Ben 2 diziler var

$arr1 = Array
(
    [0] => 12
    [1] => 4
    [2] => 8
    [3] => xx
    [4] => 1
    [5] => 1year
    [6] => 7
)
$arr2 = Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
)

I want to create a new array with the values of a2 as keys in $arr1. My resultant array should be like this

$arr3 = Array
(
    [1] => 12
    [2] => 4
    [3] => 8
    [4] => xx
    [5] => 1
    [6] => 1year
    [7] => 7
)