Cell Padding is an HTML concept and there is nothing like it in Excel. How would you set cell filling in MS Excel itself?
Probably the best thing you can do is adjust the height and width of the cell.
EDIT
I searched for this, and even Microsoft said that in Excel there is no equivalent to filling cells. It seems that the best option is to use cell alignment indents (combined with column width) for horizontal padding; height and vertical vertical alignment. They can be installed in PHPExcel.
Mark baker
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