The different behavior of the function uasort in PHP 5.5 and PHP 7.0

Question

I encountered a strange behavior of Magento 1.8 after changing php version from 5.5 to 7.0. This strange behavior is due to a change in the work function uasort

Answer 1

Possible Solution

I've created a magento module to solve magento issues with totals calculation for php7. The issues I've experienced in particular were that taxes have been added twice to the grand total for pay with amazon module on the amazonpayments checkout page.

Credits

The solution was provided by archigrafix on https://magento.stackexchange.com/a/97107/35665 solved my issues - so this is simply the fix packed into a module.

Module:

https://github.com/hartmut-ltd/magento-php7-totals-fix