By default, PHP will tell the world what version of PHP you are using, e.g.
To fix this you can either change php.ini:
expose_php = off
Or change the header:
Or if you'd prefer a htaccess method:
Header unset X-Powered-By
If either of the above methods do not work, there is also the
header_remove() function that provides you the ability to remove the header:
If attackers know that you are using PHP and the version of PHP that you are using, it's easier for them to exploit your server.