3v4l.org

run code in 500+ PHP versions simultaneously
<?php function x(Container $a): Container { return "A"; }
Output for 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
preferences:
47.25 ms | 743 KiB | 4 Q