用php得到163的邮件信息

<?
$host='pop.163.com';
$port=110;
$user='******';
$password='******';

if(!($sock=fsockopen(gethostbyname($host),$port,$errno,$errstr)))
        exit($errno.': '.$errstr);
set_socket_blocking($sock,true);

$msg=fgets($sock);
echo $msg;

$command="user ".$user."\r\n";
fwrite($sock,$command);
$msg=fgets($sock);
echo $msg;

$command="pass ".$password."\r\n";
fwrite($sock,$command);
$msg=fgets($sock);
echo $msg;

$command="stat\r\n";
fwrite($sock,$command);
$msg=fgets($sock);
echo $msg;

$command="list\r\n";
fwrite($sock,$command);
while(true)
{
        $msg=fgets($sock);       
        echo $msg;
        if(preg_match('/^\./',$msg))
                break;
}

$command="retr 1\r\n";
fwrite($sock,$command);
while(true)
{
        $msg=fgets($sock);
        echo $msg;
        if(preg_match('/^\.(\r\n)$/',$msg))
                break;
}

$command="quit\r\n";
fwrite($sock,$command);
$msg=fgets($sock);
echo $msg;
?>