What are common issues with session transmission in PHP, specifically when generating PDF files?

Common issues with session transmission in PHP when generating PDF files include headers already being sent before the PDF content, resulting in a corrupted or incomplete PDF file. To solve this issue, you can use output buffering to capture the PDF content before sending any headers. 

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

// Generate PDF content here

$pdf_content = ob_get_clean(); // Get the buffered PDF content

// Send headers
header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="example.pdf"');

echo $pdf_content; // Output the PDF content

Keywords

session transmission PHP PDF files security

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