unset ile sessioni silme sorunu

/*
session
shoppingCart
products
kedi maması ...2... 100.....200
köpek maması ...2....1000....2000
summary
adet ürün 400
//////////////////////////////////////////

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

session_start();


//echo"removeFromCart";
echo $product_id1 = $_POST["product_id"];
$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 'malisef';}


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

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

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");
}

function removeFromcart($product_id) {
session_start();
$product_id=$_POST['product_id'];
if(isset($_SESSION["shoppingCart"])){
$shoppingCart = $_SESSION["shoppingCart"];
$products = $shoppingCart["products"];
//urunu listeden çıkar
if(array_key_exists($product_id, $products)){
unset($_SESSION['shoppingCart']['products'][$product_id]);
echo "Bu ürünü septten çıkardınız";
}//array_key_exists
//tekrardan sepete hesapla


$total_price =0.0; $total_count=0;

// $product_id_key = $product_id ;
foreach($products as $key => $product ){


$urun_takim_fiyat = $product['a-siparis'] * $product["satis_fiyat"];
$products[$key]['total_price'] = $urun_takim_fiyat; //products diziye ekle

$total_count += $product['a-siparis'];
$total_price += $urun_takim_fiyat;

$summary["total_count"]=$total_count;
$summary["total_price"]=$total_price;
// $_SESSION["shoppingCart"]["products"] = $products;
$_SESSION["shoppingCart"]["summary"]= $summary;



}
$guncellenenfiyat["Uretim_Adedi"]=$total_count;
$guncellenenfiyat["Sepet_Toplam_Fiyat"]=$total_price;
$_SESSION["shoppingCart"]["guncellenenfiyat"]= $guncellenenfiyat;
return $total_count;


} //if
}//func