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.

Ensure your /etc/nginx/nginx.conf file has the following.

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

location ~ \.php$ {
    try_files $uri =404;
    fastcgi_pass 127.0.0.1:9000;
    fastcgi_param SCRIPT_FILENAME  $document_root$fastcgi_script_name;
    include fastcgi_params;
}

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

Now, .php will no longer be displayed.