3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array('k' => null); var_dump(isset($a[$k]));
Output for 5.0.4 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: k in /in/65WCf on line 5 bool(false)
Output for hhvm-3.10.0 - 3.12.0
bool(false)
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: k in /in/65WCf on line 5 bool(false)