Answers for "php array sort by multiple keys"

sort multidimensional array php by key

$people= array(
    array("age"=>54,"first_name"=>"bob","last_name"=>"Dillion"),
    array("age"=>22,"first_name"=>"darah","last_name"=>"Harvard"),
    array("age"=>31,"first_name"=>"ahuck","last_name"=>"Bartowski"),
);

echo '<PRE>';
print_r($people);


$keys = array_column($people, 'first_name');
print_r($keys);

array_multisort($keys, SORT_ASC, $people);

print_r($people);

php sort multidimensional array by key

function buildSorter($key) {
    return function ($a, $b) use ($key) {
        return strnatcmp($a[$key], $b[$key]);
    };
}

usort($array, buildSorter('key_b'));