3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 'foo'; $b = ['a' => a];
based on 7TEUH
Output for 7.2.0
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/cHPHL on line 3
Output for 5.4.0 - 7.1.10
Notice: Use of undefined constant a - assumed 'a' in /in/cHPHL on line 3
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/cHPHL on line 3
Process exited with code 255.