What is the purpose of the class for handling shopping cart functionality in PHP?

The purpose of the class for handling shopping cart functionality in PHP is to create a reusable and organized way to manage the items that a user has added to their shopping cart while browsing an online store. This class typically includes methods for adding items to the cart, removing items from the cart, updating quantities, calculating totals, and displaying the contents of the cart. 

<?php
class ShoppingCart {
    private $items = array();

    public function addItem($product_id, $quantity, $price) {
        $this->items[$product_id] = array(
            'quantity' => $quantity,
            'price' => $price
        );
    }

    public function removeItem($product_id) {
        unset($this->items[$product_id]);
    }

    public function updateQuantity($product_id, $quantity) {
        $this->items[$product_id]['quantity'] = $quantity;
    }

    public function calculateTotal() {
        $total = 0;
        foreach ($this->items as $item) {
            $total += $item['price'] * $item['quantity'];
        }
        return $total;
    }

    public function displayCart() {
        foreach ($this->items as $product_id => $item) {
            echo "Product ID: $product_id | Quantity: {$item['quantity']} | Price: {$item['price']} <br>";
        }
    }
}
?>

Keywords

PHP class shopping cart functionality handling

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