3v4l.org

run code in 300+ PHP versions simultaneously
<?php class a {} $a = new a; // object(a)#1 (0) {} var_dump($b = clone clone clone $a); // object(a)#2 (0) {} var_dump(new (new $a)); // object(a)#3 (0) {}
Output for 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
object(a)#2 (0) { } object(a)#3 (0) { }

preferences:
49.41 ms | 843 KiB | 4 Q