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 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
preferences:
54.17 ms | 754 KiB | 4 Q