Online PHP editor | refs for FGJo8

<?php class Foo { private $bar = 'A'; public function withNewBar($bar) { $obj = clone($this); $obj->bar = $bar; return $obj; } public function changeBarOnANewFoo($bar) { $obj = new Foo(); $obj->bar = $bar; return $obj; } public function changeBarOnAnotherFoo(Foo $obj, $bar) { $obj->bar = $bar; } public function bar() { return $this->bar; } } $one = new Foo(); $two = $one->withNewBar('B'); $three = $one->changeBarOnANewFoo('C'); $four = new Foo(); $one->changeBarOnAnotherFoo($four, 'D'); var_dump($one->bar() === 'A' ); var_dump($two->bar() === 'B' ); var_dump($three->bar() === 'C' ); var_dump($four->bar() === 'D' );