PHP function Returne correct IP address even if user is behind proxy

 

/**

     * Returne string correct IP address even if user is behind proxy

     * @return string correct IP address even if user is behind proxy

     * @return type

     */

    public static function getIP() { 

        if (getenv('HTTP_CLIENT_IP')) { 

            $ip = getenv('HTTP_CLIENT_IP'); 

        } 

        elseif (getenv('HTTP_X_FORWARDED_FOR')) { 

            $ip = getenv('HTTP_X_FORWARDED_FOR'); 

        } 

        elseif (getenv('HTTP_X_FORWARDED')) { 

            $ip = getenv('HTTP_X_FORWARDED'); 

        } 

        elseif (getenv('HTTP_FORWARDED_FOR')) { 

            $ip = getenv('HTTP_FORWARDED_FOR'); 

        } 

        elseif (getenv('HTTP_FORWARDED')) { 

            $ip = getenv('HTTP_FORWARDED'); 

        } 

        else { 

            $ip = $_SERVER['REMOTE_ADDR']; 

        } 

        return $ip; 

    }