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<?php class Item { private $id; public function __construct(int $id) { $this->id = $id; } public function id() : int { return $this->id; } } class Collection extends ArrayIterator { 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())); }
Output for git.master, git.master_jit, rfc.property-hooks
Class: Item. Calling id() method returns 0 (integer) Class: Item. Calling id() method returns 1 (integer) Class: Item. Calling id() method returns 2 (integer) Class: Item. Calling id() method returns 3 (integer) Class: Item. Calling id() method returns 4 (integer) Class: Item. Calling id() method returns 5 (integer) Class: Item. Calling id() method returns 6 (integer) Class: Item. Calling id() method returns 7 (integer) Class: Item. Calling id() method returns 8 (integer) Class: Item. Calling id() method returns 9 (integer)

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