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HomeBackend DevelopmentPHP Tutorialphp简单socket服务器客户端代码实例_PHP

本篇文章分享一个简单的socket示例,用php。实现一个接收输入字符串,处理并返回这个字符串到客户端的TCP服务。

产生一个 socket 服务端

<&#63;php
/*文件名:socket_server.php*/
// 设置一些基本的变量
$host="127.0.0.1";//Socket运行的服务器的IP地址
$port=1234;//Socket运行的服务器的端口,端口取值为1到65535之间的数字,前提是这个端口未被使用
// 设置超时时间,这里设置为永不超时,确保PHP在等待客户端连接时不会超时。
set_time_limit(0);
// 创建一个Socket,返回一个Socket句柄
$socket=socket_create(AF_INET,SOCK_STREAM,0) or die("Could not create socket\n");
//绑定Socket到指定的地址和端口
$result=socket_bind($socket,$host,$port) or die("Could not bind to socket\n");
// 开始监听外部连接
$result=socket_listen($socket,3) or die("Could not set up socket listener\n");
/******到这里,服务器除了等待来自客户端的连接请求外基本上什么也不做******/
// 另一个Socket来处理服务端与客户端的通信
$spawn=socket_accept($socket) or die("Could not accept incoming connection\n");
// 读取客户端的输入,当一个连接被建立后,服务器就会等待客户端发送一些输入信息,这些信息可以由socket_read()函数来获得,并把它赋值给PHP的$input变量
$input=socket_read($spawn,1024) or die("Could not read input\n");
//socker_read的第二个参数用以指定读入的字节数,你可以通过它来限制从客户端获取数据的大小
// 下面这不就不解释了,不知道的自己面壁去
$input=trim($input);
//处理客户端输入并返回结果,当客户端发来数据信息后,信息输出就要靠socket_write()函数来完成
$output=strrev($input) ."\n";//反转字符串,这里仅仅是为了更好的区分两条信息
socket_write($spawn,$output,strlen($output)) or die("Could not write output\n");
// 关闭sockets
socket_close($spawn);
socket_close($socket);

提示:你应该使用你的命令提示符来运行上面这段代码。理由是因为这里将产生一个服务器,而不是一个Web页面。如果你尝试使用Web浏览器来运行这个脚本,那么很有可能它会超过30秒的限时。你可以使用下面的代码来设置一个无限的运行时间,但是还是建议使用命令提示符来运行。

代码如下:


set_time_limit(0);


在你的命令提示符中对这个脚本进行简单测试:

代码如下:


Php.exe socket_server.php


如果你没有在系统的环境变量中设置php解释器的路径,那么你将需要给php.exe指定详细的路径。当你运行这个服务器端的时候,你能够通过远程登陆(telnet)的方式连接到端口1337来测试这个服务器。

上面的服务器端有三个问题:

1. 它不能接受多个连接。

2. 它只完成唯一的一个命令。

3. 你不能通过Web浏览器连接这个服务器。

这个第一个问题比较容易解决,你可以使用一个应用程序去每次都连接到服务器。但是后面的问题是你需要使用一个Web页面去连接这个服务器,这个比较困难。你可以让你的服务器接受连接,然后些数据到客户端(如果它一定要写的话),关闭连接并且等待下一个连接。

在上一个代码的基础上再改进,产生下面的代码来做你的新服务器端:

<&#63;php
$commonProtocol = getprotobyname("tcp");
$socket = socket_create(AF_INET, SOCK_STREAM, $commonProtocol);
socket_bind($socket, 'localhost', 1337); //socket_bind() 把socket绑定在一个IP地址和端口上
socket_listen($socket);
$buffer = "NO DATA";
while(true) {
 // Accept any connections coming in on this socket
 $connection = socket_accept($socket);//socket_accept() 接受一个Socket连接
 printf("Socket connected\r\n");
 // Check to see if there is anything in the buffer
 if($buffer != ""){
 printf("Something is in the buffer...sending data...\r\n");
 socket_write($connection, $buffer . "\r\n"); //socket_write() 写数据到socket缓存
 printf("Wrote to socket\r\n");
 }else {
 printf("No Data in the buffer\r\n");
 }
 // Get the input
 while($data = socket_read($connection, 1024, PHP_NORMAL_READ)){//socket_read() 读取指定长度的数据
 $buffer = $data;
 socket_write($connection, "Information Received\r\n");
 printf("Buffer: " . $buffer . "\r\n");
 }
 socket_close($connection); //socket_close() 关闭一个socket资源
 printf("Closed the socket\r\n\r\n");
}


这个服务器端要做什么呢?它初始化一个socket并且打开一个缓存收发数据。它等待连接,一旦产生一个连接,它将打印“Socket connected”在服务器端的屏幕上。这个服务器检查缓冲区,如果缓冲区里有数据,它将把数据发送到连接过来的计算机。然后它发送这个数据的接受信息,一旦它接受了信息,就把信息保存到数据里,并且让连接的计算机知道这些信息,最后关闭连接。当连接关闭后,服务器又开始处理下一次连接。

产生一个 socket 客户端

处理第二个问题是很容易的。你需要产生一个php页连接一个socket,发送一些数据进它的缓存并处理它。然后你有个处理后的数据在还顿,你能够发送你的数据到服务器。在另外一台客户端连接,它将处理那些数据。

下面的例子示范了使用socket:

<&#63;php
// Create the socket and connect
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$connection = socket_connect($socket,'localhost', 1337);
while($buffer = socket_read($socket, 1024, PHP_NORMAL_READ)) {
 if($buffer == "NO DATA") {
 echo("<p>NO DATA</p>");
 break;
 }else{
 // Do something with the data in the buffer
 echo("<p>Buffer Data: " . $buffer . "</p>");
 }
}
echo("<p>Writing to Socket</p>");
// Write some test data to our socket
if(!socket_write($socket, "SOME DATA\r\n")){
 echo("<p>Write failed</p>");
}
// Read any response from the socket phpernote.com
while($buffer = socket_read($socket, 1024, PHP_NORMAL_READ)){
 echo("<p>Data sent was: SOME DATA<br> Response was:" . $buffer . "</p>");
}
echo("<p>Done Reading from Socket</p>");

这个例子的代码演示了客户端连接到服务器。客户端读取数据。如果这是第一时间到达这个循环的首次连接,这个服务器将发送“NO DATA”返回给客户端。如果情况发生了,这个客户端在连接之上。客户端发送它的数据到服务器,数据发送给服务器,客户端等待响应。一旦接受到响应,那么它将把响应写到屏幕上。

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