Summary of sorting function implemented in PHP

This article brings you relevant knowledge about PHP, which mainly introduces related issues about the sorting function, and completes the implementation of the php mysqli sorting function through examples. Let’s take a look at it together. I hope everyone has to help.

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Work with everyone to complete the implementation of the php mysqli sorting function.

1. sql:

-- phpMyAdmin SQL Dump
-- version 4.5.1
-- http://www.phpmyadmin.net
--
-- Host: 127.0.0.1
-- Generation Time: 2022-03-17 17:19:09
-- 服务器版本： 10.1.13-MariaDB
-- PHP Version: 5.6.21

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Database: `a`
--

-- --------------------------------------------------------

--
-- 表的结构 `search`
--

CREATE TABLE `search` (
  `id` int(11) NOT NULL DEFAULT '0',
  `content` text COLLATE utf8_vietnamese_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_vietnamese_ci;

--
-- 转存表中的数据 `search`
--

INSERT INTO `search` (`id`, `content`) VALUES
(666, 'cyg'),
(2, 'liwen'),
(555, 'liwen&cyg');

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

2. Usage steps

Core question:
1. How to connect to the database?

$link=mysqli_connect('localhost','root','','a');

Analysis: Link to the database, localhost on the local address of your computer. Database software username: root. Password "", database name: a
2. How to set the character encoding of the linked database?

mysqli_set_charset($link,'utf8');

Set this utf8 encoding so that there will be no garbled Chinese characters.
3. How to run sql in php?

mysqli_query($link,$sql);

Analysis: The first parameter is the variable assigned by the database link. The second parameter is the sql statement variable

4. How to write variables in the insert statement?

$sql = "INSERT INTO search(id,content)
VALUES ('{$id}','{$content}')";

Analysis: Just follow this format

5. How to write the sorting sql statement in ascending order? From smallest to largest is ascending order. Getting bigger and bigger

$sql = "SELECT id,content FROM search ORDER BY id";

6. How to write sql in descending order from large to small? Getting smaller and smaller

$sql = "SELECT id,content FROM search ORDER BY id desc";

7. The data traversed by mysqli_query must be converted into an array before it can be run.

$row=mysqli_fetch_array($result)

Analysis: Because foreach does not support the direct output of mysqli_query data

1. cyg.php

The code is as follows (example):

<?php $link=mysqli_connect(&#39;localhost&#39;,&#39;root&#39;,&#39;&#39;,&#39;a&#39;);
//然后是指定php链接数据库的字符集
mysqli_set_charset($link,&#39;utf8&#39;);
$sql="select * from search";
$result=mysqli_query($link,$sql);//运行sql

?>
<!--显示的效果-->
nbsp;html>


<meta>
<title>Document</title>

id	标题	内容
=$row['id'];?>	=$row['content'];?>
创建才能排序哦	升序	降序

2.create.php

nbsp;html>


<meta>
<title>Document</title>

alert('创建成功');"; ?> 返回

2.asc.php

nbsp;html>


<meta>
<title>Document</title>

id	标题	内容
=$row['id'];?>	=$row['content'];?>
创建才能排序哦	升序	降序

2.desc. php

nbsp;html>


<meta>
<title>Document</title>

id	标题	内容
=$row['id'];?>	=$row['content'];?>
创建才能排序哦	升序	降序

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