Is it possible to apply a heading style (especially heading 3 as in excel 2007) and total style (as in excel 2007) in a cell in Excel 2007 using PHPExcel as shown in the following snippet?

I applied these styles after generating it (as can be seen in the Shipping Address, Billing Address and Total cells). Tried on Google for a long time but couldn’t find it therefore, I presumably believed that they might not be supported by PHPExcel. Is there a way to do so using PHPExcel?
Excel’s “Predefined styles” aren’t built into PHPExcel, although it wouldn’t be too difficult to emulate.
You can define a style array to replicate any of Excel’s predefined styles, and then use the applyFromArray() method to set a cell to that style.
All you need to do is work out the individual components of each pre-defined Excel style, and define the style array accordingly.