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.

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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