3v4l.org

run code in 300+ PHP versions simultaneously
<?php define ('X', 9); const xyt = [5,X]; var_dump(xyt);
Output for 7.0.0 - 7.0.20, 7.1.0 - 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
array(2) { [0]=> int(5) [1]=> int(9) }
preferences:
127.83 ms | 404 KiB | 174 Q