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<?php class Foo { private $data = 'some data'; } class Bar { private readonly string $data; public function __construct(string $data) { $this->data = $data; } } $foo = new Foo(); $bar = new Bar('some data'); (fn() => $this->data = 'other data')->call($foo); //(fn() => $this->data = 'other data')->call($bar); $foo2 = (fn() => $this->data)->call($foo); //$bar2 = (fn() => $this->data)->call($bar); echo $foo2; //echo $bar2;
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