PHPExcel setVisible(false) doesnt work - symfony

Question

I convert my Excel files existing in my hard disk to HTML table.
My "showAction" works great ! using PHPExcel 1.8, symfony 2.5 & PHP 5.3.13
I just want only the first 14 column displaying.
I've to do a Filter.
My ReadFilter class :
class MyReadFilter implements PHPExcel_Reader_IReadFilter {
public function __construct($fromColumn, $toColumn) {
$this->columns = array();
$toColumn++;
while ($fromColumn !== $toColumn) {
$this->columns[] = $fromColumn++;
}
}
public function readCell($column, $row, $worksheetName = '') {
if (in_array($column, $this->columns)) {
return true;
}
return false;
}
}
My showAction() function in my DefaultController :
public function showAction()
{
$ami = glob('path/to/directory.{xlsx,xls,xlsm,xlsm.ink}', GLOB_BRACE);
$filterSubset = new MyReadFilter('A', 'N');
$objReader = \PHPExcel_IOFactory::createReaderForFile($ami[0]);
$objReader->setReadFilter($filterSubset);
$objPHPExcel = $objReader->load($ami[0]);
$objPHPExcel->setActiveSheetIndex(0);
$writer = \PHPExcel_IOFactory::createWriter($objPHPExcel, "HTML");
$writer->generateStyles();
$writer->generateSheetData();
return $this->render('MyBundle:Default:testexcel.html.twig', array(
'excelHtml'=>$writer,
'stylesExcel'=>$writer,
));
}
The problem is, blanks columns('O','P','Q')
<td class="column14"> </td>
<td class="column15"> </td>
still dispaying..
Is there a way to fully hide them ?
HTML table result
Thanks a lot ! #Mark Baker