3v4l.org

run code in 150+ php & hhvm versions
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<?php $a = array('qwe' => $a['qwe']); var_dump(isset($a['qwe']));
based on 0YDDj
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: a in /in/9RNpW on line 3 bool(false)
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/9RNpW on line 3 bool(false)