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run code in 150+ php & hhvm versions
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<?php $arr = array(-1, -3, 0, 2, 4, -4); print_r($arr); ?>
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] => 0 [3] => 2 [4] => 4 [5] => -4 )