getClientIP.php

function getClientIP()  
{  
    global $ip;  
    if (getenv("HTTP_CLIENT_IP"))  
        $ip = getenv("HTTP_CLIENT_IP");  
    else if(getenv("HTTP_X_FORWARDED_FOR"))  
        $ip = getenv("HTTP_X_FORWARDED_FOR");  
    else if(getenv("REMOTE_ADDR"))  
        $ip = getenv("REMOTE_ADDR");  
    else $ip = "Unknow";  
    return $ip;  
}