代码:

---

if (getenv("HTTP_CLIENT_IP")) { 
    	$ip = getenv("HTTP_CLIENT_IP"); 
}else if(getenv("HTTP_X_FORWARDED_FOR")){ 
    	$ip = getenv("HTTP_X_FORWARDED_FOR"); 
}elseif(getenv("REMOTE_ADDR")) {
	$ip = getenv("REMOTE_ADDR");
}else {
	$ip = $HTTP_SERVER_VARS['REMOTE_ADDR'];
}

---