


Example 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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