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<?php $foo = new CatchMeIfYouCan(); var_dump($foo->bar); final class CatchMeIfYouCan { private int $_bar; private(set) int $bar { get => $this->_bar ??= $this->fooBar(); set { $this->_bar = $value; } } public function fooBar(): int { isset($this->_bar); return 42; } }