How to merge two arrays

Question

I'm trying to merge two similar arrays with the same keys

Array
(
    [0] => 4064628
    [1] => 4064953
    [2] => 4064922
    [3] => 4064870
    [4] => 4064789
    [5] => 4064631
    [6] => 4065044
    [7] => 4064942
    [8] => 4064938
    [9] => 4064936
)
Array
(
    [0] => 165020
    [1] => 165026
    [2] => 165025
    [3] => 165023
    [4] => 165024
    [5] => 165021
    [6] => 165027
    [7] => 165043
    [8] => 165042
    [9] => 165045
)

But when I use array_merge or array_merge_recursive the output is the same:

Array
(
    [0] => 4064628
    [1] => 4064953
    [2] => 4064922
    [3] => 4064870
    [4] => 4064789
    [5] => 4064631
    [6] => 4065044
    [7] => 4064942
    [8] => 4064938
    [9] => 4064936
    [10] => 165020
    [11] => 165026
    [12] => 165025
    [13] => 165023
    [14] => 165024
    [15] => 165021
    [16] => 165027
    [17] => 165043
    [18] => 165042
    [19] => 165045
)

But I want a result like this:

Array
(
    [0] => Array
        (
            [0] => 4064628
            [1] => 165020
        )

    [1] => Array
        (
            [0] => 4064935
            [1] => 165026
        )

    [2] => Array
        (
            [0] => 4064922
            [1] => 165025
        )
     .......

Can anyone help merge these two arrays? This seems simple but there's something I don't understand and I don't know what it is

Answer 1

$arr=[];
for ($i=0;$i<count($arr1);$i++){
    array_push($arr, [$arr1[$i], $arr2[$i]]);
}

Answer 2

$output_arr=[];
foreach ($array1 as $key => $value) {
$output_arr[]=[$value,$array2[$key]];}