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<?php declare(strict_types=1); final class Foo { public readonly ?int $id; } $object = new Foo(); $reflection = new ReflectionClass($object); $instance = $reflection->newInstanceWithoutConstructor(); $reflectionProperty = $reflection->getProperty('id'); $reflectionProperty->setValue($instance, 42); $reflectionProperty->setValue($instance, null); var_dump($reflectionProperty->getValue($instance));
Output for git.master, git.master_jit
Fatal error: Uncaught Error: Cannot modify readonly property Foo::$id in /in/FrhLN:15 Stack trace: #0 /in/FrhLN(15): ReflectionProperty->setValue(Object(Foo), NULL) #1 {main} thrown in /in/FrhLN on line 15
Process exited with code 255.

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