Better | Add-cart.php Num

A file named add-cart.php typically handles the server-side logic for adding a product to a shopping cart session in custom PHP e-commerce applications. The parameter num (often abbreviated for "number") usually refers to the quantity of the item being added. Role of add-cart.php

Database Table: cart_items

// 2. Database lookup (Prepared statement) $pdo = new PDO(...); $stmt = $pdo->prepare("SELECT price, stock FROM products WHERE id = ? AND active = 1"); $stmt->execute([$product_id]); $product = $stmt->fetch(); add-cart.php num

• Providing Flexibility: Allowing users to add or remove products easily.
• Maintaining Cart State: Keeping track of products and quantities in the cart across different pages of the website.
• Streamlining Checkout: Facilitating a smooth transition from product selection to payment processing.

// Helper function for notifications function showNotification(message, type) const notification = document.createElement('div'); notification.className = notification notification-$type; notification.textContent = message; document.body.appendChild(notification); A file named add-cart

If you must keep ?num=, document its exact format and validate rigorously. Providing Flexibility : Allowing users to add or

<?php
session_start();
if(isset($_GET['id']) && isset($_GET['num'])) 
    $product_id = $_GET['id'];
    $quantity = $_GET['num']; // No validation!
$_SESSION['cart'][$product_id] = $quantity;
header('Location: cart.php');

Example PHP implementation (concise)
The num parameter (or qty) specifically refers to the quantity of the item being added.

A file named add-cart.php typically handles the server-side logic for adding a product to a shopping cart session in custom PHP e-commerce applications. The parameter num (often abbreviated for "number") usually refers to the quantity of the item being added. Role of add-cart.php

Database Table: cart_items

// 2. Database lookup (Prepared statement) $pdo = new PDO(...); $stmt = $pdo->prepare("SELECT price, stock FROM products WHERE id = ? AND active = 1"); $stmt->execute([$product_id]); $product = $stmt->fetch();

• Providing Flexibility: Allowing users to add or remove products easily.
• Maintaining Cart State: Keeping track of products and quantities in the cart across different pages of the website.
• Streamlining Checkout: Facilitating a smooth transition from product selection to payment processing.

// Helper function for notifications function showNotification(message, type) const notification = document.createElement('div'); notification.className = notification notification-$type; notification.textContent = message; document.body.appendChild(notification);

If you must keep ?num=, document its exact format and validate rigorously.

<?php
session_start();
if(isset($_GET['id']) && isset($_GET['num'])) 
    $product_id = $_GET['id'];
    $quantity = $_GET['num']; // No validation!
$_SESSION['cart'][$product_id] = $quantity;
header('Location: cart.php');

Example PHP implementation (concise)
The num parameter (or qty) specifically refers to the quantity of the item being added.