PHP - How to use mPDF to merge PDFs

Question

I will start out by saying that I can generate PDFs just fine with mPDF, but for the life of me, I can\'t get it to merge an existing PDF with the PDF it just generated.

Answer 1

This code is work with mpdf 8.0.7 with php 7.4.

              Mfiles = array();

             //Multiple pdf store in Mfiles array with full path.               
             array_push($Mfiles,'/assets/'.$pdfname.'.pdf');

                            
             $Mpath = 'Give file path with have you need to merge all pdf';

             // after loop we start this code
              if($Mfiles) 
                {
                  $filesTotal = sizeof($Mfiles);
                  $fileNumber = 1;
                  
                  if (!file_exists($Mpath)) 
                  {
                      $handle = fopen($Mpath, 'w');
                      fclose($handle);
                  }
                  foreach ($Mfiles as $fileName) 
                  {
                    if (file_exists($fileName)) 
                    {
                      $pagesInFile = $pdf->SetSourceFile($fileName);
                      for ($i = 1; $i <= $pagesInFile; $i++) 
                      {
                        $tplId = $pdf->importPage($i);
                        $pdf->UseTemplate($tplId);
                        if (($fileNumber < $filesTotal) || ($i != $pagesInFile)) 
                        {
                            $pdf->WriteHTML('');
                        }
                      }
                    }
                    $fileNumber++;
                  }
                  $pdf->Output($Mpath);
                }