php 多维数组排序,根据某一列排序(array_multisort()和array_column()联用)

array_multisort()和array_column()联用效果直接叠满,1+1>100

先来看下两个函数的介绍和用法

array_column():

 一般模式,不需要其中字段作为id,只需要提取val值

<?php
// 可能从数据库中返回数组
$a = [
      [
          'id' => 5698,    	
          'first_name' => 'Peter',    
          'last_name' => 'Griffin',  
	  ],  
      [    
          'id' => 4767,    
          'first_name' => 'Ben', 
          'last_name' => 'Smith',  
      [    
          'id' => 3809,    
	      'first_name' => 'Joe',   
          'last_name' => 'Doe',];
$last_names = array_column($a,'last_name');
print_r($last_names);

//最简单模式
/*
Array(  [0] => Griffin  
	[1] => Smith  [2] => Doe
)
*/
?>

 升级模式,需要其中字段作为id,另一字段作为val值

<?php
// 可能从数据库中返回数组
$a = [
      [
          'id' => 5698,'last_name','id');
print_r($last_names);

//id作为key,last_name作为val
/*
Array(  [5698] => Griffin  
	[4767] => Smith  [3809] => Doe)
*/

 array_multisort():

 返回一个升序排列的数组：

<?php
$a1=array("Dog","Cat");
$a2=array("Fido","Missy");
array_multisort($a1,$a2);
print_r($a1);
print_r($a2);
/*返回结果
Array ( [0] => Cat [1] => Dog ) Array ( [0] => Missy [1] => Fido )
*/
?>

当两个值相同时如何排序：

<?php
$a1=array("Dog","Dog","Cat");
$a2=array("Pluto","Fido",$a2);
print_r($a1);
print_r($a2);
/*返回结果
Array ( 
[0] => Cat 
[1] => Dog 
[2] => Dog 
) 
Array ( 
[0] => Missy 
[1] => 
Fido [2] => Pluto 
)
*/
?>

使用排序参数：

<?php
$a1=array("Dog",SORT_ASC,$a2,SORT_DESC);
print_r($a1);
print_r($a2);
/*返回结果
Array ( 
[0] => Cat 
[1] => Dog 
[2] => Dog 
) 
Array ( 
[0] => Missy 
[1] => Pluto
[2] => Fido 
)
*/
?>

合并两个数组，并按数字降序排列：

<?php
$a1=array(1,30,15,7,25);
$a2=array(4,20,41,66);
$num=array_merge($a1,$a2);
array_multisort($num,SORT_DESC,SORT_NUMERIC);
print_r($num);
/*返回结果
Array ( 
[0] => 66 
[1] => 41
[2] => 30 
[3] => 30 
[4] => 25 
[5] => 20 
[6] => 15
[7] => 7 
[8] => 4 
[9] => 1 
)
*/
?>

以上是对两个函数的介绍和使用方法举例

下面开始合体进化,直接直呼我滴个*:

首先扩展下array_multisort(),如果对多个数组进行排序，排序结果是所有的数组都按第一个数组的顺序进行排列

<?php
$a1 = ['c','b','a'];
$a2 = ['b','c','a'];
$a3 = ['b','a','c'];
 
array_multisort($a1,$a3);
print_r($a1);print_r('<br>');
print_r($a2);print_r('<br>');
print_r($a3);print_r('<br>');
/*输出结果
Array ( [0] => a [1] => b [2] => c )
Array ( [0] => a [1] => c [2] => b )
Array ( [0] => c [1] => a [2] => b )
*/
?>

然后开始合体:

1.将多维数组按照某一列的字段来进行排序

<?php
$data[] = array('volume' => 67,'id' => 2);
$data[] = array('volume' => 86,'id' => 1);
$data[] = array('volume' => 86,'id' => 3);
$data[] = array('volume' => 85,'id' => 6);
$data[] = array('volume' => 98,'id' => 6);
$data[] = array('volume' => 67,'id' => 7);

array_multisort(array_column($data,'volume'),$data);//按volume倒序排

/*输出结果
array(7) { 
[0]=> array(2) { 
["volume"]=> int(98) ["id"]=> int(2) 
} 
[1]=> array(2) {
 ["volume"]=> int(86) ["id"]=> int(1)
} 
[2]=> array(2) { 
["volume"]=> int(86) ["id"]=> int(3)
 } 
[3]=> array(2) {
 ["volume"]=> int(86) ["id"]=> int(6)
 } 
[4]=> array(2) {
 ["volume"]=> int(85) ["id"]=> int(6) 
} 
[5]=> array(2) {
 ["volume"]=> int(67) ["id"]=> int(2)
 } 
[6]=> array(2) { 
["volume"]=> int(67) ["id"]=> int(7) 
} 
}
*/
?>

2.按volume倒序排，volume相同时，按id正序排

<?php
$data[] = array('volume' => 67,array_column($data,'id'),$data);//按volume倒序排，volume相同时，按id正序排

/*输出结果
array(7) { 
[0]=> array(2) 
{ 
["volume"]=> int(98) ["id"]=> int(2) 
} 
[1]=> array(2) {
 ["volume"]=> int(86) ["id"]=> int(1) 
} 
[2]=> array(2) { 
["volume"]=> int(86) ["id"]=> int(3)
 } 
[3]=> array(2) { 
["volume"]=> int(86) ["id"]=> int(6) 
} 
[4]=> array(2) {
 ["volume"]=> int(85) ["id"]=> int(6) 
} 
[5]=> array(2) { 
 ["volume"]=> int(67) ["id"]=> int(2) 
} 
[6]=> array(2) { 
 ["volume"]=> int(67) ["id"]=> int(7) 
} 
}
*/
?>

3.按照年龄从大到小的顺序排列，如果年龄相同就按照名字升序排序

<?php
 $array = [
    ["age" => 20,"name" => "a"],["age" => 21,"name" => "d"],["age" => 22,"name" => "e"],["age" => 20,"name" => "b"],["age" => 25,"name" => "c"]
 ];
 array_multisort(array_column($array,'age'),SORT_NUMERIC,array_column($array,'name'),SORT_STRING,$array);
print_r($array);
/*返回结果
Array
(
    [0] => Array
        (
            [age] => 25
            [name] => c
        )
    [1] => Array
        (
            [age] => 22
            [name] => e
        )
    [2] => Array
        (
            [age] => 21
            [name] => d
        )
    [3] => Array
        (
            [age] => 20
            [name] => a
        )
    [4] => Array
        (
            [age] => 20
            [name] => b
        )
)
*/
?>

到此撒花.