3v4l.org

run code in 300+ 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 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
2019-2020
preferences:
93.24 ms | 1099 KiB | 4 Q