In what scenarios might including external files or performing database queries in PHP code contribute to output-related errors when generating PDF files?

Including external files or performing database queries in PHP code can contribute to output-related errors when generating PDF files because these actions can introduce unexpected characters or output that disrupt the PDF generation process. To solve this issue, it is recommended to separate the logic for including external files or performing database queries from the code responsible for generating the PDF file. This can be achieved by storing the necessary data in variables before initiating the PDF generation process. 

<?php
// Perform database query and store data in variables
$databaseResult = fetchDataFromDatabase();

// Include external file and store content in a variable
ob_start();
include 'externalFile.php';
$externalFileContent = ob_get_clean();

// Generate PDF using stored data
$pdf = new PDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10, $databaseResult);
$pdf->Cell(40,10, $externalFileContent);
$pdf->Output();
?>

Keywords

PHP external files database queries PDF files output errors

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