Online PHP editor | output for S5aRF

<?php declare(strict_types=1); interface Factory { public function build(): Product; } interface Product { } class A implements Product { } class B implements Product { } class FA implements Factory { public function build(): Product { return new A; } } class FB implements Factory { public function build(): Product { return new A; } } class Client { private $f; public function __construct(Factory $f) { $this->f = $f; } public function payload() { var_dump($this->f->build()); } } $fa = new FA; $clientA = new Client($fa); $clientA->payload(); $fb = new FB; $clientB = new Client($fb); $clientB->payload();