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run code in 300+ PHP versions simultaneously
<?php $arr1 = [1 => 19, 2 => 2, 3 => 2018]; $arr2 = [1 => 19, 2 => 1, 3 => 2017]; $arr3 = [1 => 18, 2 => 2, 3 => 2016]; $mynewArray = [$arr1,$arr2,$arr3]; print_r($mynewArray);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [1] => 19 [2] => 2 [3] => 2018 ) [1] => Array ( [1] => 19 [2] => 1 [3] => 2017 ) [2] => Array ( [1] => 18 [2] => 2 [3] => 2016 ) )

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