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run code in 150+ php & hhvm versions
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<?php $array = array('foo'=>null); $notexists = !array_key_exists('foo', $array); $empty = empty($array['foo']); var_dump($notexists, $empty, $notexists || $empty);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true) bool(true)