PHP二维数组根据某个键名排序

$result = array(
　　　　array(
           "amount": "11.00",
           "date": "2015.10.10",
           "title": "缴纳会员费"
       ),

　　　　array(
           "amount": "11.00",
           "date": "2016.10.10",
           "title": "缴纳会员费"
       )
　　);
$sort = array(
    'direction' => 'SORT_DESC', //排序顺序标志 SORT_DESC 降序；SORT_ASC 升序
    'field'     => 'date',       //排序字段
);
$arrSort = array();
foreach($result AS $keys=> $row){
    foreach($row AS $key=>$value){
        $arrSort[$key][$keys] = $value;
    }
}
if($sort['direction']){
    array_multisort($arrSort[$sort['field']], constant($sort['direction']), $result);
}
print_r($result);