This assumes you already have a web server (such as an HTTPD or Nginx web server) configured to produce PHP web pages. If not, check out my article on linking together an Nginx and PHP container running on Docker. In this scenario, your Nginx conf file could look something like this.

server {
    listen       80;
    server_name  stage.example.com;
    root         /var/www/html;
    index        index.html index.php;

    location / {
        try_files $uri $uri/ /index.php;
    }

    location ~ \.php$ {
      root           html;
      fastcgi_pass   10.5.14.3:9000;
      fastcgi_index  index.php;
      fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
      include        fastcgi_params;
    }
}

By default, the .php extension will show in a web browsers address bar. For example, if you've a page named About.php, the address bar will show www.example.com/About.php.

Update the try_files directive in your main location block in your nginx.conf file to have @extensionless-php.

location / {
    try_files $uri $uri/ @extensionless-php;
}

Also add an @extensionless-php location block and restart nginx for this change to take effect.

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

Now, .php will no longer be displayed.