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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); var_dump(is_null($a['a']['b']));
Output for 5.3.0 - 7.1.0
Notice: Undefined index: a in /in/sUbQG on line 4 bool(true)
Output for 4.3.0 - 5.2.17
Notice: Undefined index: a in /in/sUbQG on line 4 bool(true)