Read, calculate, output from phpexcel class

1. Read from xls File on server 2. Get Inputvalues 3. Get results (formular) from further cells (calculating) 4. SAVE each user calculation temporarily in temp php-file It should be a small calculator that is getting values from inputfields. Then it should directly live calculate from xls file and give out output values at the end. Because only one Person can write to xls file at the same time, it should make a small temp php or txt file copy with input/output values. Of course it should be so flexible that it recognizes excel or odt file type (version) and each field could be used for input and output. Calculating should be done in background. The original xls File should not be saved or written to.