修改为伪静态后，原来的含有index.php的URL地址被隐藏了，如果不做301跳转，不利于SEO搜索引擎收录，参考修改404.php如下：

<?php
$error_url = '//'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
$id = strstr($error_url, 'typecho/index.php/archives');    //截取以posts开始的字符串
if($id != "" ||$id != null){//判断是否不等于空或者null
    $str = substr($id,26);
    $id2 = substr($str,-1);
    if($id2 != '/'){
      header('HTTP/1.1 301 Moved Permanently'); //添加301状态码
      header("location://".$_SERVER['HTTP_HOST']."/typecho/archives".$str.".html");//跳转页面
    }  //https://ntnas.top:82/typecho
    elseif($id2 == '/'){
     $nameid = substr($str,0,-1);
      header('HTTP/1.1 301 Moved Permanently'); //添加301状态码
      header("location://".$_SERVER['HTTP_HOST']."/typecho/archives".$nameid.".html");//跳转页面
    }
}
?>

301跳转检测网站：
https://httpstatus.io/

参考链接：
https://cloud.tencent.com/developer/article/1609776?from=article.detail.1961797
https://baike.baidu.com/item/strstr/22372374)
https://baike.baidu.com/item/substr/10685875