OOP Practical Examples

OOP Practical Examples — a practical guide to OOP practical examples PHP with clear examples you can reuse in real projects.

OOP Tutorial Series (64/65). Prefer one article? Read the complete OOP tutorial.

Short description

Practical examples connect theory to code you can reuse in apps and interviews.

Mini cart example

class CartItem {
    public function __construct(public string $name, public int $priceCents, public int $qty = 1) {}
    public function lineTotal(): int { return $this->priceCents * $this->qty; }
}
class Cart {
    /** @var CartItem[] */
    private array $items = [];
    public function add(CartItem $item): void { $this->items[] = $item; }
    public function total(): int {
        return array_sum(array_map(fn (CartItem $i) => $i->lineTotal(), $this->items));
    }
}