What is the common error message "FPDF error: Some data has already been output" in PHP and how can it be resolved?

The common error message "FPDF error: Some data has already been output" in PHP occurs when there is output being sent to the browser before FPDF can generate a PDF file. This can be resolved by ensuring that there is no output (such as HTML, whitespace, or error messages) before calling the FPDF functions to generate the PDF. 

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

// FPDF code to generate PDF file

ob_end_clean(); // Clean the output buffer

Keywords

FPDF error message data output resolution PHP

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