What are some potential pitfalls when using arsort() in PHP to sort arrays by highest sum?

One potential pitfall when using arsort() in PHP to sort arrays by highest sum is that it only sorts the values in descending order, not the keys. To sort both keys and values by the sum of the values, you can use array_multisort() with a custom comparison function. 

$array = ['a' => 10, 'b' => 5, 'c' => 15];

uasort($array, function($a, $b) {
    return array_sum($b) - array_sum($a);
});

print_r($array);

Keywords

arsort PHP arrays sorting sum

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