今天發(fā)現(xiàn)一個(gè)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(gè)字段的值排序用這個(gè)方法簡(jiǎn)單高效，例如下面的數(shù)組：
[guess_subject] => Array
(
[0] => Array
(
[subject_id] => 4587
[game_id] => 9228
[parent_category_id] => 78
[subject_title] => 全場(chǎng)比賽兩隊(duì)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(chǎng)比賽是否有加時(shí)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(duì)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(duì)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(huà)，只需要這樣寫(xiě)
foreach($data as $key => &$value) {
// 按照status的升序排序,使用用戶(hù)自定義的比較函數(shù)對(duì)數(shù)組中的值進(jìn)行排序,
// 本函數(shù)將用用戶(hù)自定義的比較函數(shù)對(duì)一個(gè)數(shù)組中的值進(jìn)行排序。 如果要排序的數(shù)組需要用一種不尋常的標(biāo)準(zhǔn)進(jìn)行排序，那么應(yīng)該使用此函數(shù)。
// 在第一個(gè)參數(shù)小于，等于或大于第二個(gè)參數(shù)時(shí)，該比較函數(shù)必須相應(yīng)地返回一個(gè)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(huì)按照status的 升序排列啦， status=1 的數(shù)組單元會(huì)排在前面
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