Online PHP editor | refs for 0f4HL

<?php namespace Generics; class CollectionᐸTᐳ implements \Countable { private $items = []; public function add(T $item) { $this->items[] = $item; } public function count() { return count($this->items); } } $dates = new CollectionᐸDateTimeᐳ(); $dates->add(new DateTime('yesterday')); $dates->add(new DateTime('today')); $dates->add(new DateTime('tomorrow')); echo count($dates); class T extends \DateTime {} class DateTime extends T {}; class CollectionᐸDateTimeᐳ extends CollectionᐸTᐳ {}