Read Shipping Class in checkout_process.php

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I just wrote a code which produce an XML File in the checkout_process.php file. I need to convert the shipping code into a number, so i checked out the class file and made the following code, but it doesn't work proper. 

if ($shipping_modules->code = 'chp') {
	$transportMode = 0;
	}
if ($shipping_modules->$method = 'table') {
	$transportMode = 2;
	}

I got everytime the number 2 (or the last number) in my XML-File. What's wrong with that, how I get the codes of the shipping module? Can someone please give me a short clue...

Thanks,