PHP二维关联数组的对某一个值排序

$arr=array(
    [0] =Array
        (
            [id] =169,
            [sorts] =4,
            [fans] = 0,      
            [created_at] =1413621597
        )
    [1] =Array
        (
            [id] =170,
            [sorts] =5,
            [fans] = 5,      
            [created_at] =1418621597
        )
    [2] =Array
        (
            [id] =171,
            [sorts] =1,
            [fans] = 9,      
            [created_at] =1413621597
        )
)

第一个参数 ：数组（必填，后面参数可选）
第二个参数：排序方式  SORT_ASC默认升序，SORT_DESC 降序
第三个参数：SORT_REGULAR默认将每一项按常规顺序排列，SORT_NUMERIC按数字顺序，SORT_STRING按字母顺序

第四个是外层数组$arr

foreach ($arr as $key => $value) {
    $temp[$key]=$value['sorts'];
}
array_multisort($temp,SORT_ASC,$arr);
print_r($arr);