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<?php final class Mutable { private $x; public function __construct(int $x) { $this->x = $x; } public function setX(int $x): void { $this->x = $x; } public function x(): int { return $this->x; } } final class User { private $m; public function __construct(Mutable $m) { $this->m = $m; } public function x(): void { echo "{$this->m->x()}\n"; } } $m = new Mutable(42); $u = new User($m); $u->x(); $m->setX(-1); $u->x();
Output for git.master, git.master_jit, rfc.property-hooks
42 -1

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