《PHP應用：php usort 使用用戶自定義的比較函數(shù)對二維數(shù)組中的值進行排序》要點：
本文介紹了PHP應用：php usort 使用用戶自定義的比較函數(shù)對二維數(shù)組中的值進行排序，希望對您有用。如果有疑問，可以聯(lián)系我們。
今天發(fā)現(xiàn)一個很好用二維數(shù)組排序的php方法,usort,推薦給大家,以后二維數(shù)組里面,要按照一個字段的值排序用這個方法簡單高效,例如下面的數(shù)組：PHP實戰(zhàn)
[guess_subject] => Array
(
[0] => Array
(
[subject_id] => 4587
[game_id] => 9228
[parent_category_id] => 78
[subject_title] => 全場比賽兩隊總得分之和是
[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] => 本場比賽是否有加時賽
[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] => 第二節(jié)兩隊總得分之和是
[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] => 第三節(jié)兩隊總得分之和是
[subject_date_time] => 1490668200
[status] => 2
[subject_answer] => 0
[totle_join] => 0
[max_nickname] =>
[max_currency] =>
)
)
要按照status字段的升序排列的話,只需要這樣寫PHP實戰(zhàn)
foreach($data as $key => &$value) {
// 按照status的升序排序,使用用戶自定義的比較函數(shù)對數(shù)組中的值進行排序,
// 本函數(shù)將用用戶自定義的比較函數(shù)對一個數(shù)組中的值進行排序. 如果要排序的數(shù)組需要用一種不尋常的標準進行排序,那么應該使用此函數(shù).
// 在第一個參數(shù)小于,等于或大于第二個參數(shù)時,該比較函數(shù)必須相應地返回一個小于,等于或大于 0 的整數(shù).
usort($value['guess_subject'], function($a, $b){
if ($a['status'] == $b['status'])
return 0;
return ($a['status'] < $b['status']) ? -1 : 1;
});
}
return $data;
就會按照status的 升序排列啦, status=1 的數(shù)組單元會排在前面PHP實戰(zhàn)
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