1、/xiunophp/xiunophp.min.php 第20行

$get_magic_quotes_gpc = get_magic_quotes_gpc();

改成

$get_magic_quotes_gpc = 0;

2、/xiunophp/xiunophp.php 第20行

$get_magic_quotes_gpc = get_magic_quotes_gpc();

改成

$get_magic_quotes_gpc = 0;

3、/xiunophp/xn_html_safe.func.php 第785行、第938行、第951行

把这三行的

rawtext{}

大括号{}改为中括号[]，PHP高版本数组不再支持大括号{}。
实测PHP7.4和PHP8.0可以正常使用。

解决php8.1下http_url_path报错方法：

xiunophp/misc.func.php文件大约1034行

源代码：

// 获取 http://xxx.com/path/
function http_url_path() {
	$port = _SERVER("SERVER_PORT");
	//$portadd = ($port == 80 ? "" : ":".$port);
	$host = _SERVER("HTTP_HOST");  // host 里包含 port
	$https = strtolower(_SERVER("HTTPS", "off"));
	$proto = strtolower(_SERVER("HTTP_X_FORWARDED_PROTO"));
	$path = substr($_SERVER["PHP_SELF"], 0, strrpos($_SERVER["PHP_SELF"], "/"));
	$http = (($port == 443) || $proto == "https" || ($https && $https != "off")) ? "https" : "http";
	return  "$http://$host$path/";
}

更改后：

// 获取 http://xxx.com/path/
function http_url_path() {
	$port = _SERVER("SERVER_PORT");
	//$portadd = ($port == 80 ? "" : ":".$port);
	$host = _SERVER("HTTP_HOST");  // host 里包含 port
	$https = strtolower(_SERVER("HTTPS", "off"));
	$proto = _SERVER("HTTP_X_FORWARDED_PROTO") ? strtolower(_SERVER("HTTP_X_FORWARDED_PROTO")) : ""; //此处加判断
	$path = substr($_SERVER["PHP_SELF"], 0, strrpos($_SERVER["PHP_SELF"], "/"));
	$http = (($port == 443) || $proto == "https" || ($https && $https != "off")) ? "https" : "http";
	return  "$http://$host$path/";
}