Smart Invoice System 1.9.2

[theresa]

thanks to dear member @theresa submitted a new resource:

Smart Invoice System - a simple and powerful web app based on PHP CodeIgniter framework manage invoices.

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customer relationship management (CRM) is a simple and powerful web app based on PHP CodeIgniter framework manage invoices.
Smart invoice System is customer relationship management (CRM) since version 1.8

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[l1admin689]

Tested:
Most of pages was support PHP8.it was include Hight CODE quality
maybe request to edit less code for PHP8.0+