检出全新的thinkphp项目后：
第一步要做的事情是：composer install
第二步就是确认runtime文件夹是否有web用户的读写权限。

如果上述两步都做了，且html和txt等静态资源访问无忧，还是报500错误，一般就是public目录问题，操作如下：

# vim /usr/local/nginx/conf/fastcgi.conf

fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
fastcgi_param  QUERY_STRING       $query_string;
fastcgi_param  REQUEST_METHOD     $request_method;
fastcgi_param  CONTENT_TYPE       $content_type;
fastcgi_param  CONTENT_LENGTH     $content_length;

fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;
fastcgi_param  REQUEST_URI        $request_uri;
fastcgi_param  DOCUMENT_URI       $document_uri;
fastcgi_param  DOCUMENT_ROOT      $document_root;
fastcgi_param  SERVER_PROTOCOL    $server_protocol;
fastcgi_param  REQUEST_SCHEME     $scheme;
fastcgi_param  HTTPS              $https if_not_empty;

fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;

fastcgi_param  REMOTE_ADDR        $remote_addr;
fastcgi_param  REMOTE_PORT        $remote_port;
fastcgi_param  SERVER_ADDR        $server_addr;
fastcgi_param  SERVER_PORT        $server_port;
fastcgi_param  SERVER_NAME        $server_name;

# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param  REDIRECT_STATUS    200;
fastcgi_param PHP_ADMIN_VALUE "open_basedir=$document_root/../:/tmp/:/proc/";

找到：

fastcgi_param PHP_ADMIN_VALUE "open_basedir=$document_root/:/tmp/:/proc/";

修改为：

fastcgi_param PHP_ADMIN_VALUE "open_basedir=$document_root/../:/tmp/:/proc/";

最后，需要重启一下php-fpm和nginx

service php-fpm restart

service nginx restart

php8信号重启/usr/local/php81/sbin/php-fpm方法：
先找到进程号：ps aux|grep php-fpm
然后删除重启：kill -USR2 第一个进程号