How can the error "FPDF error: Some data has already been output, can't send PDF file" be prevented when working with PDF files in PHP?

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

<?php
ob_start(); // Start output buffering

// Your PDF generation code here

ob_end_clean(); // Clean the output buffer without sending it to the browser

// Output the PDF file

Keywords

FPDF output buffering ob_start ob_end_clean header

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