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run code in 200+ php & hhvm versions
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<?php $arr=array('0_1','0_3','1_2','1_1','4_1'); $newArray = []; foreach ($arr as $item) { $items = explode('_', $item); $newArray[$items[0]][$items[1]] = $item; } var_dump($newArray); exit();
Output for 5.5.0 - 7.3.0rc3
array(3) { [0]=> array(2) { [1]=> string(3) "0_1" [3]=> string(3) "0_3" } [1]=> array(2) { [2]=> string(3) "1_2" [1]=> string(3) "1_1" } [4]=> array(1) { [1]=> string(3) "4_1" } }