Analysis of several commonly used PHP caching mechanisms
PHP caching mechanism analysis: several commonly used methods, specific code examples are required
Abstract:
In Web development, in order to improve the performance and response of web pages For speed, we usually use caching to reduce server load and network transmission delays. As a popular server-side scripting language, PHP also provides a variety of caching mechanisms to optimize page loading speed. This article will introduce several caching methods commonly used in PHP and give specific code examples.
1. Page caching
1. Static HTML file
Static HTML file is the simplest and most common page caching method. We can use PHP to cache dynamically generated web pages as static HTML files, and then directly return this static file every time it is accessed to avoid executing PHP code again. Specific code examples are as follows:
// 检查缓存文件是否存在 if (file_exists('cache.html')) { // 返回缓存文件 readfile('cache.html'); exit; } // 动态生成网页内容 $content = '...'; // 将网页内容写入缓存文件 file_put_contents('cache.html', $content); // 返回网页内容 echo $content;
2. Server-side caching
Server-side caching stores dynamically generated web pages in server memory to speed up subsequent access. PHP provides a variety of server-side caching extensions, such as APC, Redis and Memcached. The following is a sample code for page caching using APC extension:
// 检查缓存是否存在 if (apc_exists('page_cache')) { // 返回缓存数据 echo apc_fetch('page_cache'); exit; } // 动态生成网页内容 $content = '...'; // 将网页内容存储到缓存 apc_store('page_cache', $content); // 返回网页内容 echo $content;
2. Data caching
1. Variable caching
Variable caching stores frequently read data in memory to reduce The number of database queries. PHP provides multiple variable caching libraries, such as Memcached and Redis. The following is a sample code for variable caching using Memcached extension:
// 连接Memcached服务器 $memcached = new Memcached(); $memcached->addServer('127.0.0.1', 11211); // 检查缓存是否存在 if ($memcached->get('data_cache')) { // 返回缓存数据 $data = $memcached->get('data_cache'); } else { // 从数据库中查询数据 $data = '...'; // 将查询结果存储到缓存 $memcached->set('data_cache', $data, 3600); // 缓存一小时 } // 使用数据 echo $data;
2. Database query cache
Database query cache stores frequently executed SQL statements and their query results in memory to improve the database Query efficiency. PHP's PDO extension provides SQL query caching functionality. The following is a sample code that uses PDO for query caching:
// 连接数据库 $dsn = 'mysql:host=localhost;dbname=test'; $db = new PDO($dsn, 'username', 'password'); // 开启查询缓存 $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); $db->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true); $db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); $db->query('SET GLOBAL query_cache_size = 1000000'); // 设置缓存大小 // 执行查询语句 $sql = 'SELECT * FROM users'; $result = $db->query($sql); // 查询结果将被缓存起来 // 使用查询结果 foreach ($result as $row) { echo $row['name']; }
Conclusion:
By properly using the caching mechanism, we can improve the loading speed and performance of web pages. This article introduces several caching methods commonly used in PHP and gives specific code examples. Based on actual needs and project scale, we can choose an appropriate caching method to optimize PHP applications.
The above is the detailed content of Analysis of several commonly used PHP caching mechanisms. 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

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

Long URLs, often cluttered with keywords and tracking parameters, can deter visitors. A URL shortening script offers a solution, creating concise links ideal for social media and other platforms. These scripts are valuable for individual websites a

Following its high-profile acquisition by Facebook in 2012, Instagram adopted two sets of APIs for third-party use. These are the Instagram Graph API and the Instagram Basic Display API.As a developer building an app that requires information from a

Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-

This is the second and final part of the series on building a React application with a Laravel back-end. In the first part of the series, we created a RESTful API using Laravel for a basic product-listing application. In this tutorial, we will be dev

Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>

The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

The 2025 PHP Landscape Survey investigates current PHP development trends. It explores framework usage, deployment methods, and challenges, aiming to provide insights for developers and businesses. The survey anticipates growth in modern PHP versio
