


How to use caching technology to solve PHP high concurrency processing problems
How to use caching technology to solve the problem of high concurrency processing in PHP
Due to the rapid development of the Internet, today's websites and applications are facing increasingly high concurrent visits. . When a large number of users access a PHP website at the same time, the traditional PHP script execution method may cause server performance to decrease, response time to become longer, and even a crash to occur. In order to solve this problem, we can use caching technology to improve the concurrent processing capabilities of the PHP website.
- What is caching technology?
Caching technology is to temporarily store some frequently accessed data in high-speed storage media so that it can be quickly provided to the next request, thereby reducing the burden on the database and server and improving system performance and response. speed. Common caching technologies include page caching, database caching, object caching, etc.
- How to use caching technology to solve high concurrency processing problems?
In PHP, we can use Memcached or Redis as a cache server to store some commonly used data in the cache server, thereby reducing the pressure on the database. The following is a sample code:
<?php // 连接到Memcached服务器 $memcached = new Memcached(); $memcached->addServer("127.0.0.1", 11211); // 检查缓存中是否存在数据 $key = "user_123"; $user = $memcached->get($key); // 如果缓存中不存在数据,则从数据库中获取,并存储到缓存中 if (!$user) { $user = getUserFromDatabase(); // 将数据存储到缓存中,过期时间设置为1小时 $memcached->set($key, $user, 3600); } // 使用$user数据进行业务逻辑处理 // ... // 清除缓存 $memcached->delete($key);
- How to handle the update and deletion of cached data?
When the data is updated, the data in the cache needs to be updated in time. You can update the data in the corresponding cache while updating the database data. In addition, when data is deleted, the data in the cache must also be deleted simultaneously.
The following is sample code for updating and deleting cache:
<?php // 更新数据库中的数据 updateUserInDatabase($user); // 更新缓存中的数据 $memcached->set($key, $user, 3600); // 删除数据库中的数据 deleteUserFromDatabase($userId); // 删除缓存中的数据 $memcached->delete($key);
- How to avoid cache penetration and cache penetration issues?
Cache penetration means that when a user requests data that does not exist in the cache or database, it will cause the database to be accessed every time, causing excessive pressure on the database. When reading data, you can first check whether the data exists in the cache. If it does not exist, return a default value and cache the default value in the cache to avoid multiple accesses to the database.
Cache breakdown means that after a hotspot data fails, a large number of concurrent requests happen to access the data, causing multiple requests to access the database at the same time. In order to avoid cache breakdown, a short-lived mutex can be set up. When the cache is invalid, only one request is allowed to access the database for data update, and other requests wait and read the updated cache data.
Sample code:
<?php // 检查缓存中是否存在数据 $user = $memcached->get($key); // 如果缓存中不存在数据,则加锁 if (!$user) { if ($memcached->add($key . "_lock", 1, 60)) { // 从数据库中获取数据 $user = getUserFromDatabase(); // 将数据存储到缓存中,过期时间设置为1小时 $memcached->set($key, $user, 3600); // 解锁 $memcached->delete($key . "_lock"); } else { // 等待并读取更新后的缓存数据 while (!$user) { usleep(1000); $user = $memcached->get($key); } } } // 使用$user数据进行业务逻辑处理 // ...
Summary:
By using caching technology, we can effectively solve the problem of high concurrency processing in PHP. Using a cache server to store commonly used data can greatly reduce the burden on the database and improve system performance and response speed. At the same time, we also need to pay attention to updating and deleting cache data, and reasonably deal with cache penetration and cache breakdown issues.
By rationally using caching technology, we can improve the concurrent processing capabilities of the PHP website and provide a better user experience.
The above is the detailed content of How to use caching technology to solve PHP high concurrency processing problems. 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

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

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

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

To work on file upload we are going to use the form helper. Here, is an example for file upload.

In this chapter, we are going to learn the following topics related to routing ?

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

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

Validator can be created by adding the following two lines in the controller.
