3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo implements Stringable { public function __toString(): string { return 'Bar';} } class Bar {} $o = new Foo; echo (new ($o))::class;
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Foo

preferences:
65.61 ms | 410 KiB | 6 Q