For my Education Only - Passing PHP Variables (or Fresh Variables) to Extensions

I have tried to pass PHP Variables to an extension I am writing, but have been unsuccessful.

For example, let’s say I have a PHP variable:

“pass_this_var” => “whatever”,

In the extension I write:

<?php $whatever = ‘{pass_this_var}’; ?>

This returns {pass_this_var} and not the contents of the variable.

Am I right in assuming that this is because the extension has no way of parsing variables, or am I just not “getting” how to do this?

Thread Moved by Moderator

Edit: OK - I’m an Idiot -capital “I.” Here I am asking about PHP variables to be passed to a PHP routine - must be a gazillion ways. Forget I asked! Please?