To test if PHP was installed successfully, Nginx error: "Primary script Unknown"

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Niche Q q:1770058260
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2. Environment
   php-5.6.36
   nginx-1.14.0
4. Problem
   Access PHP test file times 404 (file does not exist), has confirmed that the permissions and configuration are not a problem.
6. Processing process
   View Nginx error log: reported the following error (172.16.6.236 is the server)

   2018/08/03 01:05:34 [error] 57141#0: *242 FastCGI sent in stderr: "Primary script unknown" while readingresponse header from upstream, client: 172.16.6.237, server: localhost, request: "GET /test.php HTTP/1.1",upstream: "fastcgi://127.0.0.1:9000", host: "172.16.6.236"

8. Resolution process
   In the Nginx official website to see if there are similar errors, found no, and then Baidu .... (Laugh and Cry)
   The solution is as follows,
   Will:#fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
   Modified to:fastcgi_param 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;    }

   Explain:$document_root 就是nginx配置项“root”指定的位置参数的变量

To test if PHP was installed successfully, Nginx error: "Primary script Unknown"