Calling PHPExcel's native methods

It's possible to call all native PHPExcel methods on the $excel and $sheet objects.

Calling Workbook methods

Example:

// Get default style for this workbook
$excel->getDefaultStyle();

Calling worksheet methods

Example:

// Protect cells
$sheet->protectCells('A1', $password);

Head over to PHPOffice to learn more about the native methods.