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<?php $a = []; $a['a'] = null; $a['b'] = false; var_dump(isset($a['a'])); var_dump(isset($a['b']));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
bool(false) bool(true)