PHP Array Sorting

数组中的元素能够以字母或数字顺序进行升序或降序排序。

PHP - 数组的排序函数

在本节中，我们将学习如下 PHP 数组排序函数：

  • sort() - 以升序对数组排序
  • rsort() - 以降序对数组排序
  • asort() - 根据值，以升序对关联数组进行排序
  • ksort() - 根据键，以升序对关联数组进行排序
  • arsort() - 根据值，以降序对关联数组进行排序
  • krsort() - 根据键，以降序对关联数组进行排序

对数组进行升序排序 - sort()

下面的例子按照字母升序对数组 $cars 中的元素进行排序：

Example

<?php
$cars=array("porsche","BMW","Volvo");
sort($cars);
?>

Run instance

The following example sorts the elements of the array $numbers in ascending order by number:

Example

<?php
$numbers=array(3,5,1,22,11);
sort($numbers);
?>

Run instance

Sort the array in descending order - rsort()

The following example sorts the elements of the array $cars in descending order by letter:

Example

<?php
$cars=array("porsche","BMW","Volvo");
rsort($cars);
?>

Run instance

The following example sorts the elements of the array $numbers in descending order by number:

Example

<?php
$numbers=array(3,5,1,22,11);
rsort($numbers);
?>

Run instance

Sort the array by value in ascending order - asort()

The following example sorts the associated array in ascending order by value:

Example

<?php
$age=array("Bill"=>"63","Steve"=>"56","Elon"=>"47");
asort($age);
?>

Run instance

Sort the array by key in ascending order - ksort()

The following example sorts the associated array in ascending order by key:

Example

<?php
$age=array("Bill"=>"63","Steve"=>"56","Elon"=>"47");
ksort($age);
?>

Run instance

Sort the array by value in descending order - arsort()

The following example sorts the associated array in descending order by value:

Example

<?php
$age=array("Bill"=>"63","Steve"=>"56","Elon"=>"47");
arsort($age);
?>

Run instance

Sort the array by key in descending order - krsort()

The following example sorts the associated array in descending order by key:

Example

<?php
$age=array("Bill"=>"63","Steve"=>"56","Elon"=>"47");
krsort($age);
?>

Run instance

Complete PHP Array Reference Manual

For a complete reference manual of array functions, please visit our PHP Array Reference Manual.

This reference manual includes a brief description and usage examples for each function.