获取客户端IP地址-----以及--------线上开启redis扩展

    /**

     * 获取客户端IP地址

     * @param integer $type 返回类型 0 返回IP地址 1 返回IPV4地址数字

     * @return mixed

     */

    function get_client_ip($type = 0) {

        $type       =  $type ? 1 : 0;

        static $ip  =   NULL;

        if ($ip !== NULL) return $ip[$type];

        if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {

            $arr    =   explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

            $pos    =   array_search('unknown',$arr);

            if(false !== $pos) unset($arr[$pos]);

            $ip     =   trim($arr[0]);

        }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {

            $ip     =   $_SERVER['HTTP_CLIENT_IP'];

        }elseif (isset($_SERVER['REMOTE_ADDR'])) {

            $ip     =   $_SERVER['REMOTE_ADDR'];

        }

        // IP地址合法验证

        $long = sprintf("%u",ip2long($ip));

        $ip   = $long ? array($ip, $long) : array('0.0.0.0', 0);

        return $ip[$type];

    }

线上开启redis扩展