We have already a very simple system for converting *xls files into *arff .
I need a small update, to add an option.
Somebody who has experience in PHP, Symfony, cocur library for reading and writing *arff files and phpspreadsheet library for *xls documents is required.
More details in private.
P.S. We need to convert the "full_data" sheet from the *xls file (see the attached files)