PHP function array_multisort() to sort multiple arrays or multidimensional arrays

Example

Returns an array in ascending order:

<?php
$a=array("Dog","Cat","Horse","Bear","Zebra");
array_multisort($a);
print_r($a);
?>

Definition and usage

array_multisort() function returns a sorted array. You can enter one or more arrays. The function sorts the first array first, then the other arrays, and if two or more values ​​are the same, it sorts the next array.

Notes: StringKey names will be preserved, but numeric key names will be re-indexed, starting at 0 and increasing by 1.

Note: You can set the sort order and sort type parameters after each array. If not set, each array parameter will use its default value .

Syntax

array_multisort(array1,sorting order,sorting type,array2,array3...)

Parameters	Description
array1	Required. Specifies an array.
sorting order	Optional. Specify the order of sorting. Possible values: SORT_ASC - Default. Sort in ascending order (A-Z). SORT_DESC - Sort in descending order (Z-A).
sorting type	Optional. Specifies the sorting type. Possible values: SORT_REGULAR - Default. Put each item in regular order (Standard ASCII, don't change the type). SORT_NUMERIC - Treat each item as a number. SORT_STRING - Treat each item as a string. SORT_LOCALE_STRING - Treats each item as a string, based on the current locale (can be changed via setlocale() ). SORT_NATURAL - Treat each item as a string, using natural sorting like natsort() . SORT_FLAG_CASE - Can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings, case-insensitively.
array2	Optional. Specifies an array.
array3	Optional. Specifies an array.

技术细节

返回值：	如果成功则返回 TRUE，如果失败则返回 FALSE。
PHP 版本：	4+
更新日志：	排序类型 SORT_NATURAL 和 SORT_FLAG_CASE 是在 PHP 5.4 中新增的。 排序类型 SORT_LOCALE_STRING 是在 PHP 5.3 中新增的。

更多实例

实例 1

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);
?>

实例 2

当两个值相同时如何排序：

<?php
$a1=array("Dog","Dog","Cat");
$a2=array("Pluto","Fido","Missy");
array_multisort($a1,$a2);
print_r($a1);
print_r($a2);
?>

实例 3

使用排序参数：

<?php
$a1=array("Dog","Dog","Cat");
$a2=array("Pluto","Fido","Missy");
array_multisort($a1,SORT_ASC,$a2,SORT_DESC);
print_r($a1);
print_r($a2);
?>

实例 4

合并两个数组，并按数字降序排列：

<?php
$a1=array(1,30,15,7,25);
$a2=array(4,30,20,41,66);
$num=array_merge($a1,$a2);
array_multisort($num,SORT_DESC,SORT_NUMERIC);
print_r($num);
?>

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