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<?php $test = array('t1'=> NULL); var_dump($test); var_dump($test['t1']); var_dump(isset($test['t1']));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["t1"]=> NULL } NULL bool(false)