An example of socket programming in php

 error_reporting(E_ALL);
 set_time_limit(0);
 echo "TCP/IP Connectionn";

 $port = 1935;
 $ip = "127.0.0.1";

 /*
  +-------------------------------
  *    @socket连接整个过程
  +-------------------------------
  *    @socket_create
  *    @socket_connect
  *    @socket_write
  *    @socket_read
  *    @socket_close
  +--------------------------------
  */

 $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
 if ($socket < 0) {
     echo "socket_create() failed: reason: " . socket_strerror($socket) . "n";
 }else {
     echo "OK.n";
 }

 echo "试图连接 '$ip' 端口 '$port'...n";
 $result = socket_connect($socket, $ip, $port);
 if ($result < 0) {
     echo "socket_connect() failed.nReason: ($result) " . socket_strerror($result) . "n";
 }else {
     echo "连接OKn";
 }

 $in = "Horn";
 $in .= "first bloodrn";
 $out = '';

 if(!socket_write($socket, $in, strlen($in))) {
     echo "socket_write() failed: reason: " . socket_strerror($socket) . "n";
 }else {
     echo "发送到服务器信息成功！n";
     echo "发送的内容为:$in ";
 }

 while($out = socket_read($socket, 8192)) {
     echo "接收服务器回传信息成功！n";
     echo "接受的内容为:",$out;
 }

  echo "关闭SOCKET...n";
  socket_close($socket);
  echo "关闭OKn";
?>

服务器端代码：

  //确保在连接客户端时不会超时
  set_time_limit(0);

  $ip = '127.0.0.1';
  $port = 1935;

  /*
   +-------------------------------
  *    @socket通信整个过程
  +-------------------------------
  *    @socket_create
  *    @socket_bind
  *    @socket_listen
  *    @socket_accept
  *    @socket_read
  *    @socket_write
  *    @socket_close
  +--------------------------------
  */

 /*----------------以下操作都是手册上的-------------------*/
 if(($sock = socket_create(AF_INET,SOCK_STREAM,SOL_TCP)) < 0) {
     echo "socket_create() 失败的原因是:".socket_strerror($sock)."n";
 }

 if(($ret = socket_bind($sock,$ip,$port)) < 0) {
     echo "socket_bind() 失败的原因是:".socket_strerror($ret)."n";
 }

 if(($ret = socket_listen($sock,4)) < 0) {
     echo "socket_listen() 失败的原因是:".socket_strerror($ret)."n";
 }

 $count = 0;

 do {
     if (($msgsock = socket_accept($sock)) < 0) {
        echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . "n";
         echo "等待连接...";
         break;
     } else {

        //发到客户端
         $msg ="测试成功！n";
         socket_write($msgsock, $msg, strlen($msg));

         echo "测试成功了啊n";
         $buf = socket_read($msgsock,8192);

        $talkback = "收到的信息:$bufn";
        echo $talkback;

       if(++$count >= 5){
            break;
        };
    }
     //echo $buf;
     socket_close($msgsock);

 } while (true);

 socket_close($sock);
?>