Prevent direct access to a php include file

Question

I have a php file which I will be using as exclusively as an include. Therefore I would like to throw an error instead of executing it when it\'s accessed directly by typing

Answer 1

i suggest that don't use of $_SERVER for security reasons .
You can use a variable like $root=true; in first file that included another one.
and use isset($root) in begin of second file that be included.