3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php global $a; $a=5; function foo() { echo $a; } foo();
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: a in /in/94QbQ on line 7
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/94QbQ on line 7