Pull cart order total on non WHMCS page?

Hello everyone,

I'm working on my new website and have added a image in the header which is displayed when on the cart or on all pages (even non-WHMCS pages) if 1 or more items are in the cart.

Does anyone have/know of any PHP code which can be used to pull the order total for use on WHMCS and non-WHMCS pages?

Thanks,
Jack