If Possible to Read existing PDF content position and add the some content after over the existing content in laravel?

Laravel Package: "setasign/fpdi": "^2.3", "setasign/fpdf": "^1.8"

$pdf = new \setasign\Fpdi\Fpdi('L','mm','A4');
$pageCount = $pdf->setSourceFile(public_path().'/'.$url);
$pdf->setFont('Arial', 'B', 10);
for($i = 1; $i <= $pageCount; $i++){
    $tplIdx = $pdf->importPage($i);
    $pageDimensions = $pdf->getImportedPageSize($tplIdx);
    $pdf->addPage($pageDimensions['orientation'], $pageDimensions);
    $pdf->useTemplate($tplIdx);
 }

If It Possible read the content of the last page and get after page content ordinate of the current position. then Write new content without add new page or whitespaces

If Pdf Generate using DomPdf so you can generate HTML file using

$pdf->getDomPDF()->outputHtml()

Generated html file using DomPDF add some element like this:

<div id="divId"></div>

Then whenever you need to edit this document, you need to read the HTML file line by line and Edit document:

$url=public_path() .'/test.html';
$htmlFile='';
foreach(file($url) as  $key => $line){
  if(strpos($line, 'id="divId"') !== false){
    $line='<div>Hello world</div>';
  }
  $htmlFile.=$line;
}
$pdf = PDF::loadHTML($htmlFile)->setPaper('a4', 'landscape');
$pdf->output();