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<?php class Acme { public function __construct( public readonly int $changeMe, ) {} } $object = new Acme(1); $reflection = new ReflectionClass($object); $instance = $reflection->newInstanceWithoutConstructor(); $reflectionProperty = $reflection->getProperty('changeMe'); $reflectionProperty->setValue($instance, 33); var_dump($reflectionProperty->getValue($instance));
Output for git.master, git.master_jit, rfc.property-hooks
int(33)

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