Hide X-Powered-By: PHP

As so much in our beautiful world of IT it's very easy:

1. Open your php.ini in the editor of your trust.
2. Find this line:

   ; Decides whether PHP may expose the fact that it is installed on the server
   ; (e.g. by adding its signature to the Web server header).  It is no security
   ; threat in any way, but it makes it possible to determine whether you use PHP
   ; on your server or not.
   expose_php = On

3. Change the On to an Off:

   expose_php = Off

4. Reload your Apache and the X-Powered-By: PHP header is gone.
   
   

Reference:

https://blogs.oracle.com/oswald/hide-x-powered-by:-php