product_id1]['id']);
        echo "</pre>";/**/

        if (array_key_exists($product_id1, $products)) {
            // Ürün zaten varsa, adedini artır
            // $products[$product_id_key]['a-siparis'] += $siparis_adet;
            // echo '<strong style="color:red;">Ürün adedi artırıldı</strong>';
            unset($products[$product_id1]);
            // print_r($products[1]);
            /*
            unset($products[$product_id1 ]);*/

        } else {
            echo 'Ürün bulunamadı.';
        }
    } else {
        echo 'Sepetinizde ürün bulunmamaktadır.';
    }

    //unset ($shopping_products[$product_id1]);
    //session_destroy();

    // include("alt.php");
}