PHP callback usort by multiple properties

sort_by_properties.php

<?php

class User
{
    public function __construct(
        public string $id,
        public int $score
    ) {
    }
}

// sort by score, then by id
$users = [
    new User('c', 3),
    new User('e', 1),
    new User('a', 1),
    new User('b', 1),
];

uasort($users, function ($a, $b) {
   return $a->score <=> $b->score ?: $a->id <=> $b->id;
});

foreach ($users as $user) {
    echo sprintf("%s(%d)", $user->id, $user->score) . PHP_EOL;
}