Actually, that's a mod for PHP Nuke and not for Xcart. You might be able to modify the code to suit your purposes but Im not sure how easy that would be.
You might have better luck searching for "PHP site counter" or something similar on Google. Im quite sure you will generate many relevant results.
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Site 1 > XCART LIVE 3.4.12
Site 2 > XCART LIVE 4.0.17
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