3v4l.org

run code in 500+ PHP versions simultaneously
<?php $yearSpan = '2020-2021'; echo preg_replace_callback('/\d+/', fn($m) => --$m[0], $yearSpan);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
2019-2020
preferences:
72.93 ms | 1138 KiB | 4 Q