3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A{ const A = 'A'; const X = self::A; } class B extends A{ const A = 'B'; } print(B::X . A::X);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 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 - 8.3.6
AA
preferences:
156.88 ms | 403 KiB | 186 Q