phpExcel create writer from file

Suppose I have a file named abc.xls

I have some values in some columns in that file with macro's and formulas.

How can I add some more values to that file using phpExcel. without losing the macro's and formulas in开发者_StackOverflow社区 it?

Like for example I want to set the value of the cell A5 as the string "Testing".

Please help.

You can't. PHPExcel cannot handle macros, although you should have no problems with formulae unless they use UDFs. Try using COM, or PUNA instead