3v4l.org

run code in 300+ PHP versions simultaneously
<?php $bar = 123; $one = function() use($bar){ echo $bar . "\n"; }; $two = function() use(&$bar){ echo $bar; }; $bar = 456; $one(); $two();
Output for 7.1.25 - 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 - 8.3.6
123 456
preferences:
169.25 ms | 403 KiB | 182 Q