php二维数组排序

$users = array(

    array('name' => 'tom', 'age' => 20)

    , array('name' => 'anny', 'age' => 18)

    , array('name' => 'jack', 'age' => 22)

);

$ages = array();

foreach ($users as $user) {

    $ages[] = $user['age'];

}

array_multisort($ages, SORT_ASC, $users);

或者DESC