Batch printing PDF files with laravel - laravel

Question

I have a program that can print an individual PDF when on a students file. I'm doing this using niklasravnsborg/laravel-pdf package in Laravel 5.7. It's working great because I can just stream the pdf from a view into the browser then print from there.
Now I'm wanting to batch print the PDF's at the end of the day instead of one by one. How can I do this? There's no documentation for this on the package repository.
Several ways I've thought of doing this: one, save each PDF as an image file then try to print all files in that folder at the end of the day. If I do this, how would I print all files in that folder?
Next: does anyone know a way to maybe append a new PDF to a variable containing all the previously looped pdf's?
For example:
$finalpdf;
$students = Student::all();
foreach($students as $student){
$pdf = PDF::loadView('pdf.document', $student);
$finalpdf .+ $pdf; //i know this line doesn't work, but how to alter it?
return $pdf->save('document.pdf');
}

Answer 1

After a few days of playing around, hopefully this solution helps someone in the future. I used another package called "lara pdf merger". By writing my files to a save destination, adding those files to a merged file, then deleting the saved files after download, I was able to get my functionality. This is my controller code:
use PDF;
use Illuminate\Filesystem\Filesystem;
use LynX39\LaraPdfMerger\Facades\PdfMerger;
public function batchPrint(){
$pdfMerger = PDFMerger::init();
$i = 0;
$students = Student::whereDate('updated_at', Carbon::today('America/Los_Angeles'))->get();
foreach ($students as $student) {
$pdf = PDF::loadView('printTables', compact('student'));
$pdf->save('pdf/document'.$i.'.pdf');
$pdfMerger->addPDF('pdf/document'.$i.'.pdf');
$i++;
}
$pdfMerger->merge();
$pdfMerger->save("file_name.pdf", "browser");
$file = new Filesystem;
$file->cleanDirectory('pdf');
}