3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { const A = "fooa"; const B = self::A . self::C; const C = "fooc"; } class Bar extends Foo { const A = "bara"; const C = "barc"; } var_dump(Bar::B);
Output for 7.1.5 - 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(8) "fooafooc"
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.3
string(8) "fooabarc"
preferences:
99.08 ms | 1430 KiB | 4 Q