3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array("foo" => "bar"); echo "Give me {$a[foo]}";
Output for 7.2.0 - 7.3.0rc4
Warning: Use of undefined constant foo - assumed 'foo' (this will throw an Error in a future version of PHP) in /in/PNtcd on line 3 Give me bar
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.21.3, 7.0.0 - 7.1.23
Notice: Use of undefined constant foo - assumed 'foo' in /in/PNtcd on line 3 Give me bar
Output for hhvm-3.22.0
Notice: Use of undefined constant foo - assumed 'foo' in /in/PNtcd on line -1 Give me bar