3v4l.org

run code in 300+ PHP versions simultaneously
<?php const ONE = 1; class foo { const TWO = ONE * 2; } echo foo::TWO; ?>
Output for 5.6.0 - 5.6.23, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
2

preferences:
154.29 ms | 404 KiB | 218 Q