Stergere coloana din tabel

Salut !

Vreau sa sterg o coloana dintr-un tabel inainte de a fi salvat in format xlsx.

Deci daca coloana DEPTH nu contine valori, vreau sa o elimin, si apoi sa salvez tabelul in format xlsx.

Am incercat sa folosesc col_options, si display=>none, dar nu functioneaza.

Codul meu:

<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
include_once("xlsxwriter.class.php");
$writer = new XLSXWriter();

$date_for_excel = array(array(array("Cruise","Station","Type","yyyy-mm-ddThh:mm:ss.sss","Longitude [degrees_east]","Latitude [degrees_north]","EDMO_code","DEPTH","TIME_ISO8601","QV:SEADATANET","WC_TEMP [degC]","QV:SEADATANET"),
array("***TS","Constanta","B","1981-01-01T08:00:00","28.62859","44.2358","697","","1981-04-24T08:00:00.000","1","11.80","1"),
array("","","","","","","","","1981-04-24T09:00:00.000","1","13.25","1")));

foreach($date_for_excel as $file_data_rows_set)
{
# sheet cols names #
$writer->writeSheetRow('Sheet1', $file_data_rows_set[0]);
	

if(count($file_data_rows_set) > 0)
{
for($i = 1; $i < count($file_data_rows_set); $i++)
{

$writer->writeSheetRow('Sheet1',$file_data_rows_set[$i]);
}

# Append empty row #
$writer->writeSheetRow('Sheet1',array_fill(0, count($file_data_rows_set[0]), ''));
}
}
$writer->writeToFile('rez.xlsx'); //inainte de linia asta, ar trebui eliminata coloana DEPTH ( daca nu are valori)

?>

Trebuie sa folosesc alta biblioteca , ca sa pot sterge coloana ?

Am rezolvat problema asa:

foreach($date_for_excel as $key=>$file_data_rows_set)
{
if(count($file_data_rows_set) > 0)
{
  for($i = 1; $i < count($file_data_rows_set); $i++)
  {
	if($file_data_rows_set[$i][7]=="") {unset($date_for_excel[$key][$i][7]);unset($date_for_excel[$key][0][7]);}
				 
  }
 
 
}
}