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run code in 150+ php & hhvm versions
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<?php $array; $array[null] = 'data'; var_dump($array);
Output for 5.1.0 - 5.6.28, 7.0.0 - 7.1.0
array(1) { [""]=> string(4) "data" }
Output for 5.0.4 - 5.0.5, hhvm-3.10.0 - 3.12.0
Notice: Undefined variable: array in /in/HCje0 on line 2 array(1) { [""]=> string(4) "data" }
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: array in /in/HCje0 on line 2 array(1) { [""]=> string(4) "data" }