How to have a stable sort in PHP with arsort()?

Question

i need to sort an array in php based on value, array use some numbers for keys and values, for example like this:

$a = array(70 => 1 ,82          


        

Answer 1

Simple solution with array_multisort.

$assoc = [
    70 => 1,
    82 => 5,
    61 => 3,
    55 => 1,
    34 => 2,
    53 => 2,
    21 => 4,
    13 => 5,
];

$keys = array_keys($assoc);
array_multisort($assoc, SORT_DESC, range(1, count($assoc)), $keys);
$assoc = array_combine($keys, $assoc);

print_r($assoc);