PHP OOP: Shopping cart class

PHP OOP: Exercise-17 with Solution

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 :

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


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: Shopping cart class.

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Perform Arithmetic operations.
Next: Singleton design pattern implementation.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

Follow us on Facebook and Twitter for latest update.