PHP的IP地址获取代码

    function GetIP(){ 
        if (getenv(“HTTP_CLIENT_IP”) && strcasecmp(getenv(“HTTP_CLIENT_IP”), “unknown”)) 
            $ip = getenv(“HTTP_CLIENT_IP”); 
        else if (getenv(“HTTP_X_FORWARDED_FOR”) && strcasecmp(getenv(“HTTP_X_FORWARDED_FOR”), “unknown”)) 
            $ip = getenv(“HTTP_X_FORWARDED_FOR”); 
        else if (getenv(“REMOTE_ADDR”) && strcasecmp(getenv(“REMOTE_ADDR”), “unknown”)) 
            $ip = getenv(“REMOTE_ADDR”); 
        else if (isset($_SERVER[‘REMOTE_ADDR’]) && $_SERVER[‘REMOTE_ADDR’] && strcasecmp($_SERVER[‘REMOTE_ADDR’], “unknown”)) 
            $ip = $_SERVER[‘REMOTE_ADDR’]; 
        else 
            $ip = “unknown”; 
        return($ip); 
    }