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一开始对socket不太理解，做起东西很模糊，后来做过定位请求的项目，对socket的理解更清楚了。
贴一下示例代码：

SERVER端

<?php
//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='127.0.0.1';
$port=2009;    //调试的时候，可以多换端口来测试程序！

//创建一个SOCKET
if(($sock=socket_create(AF_INET,SOCK_STREAM,SOL_TCP))<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)
{

echo "socket_bind() 失败的原因是:".socket_strerror($ret)."<br>";
}

//开始监听
if(($ret=socket_listen($sock,4))<0)
{

echo "socket_listen() 失败的原因是:".socket_strerror($ret)."<br>";
}

do {

if (($msgsock = socket_accept($sock)) < 0)
{

echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . "\n";
break;
}

//发到客户端
$msg ="<font color=red>欢迎进入服务器！</font><br>";
socket_write($msgsock, $msg, strlen($msg));

echo "读取客户端发来的信息<br>";
$buf = socket_read($msgsock,8192);


$talkback = "收到的信息:$buf<br>";
echo $talkback;
/* if(socket_write($msgsock, $talkback, strlen($talkback))<0)
     {

      echo "socket_write() failed: reason: " . socket_strerror($msgsock) . "\n";
     }
     else
     {

      echo "发送成功";
     }*/


//echo $buf;
socket_close($msgsock);
} while (true);

socket_close($sock);
?>




CLIENT端


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

$service_port = 2009;
$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.\n";
}

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) . "\n";
}
else
{

echo "连接OK<br>";
}

$in = "Hello\r\n";
$in .= "我是Chester\r\n";
$out = '';
$out1='';


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='red'>$in</font> <br>";
}

while($out = socket_read($socket, 8192))
{

echo "接收服务器回传信息成功！<br>";
echo "接受的内容为:",$out;
}


echo "关闭SOCKET...<br>";
socket_close($socket);
echo "关闭OK<br>";
?>
先运行server.php

再运行client.php

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