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<?php $a = array('a' => null); var_dump($a); var_dump(isset($a['a'])); var_dump(array_key_exists('a', $a));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["a"]=> NULL } bool(false) bool(true)