Question

I need to sort an array that has this form :

Array
(
    [18] => 9
    [14] => 4
    [53] => 9
    [10749] => 4
    [28] => 9
    [12] => 6
    [878] => 7
    [35] => 8
    [10769] => 1
    [9648] => 1
    [10751] => 1
    [27] => 1
    [80] => 3
)

The arsort function gives me :

Array
(
    [53] => 9
    [28] => 9
    [18] => 9
    [35] => 8
    [878] => 7
    [12] => 6
    [14] => 4
    [10749] => 4
    [80] => 3
    [27] => 1
    [10769] => 1
    [9648] => 1
    [10751] => 1
)

That’s good but the thing is that when values are the same I would like to get them sorted by their keys, is that possible ? so i would get :

Array
(
    [18] => 9
    [28] => 9
    [53] => 9
    [35] => 8
    [878] => 7
    [12] => 6
    [14] => 4
    [10749] => 4
    [80] => 3
    [27] => 1
    [9648] => 1
    [10751] => 1
    [10769] => 1
)

Can anybody tell me how to do this?

Answer 1

here’s a solution using php functions instead of the very slow bubblesort

    

$arr = array(
    '18'    => 9,
    '14'    => 4,
    '53'    => 9,
    '10749' => 4,
    '28'    => 9,
    '12'    => 6,
    '878'   => 7,
    '35'    => 8,
    '10769' => 1,
    '9648'  => 1,
    '10751' => 1,
    '27'    => 1,
    '80'    => 3
    );

print_r($arr);

arsort( $arr );
print_r($arr);


$last = null;
$tmp = array();
$result = array();
foreach( $arr as $k => $v ) {
    if ( $last && $v != $last ) {
        krsort($tmp);

        foreach ( $tmp as $kt => $vt ) {
            $result[ $kt ] = $vt;
        }

        $tmp = array();
    }
    $tmp[$k] = $v;

    $last = $v;
}

krsort($tmp);

foreach ( $tmp as $kt => $vt ) {
    $result[ $kt ] = $vt;
}

print_r($result);