3v4l.org

run code in 300+ PHP versions simultaneously
<?php $b = 23; $f = function ($a) use ($b) { echo $a; echo $b; }; $f(1); $f(2);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
123223
preferences:
156.89 ms | 404 KiB | 219 Q