3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 'outside'; $f = function () use ($a) { echo $a; }; class C { public static function foo($f) { $a = 'inside'; $f(); } } C::foo($f);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
outside
preferences:
286.63 ms | 404 KiB | 339 Q