6_objects.php

// The PricedEntree class referencing that namespace:
class PricedEntree extends Entree {
public function __construct($name, $ingredients) {
parent::__construct($name, $ingredients);
foreach ($this->ingredients as $ingredient) {
if (! $ingredient instanceof \Meals\Ingredient) {
throw new Exception('Elements of $ingredients must be Ingredient objects');
}
}
}
public function getCost() {
$cost = 0;
foreach ($this->ingredients as $ingredient) {
$cost += $ingredient->getCost();
}
return $cost;