Issue:
When using the FPDF library in PHP, the following error is encountered: "FPDF error: Some data has already been output, can't send PDF."
Analysis:
This error occurs when FPDF detects any output prior to the PDF generation process. FPDF strictly requires the absence of any extraneous output to prevent potential conflicts. This includes leading or trailing spaces, comments, or any other non-PDF content.
Solution:
To resolve this issue, ensure that the FPDF library is the first and only output generated by your PHP script. This means eliminating any leading spaces or other extraneous content before the FPDF code block.
<?php $pdf = new FPDF(); $pdf->AddPage(); $pdf->SetFont('Arial', 'B', 16); $pdf->Cell(40, 10, 'Hello World!'); $pdf->Output(); ?>
Additional Recommendations:
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