I am using FPDF library in PHP to generated PDFs. Please consider my following code which generates a PDF:

```
<?php
require("fpdf181/fpdf.php");
class PDF extends FPDF
{
    //Page header
    function Header()
    {

    }

    //Page footer
    function Footer()
    {

    }

}
$pdf = new PDF('P', 'mm', 'A4');
$pdf->AliasNbPages();
$pdf->AddPage();

$pdf->SetFont('Arial','U',14);
$pdf->MultiCell(90, 8, "Student Details", 0, 'L');

$pdf->SetFont('Arial','B',12);
$pdf->Cell(32, 8, "Username: ");
$pdf->SetFont('Arial','',12);
$pdf->Cell(10, 8, 'abc123', 0, 1);

$pdf->SetFont('Arial','B',12);
$pdf->Cell(32, 8, "Name: ");
$pdf->SetFont('Arial','',12);
$pdf->Cell(10, 8, 'John', 0, 1);

$pdf->SetFont('Arial','U',14);
$pdf->MultiCell(90, 8, "Parent Details", 0, 'L');

$pdf->SetFont('Arial','B',12);
$pdf->Cell(32, 8, "Name: ");
$pdf->SetFont('Arial','',12);
$pdf->Cell(10, 8, 'Mathew', 0, 1);

$pdf->SetFont('Arial','B',12);
$pdf->Cell(32, 8, "Occupation: ");
$pdf->SetFont('Arial','',12);
$pdf->Cell(10, 8, 'Businessman', 0, 1);

$pdf->Output();

?>

```

Now it generates a PDF which looks like this:

```
Student Details
Username: abc123
Name: John
Parent Details
Name: Mathew
Occupation: Businessman

```

But I need output like this:

```
Student Details            Parent Details
Username: abc123           Name: Mathew
Name: John                 Occupation: Businessman

```

What changes should I make in my code to achieve this kind of formatting?