php 获取外网ip,请问下,用PHP获取浏览当前用户的公网IP地址,用什么方法啊?

public function ip($type = 0, $adv = true)

{

$type = $type ? 1 : 0;

static $ip = null;

if (null !== $ip) {

return $ip[$type];

}

if ($adv) {

if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {

$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

$pos = array_search('unknown', $arr);

if (false !== $pos) {

unset($arr[$pos]);

}

$ip = trim(current($arr));

} elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {

$ip = $_SERVER['HTTP_CLIENT_IP'];

} elseif (isset($_SERVER['REMOTE_ADDR'])) {

$ip = $_SERVER['REMOTE_ADDR'];

}

} elseif (isset($_SERVER['REMOTE_ADDR'])) {

$ip = $_SERVER['REMOTE_ADDR'];

}

// IP地址合法验证

$long = sprintf("%u", ip2long($ip));

$ip = $long ? [$ip, $long] : ['0.0.0.0', 0];

return $ip[$type];

}

直接拿去用