获取用户真实ip地址

<?php
//获取用户内网IP（局域网子网IP）
function getIp(){
$onlineip='';
if(getenv('HTTP_CLIENT_IP')&&strcasecmp(getenv('HTTP_CLIENT_IP'),'unknown')){
$onlineip=getenv('HTTP_CLIENT_IP');
} elseif(getenv('HTTP_X_FORWARDED_FOR')&&strcasecmp(getenv('HTTP_X_FORWARDED_FOR'),'unknown')){
$onlineip=getenv('HTTP_X_FORWARDED_FOR');
} elseif(getenv('REMOTE_ADDR')&&strcasecmp(getenv('REMOTE_ADDR'),'unknown')){
$onlineip=getenv('REMOTE_ADDR');
} elseif(isset($_SERVER['REMOTE_ADDR'])&&$_SERVER['REMOTE_ADDR']&&strcasecmp($_SERVER['REMOTE_ADDR'],'unknown')){
$onlineip=$_SERVER['REMOTE_ADDR'];
}
return $onlineip;
}
$ip=getIp();
echo '

---

';
//获取的是公网IP
function getClientIp(){
$socket = socket_create(AF_INET, SOCK_STREAM, 6);
$ret = socket_connect($socket,'ns1.dnspod.net',6666);
$buf = socket_read($socket, 16);
socket_close($socket);
return $buf;
}
$pub_ip=getClientIp();
echo $pub_ip;