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run code in 150+ php & hhvm versions
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<?php $ary = array(1, 3, 5, null, 9, 10); print_r($ary);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 3 [2] => 5 [3] => [4] => 9 [5] => 10 )