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run code in 150+ php & hhvm versions
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<?php $array = array(NULL => 1, 'BLA' => 3); print_r($array); $array[NULL] = 2; print_r($array);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [] => 1 [BLA] => 3 ) Array ( [] => 2 [BLA] => 3 )