How can the setleftmargin and setrightmargin functions in fpdf be effectively utilized for custom document layouts?

To create custom document layouts using fpdf, the setleftmargin and setrightmargin functions can be utilized to adjust the margins of the document. By setting these margins, you can control the positioning of text, images, and other elements within the document, allowing for a more customized layout.

<?php
require('fpdf.php');

class PDF extends FPDF {
    function Header() {
        $this->SetLeftMargin(20);
        $this->SetRightMargin(20);
        $this->Cell(0, 10, 'Custom Document Layout', 0, 1, 'C');
    }
}

$pdf = new PDF();
$pdf->AddPage();
$pdf->SetFont('Arial', '', 12);
$pdf->Cell(0, 10, 'This is a custom document layout with adjusted margins.', 0, 1);

$pdf->Output();
?>