PHP 二維數組根據某個欄位排序

標籤：

要求：從兩個不同的表中擷取各自的4條資料，然後整合(array_merge)成一個數組，再根據資料的建立時間降序排序取前4條。

遇到這個要求的時候就不是 ORDER BY 能解決的問題了。因此翻看 PHP 手冊尋找到了如下方法，做此筆記。

<?php/** * 二維數組根據某個欄位排序 * 功能：按照使用者的年齡倒序排序 * @author ruxing.li */header(‘Content-Type:text/html;Charset=utf-8‘);$arrUsers = array(    array(            ‘id‘   => 1,            ‘name‘ => ‘張三‘,            ‘age‘  => 25,    ),    array(            ‘id‘   => 2,            ‘name‘ => ‘李四‘,            ‘age‘  => 23,    ),    array(            ‘id‘   => 3,            ‘name‘ => ‘王五‘,            ‘age‘  => 40,    ),    array(            ‘id‘   => 4,            ‘name‘ => ‘趙六‘,            ‘age‘  => 31,    ),    array(            ‘id‘   => 5,            ‘name‘ => ‘黃七‘,            ‘age‘  => 20,    ),); $sort = array(        ‘direction‘ => ‘SORT_DESC‘, //排序次序標誌 SORT_DESC 降序；SORT_ASC 升序        ‘field‘     => ‘age‘,       //排序欄位);$arrSort = array();foreach($arrUsers AS $uniqid => $row){    foreach($row AS $key=>$value){        $arrSort[$key][$uniqid] = $value;    }}if($sort[‘direction‘]){    array_multisort($arrSort[$sort[‘field‘]], constant($sort[‘direction‘]), $arrUsers);}var_dump($arrUsers);/*輸出結果：array (size=5)  0 =>     array (size=3)      ‘id‘ => int 5      ‘name‘ => string ‘黃七‘ (length=6)      ‘age‘ => int 20  1 =>     array (size=3)      ‘id‘ => int 2      ‘name‘ => string ‘李四‘ (length=6)      ‘age‘ => int 23  2 =>     array (size=3)      ‘id‘ => int 1      ‘name‘ => string ‘張三‘ (length=6)      ‘age‘ => int 25  3 =>     array (size=3)      ‘id‘ => int 4      ‘name‘ => string ‘趙六‘ (length=6)      ‘age‘ => int 31  4 =>     array (size=3)      ‘id‘ => int 3      ‘name‘ => string ‘王五‘ (length=6)      ‘age‘ => int 40*/

 

PHP 二維數組根據某個欄位排序