What are some best practices for efficiently managing and updating values in a PHP session array when building a shopping cart feature?

When building a shopping cart feature in PHP, it is important to efficiently manage and update values in the session array to keep track of the items added by the user. One best practice is to use unique identifiers for each product in the cart to easily update quantities or remove items. Additionally, regularly sanitize and validate input data to prevent security vulnerabilities. 

// Start the session
session_start();

// Function to add a product to the cart
function addProductToCart($productId, $quantity) {
    if(isset($_SESSION['cart'][$productId])) {
        $_SESSION['cart'][$productId] += $quantity;
    } else {
        $_SESSION['cart'][$productId] = $quantity;
    }
}

// Function to update the quantity of a product in the cart
function updateProductQuantity($productId, $quantity) {
    if(isset($_SESSION['cart'][$productId])) {
        $_SESSION['cart'][$productId] = $quantity;
    }
}

// Function to remove a product from the cart
function removeProductFromCart($productId) {
    if(isset($_SESSION['cart'][$productId])) {
        unset($_SESSION['cart'][$productId]);
    }
}

Keywords

PHP session array manipulation shopping cart efficiency updates

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