<?php final class Thing { private string $state; public function __construct() { $this->state = 'foo'; } public function __set(string $property, $value) : void { if ((\debug_backtrace()[1]['object'] ?? null) !== $this) { throw new \Exception('nope'); } $this->$property = $value; } } $thing = new Thing(); var_dump($thing); $thing->state = 'this should never be allowed';
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