3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = false; $y = (function () use ($x) { $x = true; }); $y(); var_dump( $x );
Output for 7.0.0 - 7.0.24, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.22, 8.1.0 - 8.1.9
bool(false)

preferences:
18.43 ms | 410 KiB | 5 Q