<?php class Foo { public function __construct(private Bar $bar, private string $_value = 'foo') {} public function __get(string $name) { return match($name) { 'value' => $this->_value, }; } public function __set(string $name, string $value) { switch ($name) { case 'value': $this->bar->doSomething($this); $this->_value = $value; } } } class Bar { public function doSomething(Foo $foo): void { $oldValue = $foo->value; } } $foo = new Foo(new Bar()); $foo->value = 'bar';
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