PHPExcel calculateWorksheetDimension of a csv file

Question

I use PHPExcel to import data from a .csv file which has the same rows and columns with a excel file. Basically I open them with LibreOffice and they look the same. However there are two result when calculating theirs worksheet dimensions.

1. csv: A1:A10
2. xlsx: A1: AMK10

I just want to ask that it is always like that due to the different formats or I do something wrong?

$pi = pathinfo($filePath);
  switch ($pi['extension']) {
    case 'xls':
      $reader = PHPExcel_IOFactory::createReader('Excel5');
      break;
    case 'xlsx':
      $reader = PHPExcel_IOFactory::createReader('Excel2007');
      break;
    case 'csv':
      $reader = PHPExcel_IOFactory::createReader('CSV');
      break;
    default:
      return array();
  }
  $phpexcel = $reader->load($filePath);
  $sheet = $phpexcel->getActiveSheet();
  $sheet->calculateWorksheetDimension();

Answer 1

When loading a CSV file, if the delimiter isn't a default comma ( , ) then you need to explicitly set the delimiter for the reader. eg

PHPExcel_IOFactory::createReader('CSV'); 
$reader->setDelimiter(';');