Accessing function file on another domanin

From: Mike Harvey (spam_at_spam.com)
Date: 10/27/04 

Date: Wed, 27 Oct 2004 17:05:24 GMT

I want to be able to access the functions located in a file on site A
from site B without the person who owns site B being able to see the
code in the function.

Examples:

This works:
<?PHP
include_once("http://site_a.com/function_file.inc");
echo my_function();
?>
However, simply going to http://site_a.com/function_file.inc in a
browser will show you the code that makes the function work.

This doesn't work:
<?PHP
include_once("http://site_a.com/function_file.inc.php");
echo my_function();
?>
Calling http://site_a.com/function_file.inc.php directly with a
browser will not give you anythin - which is what I want. However,
anything that the above called file actually "does" works but any
functions declared in it are not available to the code that called it.

Any ideas?

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