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<?php final class B {} class_alias(B::class, 'a'); $serializedInstanceOfA = 'O:1:"a":0:{}'; var_dump(unserialize($serializedInstanceOfA));
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
object(B)#1 (0) { }

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60.45 ms | 1026 KiB | 4 Q