Define 2 Header in one Sheed is not possible

Hi, i tryed to Create this kind of Excel Sheed

FB | Anzahl 1 | 5 2 | 7

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Summe 12

If i try to use the Header Funktion for the first line everything is fine

$header1 = array( 'FB'=>'integer','Anzahl'=>'integer'); $Mappe1 = 'Professoren'; $writer->writeSheetHeader($Mappe1, $header1); Then comes the Data (numers) output At the end of the line i wanted to ad a total (Summe).

$prof_summe = array( 'Summe',$alle_daten_prof_fb_summe[0]['Summe'] ); $writer->writeSheetRow( $Mappe1, $prof_summe);

But this creates an error because 'Summe' is an text Field and it is in the Colum 'FB'. In the head statement i defined the Colum 'FB' as integer.

So try to define a second Head for the $Mappe1 but this creates an other error. There is a solution without the Head statemend but i wanted to us it because of the Filter possibilities.

Dou you have a soulution for me?