PHP应用：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;