Online PHP editor | refs for YMQer

<?php class Item { private $id; public function __construct(int $id) { $this->id = $id; } public function id() : int { return $this->id; } } class Collection extends IteratorIterator { public function __construct(Item ...$items) { parent::__construct( (function() use ($items) { yield from $items; })() ); } public function current() : Item { return parent::current(); } } $items = []; for ($i=0; $i<10; $i++) { $items[] = new Item($i); } $collection = new Collection(...$items); foreach ($collection as $item) { printf("\tClass: %s. Calling id() method returns %d (%s)\n", get_class($item), $item->id(), gettype($item->id())); }