php教程
php手册
A preliminary study on PHP paging. A simple implementation of the simplest PHP paging code, a preliminary study on paging.
A preliminary study on PHP paging. A simple implementation of the simplest PHP paging code, a preliminary study on paging.
Preliminary exploration of PHP paging A simple implementation of the simplest PHP paging code, preliminary exploration of paging
PHP paging code must be used in various program development, on the website It is a must-select during development.
To write paging code, you must first understand the SQL query statement: select * from goods limit 2,7. The core of the PHP paging code revolves around this statement. The SQL statement explains: Query the goods data table and retrieve 7 pieces of data starting from the 2nd piece of data. In the paging code, 7 represents how many pieces of content are displayed on each page, and 2 represents the number of page turns calculated by a formula. By replacing the value of "2" with different parameters, you can filter out different data.
index.php:
include 'conn.php'; //引入数据库操作类
$conn=new conn(); //实例化数据库操作类
$total=$conn->getOne('select count(*) as total from goods');
$total=$total['total']; //goods表数据总数据条数
$num=6; //每页显示条数
$totalpage=ceil($total/$num); //计算页数
if(isset($_GET['page']) && $_GET['page']<=$totalpage){//这里做了一个判断，若get到数据并且该数据小于总页数情况下才付给当前页参数，否则跳转到第一页
$thispage=$_GET['page'];
}else{
$thispage=1;
}
<BR>//注意下面sql语句中红色部分，通过计算来确定从第几条数据开始取出，当前页数减去1后再乘以每页显示数据条数
$sql='select goods_id,goods_name,shop_price from goods order by goods_id limit '.<SPAN style="COLOR: #ff0000">($thispage-1)*$num</SPAN>.','.$num.'';
$data=$conn->getAll($sql);
foreach($data as $k=>$v){
echo '<li>'.$v['goods_id'].'、'.$v['goods_name'].'---￥'.$v['shop_price'].'</li>';
}
<BR>//显示分页数字列表
for($i=1;$i<=$totalpage;$i++){
echo '<a href="?page='.$i.'">'.$i.'</a> ';
}The above code implements the simplest PHP paging effect:
Only click on the page turning number to display different page turning data. It can be further improved on this basis. As long as the basic principles are understood, subsequent work will be easier to develop.
conn.php code:
/*
*连接数据库 进行相关查询操作
*/
class conn{
public function __construct(){
include_once('config.php');
try{
$this->pdo = new PDO('mysql:host=localhost;dbname=test', 'root', '123456');
$this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$this->pdo->exec('set names utf8');
}catch(PDOException $e){
echo '数据库连接失败:'.$e->getMessage();
exit();
}
}
//获取一行数据
public function getOne($sql){
$rs=$this->pdo->query($sql)->fetch(PDO::FETCH_ASSOC);
return $rs;
}
//获取多行数据结果
public function getAll($sql){
$rs=$this->pdo->query($sql)->fetchall(PDO::FETCH_ASSOC);
return $rs;
}
}The function of conn.php is to complete the database connection and implement the data extraction operation method. Here I am using pdo. The code can be organized according to everyone's habits.
config.php:
* *配置数据库信息 */ $cfg_dbhost='localhost'; $cfg_dbname='test'; $cfg_dbuser='root'; $cfg_dbpw='123456';
This example is only to illustrate the basic paging principle, and there are still many modifications before it can be used in practice.
The above is the initial exploration of PHP paging brought to you by the editor. A simple implementation of the simplest PHP paging code. I hope you like it~
If you want to know more game activities and game strategies, please continue to pay attention to this site. The editor of this site will bring you the best, most fun, and freshest game information as soon as possible. More exciting content, all in the jb51 game channel!
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
AI Hentai Generator
Generate AI Hentai for free.
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
1378
52
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
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
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?
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.
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
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.
