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<?php $fruitpacks = [ ['apples', 3], ['pears', 1], ['apples', 6], ['grapes', 22], ]; final class Basket { private $items; private function __construct(array $items) { $this->items = $items; } public function add(string $name, int $quantity) : self { return new self([$name => $quantity + ($this->items[$name] ?? 0)] + $this->items); } public function asArray() : array { return $this->items; } public static function empty() : self { return new self([]); } public static function addToBasket(self $basket, array $item) : self { return $basket->add(...$item); } } var_dump(array_reduce($fruitpacks, [Basket::class, 'addToBasket'], Basket::empty())->asArray());
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(3) { ["grapes"]=> int(22) ["apples"]=> int(9) ["pears"]=> int(1) }

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156.11 ms | 403 KiB | 197 Q