What are the key considerations when developing a custom shopping cart in PHP?

When developing a custom shopping cart in PHP, key considerations include ensuring secure payment processing, implementing user-friendly interfaces for adding/removing items, calculating totals accurately, and providing options for discounts or promotions. 

// Example PHP code snippet for a basic custom shopping cart implementation

class ShoppingCart {
    private $items = array();

    public function addItem($item, $quantity) {
        $this->items[$item] = $quantity;
    }

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

    public function calculateTotal() {
        $total = 0;
        foreach ($this->items as $item => $quantity) {
            // Calculate total based on item price and quantity
            $total += $item->price * $quantity;
        }
        return $total;
    }
}

// Example usage:
$cart = new ShoppingCart();
$cart->addItem('Product A', 2);
$cart->addItem('Product B', 1);

echo 'Total: $' . $cart->calculateTotal();

Keywords

security encryption payment gateways session management database normalization

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