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'alignment' => [
'vertical' => \PhpOffice\PhpSpreadsheet\Style\Alignment::VERTICAL_CENTER,
'horizontal' => \PhpOffice\PhpSpreadsheet\Style\Alignment::HORIZONTAL_CENTER,
],
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$spreadsheet->getActiveSheet()->getStyle($cells)->getAlignment()->setHorizontal($align)
$spreadsheet->getActiveSheet()->getStyle($cells)->getAlignment()->setVertical($align);