URL Rewrite to Remove .php in my Nginx PHP-FPM – SEO

I setup Nginx PHP-FPM, with Centos 7, and Virtualmin control panel. I want to have all pages a SEO Friendly link without .php.

System automatically create configuration : etc/nginx/nginx.conf

And empty folder: etc/nginx/conf.d/

nginx.conf :

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  _;
        root         /usr/share/nginx/html;


        # Load configuration files for the default server block.
          include /etc/nginx/default.d/*.conf;

           location / {
           }

        #error_page 404 /404.html;
           location = /40x.html{
       }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }         
    }




# Settings for a TLS enabled server.
#
#    server {
#        listen       443 ssl http2 default_server;
#        listen       [::]:443 ssl http2 default_server;
#        server_name  _;
#        root         /usr/share/nginx/html;
#
#        ssl_certificate "/etc/pki/nginx/server.crt";
#        ssl_certificate_key "/etc/pki/nginx/private/server.key";
#        ssl_session_cache shared:SSL:1m;
#        ssl_session_timeout  10m;
#        ssl_ciphers HIGH:!aNULL:!MD5;
#        ssl_prefer_server_ciphers on;
#
#        # Load configuration files for the default server block.
#        include /etc/nginx/default.d/*.conf;
#
#        location / {
#        }
#
#        error_page 404 /404.html;
#            location = /40x.html {
#        }
#
#        error_page 500 502 503 504 /50x.html;
#            location = /50x.html {
#        }
#    }

    server_names_hash_bucket_size 128;
    server {
        server_name mydomain.com www.mydomain.com;
        listen My.Domain.IP.Address;
        root /home/mydomain/public_html;
        index index.html index.htm index.php;        
        access_log /var/log/virtualmin/mydomain.com_access_log;
        error_log /var/log/virtualmin/mydomain.com_error_log;       
        fastcgi_param GATEWAY_INTERFACE CGI/1.1;
        fastcgi_param SERVER_SOFTWARE nginx;
        fastcgi_param QUERY_STRING $query_string;
        fastcgi_param REQUEST_METHOD $request_method;
        fastcgi_param CONTENT_TYPE $content_type;
        fastcgi_param CONTENT_LENGTH $content_length;
        fastcgi_param SCRIPT_FILENAME /home/mydomain/public_html$fastcgi_script_name;
        fastcgi_param SCRIPT_NAME $fastcgi_script_name;
        fastcgi_param REQUEST_URI $request_uri;
        fastcgi_param DOCUMENT_URI $document_uri;
        fastcgi_param DOCUMENT_ROOT /home/mydomain/public_html;
        fastcgi_param SERVER_PROTOCOL $server_protocol;
        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;
        fastcgi_param HTTPS $https;
        location ~ .php$ {
            try_files $uri =404;
            fastcgi_pass localhost:8000;
        }
        listen My.Domain.IP.Address:443 default ssl;
        ssl_certificate /home/mydomain/ssl.combined;
        ssl_certificate_key /home/mydomain/ssl.key;
        fastcgi_read_timeout 30;


    }


}

I found many information include the code below makes url working without .php
But after applying that, the page just shown 404 not found page.

location / {
    try_files $uri $uri.html $uri/ @extensionless-php;
    index index.html index.htm index.php;
}

location ~ .php$ {
    try_files $uri =404;
}

location @extensionless-php {
    rewrite ^(.*)$ $1.php last;
}

My question is, where should I insert the code above? what is completed code so it will work. May be I miss some parameter. If I must create a .conf file in etc/nginx/conf.d/ what is the complete code that i must put in the conf file?

Any help is much appreciated. (please note that My.Domain.IP.Address is replace with an IP address, and mydomain is a website domain name.).