title: Convert .xls file to xml using php
body: <p>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. <BR>
  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.</p>
  
  <p>Thanks. </p>