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run code in 150+ php & hhvm versions
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<?php $arr = array(NULL => 'foo', "" => "Bar", 0 => "XYZ"); var_dump($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [""]=> string(3) "Bar" [0]=> string(3) "XYZ" }