<?php

$users = [
    ['name' => 'Charlie', 'age' => 30],
    ['name' => 'Alice', 'age' => 25],
    ['name' => 'Bob', 'age' => 35]
];

// Sort users by age in ascending order
uasort($users, function($a, $b) {
    return $a['age'] <=> $b['age'];
});

print_r($users);
/* Output:
Array
(
    [1] => Array
        (
            [name] => Alice
            [age] => 25
        )

    [0] => Array
        (
            [name] => Charlie
            [age] => 30
        )

    [2] => Array
        (
            [name] => Bob
            [age] => 35
        )

)
*/

// Sort users by name in ascending order (case-insensitive)
uasort($users, function($a, $b) {
    return strcasecmp($a['name'], $b['name']);
});

print_r($users);
/* Output:
Array
(
    [1] => Array
        (
            [name] => Alice
            [age] => 25
        )

    [2] => Array
        (
            [name] => Bob
            [age] => 35
        )

    [0] => Array
        (
            [name] => Charlie
            [age] => 30
        )

)
*/

?>