程序代码：

<?php 
error_reporting(E_ALL);
set_time_limit(0);
echo "<h2>TCP/IP Connection</h2>\n";

$service_port = 20122;
$address = "127.0.0.1";


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

echo "试图连接 '$address' 端口 '$service_port'...<br>";
$result = socket_connect($socket, $address, $service_port);
if ($result < 0)
{
echo "socket_connect() failed.\nReason: ($result) " . socket_strerror($result);
}
else
{
echo "连接OK<br>";
}

$out = '';
$out1='';
$in = "hello kitty!";

if(!socket_write($socket, $in, strlen($in)))
{
echo "socket_write() failed: reason: " . socket_strerror($socket) . "\n";
}
else
{
echo "发送到服务器信息成功！<br>";
echo "发送的内容为:<font color='pink'>$in</font> <br />";
}

$out = socket_read($socket, 1024);
echo "接收服务器回传信息成功！<br>";
echo "接受的内容为:".$out."<br />";
//socket_close($result);
echo "关闭SOCKET...<br>";
socket_close($socket);
echo "关闭OK<br>";
?>

程序代码：

<?php
//确保在连接客户端时不会超时

error_reporting (e_all);
// 设置运行时间
set_time_limit (0);
// 起用缓冲
ob_implicit_flush ();
//设置IP和端口号
$address='127.0.0.1';
$port=20122;    //调试的时候，可以多换端口来测试程序！
echo "start\n<br />";
$protocol = getprotobyname("tcp");
//创建一个SOCKET
$sock=socket_create(AF_INET,SOCK_STREAM,$protocol);
if($sock<0)
{
echo "socket_create() 失败的原因是:".socket_strerror($sock)."<br>";
}

//绑定到socket端口
if(($ret=socket_bind($sock,$address,$port))<0)
//if(!@socket_bind($sock,$address,$port))
{
echo "socket_bind() 失败的原因是:".socket_strerror($ret)."<br>";
}

//开始监听
if(($ret=socket_listen($sock))<0)
//if(!@socket_listen($sock))  //无效参数？？？
{
echo "socket_listen() 失败的原因是:".socket_strerror($ret)."<br>";
}

    if (($msgsock = socket_accept($sock)) < 0)
    {
    echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . "\n";
    break;
    }

//发到客户端
//$msg ="<font color=olive>you have send a message to client！</font><br />";
//socket_write($msgsock, $msg, strlen($msg));
$buf=$_POST['buf'];
socket_write($msgsock, $buf, strlen($buf));

echo "读取客户端发来的信息<br>";
$bufmsg = socket_read($msgsock,1024);
if($bufmsg==0){
echo "the string is empty<br />";
$bufmsg="not recieved<br />";
//break;
}

$talkback = "收到的信息:".$bufmsg."<br />";
echo $talkback."<br />";

echo "<br />message is :".$buf;
socket_close($msgsock);

socket_close($sock);
?>
<form action="server_01.php" method="post">
请选则发送方式：<br><input type=text name="buf">
<input type=submit name="submit" value="发送">
</form>