PHP Get visitor IP address

获取访问者IP地址

[PHP]代码

static public 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
        {
            $ip = "";
        }
        return($ip);
    }

PHP