The application of PHP caching technology is quite common. Maybe some people don’t know much about this technology. We will now introduce the relevant application skills of PHP caching technology in detail.
In most cases our website will use a database as a container for site data storage. When you execute a SQL query, the typical process is: connect to the database -> prepare the SQL query - > send the query to the database - > get the results returned by the database - > close the database connection. However, some data in the database is completely static or changes infrequently. The caching system will cache the results of SQL queries to a faster storage system to avoid frequent database operations and greatly improve program execution. time, and caching query results also allows you to process them later.
1. Data caching of PHP caching technology:
The data caching mentioned here refers to the database query cache. Every time a page is accessed, it will first detect whether the corresponding cached data exists. If it does not exist, it will connect to the database and get the data. , and serialize the query results and save them to the file
. In the future, the same query results will be obtained directly from the cache file.
2. Page caching of PHP caching technology:
Every time you access a page, it will first detect whether the corresponding cached page file exists. If it does not exist, connect to the database, get the data, display the page and generate the cached page file at the same time. This way The page file will come into play the next time you visit. (Template engines and some common cache classes on the Internet usually have this function)
3. PHP caching technology memory cache:
I won’t introduce it here. It is not what this article will discuss. I will just briefly mention it:
Memcached is high-performance , a distributed memory object cache system, used to reduce database load and improve access speed in dynamic applications.
dbcached is a distributed key-value database memory caching system based on Memcached and NMDB.
Although the above caching technology can well solve the problem of frequent database queries, its disadvantage is that the data is not timely. Here I give the methods I commonly use in projects:
4. Time-triggered caching of PHP caching technology:
Check whether the file exists and the timestamp is less than the set expiration time. If the file modification timestamp is greater than the current timestamp minus the expiration timestamp, then use the cache, otherwise update the cache.
Do not judge whether the data needs to be updated within the set time, and update the cache after the set time. The above is only suitable for use when timeliness requirements are not high, otherwise please see below.
5. Content-triggered caching of PHP caching technology:
When data is inserted or updated, the cache is forced to be updated.
Here we can see that when a large amount of data needs to be updated frequently, disk read and write operations will eventually be involved. How to solve it? In my daily projects, I usually do not cache all the content, but cache some content that does not change frequently to solve the problem. But in the case of heavy load, it is best to use shared memory as a cache system.
At this point, PHP caching may be a solution, but its disadvantage is that because each request still needs to be parsed by PHP, the efficiency problem is still more serious under heavy load. In this case, static may be used cache.
6. Static caching of PHP caching technology
The static caching mentioned here refers to HTML caching. HTML caching generally does not need to determine whether the data needs to be updated, because usually when HTML is used, it is usually a page whose content does not change frequently. When the data is updated, just force the HTML to be updated.
I hope that through the introduction of the above content, you can deepen your understanding of PHP caching technology.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Dreamweaver CS6
Visual web development tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment