Addcartphp Num High Quality May 2026

The cart.php page must respect the num values stored and allow further updates.

<?php
session_start();
// ... database connection ...
$cart_items = [];
$total = 0;
if (!empty($_SESSION['cart'])) 
$ids = array_keys($_SESSION['cart']);
$placeholders = implode(',', array_fill(0, count($ids), '?'));
$stmt = $pdo->prepare("SELECT id, name, price, stock_quantity FROM products WHERE id IN ($placeholders)");
$stmt->execute($ids);
$products = $stmt->fetchAll(PDO::FETCH_ASSOC); addcartphp num high quality
foreach ($products as $product) 
    $qty = $_SESSION['cart'][$product['id']]['quantity'];
    // Re-validate stock (in case inventory changed between add and cart view)
    if ($qty > $product['stock_quantity']) 
        $qty = $product['stock_quantity'];
        $_SESSION['cart'][$product['id']]['quantity'] = $qty;
$subtotal = $product['price'] * $qty;
    $total += $subtotal;
    $cart_items[] = [
        'product' => $product,
        'quantity' => $qty,
        'subtotal' => $subtotal
    ];


?>
<!-- Cart Table -->
<table>
<thead>
<tr><th>Product</th><th>Price</th><th>Quantity (num)</th><th>Subtotal</th></tr>
</thead>
<tbody>
<?php foreach ($cart_items as $item): ?>
<tr>
<td><?= htmlspecialchars($item['product']['name']) ?></td>
<td>$<?= number_format($item['product']['price'], 2) ?></td>
<td>
<form action="update_cart.php" method="post" class="update-qty-form">
<input type="hidden" name="product_id" value="<?= $item['product']['id'] ?>">
<input type="number" name="num" value="<?= $item['quantity'] ?>" min="1" max="<?= $item['product']['stock_quantity'] ?>">
<button type="submit">Update</button>
</form>
</td>
<td>$<?= number_format($item['subtotal'], 2) ?></td>
</tr>
<?php endforeach; ?>
</tbody>
</table>
<p><strong>Total: $<?= number_format($total, 2) ?></strong></p>
 The  cart

To view cart contents:

function viewCart() 
    if (isset($_SESSION['cart'])) 
        echo "Your Cart:\n";
        foreach ($_SESSION['cart'] as $productId => $product) 
            echo "$product['name'] x $product['quantity'] = $product['price'] * $product['quantity']\n";
else 
        echo "Your cart is empty.";

Let's assume you're adding a product with a unique id, name, price, and a num (quantity) you want to add.

function addToCart($id, $name, $price, $num) 
    // Assuming $_SESSION['cart'] is already set up
// Check if item is already in cart
    foreach ($_SESSION['cart'] as &$item) 
        if ($item['id'] == $id) 
            $item['num'] += $num;
            return;
// If item is not in cart, add it
    $_SESSION['cart'][] = array(
        'id' => $id,
        'name' => $name,
        'price' => $price,
        'num' => $num
    );
// Example usage
addToCart(1, "Sample Product", 19.99, 2);

// After login check
if ($num > 0 && $num <= $product['stock_quantity']) 
    $stmt = $pdo->prepare("
        INSERT INTO cart_items (user_id, product_id, quantity) 
        VALUES (?, ?, ?)
        ON DUPLICATE KEY UPDATE quantity = quantity + ?
    ");
    $stmt->execute([$_SESSION['user_id'], $product_id, $num, $num]);
// Validate final quantity does not exceed stock
$check = $pdo->prepare("
    SELECT ci.quantity, p.stock_quantity 
    FROM cart_items ci 
    JOIN products p ON ci.product_id = p.id
    WHERE ci.user_id = ? AND ci.product_id = ?
");
$check->execute([$_SESSION['user_id'], $product_id]);
$row = $check->fetch();
if ($row['quantity'] > $row['stock_quantity']) 
    // Rollback
    $pdo->prepare("UPDATE cart_items SET quantity = ? WHERE user_id = ? AND product_id = ?")
        ->execute([$row['stock_quantity'], $_SESSION['user_id'], $product_id]);
    die(json_encode(['error' => 'Adjusted to max stock']));