3v4l.org

run code in 500+ PHP versions simultaneously
<?php $a = 1; $b = &$a; $b = 42; print $a;
Output for 7.0.0 - 7.0.23, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
42
preferences:
111.95 ms | 1622 KiB | 4 Q