3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace { new X\A; } namespace X { class B {} class A extends B {} }
Output for 7.1.0 - 7.1.21, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7

preferences:
50.39 ms | 409 KiB | 5 Q