Online PHP editor | refs for N4nc9

<?php class StatefulAdderFactory { private $x = 1; function getAdder() { return new class($this->x) { function add($y) { $this->x += $y; return $this->x; } }; } } $saf = new StatefulAdderFactory(); $adder = $saf->getAdder(); var_dump($adder->add(42)); var_dump($adder->add(21));