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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 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.5 - 8.3.30, 8.4.1 - 8.4.17, 8.5.0 - 8.5.2
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.
Output for 8.0.1 - 8.0.28
Parse error: syntax error, unexpected token "?", expecting variable in /in/FrhLN on line 7
Process exited with code 255.
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