3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 1; $f = function() use ($a) { $_GLOBALS["a"] = 2; echo $a + 1; }; echo $a; $f();
based on brJfl
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
12