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Filename : quantity_ajax.php

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<?php
include_once '../function.php';
session_start();

if (!isset($_SESSION['session_id'])) {
    $_SESSION['session_id'] = session_id();
}
$session_id = $_SESSION['session_id'];

if (isset($_POST['quantity']) && isset($_POST['order_cart_id'])) {
    $quantity = (int) $_POST['quantity'];
    $order_cart_id = (int) $_POST['order_cart_id'];
    $product_price = (float) $_POST['product_price'];

    if ($quantity < 1) {
        $quantity = 1;
    }

    $new_order_price = $quantity * $product_price;

    // ✅ Update order price & quantity in DB
    mysqli_query($connect, 
        "UPDATE order_cart 
         SET quantity = '$quantity', order_price = '$new_order_price' 
         WHERE order_cart_id = '$order_cart_id' AND session_id = '$session_id'"
    ) or die(mysqli_error($connect));

    echo number_format($new_order_price, 2, '.', '');
}
?>