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I have an excel spreadsheet that contains some formulas to calculate ROI for an upcoming product of a client. Is it possible to convert this into a php script whereby a user would type into some boxes and then submit it working out the same. The excel spreadsheet is here: http://www.solidcamxpress.co.uk/roi.xls
You can use PHPExcel to read an existing spreadsheet and extract its data/formulas, but converting those formulas from Excel syntax to PHP is rather non-trivial.
Unless you’re doing a generalized Excel->PHP converter, the time/effort required to write such a converter will be far greater than it would take you do analyze the one spreadsheet by hand and code up some PHP stuff to recreate it.