获取请求IP地址

if (!function_exists('get_server_ip')) {

    /**
     * 获取服务端IP地址
     * @return string 返回IP地址
     */
    function get_server_ip()
    {
        if (isset($_SERVER)) {
            if ($_SERVER['SERVER_ADDR']) {
                $server_ip = $_SERVER['SERVER_ADDR'];
            } else {
                $server_ip = $_SERVER['LOCAL_ADDR'];
            }
        } else {
            $server_ip = getenv('SERVER_ADDR');
        }
        return $server_ip;
    }
}

if (!function_exists('get_client_ip')) {

    /**
     * 获取客户端IP地址
     * @param int $type 返回类型 0 返回IP地址 1 返回IPV4地址数字
     * @param bool $adv 否进行高级模式获取（有可能被伪装）
     * @return mixed 返回IP
     */
    function get_client_ip($type = 0, $adv = false)
    {
        $type = $type ? 1 : 0;
        static $ip = null;
        if ($ip !== null) {
            return $ip[$type];
        }
        if ($adv) {
            if (isset($_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 = $_SERVER['REMOTE_ADDR'];
            }
        } elseif (isset($_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];
    }
}