求解:PHP socket 的问题
下面这段测试代码,我在本地用appserv搭建的环境,执行无误。而且可以用客户端连上去并执行。
<?php<br /> <br />//Reduce errors<br />error_reporting(~E_WARNING);<br /> <br />//Create a UDP socket<br />if(!($sock = socket_create(AF_INET, SOCK_DGRAM, 0)))<br />{<br /> $errorcode = socket_last_error();<br /> $errormsg = socket_strerror($errorcode);<br /> <br /> die("Couldn't create socket: [$errorcode] $errormsg \n");<br />}<br /> <br />echo "Socket created \n";<br /> <br />// Bind the source address<br />if( !socket_bind($sock, "localhost" , 9999) )<br />{<br /> $errorcode = socket_last_error();<br /> $errormsg = socket_strerror($errorcode);<br /> <br /> die("Could not bind socket : [$errorcode] $errormsg \n");<br />}<br /> <br />echo "Socket bind OK \n";<br /> <br />//Do some communication, this loop can handle multiple clients<br />while(1)<br />{<br /> echo "Waiting for data ... \n";<br /> <br /> //Receive some data<br /> $r = socket_recvfrom($sock, $buf, 512, 0, $remote_ip, $remote_port);<br /> echo "$remote_ip : $remote_port -- " . $buf;<br /> <br /> //Send back the data to the client<br /> socket_sendto($sock, "OK " . $buf , 100 , 0 , $remote_ip , $remote_port);<br />}<br /> <br />socket_close($sock);<br /><br />?>
但是,我放到vps上之后,它显示该端口是打开的,而且无法再次打开(第二遍执行这个脚本的时候,返回错误信息,端口已被占用)。我扫描端口发现9999确实已经是一个打开的UDP端口,但是,用客户端连得上去却没法完成通信(或许不可以发,或许不可以收,who knows。。。)
下面是phpinfo的结果,显示socket支持是打开的。(太长了,ctr+f后找到的socket都在这里了)
Configure Command './configure' '--prefix=/usr/local/php5' '--enable-force-cgi-redirect' '--enable-fastcgi' '--with-config-file-path=/usr/local/etc/php5/cgi' '--with-curl=/usr/local/lib' '--with-gd' '--with-gettext' '--with-jpeg-dir=/usr/local/lib' '--with-freetype-dir=/usr/local/lib' '--with-kerberos' '--with-openssl' '--with-mcrypt' '--with-mhash' '--with-mysql=/usr' '--with-mysqli=/usr/bin/mysql_config' '--with-pcre-regex=/usr/local' '--with-pdo-mysql=/usr' '--with-pear' '--with-png-dir=/usr/local/lib' '--with-xsl' '--with-zlib' '--with-zlib-dir=/usr/local/lib' '--enable-zip' '--enable-gd-native-ttf' '--with-iconv=/usr/local' '--enable-bcmath' '--enable-calendar' '--enable-ftp' '--enable-magic-quotes' '--enable-sockets' '--enable-mbstring'
Registered Stream Socket Transports tcp, udp, unix, udg, ssl, sslv3, sslv2, tls
sockets<br /><br />Sockets Support enabled<br />
default_socket_timeout 60 60
额,哪位大牛有过经验,跪谢啊~
------解决方案--------------------
换一个端口号
已打开的端口,就不能重复打开
------解决方案--------------------
看看防火墙什么的
------解决方案--------------------
9999 是已经打开的端口没错 但是你有没有9999这个端口有没有没其它的程序所占用 如果没有被其它的程序所占用那么可能考虑设置一下防火墙
否则的话 就换一个新的端口或者关闭占用9999端口的程序
也可以把那个程序换一个其它的端口
总之一个端口只能映射给一个程序

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.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.

Key players in HTTP cache headers include Cache-Control, ETag, and Last-Modified. 1.Cache-Control is used to control caching policies. Example: Cache-Control:max-age=3600,public. 2. ETag verifies resource changes through unique identifiers, example: ETag: "686897696a7c876b7e". 3.Last-Modified indicates the resource's last modification time, example: Last-Modified:Wed,21Oct201507:28:00GMT.

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.


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

SublimeText3 Mac version
God-level code editing software (SublimeText3)

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 Linux new version
SublimeText3 Linux latest version

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.