Online PHP editor | output for oK89U

<?php class Kitchen { private $yummy = 'cake'; } class Mapper { public function map(Kitchen $kitchen, array $data) { $mapper = $this; $map = function (Kitchen $kitchen, array $data) use ($mapper) { $mapper->setYummy($kitchen, $data); }; $map = Closure::bind($map, null, $kitchen); $map($kitchen, $data); } public function setYummy(Kitchen $kitchen, array $data) { $kitchen->yummy = $data['yummy']; } } $kitchen = new Kitchen; $mapper = new Mapper; $mapper->map($kitchen, ['yummy' => 'cookie']); var_dump($kitchen); /* $sweetsThief = function (Kitchen $kitchen) { return $kitchen->yummy; }; $sweetsCop = function (Kitchen $kitchen, $yummy) { $kitchen->yummy = $yummy; }; $kitchen = new Kitchen(); $sweetsThief = Closure::bind($sweetsThief, null, $kitchen); $sweetsCop = Closure::bind($sweetsCop, null, $kitchen); var_dump($sweetsThief($kitchen)); $sweetsCop($kitchen, 'lie'); var_dump($sweetsThief($kitchen)); */