socket原理

客户端：
<?php
header("Content-type: text/html; charset=utf-8");
/**
 * File name:client.php
* 客户端代码
*
 * @author guisu.huang
* @since 2012-04-11
*/
set_time_limit(0);

$host = "192.168.1.106";
$port = 2048;

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)or die("Could not create     socket
"); // 创建一个Socket
$connection = socket_connect($socket, $host, $port) or die("Could not connet server
");    //  连接
$str = $_POST["con"];
$str =  iconv("UTF-8","GB2312",$str);
//$str = "hello";
socket_write($socket, $str) or die("Write failed
"); // 数据传送 向服务器发送消息
while ($buff = @socket_read($socket, 1024, PHP_NORMAL_READ)) {
    //echo "Response was:" . $buff . "
";
    echo $buff;
}
socket_close($socket);




服务端：

<?php
/**
 * File name server.php
 * 服务器端代码
 * 
 * @author guisu.huang
 * @since 2012-04-11
 * 
 */

//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 = "192.168.1.108";
$port = 2048; //调试的时候，可以多换端口来测试程序！
/**
 * 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
*/
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() 失败的原因是:" . socket_strerror(socket_last_error()) . "/n");
//阻塞模式
socket_set_block($sock) or die("socket_set_block() 失败的原因是:" . socket_strerror(socket_last_error()) . "/n");
//绑定到socket端口
$result = socket_bind($sock, $address, $port) or die("socket_bind() 失败的原因是:" . socket_strerror(socket_last_error()) . "/n");
//开始监听
$result = socket_listen($sock, 4) or die("socket_listen() 失败的原因是:" . socket_strerror(socket_last_error()) . "/n");
echo "OK
Binding the socket on $address:$port ... ";
echo "OK
Now ready to accept connections.
Listening on the socket ... 
";
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");

     //读取客户端数据
     echo "Read client data: ";
     //socket_read函数会一直读取客户端数据,直到遇见
,	或者字符.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   
";
     
     //数据传送 向客户端写入返回结果
     $msg ="欢迎访问服务器".rand(1,10)."
";
    //$msg =  iconv("UTF-8","GB2312",$msg);
     socket_write($msgsock, $msg, strlen($msg)) or die("socket_write() failed: reason: " . socket_strerror(socket_last_error()) ."/n");
     //一旦输出被返回到客户端,父/子socket都应通过socket_close($msgsock)函数来终止
    socket_close($msgsock);
} while (true);
socket_close($sock);