PHP: Sort multidimensional array, but keep its substructure - php

Question

I have a multidimensional arrays with the following structure:
$arr[0][0] = 1.24;
$arr[0][1] = 5.21;
$arr[0][2] = 2.72;
$arr[0][3] = 1.89;
$arr[0][4] = 4.62;
$arr[1][0] = 3.45;
$arr[1][1] = 5.61;
$arr[1][2] = 2.62;
$arr[1][3] = 1.12;
$arr[1][4] = 1.35;
This array should get sorted while keeping the suborder of $arr[0] and $arr[1], so the result looks like this:
$arr[0][0] = 1.24;
$arr[1][0] = 3.45;
$arr[0][1] = 5.21;
$arr[0][2] = 2.72;
$arr[0][3] = 1.89;
$arr[0][4] = 4.62;
$arr[1][2] = 2.62;
$arr[1][3] = 1.12;
$arr[1][4] = 1.35;
$arr[1][1] = 5.61;
I do not care in which form the result get saved, but I need both keys and the value. Hope you understand and can help me.

Answer 1

How about looping the outer array and sorting the inner?
foreach ($arr as $id => $data) {
sort($data);
$arr[$id] = $data;
}

Answer 2

$arr[0][0] = 1.24;
$arr[0][1] = 5.21;
$arr[0][2] = 2.72;
$arr[0][3] = 1.89;
$arr[0][4] = 4.62;
$arr[1][0] = 3.45;
$arr[1][1] = 5.61;
$arr[1][2] = 2.62;
$arr[1][3] = 1.12;
$arr[1][4] = 1.35;
$size = count($arr);
$outArr= array();
foreach($arr[0] as $key =>$value)
{
$resArr = array();
for($i = 0 ; $i< $size ; $i++)
{
$resArr[] = $arr[$i][$key] ;
}
sort($resArr);
$outArr[$key] = $resArr;
}
echo "<pre>";
print_r($outArr);
Check if this is a closer solution.