Home Backend Development PHP Tutorial PHP sorting algorithm insertion sort

PHP sorting algorithm insertion sort

Dec 09, 2019 pm 02:28 PM
php

Insert Sort

● The idea of ​​insertion sort:

Consider an unordered array to be sorted as two lists, one in order A list, an unordered list, take out one element to be inserted from the unordered list at a time, and insert it into the ordered list until the unordered list is empty and the sorting is completed

● Actual example :

1. There is an unordered one-dimensional array that needs to be sorted this time. The array is: [36,12,96,-1]

2. First, put the The first element [36] is regarded as an independent ordered list, and the remaining elements [12, 96, -1] are regarded as an unordered list

3. The first The element to be inserted is 12. To insert 12 into an ordered list, you first need to compare 12 and 36. If the inserted element 12 is less than 36, you need to insert 12 in front of 36, that is, 36 must be moved back one Bit.

4. Insertion sort actually requires comparing the total number of array elements minus one round, because the first element does not need to be compared.

$arr = [36,12,96,-1];
//待插入的数
$insertValue = $arr[1];
//待插入数前面的数的索引
$insertIndek = 1 - 1;
//$insertIndek >= 0 保证插入循环时,不越界,保证第一个元素的下标要大于等0
//$insertValue < $arr[$insertIndek] 保证待插入的数还没有找到插入的位置,即待插入的数是小于它前面的那一个元素的
//符合上述条件的,需要将$arr[$insertIndek] 后移
while($insertIndek >= 0 && $insertValue < $arr[$insertIndek]) {
 $arr[$insertIndek+1] = $arr[$insertIndek]; $insertIndek--;
 //代表的就是有序列表的最前面一个元素的前面一个下标 -1;
}
//当退出循环时,代表找到位置 $insertIndek + 1
$arr[$insertIndek + 1] = $insertValue;
//把插入的元素插入到有序列表的第一个位置或者是没发生交换就在本身的位置
$arr = [12,36,96,-1];
//待插入的数
$insertValue = $arr[2];
//待插入数前面的数的索引
$insertIndek = 2 - 1;
//$insertIndek >= 0 保证插入循环时,不越界,保证第一个元素的下标要大于等0
//$insertValue < $arr[$insertIndek] 保证待插入的数还没有找到插入的位置,即待插入的数是小于它前面的那一个元素的
//符合上述条件的,需要将$arr[$insertIndek] 后移
while($insertIndek >= 0 && $insertValue < $arr[$insertIndek]) {
 $arr[$insertIndek+1] = $arr[$insertIndek];
 $insertIndek--;
 //代表的就是有序列表的最前面一个元素的前面一个下标 -1;
}
//当退出循环时,代表找到位置 $insertIndek + 1
$arr[$insertIndek + 1] = $insertValue;//把插入的元素插入到有序列表的第一个位置或者是没发生交换就在本身的位置
Copy after login

And so on to get the completed ordered array

5. The complete code is as follows:

<?php
class InsertSort
{
 public static function insertArraySort(array $data):array
 { 
 if (!is_array($data)) {
 return [&#39;message&#39; => &#39;待排序的序列非数组&#39;];
 }
 $count = count($data);
 if ($count <= 1) {
 return $data;
 }
 for ($i = 1; $i < $count; $i++) {
 //待插入的元素
 $insertValue = $data[$i];
 //待插入数前面的数的索引
 $insertIndek = $i - 1;
 //$insertIndek >= 0 保证插入循环时,不越界,保证第一个元素的下标要大于等0\
 //$insertValue < $arr[$insertIndek] 保证待插入的数还没有找到插入的位置,即待插入的数是小于它前面的那一个元素的
 //符合上述条件的,需要将$arr[$insertIndek] 后移
 while($insertIndek >= 0 && $insertValue < $data[$insertIndek]) {
 $data[$insertIndek+1] = $data[$insertIndek];
 $insertIndek--;//代表的就是有序列表的最前面一个元素的前面一个下标 -1;
 }
 //当退出循环时,代表找到位置 $insertIndek + 1
 //把插入的元素插入到有序列表的第一个位置
 //或者是没发生交换,即待插入元素大于有序列表的最后一个元素,那么这里只需要将有序列表的最后一个元素的索引 + 1,把待插入元素放在后
 //面一位即可
 $data[$insertIndek + 1] = $insertValue;\ }
 return $data;
 }
 }
$arr = [36,12,96,-1];
var_dump(InsertSort::insertArraySort($arr));
Copy after login

The above is the detailed content of PHP sorting algorithm insertion sort. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Chat Commands and How to Use Them
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian 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

How To Set Up Visual Studio Code (VS Code) for PHP Development 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

7 PHP Functions I Regret I Didn't Know Before 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 do you parse and process HTML/XML in PHP? 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 JSON Web Tokens (JWT) and their use case in PHP APIs. 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 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

Explain late static binding in PHP (static::). 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? 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.

See all articles