PHPExcel get column name relative to given column

Question

Using PHPExcel, is it possible to get the name of a column located X number of columns to the left or right?

Example, given column BZ, I'd like to return column name CB or BX. (2 to the right or left)

Thanks

Answer 1

There are functions already built into PHPExcel to help you do this

$adjustment = -2;
$currentColumn = 'BZ';

$columnIndex = PHPExcel_Cell::columnIndexFromString($currentColumn);
$adjustedColumnIndex = $columnIndex + $adjustment;
$adjustedColumn = PHPExcel_Cell::stringFromColumnIndex($adjustedColumnIndex - 1);

Note the (historic) discrepancy that columnIndexFromString() will return a 1 for column A, but that stringFromColumnIndex expects a 0 to correspond to column A