3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $test = array( 'a' => array( 'intern' => 'HELLO' ) ); echo $test['a[intern]'];
Output for 5.3.0 - 7.2.0
Notice: Undefined index: a[intern] in /in/PGXPp on line 8
Output for 4.3.0 - 5.2.17
Notice: Undefined index: a[intern] in /in/PGXPp on line 8