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 - 8.1.28, 8.2.10 - 8.2.18, 8.3.0 - 8.3.7
object(A)#1 (0) { }
preferences:
59.72 ms | 402 KiB | 29 Q