Parsing Linux Nginx Cannot parse Php method ____linux

When using PHP in NGINX+PHP-FPM mode, if the problem of accessing the PHP file with file not found can be solved by the following method

Comment The root out and modify the Fastcgi_param to Script_filename $document _root$fastcgi_script_name;

Location ~ \.php$ {
            #root             html;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            #fastcgi_param   Script_filename  /scripts$fastcgi_script_name;
            fastcgi_param  script_filename  $document _root$fastcgi_script_name;
            include         Fastcgi_params;
       }