Question

I have an array like this:

[1303] => Array
(
    [Name]  => Al****
    [Total] => 479896.025
)
[13047] => Array
(
    [Name]  => An****
    [Total] => 1999.871
)
[13065] => Array
(
    [Name]  => Ao****
    [Total] => 3947.761
)
[13054] => Array
(
    [Name]  => Ba****
    [Total] => 15666.826
)
[13020] => Array
(
    [Name]  => Bb****
    [Total] => 22366.6456
)
[13016] => Array
(
    [Name]  => Be****
    [Total] => 8307.389
)

The array is sorted by name. I need to assign rank to each array item based on total. In the above example, item 1303 should have the rank 1, item 13020 should have a rank of 2 and so on; the array must maintain its existing sorting. What is the simplest way to do this. Expected output:

[1303] => Array
(
    [Name]  => Al****
    [Total] => 479896.025
    [Rank]  => 1
)
[13047] => Array
(
    [Name]  => An****
    [Total] => 1999.871
    [Rank]  => 6
)
[13065] => Array
(
    [Name]  => Ao****
    [Total] => 3947.761
    [Rank]  => 5
)
[13054] => Array
(
    [Name]  => Ba****
    [Total] => 15666.826
    [Rank]  => 3
)
[13020] => Array
(
    [Name]  => Bb****
    [Total] => 22366.6456
    [Rank]  => 2
)
[13016] => Array
(
    [Name]  => Be****
    [Total] => 8307.389
    [Rank]  => 4
)

Answer 1

Sort the array using the Total value:

function totalSort($a, $b) {
    if ($a['Total'] > $b['Total']) {
        return -1;
    } else if ($a['Total'] < $b['Total']) {
        return 1;
    } else {
        return 0;
    }
}

uasort($array, 'totalSort');

Add the Rank elements:

$i = 1;
foreach ($array as &$element) {
    $element['Rank'] = $i++;
}

Sort the array by Name again (if required):

function nameSort($a, $b) {
    if ($a['Name'] > $b['Name']) {
        return -1;
    } else if ($a['Name'] < $b['Name']) {
        return 1;
    } else {
        return 0;
    }
}

uasort($array, 'nameSort');