Backend Development
PHP Tutorial
How to improve the access speed of PHP website through DNS pre-resolution?
How to improve the access speed of PHP website through DNS pre-resolution?
How to improve the access speed of PHP website through DNS pre-resolution?
In actual website development, access speed is a very important indicator. DNS (Domain Name System) pre-resolution is an effective method that can improve website access speed. This article will introduce how to improve the access speed of PHP websites through DNS pre-resolution and provide corresponding code examples.
1. What is DNS pre-resolution?
DNS pre-resolution refers to resolving the IP address corresponding to the domain name of the website in advance before the user accesses the website. Normally, users will first access the domain name of the website, and then the DNS server will resolve the domain name into an IP address, and then the user can access the website normally. The function of DNS pre-resolution is to resolve the domain name into an IP address in advance, so that when the user accesses the website, the IP address can be used directly to access the website without the need for DNS resolution, thus improving the access speed.
2. How to implement DNS pre-resolution?
- Use PHP’s gethostbyname() function to perform DNS pre-resolution.
The gethostbyname() function is used to obtain the IP address corresponding to a domain name. We can add the following code to the home page file of the website to perform DNS pre-resolution on the domain name of the website:
$domain = "www.example.com"; // 网站的域名 gethostbyname($domain); // 进行DNS预解析
- Use the link tag of HTML to implement DNS pre-resolution.
HTML link tag can be used to preload related resources, including DNS pre-resolution. We can add the following code in the
tag of the website to perform DNS pre-resolution on the domain name of the website:<head>
<!-- 对网站的域名进行DNS预解析 -->
<link rel="dns-prefetch" href="//www.example.com">
</head>3. Precautions for DNS pre-resolution
- DNS pre-resolution The parsing is only valid for users who visit the website for the first time. This is because after the first visit, the user's browser will cache the IP address of the website, and the cached IP address can be used directly during the next visit without the need for DNS resolution.
- DNS pre-resolution may cause additional network load. Because DNS pre-resolution will perform domain name resolution in advance, it may cause additional load on the DNS server.
- DNS pre-resolution requires server support. Although DNS pre-resolution is implemented through the client (user's browser), the server also needs to provide corresponding support. Specifically, the server needs to have the ability to quickly respond to DNS resolution requests.
- DNS retry time may affect the effect of DNS pre-resolution. DNS retry time refers to the time interval between retrying DNS resolution when the user's browser fails. If the DNS retry time is long, the effect of DNS pre-resolution may be weakened.
4. Summary
DNS pre-resolution can reduce the time of DNS resolution, thereby improving the access speed of PHP websites. In actual development, we can use PHP's gethostbyname() function or HTML's link tag to perform DNS pre-resolution. However, it should be noted that DNS pre-resolution is only effective for users who visit the website for the first time and requires server support. When applying DNS pre-resolution, you also need to consider the impact of DNS retry time on the pre-resolution effect.
I hope this article will help you understand how to improve the access speed of PHP websites through DNS pre-resolution!
The above is the detailed content of How to improve the access speed of PHP website through DNS pre-resolution?. 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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
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
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
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
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 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.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
