php获取用户IPv4或IPv6地址的代码

<br><?php <br>function getIP() /*获取客户端IP*/ <br>{ <br>if (@$_SERVER["HTTP_X_FORWARDED_FOR"]) <br>$ip = $_SERVER["HTTP_X_FORWARDED_FOR"]; <br>else if (@$_SERVER["HTTP_CLIENT_IP"]) <br>$ip = $_SERVER["HTTP_CLIENT_IP"]; <br>else if (@$_SERVER["REMOTE_ADDR"]) <br>$ip = $_SERVER["REMOTE_ADDR"]; <br>else if (@getenv("HTTP_X_FORWARDED_FOR")) <br>$ip = getenv("HTTP_X_FORWARDED_FOR"); <br>else if (@getenv("HTTP_CLIENT_IP")) <br>$ip = getenv("HTTP_CLIENT_IP"); <br>else if (@getenv("REMOTE_ADDR")) <br>$ip = getenv("REMOTE_ADDR"); <br>else <br>$ip = "Unknown"; <br>return $ip; <br>} <br>?>