ExcelAnt\Adapter\PhpExcel\Sheet\Sheet::getColumnWidth PHP Method

    public function getColumnWidth($index)
    {
        if (false === filter_var($index, FILTER_VALIDATE_INT)) {
            throw new \InvalidArgumentException("Index must be numeric");
        }
        return $this->phpExcelWorksheet->getColumnDimensionByColumn($index)->getWidth();
    }