请问php里怎么得到访客的ip和端口号
function getip(){
if (isset($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"])&&$HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"]){
$ip = $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"];
} elseif(isset($HTTP_SERVER_VARS["HTTP_CLIENT_IP"])&&$HTTP_SERVER_VARS["HTTP_CLIENT_IP"]){
$ip = $HTTP_SERVER_VARS["HTTP_CLIENT_IP"];
} elseif(isset($HTTP_SERVER_VARS["REMOTE_ADDR"])&&$HTTP_SERVER_VARS["REMOTE_ADDR"]) {
$ip = $HTTP_SERVER_VARS["REMOTE_ADDR"];
} elseif (getenv("HTTP_X_FORWARDED_FOR")) {
$ip = getenv("HTTP_X_FORWARDED_FOR");
} elseif (getenv("HTTP_CLIENT_IP")) {
$ip = getenv("HTTP_CLIENT_IP");
} elseif (getenv("REMOTE_ADDR")) {
$ip = getenv("REMOTE_ADDR");
} else {
$ip="Unknown";
}
return $ip;
}