Preventing execution without inclusion

[Adam Hubscher <webmaster@xxxxxxxxxxxxxxxx>]

From within the application, I use one page to include 
classes/variables and so on. Is there a way (I may have been missing it 
in the documentation for PHP, however I didnt see anything related) to 
prevent a user from directly accessing/executing *.php by the file 
making sure taht it was only included by index.php?

For example:

config.php defines:

function __autoload($class_name) {
	
	$class_name = strtolower($class_name);
	include_once('class.'.$class_name.'.php');
}

as per PHP5 example

1 (the preferred way): user accesses 
http://www.example.org/index.php?function=Join, this loads the class 
NewUser and begins its implementation. Because of the __autoload, it 
includes class.join.php, in order to utilize the class.

2 (the wrong way): user accesses 
http://www.example.org/includes/class.join.php without going through 
index.php.

I am trying to prevent 2 from even occuring, utilizing a piece of code 
that would check if index.php had included it, or not. This code would 
be in the beginning of all the class files, at the top, before any other 
 code was to be executed.

As of yet, it has eluded me...

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