dvdty su sorting

<?php

$arr = [
    ['name' => "evelin", 'age' => 10],
    ['name' => "eve", 'age' => 10],
    ['name' => "don", 'age' => 100],
    ['name' => "gim", 'age' => 100],
    ['name' => "alex", 'age' => 1000],
    ['name' => "alec", 'age' => 1000],
];

$age = [];

foreach ($arr as $key => $row)
{
    $age[$key] = $row['age'];
}

array_multisort($age, SORT_DESC, $arr);

var_dump($arr);