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<?php class Foo { public function __construct( private readonly int $a, private readonly string $b, ) { } public function withA(int $a): self { return new self(...(get_defined_vars() + get_object_vars($this))); } public function withB(string $b): self { return new self(...(get_defined_vars() + get_object_vars($this))); } } $f = (new Foo(1, "foo")) ->withA(2) ->withB("bar"); var_dump($f);
Output for git.master, rfc.property-hooks, git.master_jit
object(Foo)#1 (2) { ["a":"Foo":private]=> int(2) ["b":"Foo":private]=> string(3) "bar" }

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