Automate converting excel xls file to excel xml

I have a web page where a user can upload xls files. When he uploads a file, i want to automate converting the excel file to excel xml. I want to convert it to an xml file as i think 开发者_如何学Goit will be easy to handle the data. Is it possible to write my own php function to do that?

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Let me see if I understand. You're going to read a XLS file, write it out as XLSX, then read in the XLSX?

Why not just deal with the XLS in the first place?