Add-cart.php Num [best] Jun 2026

// Redirect user back to cart or product page header("Location: cart.php?success=added"); exit();

By properly implementing the add-cart.php num functionality, you ensure a robust shopping experience, allowing users to efficiently manage their desired product quantities.

if (isset($_SESSION['cart'][$product_id])) $new_qty = $_SESSION['cart'][$product_id] + $quantity; // Re-validate sum if ($new_qty > 99) $new_qty = 99;

$stock_query = "SELECT quantity FROM inventory WHERE product_id = " . $_GET['id'] . " AND num = " . $_GET['num']; // ^^^^^^^^^^^^^ // Injection point add-cart.php num

Or, via GET method (less secure, but common): /add-cart.php?product=456&num=3

// Bind Parameters (Prevents SQL Injection) $stmt->bindParam(':user_id', $user_id, PDO::PARAM_INT); $stmt->bindParam(':product_id', $product_id, PDO::PARAM_INT);

add-cart.php is a backend script (typically written in PHP) that handles the logic of adding a product to a user's session-based shopping cart. The num (short for number or quantity ) part of the request indicates that the script expects to receive a specific quantity of an item, rather than defaulting to one. // Redirect user back to cart or product

// Example AJAX call (using fetch) function updateQuantity(productId, newQuantity) fetch(`update-cart.php?id=$productId&num=$newQuantity`) .then(response => response.json()) .then(data => console.log('Cart updated', data); // Update subtotal using JS ); Use code with caution.

[ Client Browser ] --- POST Request (id=101, num=3) ---> [ add-cart.php ] | Is 'num' > 0 and integer? | +------ YES -------+-------- NO ------+ | | [Update PHP Session] [Reject Request / 400]

fetch('add-cart.php?id=5&num=2', headers: 'X-Requested-With': 'XMLHttpRequest' ) " AND num = "

<?php session_start();

The add-cart.php script is often a blind spot for session management. Attackers combine num injection with .

// Verify product exists and is in stock

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