Server-side includes in .php?

Is there a way to do simple server-side includes in a .php file similar to <!--#include virtual="header.txt" --> in .shtml?

include 'file.php';
or
require 'file.php';

In both cases it reads and executes the file, but include generates warnings in case of errors, whereas require generates fatal errors.

Well now, let's not get too simple. :p

Thanks, I'll try it out.

There is a difference between the two, although subtle...
include('file.txt') and require('file.txt') both include file.txt.
But if file.txt does not exist, require() will stop the php page execution, but include() only throws a warning and continues page execution.

Edit: oops, endless already said that...

I've tried both and see what you both mean.

Ahh, so simple yet so effective. This is exactly what I needed. Thanks a lot. :)