php usort 使用用户自定义的比较函数对二维数组中的值进行排序

[guess_subject] => Array    (      [0] => Array        (          [subject_id] => 4587          [game_id] => 9228          [parent_category_id] => 78          [subject_title] => 全场比赛两队总得分之和是          [subject_date_time] => 1490668200          [status] => 2          [subject_answer] => 0          [totle_join] => 0          [max_nickname] =>           [max_currency] =>         )       [1] => Array        (          [subject_id] => 4588          [game_id] => 9228          [parent_category_id] => 78          [subject_title] => 本场比赛是否有加时赛          [subject_date_time] => 1490668200          [status] => 2          [subject_answer] => 0          [totle_join] => 0          [max_nickname] =>           [max_currency] =>                     )       [2] => Array        (          [subject_id] => 4584          [game_id] => 9228          [parent_category_id] => 78          [subject_title] => 第二节两队总得分之和是          [subject_date_time] => 1490668200          [status] => 1          [subject_answer] => 0          [totle_join] => 0          [max_nickname] =>           [max_currency] =>         )       [3] => Array        (          [subject_id] => 4585          [game_id] => 9228          [parent_category_id] => 78          [subject_title] => 第三节两队总得分之和是          [subject_date_time] => 1490668200          [status] => 2          [subject_answer] => 0          [totle_join] => 0          [max_nickname] =>           [max_currency] =>          )    )

 foreach($data as $key => &$value) {      // 按照status的升序排序,使用用户自定义的比较函数对数组中的值进行排序,      // 本函数将用用户自定义的比较函数对一个数组中的值进行排序。 如果要排序的数组需要用一种不寻常的标准进行排序，那么应该使用此函数。      // 在第一个参数小于，等于或大于第二个参数时，该比较函数必须相应地返回一个小于，等于或大于 0 的整数。      usort($value['guess_subject'], function($a, $b){        if ($a['status'] == $b['status'])          return 0;        return ($a['status'] < $b['status']) ? -1 : 1;      });          }    return $data;