3v4l.org

run code in 500+ PHP versions simultaneously
<?php class Foo { readonly int $bar; }
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
preferences:
59.21 ms | 861 KiB | 4 Q