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run code in 150+ php & hhvm versions
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<?php $arr=array(); array_push($arr, array(1)); array_push($arr, array(2)); print_r($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => 1 ) [1] => Array ( [0] => 2 ) )