3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array('qwe' => $a['qwe']); var_dump($a);
based on 9RNpW
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: a in /in/ufmg9 on line 3 array(1) { ["qwe"]=> NULL }
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/ufmg9 on line 3 array(1) { ["qwe"]=> NULL }