3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 1; $f = function() use ($a) { echo $a + 1; }; echo $a; //f();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
1

preferences:
160.58 ms | 403 KiB | 184 Q