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HomeBackend DevelopmentPHP TutorialExample explanation of TCP server and client functions implemented by PHP programming

这篇文章主要介绍了PHP编程实现的TCP服务端和客户端功能,结合实例形式分析了php基于socket实现TCP服务器端与客户端通信功能的相关配置、定义与使用技巧,需要的朋友可以参考下

本文实例讲述了PHP编程实现的TCP服务端和客户端功能。分享给大家供大家参考,具体如下:

1、修改php.ini,打开extension=php_sockets.dll

2、服务端程序SocketServer.php

<?php
//确保在连接客户端时不会超时
set_time_limit(0);
//设置IP和端口号
$address = "127.0.0.1";
$port = 3046;
/**
 * 创建一个SOCKET
 * AF_INET=是ipv4 如果用ipv6,则参数为 AF_INET6
 * SOCK_STREAM为socket的tcp类型,如果是UDP则使用SOCK_DGRAM
*/
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() fail:" . socket_strerror(socket_last_error()) . "/n");
//阻塞模式
socket_set_block($sock) or die("socket_set_block() fail:" . socket_strerror(socket_last_error()) . "/n");
//绑定到socket端口
$result = socket_bind($sock, $address, $port) or die("socket_bind() fail:" . socket_strerror(socket_last_error()) . "/n");
//开始监听
$result = socket_listen($sock, 4) or die("socket_listen() fail:" . socket_strerror(socket_last_error()) . "/n");
echo "OK\nBinding the socket on $address:$port ... ";
echo "OK\nNow ready to accept connections.\nListening on the socket ... \n";
do { // never stop the daemon
  //它接收连接请求并调用一个子连接Socket来处理客户端和服务器间的信息
  $msgsock = socket_accept($sock) or die("socket_accept() failed: reason: " . socket_strerror(socket_last_error()) . "/n");
  while(1){
    //读取客户端数据
    echo "Read client data \n";
    //socket_read函数会一直读取客户端数据,直到遇见\n,\t或者\0字符.PHP脚本把这写字符看做是输入的结束符.
    $buf = socket_read($msgsock, 8192);
    echo "Received msg: $buf  \n";
    if($buf == "bye"){
      //接收到结束消息,关闭连接,等待下一个连接
      socket_close($msgsock);
      continue;
    }
    //数据传送 向客户端写入返回结果
    $msg = "welcome \n";
    socket_write($msgsock, $msg, strlen($msg)) or die("socket_write() failed: reason: " . socket_strerror(socket_last_error()) ."/n");
  }
} while (true);
socket_close($sock);
?>

3、客户端程序SocketClient.php

<?php
set_time_limit(0);
$host = "127.0.0.1";
$port = 3046;
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)or die("Could not create socket\n");
$connection = socket_connect($socket, $host, $port) or die("Could not connet server\n");
socket_write($socket, "hello socket") or die("Write failed\n");
while ($buff = socket_read($socket, 1024, PHP_NORMAL_READ)) {
  echo("Response was:" . $buff . "\n");
  echo("input what you want to say to the server:\n");
  $text = fgets(STDIN);
  socket_write($socket, $text);
}
socket_close($socket);
?>

4、测试

运行服务端程序:C:\wamp\bin\php\php5.4.16\php.exe C:\wamp\www\SocketServer.php

运行客户端程序: C:\wamp\bin\php\php5.4.16\php.exe C:\wamp\www\SocketClient.php

如果遇到

Fatal error: Call to undefined function socket_create()。

1. 找到php.ini,看 extension=php_gd2.dll   和  extension=php_sockets.dll 扩展是否打开;

2. 看phpInfo()显示的内容里,socket模块是否为enable;

我检查了一下,发现都是符合的。但错误仍然出现?怎么回事呢?

后来我才发现,原来是我在phpInfo()里看到的和在cmd窗口里使用的php不是同一个东西。

原因是我多次安装过php. 先前的php在系统的环境变量里面注册了path。所以在cmd窗口里使用的是以前的php. 而在phpInfo()里显示的是现在的php的设置。

解决的办法很简单了,就把系统环境变量里的path里,指向老的Php的路径改为指向正在使用的Php的路径。这样在cmd里的php和在浏览器里的php就是同一个东西了。

就是这样。

5、其流程与C语言很相似,实际上就是封装了C语言的socket

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