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<?php class ReadonlyWakeupWithReflection { public function __construct(public readonly string $value) {} public function __wakeup(): void { (new \ReflectionProperty($this, 'value'))->setValue($this, 'set by reflection on wakeup'); } } $obj = new ReadonlyWakeupWithReflection('test'); $serialized = serialize($obj); $unserialized = unserialize($serialized); print $unserialized->value;
Output for git.master_jit, git.master
Fatal error: Uncaught Error: Cannot modify readonly property ReadonlyWakeupWithReflection::$value in /in/3mViB:7 Stack trace: #0 /in/3mViB(7): ReflectionProperty->setValue(Object(ReadonlyWakeupWithReflection), 'set by reflecti...') #1 [internal function]: ReadonlyWakeupWithReflection->__wakeup() #2 /in/3mViB(13): unserialize('O:28:"ReadonlyW...') #3 {main} thrown in /in/3mViB on line 7
Process exited with code 255.

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