获取用户IP

/**
     * @return array|mixed|string|string[]
     */
    public function getClientIP()
    {
        if (@$_SERVER["HTTP_ALI_CDN_REAL_IP"]) {
            $ip = $_SERVER["HTTP_ALI_CDN_REAL_IP"];
        } elseif (@$_SERVER["HTTP_X_FORWARDED_FOR"] ?: false) {
            $ips = explode(',', $_SERVER["HTTP_X_FORWARDED_FOR"]);
            $ip = $ips[0];
        } elseif (@$_SERVER["HTTP_CDN_SRC_IP"] ?: false) {
            $ip = $_SERVER["HTTP_CDN_SRC_IP"];
        } elseif (getenv('HTTP_CLIENT_IP')) {
            $ip = getenv('HTTP_CLIENT_IP');
        } 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'];
        }

        $ip = str_replace(['::ffff:', '[', ']'], ['', '', ''], $ip);
        return $ip;
    }