DISCUZ!1X 使用CDN后获取真实IP方法

        function _get_client_ip1() {
                $clientip = '';
                if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
                        $clientip = getenv('HTTP_CLIENT_IP');
                } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
                        $clientip = getenv('HTTP_X_FORWARDED_FOR');
                } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
                        $clientip = getenv('REMOTE_ADDR');
                } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
                        $clientip = $_SERVER['REMOTE_ADDR'];
                }
 
                preg_match("/[\d\.]{7,15}/", $clientip, $clientipmatches);
                $clientip = $clientipmatches[0] ? $clientipmatches[0] : 'unknown';
                return $clientip;
        }

复制代码
以下代码是在网上找到的，已经通过我的测试，请大家看看是否会出现其他问题。

function _get_client_ip()   
global $_SERVER;
if (isset($_SERVER["HTTP_X_FORWARDED_FOR"]))  
{
$realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
}
elseif (isset($_SERVER["HTTP_CLIENT_IP"]))  
{
$realip = $_SERVER["HTTP_CLIENT_IP"];
}
else  
{
$realip = $_SERVER["REMOTE_ADDR"];
}
return $realip;
}