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<?php function updateObject(object $object): void { $object->newProperty = true; } $obj = new stdClass; var_dump($obj); updateObject($obj); var_dump($obj);
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
object(stdClass)#1 (0) { } object(stdClass)#1 (1) { ["newProperty"]=> bool(true) }

preferences:
26.67 ms | 1137 KiB | 7 Q