3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $arrayKey = '[0][1]'; $a[0][1] = "two levels deep"; echo ${'a'.$arrayKey};
based on 54o3Z
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: a[0][1] in /in/7RXAJ on line 8
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a[0][1] in /in/7RXAJ on line 8