Randomly broken PDF's within batch processing

[StefanNeuser]

Describe the bug
As soon as we generate more than 1000 PDFs by using PDF::loadView, it starts randomly breaking the PDF design (starts overlapping)

To Reproduce
Steps to reproduce the behavior:

• Laravel 10 and Package Version v2.2.0

return Pdf::loadView($invoice->templateView(), [
    'invoice' => $invoice,
    'shop' => $invoice->shop,
    'withoutLogo' => $this->withoutLogo,
    'template' => $invoice->templateData($invoice->order),
]);

Expected behavior (works for the i.e. first 1000 pdfs)

Issue

Additional context
When a create i.e. 1000 PDF's with php artisan queue:work --queue=export **--max-jobs=1** --memory=4000 --timeout=3600 step by step (process for process) it's working fine. Without --max-jobs=1 the same issue appears. Same issue when we process the jobs with horizon with a job chunk size of 1000

$jobs = [];
foreach ($this->invoices()->chunk(1000) as $invoiceIds)
{
    $jobs[] = new ExportInvoicesChunkJob($this->shop, $invoiceIds->values());
}

if (empty($jobs))
{
    logger("no invoices for export available");
    return;
}

// zipped und schreibt den export eintrag in die datenbank
$jobs[] = new ExportInvoicesFinishJob($this->shop, $this->params['range']);

Bus::chain($jobs)->catch(function (Throwable $e)
{
    logger($e->getMessage());
})->onQueue('export')->dispatch();

I guess it has something todo with Laravel view / caching system. Maybe the cache but i already tries to drop the cache each 100 PDF's.

We appreciate any help 🙏

[bsweeney]

This could have something to do with a kludge that was put in place to prevent infinite loops (see https://github.com/dompdf/dompdf/blob/v3.1.0/src/LineBox.php#L157).

At some point for a near-term release of Dompdf, I plan to review static usage since there are a few places where static values can be problematic.

[StefanNeuser]

Hi @bsweeney , thank you very much for that interesting hint! Do you have any idea how to change it for a test? My thoughts was to move the method prop

static $anti_infinite_loop = 10000; // FIXME smelly hack

to a static class property and reset it as soon a we render a new PDF here

public function output(array $options = []): string
{
    if (!$this->rendered) {
        $this->render();
    }

\Dompdf\LineBox::$anti_infinite_loop = 10000;
    
return (string) $this->dompdf->output($options);
}

EDIT: With that (Hack) it's working now.