[N版技术问答]设置了子目录，目录下的PHP无法解析，直接提示下载

server {
        listen       80;
        server_name  localhost 127.0.0.1;
         
        root   D:/upupw/htdocs;
        index  index.html index.htm index.php;
         
        location ~ /longphp {
            root D:/mycode;
        }
         
        location ~ ^.+\.php {
            fastcgi_pass   bakend;
            fastcgi_index  index.php;
            fastcgi_split_path_info ^((?U).+\.php)(/?.+)$;
            fastcgi_param  PATH_INFO $fastcgi_path_info;
            fastcgi_param  PATH_TRANSLATED $document_root$fastcgi_path_info;
            include        fastcgi.conf;
        }
         
        error_log logs/aaa.log debug;
    }