I am making a php project..its made with container with multiple include/require functions (including php pages).

I need that if visitor has a cookie (from my site) he sees different include, or include is visible only if visitor has cookie in his comp...

Cookie will be made with loging in...

If someone has any idea to make this more elegant please help.

If you're using PHP 5, check out the autoload feature.

Are you looking for another way or are you asking if thats the best way to do it. I see nothing wrong with setting a cookie on login and then with php checking if the cookie is set and including or not including a file. You'll want to have some form of verification on the cookie though because I personally edit my cookies all the time to see what I can get away with on others sites.