3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A{ const X = self::A; const A = 'A'; } class B extends A{ const A = 'B'; } print(B::X . A::X);
Output for 7.1.4 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
AA
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.3
BB
preferences:
178.26 ms | 402 KiB | 172 Q