3v4l.org

run code in 300+ PHP versions simultaneously
<?php function readonly() { } $var = readonly ();
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11
preferences:
68.26 ms | 406 KiB | 5 Q