Backend Development
PHP Tutorial
Tips for learning PHP arrays: Use array functions to sort arrays in descending order!
Tips for learning PHP arrays: Use array functions to sort arrays in descending order!
In the previous article "How to learn PHP arrays, use array functions to sort arrays in ascending order! ", we introduced the use of array functions sort(), asort(), ksort() to sort arrays in ascending order. Since there is ascending order, there is also descending order. So how to use the array function to sort the array in descending order? Let’s learn together below!
Similar to ascending sorting of arrays, there are three functions available for descending sorting of arrays, namely rsort(), arsort(), and krsort(). Let's first take a brief look at these three functions, and then use code examples to see how these array sorting functions perform descending sorting.
Three functions for sorting arrays in descending order:
rsort(): Sort array elements 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 according to the key name of the associative array
1. Use the rsort() function
rsort() function is used to sort the array elements in descending order, that is, from large to small and from high to low. Let’s take a look at the code example:<?php
header("Content-type:text/html;charset=utf-8");
$arr = array(2, 1, 5, 16, 29, 15);
rsort($arr);
var_dump($arr);
?>
rsort() function has two parameters: $array (required) and $sortingtype (can be omitted). The $sortingtype parameter is used to indicate the sorting mode. For specific values, please refer to theOutput result:sort() function in the previous article. Below, arsort() and krsort() also refer to the sort() function.
<?php header("Content-type:text/html;charset=utf-8"); $arr = array(2, 1, 5, 16, 29, 15); rsort($arr,2); var_dump($arr); ?>Copy after login
2. Use the arsort() function
The arsort() function will sort the associative array in descending order according to the key values and will not modify the key names in the original array. .<?php
header("Content-type:text/html;charset=utf-8");
$age = array("张三"=>30,"李四"=>23,"王五"=>15,"李华"=>12,"娜娜"=>26,"小红"=>16);
arsort($age);
var_dump($age);
arsort($age,2);
var_dump($age);
?>
3. Use krsort() function
krsort() function will be based on The key names of the associative array are sorted in descending order, and the key names in the original array will not be modified.<?php
header("Content-type:text/html;charset=utf-8");
$arr= array("l"=>"lemon", "o"=>"orange", "b"=>"banana", "a"=>"apple");
krsort($arr);
var_dump($arr);
krsort($arr,1);
var_dump($arr);
?>
PHP function array array function video explanation, come and learn!
The above is the detailed content of Tips for learning PHP arrays: Use array functions to sort arrays in descending order!. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
