php中socket通信机制实例详解,socket详解
php中socket通信机制实例详解,socket详解
本文实例讲述了php中socket通信机制及用法。分享给大家供大家参考。具体分析如下:
一、socket是什么
什么是socket 所谓socket通常也称作"套接字",用于描述ip地址和端口,是一个通信链的句柄。应用程序通常通过"套接字"向网络发出请求或者应答网络请求。说白了就是一种通信机制。它类似于银行,电信啊这些部分的电话客服部门。你打电话的时候,那边会分配置一个人回答你的问题,客服部门就相当于socket的服务器端了,你这边呢就相当于客户端了,在和你通话结束前,如果有人在想找和你通话的那个说话,是不可能的,因为你在和他通信,当然客服部门的电话交换机也不会重复分配。
下面我将举例子来说明一下,socket是怎么工作的。如果你是基于应用层开发的人员并不一定要理解原理,但是能知道那是更好了。网上有关于socket的php api。下下来用就行了。
二、socket服务器server.php
复制代码 代码如下:
// 建立server端socket
$tcp = getprotobyname("tcp");
$socket = socket_create(af_inet, sock_stream, $tcp);
socket_bind($socket, '127.0.0.1', 10008); //绑定要监听的端口
socket_listen($socket); //监听端口
//初始化一个数据,和客户端通信
$buffer = "connect";
while (true) {
// 接受一个socket连接
$connection = socket_accept($socket);
if(!$connection){
echo "connect fail";
}else{
echo "socket connected ";
// 向客户端传递一个信息数据
if ($buffer != "") {
echo "send data to client ";
socket_write($connection, $buffer . " ");
echo "wrote to socket ";
} else {
echo "no data in the buffer " ;
}
// 从客户端取得信息
while ($data = @socket_read($connection, 1024, php_normal_read)) {
printf("buffer: " . $data . " ");
//取得信息给客户端一个反馈
socket_write($connection, "information received ");
}
}
socket_close($connection);
//关闭 socket
printf("closed the socket ");
}
?>
三、socket客户端client.php
复制代码 代码如下:
// 建立客户端的socet连接
$socket = socket_create(af_inet, sock_stream, sol_tcp);
$connection = socket_connect($socket, '127.0.0.1', 10008); //连接服务器端socket
while ($buffer = @socket_read($socket, 1024, php_normal_read)) {
//服务端告诉客户端,自己的状态
if (preg_match("/not connect/",$buffer)) {
echo "don`t connect ";
break;
} else {
//服务器传来信息
echo "buffer data: " . $buffer . " ";
echo "writing to socket ";
// 将客户的信息写到通道中,传给服务器端
if (!socket_write($socket, "some data ")) {
echo "write failed ";
}
//服务器端收到信息后,给于的回应信息
while ($buffer = socket_read($socket, 1024, php_normal_read)) {
echo "sent to server: some data response from server was:" . $buffer . " ";
}
}
}
?>
四、通信机制的一个图片(不考虑等待时间结束自动关闭socket)
简单说明一下,在说明前我要说一下,为什么要用php命令来执行服务器和客户端,客户端你用fsockopen,这样就在流览器上访问了,不至少于会连接超时。为什么会这样呢,因为你创建一个socket时,它会不断的去监听客户有没有要来连接。
socket通信的建立要二个socket通道,一个是服务器端创建的,一个是客户端创建的。
1号线,服务器创建一个socket通道,并将信息放到缓存,等待客户端连接
2号线,客户端创建一个socket通道,并连接服务器端,取得服务器端的信息进行通信,将要传的信息送入通道
3号线,服务器端从客户端取得信息,并告诉客户端,信息我已经收到了。将要传的信息送入通道
4号线,客户端从服务器端取得确认信息
到此一个通信就完全建立了,数据传输完毕后,服务器端会断开socket通信,具体操作如下.
1 运行socket服务器端
复制代码 代码如下:
[root@blackghost zhangy]# /usr/local/php/bin/php -a /home/zhangy/www/test2/server.php
interactive mode enabled
这一点做了那些工作呢
a 监听了一个10008端口
复制代码 代码如下:
[zhangy@blackghost ~]$ netstat -an |grep listen |grep 10008
tcp 0 0 127.0.0.1:10008 0.0.0.0:* listen
[zhangy@blackghost ~]$
b 将信息送到缓存里面
复制代码 代码如下:
$buffer = "connect";
看上面的代码2 运行socket客户端
复制代码 代码如下:
[root@blackghost zhangy]# /usr/local/php/bin/php -a /home/zhangy/www/test2/client.php
interactive mode enabled
buffer data: connect
writing to socket
sent to server: some data
response from server was:information received
3 回到服务器端
复制代码 代码如下:
[root@blackghost zhangy]# /usr/local/php/bin/php -a /home/zhangy/www/test2/server.php
interactive mode enabled
socket connected
send data to client
wrote to socket
buffer: some data
closed the socket
希望本文所述对大家的php程序设计有所帮助。

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 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

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

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

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,

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

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.

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

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.
