barcode128 dua kolom

<?php
require('code128.php');
$n=rand(3,10);
$pdf=new PDF_Code128();
$pdf->AddPage();
$pdf->SetFont('Arial','',10);
for($i=0;$i<$n;$i++){
    $code='2017-08-29_'.($i<9?'0'.$i:$i);
    $x=10+($i%2==0?90:0);
    $y=30*($i%2==0?$i/2:($i-1)/2);
    $pdf->Code128($x,20+$y,$code,80,20);
    $pdf->SetXY($x,45+$y);
    $pdf->Write(0,'copyright (c) by me : '.$code);
}
$pdf->Output();