I need to implement a functionality where a user can upload an Excel file, that is, .xls file and i need to write a function that will read that file and then save the values in a table, compare them to values in another table and then print some kind of billing quotation.
From what I have read, it seems that the best way to do that is to first convert that file to an xml file and then write a function to parse that xml file. I want to know, is it possible to write a function in php that will convert an xls file to xml. Assuming that the users will save and upload the file as xls.

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