prepare("SELECT * FROM products WHERE id IN ($placeholders)");
$stmt->execute($product_ids);
$products = $stmt->fetchAll();
foreach ($products as $product) {
$product_id = $product['id'];
$quantity = $_SESSION['cart'][$product_id];
$subtotal = $product['price'] * $quantity;
$total += $subtotal;
$cart_items[] = [
'id' => $product_id,
'name' => $product['name'],
'price' => $product['price'],
'quantity' => $quantity,
'subtotal' => $subtotal
];
}
}
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['update_cart'])) {
foreach ($_POST['quantities'] as $product_id => $quantity) {
if ($quantity > 0) {
$_SESSION['cart'][$product_id] = (int)$quantity;
} else {
unset($_SESSION['cart'][$product_id]);
}
}
header("Location: cart.php");
exit;
}
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['checkout'])) {
if (!isset($_SESSION['user_id'])) {
header("Location: login.php");
exit;
}
if (empty($cart_items)) {
header("Location: shop.php");
exit;
}
$pdo = db();
try {
$pdo->beginTransaction();
// Check if user has enough balance
$stmt = $pdo->prepare("SELECT balance FROM users WHERE id = ?");
$stmt->execute([$_SESSION['user_id']]);
$user = $stmt->fetch();
if ($user['balance'] < $total) {
// Not enough balance
$pdo->rollBack();
// Redirect to cart with an error message
header("Location: cart.php?error=balance");
exit;
}
// Create order
$stmt = $pdo->prepare("INSERT INTO orders (user_id, total) VALUES (?, ?)");
$stmt->execute([$_SESSION['user_id'], $total]);
$order_id = $pdo->lastInsertId();
// Create order items
$stmt = $pdo->prepare("INSERT INTO order_items (order_id, product_id, quantity, price) VALUES (?, ?, ?, ?)");
foreach ($cart_items as $item) {
$stmt->execute([$order_id, $item['id'], $item['quantity'], $item['price']]);
}
// Deduct balance from user
$new_balance = $user['balance'] - $total;
$stmt = $pdo->prepare("UPDATE users SET balance = ? WHERE id = ?");
$stmt->execute([$new_balance, $_SESSION['user_id']]);
$pdo->commit();
// Clear cart
unset($_SESSION['cart']);
// Redirect to a success page
header("Location: order_success.php?order_id=" . $order_id);
exit;
} catch (Exception $e) {
$pdo->rollBack();
// Log the error
error_log($e->getMessage());
// Redirect to cart with a generic error
header("Location: cart.php?error=checkout");
exit;
}
}
?>
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