PHP OOP: Shopping cart class

Last update on May 29 2025 13:10:22 (UTC/GMT +8 hours)

17. ShoppingCart Class

Write a PHP class called 'ShoppingCart' with properties like 'items' and 'total'. Implement methods to add items to the cart and calculate the total cost.

Sample Solution:

PHP Code :

<?php
class ShoppingCart {
    private $items;
    private $total;

    public function __construct() {
        $this->items = [];
        $this->total = 0;
    }

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

    public function getTotal() {
        return $this->total;
    }
}

$cart = new ShoppingCart();

$cart->addItem("Product 1", 20);
$cart->addItem("Product 2", 30);
$cart->addItem("Product 3", 10);

$total = $cart->getTotal();
echo "Total cost: $" . $total;

?>

Sample Output:

Total cost: $60

Explanation:

In the above exercise -

The "ShoppingCart" class has two private properties: $items and $total. $items is an associative array that stores the items in the cart as keys and their corresponding prices as values. $total keeps track of the total cost of all items in the cart.
The constructor method __construct() initializes the $items array as an empty array and sets the $total to 0.
The addItem($item, $price) method takes $item and its corresponding $price as parameters. It adds the item and its price to the $items array and increments the $total by the price.
The getTotal() method retrieves the total cost of the items in the cart.

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP class ShoppingCart that maintains a list of items and includes methods to add items and compute the total cost with tax.
Write a PHP script to simulate a shopping cart with dynamic item additions and then calculate and display the total price.
Write a PHP function to remove an item from the ShoppingCart by its index and then update the total cost accordingly.
Write a PHP program to implement discount calculation in the ShoppingCart class that adjusts the total based on item count.

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