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<?php $arr1 = [ [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], ]; $arr2 = [ [1, 2, 3, 4], [1, 2, 3, 4], ]; $arr3 = [ [1, 2, 3, 4] ]; $arr = array_merge($arr1, $arr2, $arr3); $res = [ array_sum(array_column($arr, 0)), array_sum(array_column($arr, 1)), array_sum(array_column($arr, 2)), array_sum(array_column($arr, 3)) ]; print_r($res);
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