How to sort an array from large to small in php

3 methods: 1. Use rsort() to sort the array in descending order, the syntax is "rsort(array);"; 2. Use arsort(), the syntax is "arsort(array)", which can be based on the array key The values ​​are sorted in descending order; 3. Use krsort(), the syntax "krsort (array)", to sort in descending order according to the key name.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

The arrays are sorted from large to small, that is, the Sort the array in descending order.

There are three commonly used methods for sorting arrays in descending order in PHP:

• rsort() - Sort the array in descending order

• arsort() - Sort the array in descending order according to the key value of the associative array

• krsort() - Sort the array in descending order based on the key name of the associative array

1. Use rsort() - Sort the array in descending order

Example 1: Sort the elements in the array in descending numerical order

<?php
$arr=array(4,6,2,22,11,85);
var_dump($arr);
rsort($arr);
var_dump($arr);
?>

Example 2: Sort the elements in the array in descending alphabetical order

<?php
$arr=array("Volvo","BMW","Toyota","a");
var_dump($arr);
rsort($arr);
var_dump($arr);
?>

2, arsort() - According to the value of the array, Sort the array in descending order

<?php
$arr=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
var_dump($arr);
arsort($arr);
var_dump($arr);
?>

3. krsort() - Sort the array in descending order according to the keys of the array

<?php
$arr=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
var_dump($arr);
krsort($arr);
var_dump($arr);
?>

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