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$pdf->mediabox($name)
$pdf->mediabox($w, $h)
$pdf->mediabox($llx, $lly, $urx, $ury)

    $pdf = PDF::API2->new();
    $pdf->mediabox('A4');
...
    $pdf->mediabox(0, 0, 595, 842);
    ...
    $pdf->saveas('our/new.pdf');