Online PHP editor | output for 5OGnc

<?php class Item { private static $cost = 100; public function getTotal($discount = 7) { return self::cost * $discount/(100+$discount); } } class Hydrator { public function getPrivate($obj, $attribute) { $getter = function() use ($attribute) {return $this->$attribute;}; return \Closure::bind($getter, $obj, get_class($obj)); } public function setPrivate($obj, $attribute) { $setter = function($value) use ($attribute) {$this->$attribute = $value;}; return \Closure::bind($setter, $obj, get_class($obj)); } } $obj = new Item(); $hydrated = new Hydrator(); $getFoo = $hydrated->getPrivate($obj, 'cost'); $setFoo = $hydrated->setPrivate($obj, 'cost'); echo $obj->getTotal() .PHP_EOL; $setFoo(1); echo $obj->getTotal() .PHP_EOL;