Incompatible method signatures

[garethellis36]

Declaration of setasign\Fpdi\FpdfTplTrait::AddPage($orientation = '', $size = '', $rotation = 0) should be compatible with TCPDF::AddPage($orientation = '', $format = '', $keepmargins = false, $tocpage = false)

I want to use the commercial FPDI PDF parser from setasign. In order to do this, I have to use Fpdi2Driver and pass in an instance of Fpdi from setasign/fpdi:

$merger = new Merger(new Fpdi2Driver(new Fpdi()));

Fpdi extends FpdfTpl (both from setasign/fpdi)
FpdfTpl extends \FPDF
This library provides an alias of \FPDF which extends from TCPDF (tecnickcom/tcpdf).

Fpdi and TCPDF have incompatible method signatures on these methods:

Declaration of setasign\Fpdi\FpdfTplTrait::setPageFormat($size, $orientation) should be compatible with TCPDF::setPageFormat($format, $orientation = 'P')
Declaration of setasign\Fpdi\FpdfTplTrait::AddPage($orientation = '', $size = '', $rotation = 0) should be compatible with TCPDF::AddPage($orientation = '', $format = '', $keepmargins = false, $tocpage = false)
Declaration of setasign\Fpdi\FpdfTplTrait::Link($x, $y, $w, $h, $link) should be compatible with TCPDF::Link($x, $y, $w, $h, $link, $spaces = 0)
Declaration of setasign\Fpdi\FpdfTplTrait::SetDrawColor($r, $g = NULL, $b = NULL) should be compatible with TCPDF::SetDrawColor($col1 = 0, $col2 = -1, $col3 = -1, $col4 = -1, $ret = false, $name = '')

Probably others, I lost interest in manually fixing them just to get a different error message.

This generates a warning in PHP 7.4 and fatal errors in PHP 8.

[guianzollin]

Try something this:

composer.json

"iio/libmergepdf": "^4.0",
"tecnickcom/tcpdf": "6.3.*",
"setasign/fpdi": "^2.0"

Using Fpdi to sign a pdf

use setasign\Fpdi\Tcpdf\Fpdi;

...

$pdf = new Fpdi('P', 'mm', 'A4');
$pages = $pdf->setSourceFile('file.pdf');
$certificate = file_get_contents('certificate.crt');

for ($i = 1; $i <= $pages; $i++) {
    $pdf->AddPage();
    $page = $pdf->importPage($i);
    $pdf->useTemplate($page, 0, 0);
    $pdf->setSignature($certificate, $certificate, 'tcpdfdemo', '', 2, array());
}

$pdf->Output($path, 'F');

Using libmergepdf to merge two pdfs

use iio\libmergepdf\Merger;
use iio\libmergepdf\Driver\TcpdiDriver;

...

$merger = new Merger(new TcpdiDriver);
$merger->addFile('file1.pdf');
$merger->addFile('file2.pdf');
$mergedPdf = $merger->merge();

return $mergedPdf;