


About PHP Websocket Error: 'stream_select(): You MUST reco_PHP Tutorial
When I recently used Ratchet (a PHP websocket framework) to transform a PHP website, an error occurred:
"It is set to 1024, but you have descriptors numbered at least as high as 1266.
--enable-fd-setsize=2048 is recommended, but you may want to set it
to equal the maximum number of open files supported by your system"
After several twists and turns, I found that the reason is that the PHP source code sets FD_SIZE to 1024. Once there are more than 1024 websocket connections, this error will be reported. The solution on the Internet is basically to modify the PHP source code and recompile PHP. However, I personally think that modifying the PHP source code is risky, so I came up with a new idea and successfully used it in the project (you are welcome to submit a copy).
The basic principle is to open several more websocket service processes in the background, and each process uses a different port number. The front-end js randomly connects to the websocket service process port number open in the background. In this way, each websocket service process has 1024 available connections. The number of websocket service processes required can be calculated based on the peak number of connections of the website. Of course, some margin needs to be left. In this way, there is no need to recompile the PHP source code, and it can easily break through the 1024 connection limit of PHP websocket.
Backend implementation
Write a push-server.php as a websocket service. The implementation of push-server can refer to the Ratchet example, but it needs a slight modification, that is, you can enter port as the command line parameter.
$port = $argv[1]; if ($port == ""){ $port = 40003; // 默认端口,如果启动push-server.php时不写参数,则使用40003端口 } // .....省略其他代码 ..... // 将$port作为监听端口传入 $webSock->listen($port, '0.0.0.0');
As needed, multiple websocket processes can be started, such as:
php push-server 40003
php push-server 40004
php push-server 40005
In this way, the background can tolerate 1024 * 3 = 3072 websocket connections.
Front-end implementation
The code to randomly obtain the connection service is as follows:
<span function</span><span getWSServer() { </span><span var</span> serverPorts = ['40003', '40004', '40005'<span ]; </span><span var</span> server = 'ws://youhost'<span ; </span><span var</span> randomPortIndex = Math.floor(Math.random() *<span serverPorts.length); server </span>+= ':' +<span serverPorts[randomPortIndex]; </span><span return</span><span server; };</span>
Of course, you can also specify when to connect to a certain websocket service according to your own needs, so I won’t go into details.

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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Dreamweaver Mac version
Visual web development tools

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),

SublimeText3 Chinese version
Chinese version, very easy to use

WebStorm Mac version
Useful JavaScript development tools

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.