PHPソケットについて

<?php// Server// 设置错误处理error_reporting (E_ALL);// 设置运行时间set_time_limit (0);// 起用缓冲ob_implicit_flush ();$ip = "127.0.0.1";        // IP地址$port = 1000;             // 端口号$socket = socket_create (AF_INET, SOCK_STREAM, SOL_TCP);       // 创建一个SOCKETif ($socket)    echo "socket_create() successed!\n";else    echo "socket_create() failed:".socket_strerror ($socket)."\n";$bind = socket_bind ($socket, $ip, $port);              // 绑定一个SOCKETif ($bind)    echo "socket_bind() successed!\n";else    echo "socket_bind() failed:".socket_strerror ($bind)."\n";$listen = socket_listen ($socket);                 // 间听SOCKETif ($listen)    echo "socket_listen() successed!\n";else    echo "socket_listen() failed:".socket_strerror ($listen)."\n";while (true){    $msg = socket_accept ($socket);               // 接受一个SOCKET    if (!$msg)    {        echo "socket_accept() failed:".socket_strerror ($msg)."\n";        break;    }    $welcome = "服务端收到:Welcome to PHP Server!\n";    socket_write ($msg, $welcome, strlen ($welcome));    while (true)    {        $command = strtoupper (trim (socket_read ($msg, 1024)));        if (!$command)            break;        switch ($command)        {            case "HELLO":                $writer = "Hello Everybody!";                break;            case "QUIT":                $writer = "Bye-Bye";                break;            case "HELP":                $writer = "HELLO\tQUIT\tHELP";                break;            default:                $writer = "Error Command!";        }        socket_write ($msg, $writer, strlen ($writer));        if ($command == "QUIT")            break;    }    socket_close ($msg);    if ($command == "QUIT")        break;}socket_close ($socket);                   // 关闭SOCKET

<?php// Client // 设置错误处理error_reporting (E_ALL);// 设置处理时间set_time_limit (0);$ip = "127.0.0.1";       // IP 地址$port = 1000;            // 端口号$socket = socket_create (AF_INET, SOCK_STREAM, SOL_TCP);   // 创建一个SOCKETif ($socket)    echo "socket_create() 成功!<br>\n";else    echo "socket_create() 失败:".socket_strerror ($socket)."<br>\n";$conn = socket_connect ($socket, $ip, $port);       // 建立SOCKET的连接if ($conn)    echo "成功连接到[".$ip.":".$port."]<br>\n";else    echo "socket_connect() 失败:".socket_strerror ($conn)."<br>\n";echo socket_read ($socket, 1024)."<br>";$stdin = fopen ('php://stdin', 'r');$ar = array("HELLO","HELP","test","QUIT");$i = 0;while (true){//    $command = trim (fgets ($stdin, 1024));//    socket_write ($socket, $command, strlen ($command));echo "发送 $ar[$i]<br>";    socket_write ($socket, $ar[$i], strlen($ar[$i]));$i++;    $msg = trim (socket_read ($socket, 1024));    echo "收到:$msg<br>\n";    if ($msg == "Bye-Bye")        break;}fclose ($stdin);socket_close ($socket);