Export a PDF document under PHP 7.1

Hi everyone,

I have been using maatwebsite/excel to generate PDFs from data in our database. It worked great until I upgraded to PHP 7.1, now I receive the following error: ErrorException: A non-numeric value encountered in /home/forge/cvahimt.org/vendor/phpoffice/phpexcel/Classes/PHPExcel/Cell.php:835

It is my understanding that this is an issue with phpoffice/phpexcel.

Can anyone suggest an alternative to maatwebsite/excel with good documentation?

Here is my code to give you an idea of my current needs. Data is fetched by a helper class, should not be relevant. (Sorry if the syntax highlighting isn't working, not sure why):

$entriesObj = new personnelSpreadsheetEntry($users);
        \Excel::create('CVAHIMT-personnel-export-' . date("m-d-Y"),
            function ($excel) use ($entriesObj) {
                $excel->sheet('Personnel Listing', function ($sheet) use ($entriesObj) {
                    $sheet->setOrientation('landscape');
                    $sheet->fromArray($entriesObj->generateContactSheet());
                    $sheet->row(1, function ($row) {
                        $row->setFontWeight('bold');
                        $row->setBackground('#f2e296');
                    });
                    $sheet->setAutoFilter();
                    $sheet->setFreeze('C2');
                });
                $excel->sheet('Emergency Contacts', function($sheet) use ($entriesObj) {
                    $sheet->setOrientation('landscape');
                    $sheet->fromArray($entriesObj->generateEmergencyContacts());
                    $sheet->row(1, function ($row) {
                        $row->setFontWeight('bold');
                        $row->setBackground('#f2e296');
                    });
                    $sheet->setAutoFilter();
                    $sheet->setFreeze('C2');
                });
                $excel->getDefaultStyle()
                    ->getAlignment()
                    ->setHorizontal(\PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
                $excel->setActiveSheetIndex(0);
            })->export("xls");