PHP Code
<?php function calculateTotal($items,$taxRate=0.08){ $subtotal=0; foreach($items as $item){ if($item['quantity']>0){ $lineTotal=$item['price']*$item['quantity']; $subtotal+=$lineTotal; }else{ throw new \InvalidArgumentException("Quantity must be positive"); } } $tax=$subtotal*$taxRate; $total=$subtotal+$tax; return ['subtotal'=>$subtotal,'tax'=>$tax,'total'=>$total]; } class ShoppingCart{ private array $items=[]; public function addItem(string $name,float $price,int $qty=1):void{ $this->items[]=['name'=>$name,'price'=>$price,'quantity'=>$qty]; } public function getTotal():array{ return calculateTotal($this->items); } } ?>
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