How can the "FPDF error: Some data has already been output, can't send PDF file" error be resolved in PHP?

The "FPDF error: Some data has already been output, can't send PDF file" error occurs when there is output sent to the browser before generating the PDF file, which interferes with the PDF file's header. To resolve this issue, you need to ensure that no output is sent to the browser before generating the PDF file. 

<?php
ob_start(); // Start output buffering
require('fpdf.php'); // Include FPDF library
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Hello World!');
ob_end_clean(); // Clean the output buffer
$pdf->Output();
?>

Keywords

FPDF error output PDF file resolve

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