import java.io.*; import java.net.*; public class Server { public static void main(String[] args) throws IOException{   System.out.println("Server started !\n");   ServerSocket server=new ServerSocket(5678);   while (true){                 Socket client=server.accept();                 System.out.println("client coming!\n");                 PrintWriter printer = new PrintWriter(client.getOutputStream());                 BufferedReader reader = new BufferedReader(new InputStreamReader(client.getInputStream()));                 String  m = reader.readLine();                 System.out.println("get infomation " + m + "\n from " + client.getInetAddress().toString());                 printer.println(m);                 printer.flush();                 printer.close();                 printer.close();                 client.close();                 System.out.println("client leaving!\n");               }         } }

<?php     $socket = socket_create ( AF_INET, SOCK_STREAM, SOL_TCP ) or die ( 'could not create socket' );     $connect = socket_connect ( $socket, '127.0.0.1', 5678 );     //向服务端发送数据     socket_write ( $socket, 'Hello' . "\n" );     //接受服务端返回数据     $str = socket_read ( $socket, 1024, PHP_NORMAL_READ );     echo $str;     //关闭     socket_close($socket);