usort sorting multiple fields

Question

Is it possible to use usort to sort multiple fields in a multidimensional array? For example, I want to sort name alphabetically and then from thos

Answer 1

usort($arr, function($a, $b)
{
    $name = strcmp($a['name'], $b['name']);
    if($name === 0)
    {
        return $a['age'] - $b['age'];
    }
    return $name;
});