3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A{}; class B{}; /* @var A $a */ $a = unserialize(serialize(new A())); assert($a instanceof A); var_dump($a);
Output for 8.1.12 - 8.1.33, 8.2.10 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
object(A)#1 (0) { }

preferences:
74.48 ms | 406 KiB | 5 Q