Creating groups of numbering pages in fPDF/tfPDF

Question

I am using this add on which helps me create different groups of pages. I have 2 major problems. First I am using PHP 7.3 and I don't want to use an older version of PHP because I have other code that is working with PHP 7.3. First problem comes on line 33 file - pagegroup.php:

$n = sizeof($this->PageGroups) + 1;

I am getting error

sizeof(): Parameter must be an array or an object that implements Countable

I tried to change this line with those code:

if (empty($this->PageGroups)) {
    $n = 1;
} else {
    $n = count($this->PageGroups)+1;
}

Can someone confirm me this is working fine, because my second problem is when I put this code:

require 'lib/pagegroup.php';

class MYPDF extends PDF_PageGroup {
    function Header() {
        $this->Cell(0, 6, 'Page '.$this->GroupPageNo().'/'.$this->PageGroupAlias(), 0, 0, 'C');
    }

    for ($i = 0; $i < 2; $i++) {

    $pdf->StartPageGroup();
    $pdf->AddPage();

    // some other code ...
    }
}

GroupPageNo is working great, but PageGroupAlias is returning {nb1} and for group page 2 it is returning {nb2}. So I end up having 1/{nb1} and 1/{nb2} and the final result should be 1/1 and 1/1 for example.

Answer 1

I manage to make it work under PHP 7.3. This is my working code inside method _beginpage I changed this line:

$n = sizeof($this->PageGroups)+1;

With those lines:

if (empty($this->PageGroups)) {
    $n = 1;
} else {
    $n = count($this->PageGroups) + 1;
}

Other most important thing is that it had to be set the font family to Arial other way it was not working and it was showing {nb2}. So it should be something like that.

require 'lib/pagegroup.php';

class MYPDF extends PDF_PageGroup {
    function Header() {
        $this->AddFont('DejaVuSans', '', 'DejaVuSans.ttf', true);
        $this->SetFont('Arial', '', 10);
        $this->Cell(0, 6, 'Page '.$this->GroupPageNo().'/'.$this->PageGroupAlias(), 0, 0, 'C');
        // change the font to the one you want to use in my case DajaVu
        $this->SetFont('DejaVuSans', '', 16);
    }

    for ($i = 0; $i < 2; $i++) {

    $pdf->StartPageGroup();
    $pdf->AddPage();

    // some other code ...
    }
}