Multiple pages

[Maniraj-Webner]

I'm trying to add data to multiple pages, but it overwrites the data of another page.
Here is my code

$pdf = new \setasign\Fpdi\Fpdi();
$pdf->AddPage();
$pageCount = $pdf->setSourceFile('sample.pdf');

    for ($pageNo = 1; $pageNo <= $pageCount; $pageNo++) {
        // import a page
        $templateId = $pdf->importPage($pageNo);
        // get the size of the imported page
        $size = $pdf->getTemplateSize($templateId);
        // use the imported page
        $pdf->useTemplate($templateId);
  
        $pdf->SetFont('Helvetica');
        if($pageNo == 1){
            $pdf->SetXY(15, 15);
            $pdf->Write(8, 'A complete document imported with FPDI page1');
        }
        else if($pageNo == 2){
            $pdf->SetXY(20, 20);
            $pdf->Write(8, 'A complete document imported with FPDI page2');
       }
        
    }
    dd($pdf->Output());

[JanSlabon]

Simply move the $pdf->AddPage() call into the for-loop.
Actually you don't use $size. If this is intentionally you can remove the line, otherwise use it.