二维数组里，根据数组字段为条件，进行总体排序(二维排序)

1 <?php
 2 /**
 3  * 二维数组根据某个字段排序
 4  * 功能：按照用户的年龄倒序排序
 5  * @author ruxing.li
 6  */
 7 header(‘Content-Type:text/html;Charset=utf-8‘);
 8 $arrUsers = array(
 9     array(
10             ‘id‘   => 1,
11             ‘name‘ => ‘张三‘,
12             ‘age‘  => 25,
13     ),
14     array(
15             ‘id‘   => 2,
16             ‘name‘ => ‘李四‘,
17             ‘age‘  => 23,
18     ),
19     array(
20             ‘id‘   => 3,
21             ‘name‘ => ‘王五‘,
22             ‘age‘  => 40,
23     ),
24     array(
25             ‘id‘   => 4,
26             ‘name‘ => ‘赵六‘,
27             ‘age‘  => 31,
28     ),
29     array(
30             ‘id‘   => 5,
31             ‘name‘ => ‘黄七‘,
32             ‘age‘  => 20,
33     ),
34 ); 
35 
36 
37 $sort = array(
38         ‘direction‘ => ‘SORT_DESC‘, //排序顺序标志 SORT_DESC 降序；SORT_ASC 升序
39         ‘field‘     => ‘age‘,       //排序字段
40 );
41 $arrSort = array();
42 foreach($arrUsers AS $uniqid => $row){
43     foreach($row AS $key=>$value){
44         $arrSort[$key][$uniqid] = $value;
45     }
46 }
47 if($sort[‘direction‘]){
48     array_multisort($arrSort[$sort[‘field‘]], constant($sort[‘direction‘]), $arrUsers);
49 }
50 
51 var_dump($arrUsers);
52 
53 /*
54 输出结果：
55 
56 array (size=5)
57   0 => 
58     array (size=3)
59       ‘id‘ => int 5
60       ‘name‘ => string ‘黄七‘ (length=6)
61       ‘age‘ => int 20
62   1 => 
63     array (size=3)
64       ‘id‘ => int 2
65       ‘name‘ => string ‘李四‘ (length=6)
66       ‘age‘ => int 23
67   2 => 
68     array (size=3)
69       ‘id‘ => int 1
70       ‘name‘ => string ‘张三‘ (length=6)
71       ‘age‘ => int 25
72   3 => 
73     array (size=3)
74       ‘id‘ => int 4
75       ‘name‘ => string ‘赵六‘ (length=6)
76       ‘age‘ => int 31
77   4 => 
78     array (size=3)
79       ‘id‘ => int 3
80       ‘name‘ => string ‘王五‘ (length=6)
81       ‘age‘ => int 40
82 
83 */