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<?php $arr = array(NULL => 'foo', "" => "empty", 0 => "zero", FALSE => "false"); var_dump($arr);
Output for 4.3.2 - 5.6.23, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [""]=> string(5) "empty" [0]=> string(5) "false" }
Output for 4.3.0 - 4.3.1
array(2) { [""]=> string(5) "empty" [0]=> string(4) "zero" }